Browsing by Author "Dr. Lubna Sherin"

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Amino Acid Based MOF: A Promising Green Material for Electrochemical Sensing of Heavy Metal Ions (HMIs)
(Library Information Services, COMSATS University Islamabad, Lahore Campus, 2025) Hooria Aslam; CIIT/SP24-R06-008/LHR; Dr. Lubna Sherin; LHR TP 10017
Heavy metal ion (HMI) contamination in freshwater resources has become a serious environmental and public health concern worldwide. Toxic metals such as lead (Pb) and mercury (Hg) can accumulate in living organisms and pose significant health risks due to their persistence and non-biodegradable nature. Therefore, the development of efficient and sensitive methods for the detection of HMIs in water is essential before its utilization for domestic, agricultural, and industrial purposes. This study presents the synthesis of an amino acid-based Metal–Organic Framework (MOF) as a green and effective material for electrochemical sensing of heavy metal ions. An energy-efficient microwave-assisted synthesis method was employed to prepare a MOF using bismuth and cobalt as central metal ions and L-tyrosine as the organic linker. L-tyrosine, a naturally occurring and biocompatible amino acid, was selected to enhance the environmental sustainability of the synthesized material. Microwave synthesis offers several advantages, including reduced reaction time, lower energy consumption, high product yield, and minimal environmental impact. The synthesized MOF exhibited excellent surface characteristics suitable for sensing applications. The incorporation of the ionic liquid BMIM BF₄ significantly improved the electrical conductivity, increased the availability of adsorption sites for heavy metal ions, and enhanced the sensing performance of the material. The developed electrochemical sensing platform demonstrated a large active surface area, efficient charge transfer capability, enhanced conductivity, and good operational stability. The structural and physicochemical properties of the synthesized composite were characterized using Fourier Transform Infrared Spectroscopy (FTIR) and X-ray Diffraction (XRD) techniques. Furthermore, the electrochemical performance of the MOF-based electrode (L-Tyr-BiCo/IL/GCE) was evaluated through cyclic voltammetry and electrochemical impedance spectroscopy. The results indicate that the developed amino acid-based MOF is a promising green material for the sensitive and reliable detection of heavy metal ions in aqueous environments
Biomolecule loaded Chitosan Based Photo Curable Hydrogel for Cartilage Regeneration
(Library Information Services COMSATS University Islamabad Lahore Campus, 2020-02-19) Muzna Maryam; FA18-R06-002; Dr. Lubna Sherin; LHR TP 6488
Cartilage injuries such as osteochondritis and osteoarthritis are common in Pakistan. Polymeric hydrogels are widely used in such medical conditions for the cartilage regeneration. This research aims at the synthesis of hydrogels with high tensile strength by incorporating natural polymers such as chitosan and poly vinyl alcohol. In this project synthetic hydrogels were prepared by using natural biopolymers. Initially Hydrogels were prepared using different concentration of chitosan and poly vinyl alcohol. Once these Hydrogels were prepared they undergoes different structural and biological testing techniques. Fourier transform infrared spectroscopy (FTIR) confirmed the presence of functional groups chitosan and poly vinyl alcohol. Then drug release studies were carried out in order to observe the release of drug from the hydrogel. Then anti-bacterial studies were performed against the gram positive bacteria Staphylococcus aureus. Cytotoxicity analysis was performed in order to claim that these hydrogels had no toxic effect on the cells. All these experiments confirmed that the said hydrogels are safe to use for the biomedical applications.
Design and Synthesis of Novel Electrochemical Sensing Platform for Water Remediation
(Library Information Services, COMSATS University Islamabad, Lahore Campus, 2025) Muhammad Abdullah Hashmi; SP23-R06-026; Dr. Lubna Sherin; LHR TP 9473
Heavy metal ions (HMIs) contamination of fresh water bodies has raised concern all over the world. Among HMIs, arsenic (As), lead (Pb) and mercury (Hg) are toxic and chronic to human health due to their bioaccumulation and non-degradability. Sensitive detection of these water bodies is very much necessary before utilization. Electrochemical sensing may be proved to be sensitive detection platform for HMIs detection. Herein, MOF of L glutamic acid as linker and copper as central metal ion was prepared by energy efficient microwave method. Glutamic acid is naturally available, biocompatible amino acid. Microwave production provide energy efficient, stable heating rate, lower reaction time, high yield and less environmental pollution method for MOF preparation. Excellent surface properties shown by as prepared MOF. Conductivity of MOF, adsorption sites for HMIs and potential window for sensing platform have enhanced by incorporating Ionic liquid (EMIM TFSI) with MOF. Therefore as prepared MOF (L-glu-cu)/IL composite exhibited high active surface area, good charge transfer rate, enhanced conductivity and stability over time for sensitive electrochemical detection of HMIs. Synthesized composite was characterized by XRD and FTIR. Electrochemical behavior of MOF (L glu-cu)/IL@GCE was identified by cyclic voltammetry (CV) and electrochemical impedance spectroscopy (EIS). Square wave voltammetry (SWV) was used for detection of arsenic (As), lead (Pb) and mercury (Hg). Results demonstrated that linear detection range and lower limits of detection (LOD) for these three HMIs individually and simultaneously. Obtained limit of detection (LOD) for As (III), Pb (II) and Hg (II) were 2.69ngL-1, 2.201ngL-1 and 3.323ngL-1 respectively.
Designing and Fabrication of MOF Based Electrochemical Sensor for Potential Application in Environmental Remediation2025
(2025) Arfa Tahir CIIT/FA23-R06-006/LHR; Dr. Lubna Sherin; lHR TP 9684
Contamination of fresh water bodies by heavy metal ions (HMIs) has been a concern across the world. Due to its bioaccumulation and non-degradability, lead (Pb) and mercury (Hg) are some of the HMIs which are toxic and chronic to human health. Identification of these water bodies prior to utilization is important. In detection of HMIs, electrochemical sensing may be proved to be a sensitive detection platform. In this case, an energy-efficient microwave method was applied to synthesize MOF of copper as the central metal ion and L-aspartic acid and Benzene tricarboxylic acid as the linkers. Aspartic acid is a biocompatible amino acid that is found naturally. In the synthesis of MOFs, microwave manufacturing provides a technique that is environmentally less polluting, stable in heat rate, low in reaction time, and high in yield. Good surface properties are exhibited by the MOF as synthesized. Ionic Liquid (EMIM TFSI) addition to MOF has enhanced its conductivity, HMI adsorption sites, and possible sensing platform window. Therefore, for electrochemical sensitive detection of HMIs, the synthesized MOF (L-asp-BTC-cu)/IL composite exhibited large active surface area, excellent charge transfer rate, enhanced conductivity, and time stability. FTIR and XRD were applied to study the synthesized composite. Cyclic voltammetry (CV) and electrochemical impedance spectroscopy (EIS) were employed to identify the electrochemical response of MOF (L-asp-BTC-cu)/IL/GCE. Mercury (Hg) and lead (Pb) were quantified by square wave voltammetry (SWV). Results indicated that the lower limits of detection (LOD) and linear detection range for each of these three HMIs separately and in combination. Obtained limit of detection (LOD) for Pb (II) and Hg (II) were 0.17μM, and 0.36μM respectively.
Fabrication of MOF@MXene Based Electrochemical Sensor for Sensitive Detection of Environmental Pollutant
(Library Information Services, COMSATS University Islamabad, Lahore Campus., 2025-04-01) Sehrish Javed; CIIT/FA23-R06-022/LHR; Dr. Lubna Sherin; LHR TP 9694
Heavy metallic ions (HMIs) are some of the riskiest environmental pollutants because they're non-biodegradable, very poisonous, and have the tendency to bioaccumulate in residing organisms. Their incidence in water supplies is an extreme risk to human fitness and ecosystems. (Bi-S)n MOF@MXene composite was synthesized for sensitive detection of HMIs in aqueous media. The (Bi-S)n MOF was prepared through a microwave method using bismuth nitrate pentahydrate and 6,6-dithiodinicotinic acid. Using a combination of LiF and HCl, the aluminum layer from the MAX phase was selectively etched to create MXene. (Bi-S)n MOF and MXene were acquired to prepare a hybrid composite, which were solidified on a GCE. The conductivity, adsorption capacity, and sensing range of MOF were all enhanced by MXene. FTIR, XRD, CV, and EIS characterization approaches validated the structural integrity and excellent electrochemical behavior of the composite. The sensor indicated extremely excessive sensitivity with detection limits (LODs) of 1.9233 nM, 2.0927 nM and 2.2104 nM for Pb²⁺ Cu²⁺ and Hg²⁺ in single detection. During co-detection, modest LOD expanded of Pb²⁺, Cu²⁺and Hg²⁺ have been noticed due to competition among the ions.
Fabrication of Nanocomposite-based Sensor for Selective Detection of Heavy Metal Ion in Aqueous Media
(Library Information Services, COMSATS University Islamabad, Lahore Campus, 2025) Jazba Rosheen; SP23-R06-011; Dr. Lubna Sherin; LHR TP 9460
Heavy metals contamination is a severe quality concern in many fast-growing cities, because maintenance of water quality and sanitation infrastructure were not increased with population and urbanization growth especially for the developing countries. Lead (Pb²⁺) and Mercury (Hg²⁺), in water pose enormous environmental and health issues that make it imperative to produce an efficient detection method. SU-101 MOF@Ppy NWs is a conducting nanocomposite material composed of Bismuth metal with ellagic acid as a linker, fabricated with the help of the novel microwave-assisted methodology, in this research study. Before testing the conductivity of this nanocomposite, FTIR analysis was done appropriately to ensure the structural reliability and purity of the obtained compounds. Electrochemical studies, including CV and EIS, demonstrated enhanced conductivity of the SU-101 MOF@PpyNWs nanocomposite. Square Wave Voltammetry further proved it to be a promising detection material for Lead and Mercury, suggesting its importance as a heavy metal ion detector in aqueous media. The Limit of Detection calculated was 2.026ng/L and 2.184ng/L for Pb2+ and Hg2+ respectively.
Formulation of Cartilage Regeneration Patches Using Hyaluronic Acid Beads
(Library Information Services COMSATS University Islamabad Lahore Campus, 2020-02-20) Fatima Noor; FA18-R06-023; Dr. Lubna Sherin; LHR TP 6501
Hydrogels have regenerative behavior therefore they are widely used as injectable scaffolds in tissue engineering. Chitosan is a well-known biomaterial which is extensively used in tissue engineering. Chitosan membranes were fabricated in different compositions by freeze-gelation of mixture of chitosan impregnated with beads of collagen/alginate. Collagen was used to improve the biocompatibility of scaffolds. FTIR was used to observe the distribution of constituent materials used in the scaffolds. Swelling and degradation studies showed good equilibrium ratio in PBS solution. The mechanical strength of these scaffolds matches with the mechanical strength of natural tissues. These results showed that collagen/alginate scaffolds could be potential candidate for tissue engineering. These results encourage the use of chitosan scaffolds and significance of collagen/alginate scaffolds for regenerating tissues and organs
Green Synthesis of Silver Nanocomposites from Powders of Various Medicinal Plants and Study of their Antimicrobial Potential
(Library Information Services COMSATS University Islamabad Lahore Campus, 2020-02-17) Hira Ashfaq; FA18-R06-003; Dr. Lubna Sherin; LHR TP 5960
The application of plant waste materials in the synthesis of nanomaterials is an efficient and inexpensive method to minimize the practice of expensive chemicals. It is because of the reason that it gives rise to green approaches that abstain from the addition of toxic chemicals into the environment. The research work focuses on the synthesis of silver nanocomposites using powders of various therapeutically reported plants and the study of their potential regdaring chromium metal decontamination. For characterization, the techniques of X-ray Diffraction XRD and Fourier Transform Infrared Spectroscopy FT-IR has been used. Waste water treatment is performed for adsorptiove removal of chromium. Optimization is carried out using batch methods for various parameters like, pH, adsorbent dose and time of contact. Isothermal and kinetics study have shown that removal of chromium using silver nanocomposite was a feasible process, following langmuir adsorption model and pseudo second order reaction kinetics.
Nanocomposite of Conductive Polymer Decorated with Metal / Metal Oxide as Electrochemical Sensing Probe for Phenolic Derivatives
(Library Information Services COMSATS University Islamabad Lahore Campus, 2020-02-20) Muhammad Tayyab; FA18-R06-007; Dr. Lubna Sherin; LHR TP 6490
The purpose of this research project is to modify the glassy carbon electrode (GCE) with copper polyaniline (Cu-PANI) to electrochemically detection of 4-aminophenol. Therefore, copper polyaniline (Cu-PANI) is synthesized through chemical oxidation polymerization, and then copper (Cu) is injected into the polyaniline. Copper nanoparticles interact with the mobile groups of polyanilines through electrostatic force (van der Waals force). Fourier transform infrared (FT-IR) studies confirmed the presence of functional groups in the synthesized nanocomposites, energy dispersive x-ray (EDX) confirmed the Cu doping into polyaniline and composition of nanocomposites, scanning electron microscope (SEM) confirmed the morphology of Polyaniline (PANI), and size of the Cu-PANI morphology. In cyclic voltammetry (CV), modified (Cu-PANI)/GCE electrode behaviour showed toward 4-AP was studied in the presence of supporting electrolyte (0.1 M H2SO4) with optimized potential window range (0.2 to 0.8 V) at 50mV/s scan rate. The electron transfer was the study of Cu-PANI/GCE at 0.52V oxidation peak and with different concentration as well. The qualitative technique differential pulse voltammetry (DPV) was performed to determine the linear response (5μM to 2mM) of 4-AP with lower limit detection is 10μM. The Cu-PANI/GCE showed sensitivity and selectivity for 4-AP and even in the presence of organic interference species. This improved electrode is cheap, robust, selective, and sensitive, and has an excellent volume to surface ratio. Therefore, the produced electrochemical sensor has good sample analyzer activity and is equally effective in analyzer sewage, tap-water, and industrial wastewater as well.
Photocatalytic Degradation of Organic Wastewater Pollutants by Green Photocatalyst
(Library Information Services COMSATS University Islamabad Lahore Campus, 2020-02-17) Rizwan Akbar; FA18-R06-016; Dr. Lubna Sherin; LHR TP 5965
Dyes present in industrial wastewater are harmful to humans as well as environment. They are non-biodegradable synthetic materials that are difficult to degrade naturally. At present the simplest, economical and ecofriendly method for dye degradation is application of metal oxides nanoparticles as photocatalyst. Fabrication of metal oxide nanoparticles by using safe and cheap natural products as reducing and capping agents is highly interesting field in material sciences. This research focuses on green synthesis of copper oxide nanoparticles (CuO NPS) by using propyl gallate as reducing, capping and stabilizing agent. It was confirmed and characterized by UV-visible spectroscopy, XRD crystallography and FTIR analysis. Synthesized nanoparticles was employed as photocatalyst for the degradation of various waste- water dyes and optimization of dye degradation was carried out for various parameters like, pH, temperature, and dye concentration. The results demonstrate that in comparison to methyl orange it was more efficient against methylene blue and congo red degradation with 93 % and 89% removal respectively in 120 minutes.
Study of Cellulose-Based Nanocomposite Sheets for Potential Application in Flexible Electronics
(Library Information Services COMSATS University Islamabad Lahore Campus, 2021-02-26) MUHAMMAD HABIB UR REHMAN; SP20-R06-017; Dr. Lubna Sherin; LHR TP 7571
Cellulose, an abundant, cheap and bio-compatible polymer have been widely used in writing and packaging for decades. In modern world it has found a vast range of high tech applications such as flexible electronics. It is anticipated that use of cellulose substrate in flexible electronics can reduced millions tons of electronic waste. In this work lemongrass leaves were used as cellulose source to prepare cellulose sheets. The characterization techniques such as FTIR and XRD were used to confirm that fabrication of cellulose substrate. The analysis on cellulose substrate was performed by using two conventionally used methods in electronics e.g., electro spraying of conductive ink and adhesive copper tape. Poly 3, 4-ethylenedioxythiophene: Poly styrene sulfonic acid (PSS: PEDOT) was used as conducting ink for electro-spraying. The substrate, electro-sprayed for 6 minutes and curred at 80 °C for 40 minutes, showed remarkable results. Comparison of substrate behavior was made between synthesized cellulose substrate and commercially used reference PET substrate by using adhesive copper tape. Current-voltage measurement were recorded for the conductance study. Results of cellulose substrates behavior similar to that of reference substrate show that it can be a potential candidate of eco-friendly substrate for electronics; addressing the need for biodegradable, cost-effective and environment friendly green electronics especially in the fabrication of recyclable microwave components and antennas.
Synthesis and Characterization of Functionalized Nano-cellulose Based Conducting Material
(Library Information Services COMSATS University Islamabad Lahore Campus, 2020-02-20) Noman Zafar; SP19-R06-006; Dr. Lubna Sherin; LHR TP 6510
Electrochemical sensing techniques are the advance techniques for the detection of water contamination. Conducting materials in electro-chemical sensors are based on graphene or carbon nano tubes (CNT) substrate mostly. Resent literature has documented the hazardous effects of graphene and carbon nanotubes (CNT). Moreover, use of these substrates enhances the cost of the sensor to a larger extend. Currently environment friendly and sustainable natural materials are replacing the toxic materials for the development of electro-chemical sensors. In this view current research work aims at the synthesis of conducting composite by incorporating eco-friendly and abundantly available natural material i.e. cellulose as a substrate. Initially nano-cellulose was synthesized and subsequently it was functionalized with polyaniline and nano metal oxides to enhance the conductivity. The synthesized nanocomposite was characterized through FTIR analysis. Conductance of the synthesized materials was checked and IV graphs were plotted. The results showed that conductance of nano composite was increased subsequently by the addition of different metals to NC/PANI composite.
Synthesis and Characterization of Metal Organic Framework based Nanostructured Composite for Environmental Application
(Library Information Services COMSATS University Islamabad Lahore Campus, 2023-02-27) Muhammad Ashraf; SP22-R06-022; Dr. Lubna Sherin; LHR TP 8661
It is difficult to develop reliable techniques for the quick detection of heavy metal ions and related chemical species in water. There are many different species of mercury in the environment, and these species bio-amplify and become methylated to become organo-Hg species. Using FeCoMOF/PANI-NH2 as the starting substrate, we created a novel electrochemical technique called differential pulse voltammetry (DPV) for the quick screening of free Hg+2 in water on a metal-organic framework (MOF) platform. Using bimetallic MOF structures incorporate on polyaniline surface that enhance the stability and conductivity of composite. To improve Hg 2 + detection performance, FeCoMOF/PANI-NH2 nanocomposites were added to the GCE. The conductivity and sensitivity of the FeCoMOF/PANI-NH2/GCE was higher than that of pure FeCoMOF/GCE. Because functionalized conductive polymers forms on FeCoMOF as a result of presence different metal nodes, electroanalytical performance is greatly enhanced. For the electrochemical detection of Hg+2, the GCE treated with FeCoMOF/PANI-NH2 nanocomposite demonstrated the greatest performance. Furthermore, the findings from the electrochemical impedance spectrum (EIS) and cyclic voltammetry (CV) tests verified that the FeCOMOF/PANI-NH2 increased the rate of electron transfer at the solid-liquid interface.
Synthesis and Characterization of Metal Oxide Decorated Nanocomposite for Photocatalytic Application
(Library Information Services COMSATS University Islamabad Lahore Campus, 2020-02-23) Rida Fatima Hussain; SP19-R06-017; Dr. Lubna Sherin; LHR TP 6520
Dyes present in industrial wastewater are harmful to humans as well as environment. They are non-biodegradable synthetic materials that are difficult to degrade naturally. At present the simplest, economical and ecofriendly method for dye degradation is application of metal oxides nanocomposite as photocatalyst. Fabrication of metal oxide nanocomposites by using safe and cheap natural products for photocatalytic degradation of dyes is highly interesting field in material sciences. This research focuses on synthesis of four different kinds of nanocomposite CoO/Agcl/FeO, CoO/Agcl/NiO, CoO/Agcl/CuO, CoO/Agcl/ZnO which further processed with sodium alginate and form nanocomposite beads. The synthesized nanocomposites beads were characterized by FTIR. Futhure more, synthesized nanocomposite beads were employed as photocatalyst for the degradation of model dye methyl orange . The degradation of model dye was recorded high for Iron/alginate nanocomposite beads(90% in 80 mins) as compared to other nanocomposite beads
Synthesis and Characterization of PANI@cellulose Nanocomposite based Electrochemical Sensor for Environmental Remediation
(Library Information Services COMSATS University Islamabad Lahore Campus, 2021-02-26) Nageen Shoukat; SP20-R06-010; Dr. Lubna Sherin; LHR TP 7564
In this work, porous CuO-NiO/CA/PANI@Ni-foam sensor electrode has been designed using electospinning of CA/PANI composite on Ni-foam and then drop casting of CuO-NiO nanoparticles for detection of bisphenol A (BPA). 3D nickel foam has been chosen as electrode substrate for the direct growth of CA/PANI since Ni-foam has the advantages of excellent electrical conductivity, low cost, commercial availability, and porous structure, which provides large surface area for synthesis of nanofibers. This direct grown structure of CuO-NiO/CA/PANI@Ni-foam provides exceptional properties, such as reduced resistance, good electron transport, better adhesion stability and the excellent electrical conductivity as compared with non-direct synthesized electrode. Furthermore, a synergetic effect between CuO-NiO/CA/PANI and Ni-foam substrate enables the electrode for excellent sensing behavior towards BPA. The resultant CuO-NiO/CA/PANI@Ni-foam was analyzed using Fourier transform infrared spectroscopy, X-ray diffraction, Raman spectroscopy and scanning electron microscopy. Different electrochemical methods such as cyclic voltammetry, electrochemical impedance and differential pulse voltammetry were used for evaluation of synthesized sensor’s performance against BPA. Under optimal conditions, a linear response was observed against BPA and very low limit of detection as well (LOD=0.6uM). The CuO-NiO/CA/PANI@Ni-foam electrode demonstrated high reproducibility, consistency, and stability when used to detect BPA in water. The synthesized sensor's results demonstrated that it was extremely selective for the detection of BPA, suggesting that it could be useful in environmental based surveillances.
Synthesis and Electrochemical Characterization of Nanocomposite with Graphene Enforcement for the Detection of Heavy Metal Ion in Water
(Library Information Services COMSATS University Lahore Campus, 2023-03-13) Muhadsa Zahra; SP22-R06-001; Dr. Lubna Sherin; LHR TP 8640
Arsenic, one of nature's most prevalent environmental toxins, was found to be exceedingly abundant in the Earth's mantle during this thesis. Arsenic can manifest in various oxidation states (-3, 0, +3, and +5), with arsenite (As3+) being particularly toxic in natural water and surface soil. The extended presence of arsenic in these environments posed a significant risk to human well-being. Recognizing the critical importance of an effective sensing technique for the detection of As3+ ions, this study aimed to safeguard human health and well-being while preserving a beautiful and healthy biosphere. The advantages of electrochemical sensing, such as easy instrumentation, high sensitivity, strong selectivity, mobility, and on-site analysis capability, were considered. A Nanocomposite Cu-Fe/GA@NS-rGO was synthesized to detect very low levels of As3+ in water and achieve sensitivity up to 0.7 nM. The morphological and physicochemical characteristics of the synthesized material were investigated through Fourier-transform infrared spectroscopy (FTIR) and X-ray diffraction (XRD). The electrochemical behavior of the Pencil graphite electrode (PGE) modified with Cu-Fe/GA@NS-rGO was examined using cyclic voltammetry (CV) and electrochemical impedance spectroscopy (EIS). It was demonstrated that, with the Cu-Fe/GA@NS-rGO/PGE, As3+ could be sensed via differential pulse voltammetry (DPV). As the concentration increased from 10 to 80 nM, a substantial linear response was achieved, with a limit of detection of 0.7 nM. The remarkable sensitivity of the Cu-Fe/GA@NS-rGO-modified PGE underscored its electroanalytical capabilities, suggesting its practical applicability in its as-prepared state for real-world scenarios
Synthesis of Cellulose based Nanocomposite for the Potential Application in Electrochemical Sensor
(Library Information Services COMSATS University Islamabad Lahore Campus, 2023-02-27) Muhammad Junaid Talib Awan; FA21-R06-003; Dr. Lubna Sherin; LHR TP 8639
High surface area, structural flexibility, and the ability to selectively detect metal ions have all contributed to the rise of metal-organic frameworks (MOFs) as a class of useful materials for sensing applications. With the goal of detecting metal ions, this thesis explores the synthesis, characterization, and use of a composite material made of Cu-CA MOF, polyaniline (PANI), and expanded graphite (EG). The fundamental goal of this research is to investigate how incorporating Cu-CA MOF, PANI, and EG into a composite material can increase its sensitivity to metal ions. The Cu-CA MOF serves as a very porous support material, allowing the PANI and EG to be distributed throughout the composite. PANI, a conductive polymer, adds electrical conductivity and more sites for attaching metal ions, while EG, a conductive network, boosts electron transport and sensor performance in general. The synthesis of the Cu-CA MOF/PANI/EG composite material is a multi-step process that begins with the fabrication of Cu-CA MOF and continues with the integration of PANI and EG. X-ray diffraction (XRD), Fourier-transform infrared spectroscopy (FTIR), and electrochemical analysis are all used to characterize the resultant composite. By exposing the Cu-CA MOF/PANI/EG composite to silver metal ions, we can gauge its sensing performance. The composite material and metal ions interact, leading to changes in electrical conductivity or other quantifiable signals, which are used as the sensing mechanism. The composite's selectivity, sensitivity, and response time are studied for a variety of metal ions and compared to those of established sensing materials. The findings show that the Cu-CA MOF/PANI/EG composite has great sensing capacities for silver metal ions, with good sensitivity and selectivity. The composite material has shown encouraging results in detecting silver metal ions. We also test the composite's durability, reusability, and performance in complex sample matrices to see if it has any practical uses.structural flexibility
Synthesis of green nanocomposite based electrochemical sensor for the detection of water pollutant
(Library Information Services COMSATS University Islamabad Lahore Campus, 2021-02-23) Farah Kausar; FA19-R06-031; Dr. Lubna Sherin; LHR TP 7335
Electrochemical sensing techniques are considered to be highly efficient towards the detection of water pollutants. Most of these conventional electrochemical sensors utilize graphene and carbon nanotubes as a conducting material. But recent researches have documented several adverse impacts of these materials such as their toxicity, effect on ecosystem by various diseases and also their use make the sensor more costly. For the development of electro-chemical sensors, environmentally benign and sustainable natural materials are currently replacing harmful materials. In this regard this research work aims to synthesize the green nanocomposite based electrochemical sensor for the detection of water pollutants. Nano cellulose is used as a substrate. Nano cellulose was first synthesized by acid hydrolysis method. Further it was fabricated with polyaniline through in situ polymerization and metal oxide nanocomposite was incorporated in it. The synthesized composites were characterized by FTIR and XRD for structural evaluation. The electrochemical analysis of the synthesized composites was performed. The obtained analytical results of electrochemical impedance spectroscopy (EIS) suggest that both the synthesized composites (CoO/AgCl/NiO/PANI/nanocellulose and CoO/AgCl/CuO/PANI/nanocellulose) are conductive in nature. To check the sensing behavior of the synthesized composites against metal ions cyclic voltammetry was performed. Cyclic voltamogram of CoO/AgCl/NiO/PANI/nanocellulose was found to be efficient against the Pb+2 and Cd+2 ions with the limit of detection 0.5 and 0.14 mM/L respectively. Cyclic voltamogram of CoO/AgCl/CuO/PANI/nanocellulose was also obtained against Pb+2 and Cd+2 ions having better results than the bare GCE. The results suggest that modified electrodes are better conductor and have good sensitivity which can be applied for real sample analysis as electrochemical sensors.
Synthesis of MOF@Ppy Nanocomposite as Electrochemical Sensing Platform for Pollutant Detection
(Library Information Services, COMSATS University Islamabad, Lahore Campus, 2026) Saira Nasir; CIIT/SP24-R06-026/LHR; Dr. Lubna Sherin; LHR TP 10029
Since the infrastructure for the management of water quality and sanitation could not support the rising numbers due to the growing population and urbanization, especially in emerging countries, the problem associated with higher metal levels becomes an important issue in water quality in most cities that are growing very quickly. An effective way for the detection of Pb²⁺ and Hg²⁺ in water, which are hazardous to the environment and human health, becomes very important. Co-Zr-CAU-28@Ppy is a conductive nanocomposite with the structure consisting of the linker molecule ‘2,5-furan dicarboxylic acid.’ Zirconium tetrachloride and cobalt nitrate hexahydrate are the metal ions. This study employs an innovative method for the preparation of the compound through the use of microwave. The purity and quality of the compounds are checked through respective FT-IR and XRD analyses. After this, the electrochemical analysis CV test was carried out to verify the good conductivity of the composite. Chemicals are compounds that have a specific chemical structure. The number of chemicals is vast; hence chemicals can be classified based on their nature, application, and interaction with the organisms in the environment
Synthesis of Novel Nanocomposite Based ElectrochemicalSensing Platform for Water Remediation
(Library Information Services, COMSATS University Islamabad, Lahore Campus, 2024) Samreen Riaz; FA22-R06-005; Dr. Lubna Sherin; LHR TP 9320
One resilient element that is frequently utilized in many manufacturing operations is lead. Because of its enduring nature, it can linger in the atmosphere for quite a while and is harmful to the functioning of biological systems. Mining operations, along with incineration, are the main sources of copper release. As your liver is the first organ to access copper accumulation when it enters the bloodstream, chronic copper poisoning primarily affects it. The supposed advantages of electrochemical sensing are the simplicity of the apparatus, the extreme sensitivity and robust specificity of the test, mobility, and the ability to analyze the target analyte on-site. A nanocomposite of UiO-66-NH2@Ppy NWs@CoFe2O4 was prepared to determine trace amounts of copper and lead ions in water. The atomic structure and physicochemical properties of the prepared material were examined using XRD. The electrochemical behavior of the GCE modified with UiO-66-NH2@Ppy-NWs@CoFe2O4 was studied by means of cyclic voltammetry (CV). It was demonstrated that, with the UiO-66-NH2@Ppy NWs@CoFe2O4, Pb2+ and Cu2+ could be sensed via differential pulse voltammetry (DPV). As the concentration increased from 10 to 100 nM, a substantial linear response was achieved, with a lower limit of detection. The high sensitivity of the UiO-66-NH2@Ppy-NWs@CoFe2O4/GCE towards the electroanalytical applications marked its use for real-world applications in its as-prepared state.