M.Phil / MS
Permanent URI for this collectionhttps://repository.cuilahore.edu.pk/handle/123456789/30
This collection archives the complete set of theses produced by students of the COMSATS University Islamabad, Lahore Campus.
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Item 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 7564In 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.Item 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 9694Heavy 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.