Department of Chemistry
Permanent URI for this communityhttps://repository.cuilahore.edu.pk/handle/123456789/14
Browse
2 results
Search Results
Item 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 8640Arsenic, 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 scenariosItem 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 8661It 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.