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.
Browse
3 results
Search Results
Item Synthesis and Characterization of MOF-on-MOF Hybrid for the Application of Photocatalysis(LHR TP 8641, 2023-02-27) Alia Farooq; SP22-R06-002; Dr. M. Shahid Nazir; LHR TP 8641Metal organic frameworks, made-up of organic ligands and inorganic connections used for extensive applications. The current study focused on the synthesis of efficient novel ZIF-67@MIL-96(Al) core shell hybrid for effective electrocatalytic water splitting. Hybrid was synthesized by solvothermal approach in which ZIF-67 serves as a shell and MIL-96(Al) as a core. For enhancing their stability novel hybrid was modified with CTAB and APTES. Synthesized and modified hybrids were characterized by IR and XRD, which were used to analyze the crystallinity and functional groups. The characterization peaks describe the successful formation of MOFs, MOF on MOF Hybrid & Modified Hybrids. The performance of this core shell novel material in terms of its ability to catalyze the oxygen evolution reaction in the process of water splitting was then assessed. The novel ZIF-67@MIL-96(Al) hybrid exhibits a very low overpotential of 210 mV at 10 mA cm−2 in 1 M KOH, as well as a Tafel slope of 62 mV dec−1. These performance metrics surpass those of both ZIF-67 & MIL-96(Al), which has overpotential of 272 mV 240 mV and Tafel values are 75 mV.dec-1 & 82 mV. dec-1. Furthermore, the electrode that was constructed exhibited remarkable chemical stability, therefore generating new opportunities for studying water splitting electrocatalysts which are essential for sustainable energy conversion. Hierarchical nanoarrays with core-shelled structure maximize active sites and efficient mass & electron transit increased electrochemical reaction surface area. This study describes a simple way to make excellent electrocatalysts for electrolysis of water, storage, and electrochemical energy conversion applications.Item Synthesis and Characterization of Cellulose based MOF for Photo-Catalytic Application(Library Information Services COMSATS University Islamabad Lahore Campus, 2021-02-26) Zarmina Ali; SP20-R06-015; Dr. M. Shahid Nazir; LHR TP 7569Metal organic frameworks are porous materials which are formed by the combination of organic and inorganic substances joined together by coordinate covalent bonds. This class of compounds possess many unique characteristic features. Such as high porosity, large surface area, stability and ability to modify their properties. MOFs are widely used for water treatment, sensing applications, in catalysis, removal of contaminants from air, and in targeted drug delivery applications. The Bio–MOFs with polysaccharides functionalities have gained a lot of importance due to their biocompatible nature and strengthened structures, without affecting internal properties of MOFs. Cellulose is a biodegradable, cost effective natural material which can be used to enhance the porosity, crystallinity & surface area of MOFs .However, Cellulose based MOFs show poor aqueous stability because cellulose swells in water due to its hydrophilic nature. In this work, hydrophobic composite of cellulose based Ni MOF composite is synthesized and has been explored for photocatalytic dye degradation. Aqueous stability of novel composite was achieved by its modification through adipic acid. After synthesizing cellulose from cotton stalk, it has been converted into nanocrystals to get versatile properties that is higher crystallinity. Ni MOF possesses excellent feature of narrow Band gap region (2.3 eV approximately).Narrow regions cause to improve the absorption of light rays, thereby facilitating dye degradation through photocatalysis. Two different combinations of MOFs that is CNCs @ Ni-MOF & CNCs @ AP@ Ni-MOF are synthesized. Kappa no. of extracted cellulose was found to be 30.5, which showed effective removal of lignin content from it.These novel composites are characterized via FTIR at each step during their preparation to confirm the successful modification. For CNCs @AP @ Ni MOF, the characteristic peak at 712cm-1 shows O-Ni-O bonding. The major peaks present in the regions of 3339 and 1102 cm−1, corresponding to the stretching vibrations of -OH functionality and glycosidic linkage (C-O-C) respectively. One of the major peak which proves the modification by adipic acid, was appeared at 1440 cm−1, ascribed the bendingItem Synthesis and Characterization of Modified Filler Mixed Matrix Membrane for Dyes Degradation(Library Information Services COMSATS University Islamabad Lahore Campus, 2020-02-19) Bushra Anees Palvasha; FA18-R06-021; Dr. M. Shahid Nazir; LHR TP 6499It is acknowledged that water is the survival key for life on earth. Millions of human lives expire due to privation of water quality, ineffective management as well as low-quality wastewater treatment protocols. Water contamination involves the addition of harmful impurities e.g., herbicides, pesticides, dyes, resins etc.. According to survey, above 0.7 million tons of organic dyes are manufactured per annum that are used in many commercial products of cosmetics, painting, foods, plastic, textile etc. Dyes from the textile industry has been identified as the most polluting agent in comparison to others in industrial sector due to the discharge of around 25% leaching of toxic chemicals to water system. Among these dyes, azo dyes contribute nearly 50% of these contaminations. Various protocols are approved and tested for the removal of dye color in wastewater, that are classified as chemical, physical, and biological methods. Among these, the conventional biological protocols are cited as less effective due to high salinity of dyes wastewater and high stability of dyes structure. Currently, photo-catalysis has been reflected as an effective protocol for the destruction of dye due to easy treatment protocols, recyclability, cost-effectiveness and ecofriendly nature. Among various photocatalysts, Polyoxometalates (POMs) are contributing much more due to effective photodegradation nature, low-cost and easy synthesis protocol. Polyoxometalates (POMs) are polyatomic anions comprising transition metal oxyanions associated with bridged oxygen atoms resulting in closed three-dimensional assemblies. Metal Organic Frameworks (MOFs) are novel porous constituents consist of several organic ligands and metal nodes through coordination links, which are characterized by a high degree of modularity, excellent porosity and versatility. Due to high surface area, well crystalline structure, porous nature and tunable properties of linkers, MOFs showed numerous impending applications such as, energy storage, gas uptake, heterogeneous catalysis, pollutant elimination etc. POMs and MOF hybrids such as POM based metal-organic frameworks (PMOFs) have been mostly reported in multidisciplinary research fields as brilliant candidates due to their characteristics properties. However, high solubility of POMs and difficulty facing in dealing powder catalyst limits their application on industrial scale