Browsing by Author "LHR TP 7317"

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    Fabrication of High Value PET Based Membranes from Waste Plastic Bottles
    (Library Information Services COMSATS University Islamabad Lahore Campus, 2021-02-23) Sajjad Hussain; FA19-R06-015; Dr. Asim Laeeq Khan; LHR TP 7317
    Use of organic membranes for purification and separation purpose is enhanced in modern era. Fabrication of these membranes is based on availability of different type of polymers. Recent literature has documented the effects of these polymers. Furthermore, use of these polymers boosts the cost of the membranes. At present, environment friendly, viable and cost effective materials are replacing these expensive polymers for the fabrication of membranes. In this view, current research work aims at the fabrication of polymeric membranes by incorporating eco-friendly and abundantly available waste plastic bottles (PET: polyethylene terephthalate) as a substrate. Initially PET was extracted from waste plastic bottles and then, was used to fabricate cost effective membranes. The extracted PET was characterized through FTIR analysis. Fabricated membranes were tested for desalination purpose. Water flux and salt rejection was measured and graphs were plotted. The results showed that an increase in polymer concentration resulted in form of decline in water flux and enhancement of salt rejection. This study also aims to provide easy and cost effective way to remove salts from sea water.
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    Synthesis of Electrochemical Biosensor for Detection of Phosphate in Saliva
    (Library Information Services COMSATS University Islamabad Lahore Campus, 2020-02-23) Muhammad Irfan; SP19-R06-029; Dr. Abdur Rahim; LHR TP 7317
    Calcium phosphate is one of the abundant restoratives and bioactive materials which helps in the restoration of bones and early carious lesions. These re-mineralizing resins are mainly composed in the form of calcium orthophosphate. It is the challenge and need of the day to cure the disease by keeping the amount of calcium phosphate, fluoride, and pH of saliva constant means moderate. Now it is the need of the day to make it possible of performing different medical tests results and cure on the spot in this busy era. For this purpose, an electrochemical biosensor method was introduced. This method is robust, accurate, selective, and sensitive for phosphate detection. The combined effect of metal oxide/graphene oxide nanocomposites has attracted a lot of attention. Iron oxide nanoparticles and their composite have several properties that make them interesting for device applications including catalytic activity, high surface area, electrochemical activity, and oxygen transferability. In this work, doped iron oxide/graphene oxide and iron oxide /reduce graphene oxide nanocomposites have been synthesized by hydrothermal and co-precipitation methods. The synthesized materials Fe2O3/GO and Fe2O3/rGO were characterized by (FTIR, XRD, SEM, EDX, and Raman spectroscopy. The electrochemical analytical techniques (cyclic voltammetry, amperometry, and electrochemical impedance spectroscopy) were used for the evaluation of electrochemical sensing properties. The glassy carbon electrode (GCE) surfaces were modified with the synthesized materials (Fe2O3/GO and Fe2O3/rGO ) and tested as an electrochemical sensor for phosphate detection. The proposed sensors Fe2O3/GO/GCE and Fe2O3/rGO/GCE gave excellent results for the detection of phosphate. The Fe2O3/rGO/GCE sensor gave better results as compared to Fe2O3/rGO/GCE because the rGO is highly conductive as compared to the GO. The sensor did not show any interference from the co-existing species (uric acid, glucose, and H2O2 ). The fabricated sensor successfully detected phosphate.