Center for Materials Engineering

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Browsing Center for Materials Engineering by Author "Anteneh, Marlgn"

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    Synthesis of Cetyltrimethylammonium chloride Coated Diatomite Ceramic Membrane Impregnated with TiO2 Nanoparticles for the Removal of Hexavalent Chromium(VI)
    (Addis Ababa University, 2019-06) Daniel, Getachew; Anteneh, Marlgn
    In this study, manufacture of ceramic membranes modified by nanomaterials (Tio2) and CTAC was done. Materials were synthesized by the application of the sol-gel method with respective amounts measured in the molar ratio of Ti: Ethanol: HCL: H2O as 1:15:0.3:5. The coating of Tio2 was done by two methods. The first method involves coating the sample with the prepared sol and subsequently letting the gelation process to occur. The gel-coated ceramic was then calcinated at 550 c resulting in a Tio2 coated ceramic sample. The second method involves preparing Tio2 particles with the formed 0 0 c resulting in Tio2 powders. Taking the newly formed Tio2 powder with Nitric acid (HNO3) in the ratio of 0.5 gm Tio2 powder: 10ml of HNo3; rigorous mixing for three hours has yielded a solution. Whereby a second sample was Immersed and calcined at the previous temperature. The prepared samples were then Immersed again in a solution formed by CTAC and water at a ratio of 5gm:100ml. The coated samples where finally dried and prepared for the testing. Material characterization and filtration tests were conducted to check whether or not the samples were acceptable. SEM/EDS Mapping as well as XRD tests was done to determine the morphology and phase composition of the manufactured material. Performance in the form of efficiency was also conducted by the use of filtration test as another form of characterization. The results obtained confirmed that the prepared membrane has met all the objectives of the study and has successfully removed hexavalent chromium from water solution. The calculated efficiency value of the respected modified and unmodified membranes has been found to be 73.01% for the unmodified gel calcination at 550 membrane while Tio2 modified is found to be 80.05% and CTAC modified 85.44% respectively.