Synthesis of Cetyltrimethylammonium chloride Coated Diatomite Ceramic Membrane Impregnated with TiO2 Nanoparticles for the Removal of Hexavalent Chromium(VI)
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Date
2019-06
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Addis Ababa University
Abstract
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.
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Keywords
Removal of Hexavalent Chromium Ions from wastewater, Sol-gel method, Tio2 nanoparticles, Cationic surfactant, Surface modified Ceramic Membrane