Assessment of Polyethylene Terephthalate Waste Carbon and Periwinkle Shells-based Chitosan as Adsorbent for Trichloroacetic Acid Removal from Wate
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Date
2022
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Institute of Ecology and Enviromental Studies, Faculty of Science, Faculty of Science, Obafemi Awolowo University.
Abstract
The study determined the physicochemical parameters and trichloroacetic acid concentrations of the water samples before and after conventional treatment at the Obafemi Awolowo University, Ile-Ife water treatment plant. It also investigated the adsorption efficiencies of chitosan modified and unmodified adsorbent prepared from polyethylene terephthalate waste and periwinkle shells for the removal of trichloroacetic acids in the water samples. The study further compared the adsorption efficiencies of commercially available activated carbon with the chitosan modified and unmodified adsorbents. These were with a view to providing information on the adsorption efficiencies of polyethylene terephthalate waste carbon and periwinkle shells-based chitosan with commercially available activated carbon for the removal of trichloroacetic acid from water.
Polyethylene terephthalate was obtained from the Obafemi Awolowo University Campus, while the periwinkle shell utilized for chitosan extraction was obtained from the Eket Main Market in Akwa-Ibom State. Caustic alkali produced from cocoa pod husk was used to activate the PET. The activated carbon was made by carbonizing the caustic alkali impregnated Polyethylene Terephthalate (PET) in a furnace at 500 °C for 1 hour. For elemental and surface morphology determinations, the activated carbon was evaluated using Energy Dispersive X-ray (EDX) and Scanning Electron Microscope (SEM). The Fourier Transform-Infrared (FT-IR) spectroscopic technique was used to determine the structural chemical functional groups in activated carbon. Chitosan was made by deproteinizing, demineralizing, decolourizing, and deacetylating the periwinkle shell. Using a UVvis Spectrophotometer, the level of trichloroacetic acid (TCA) in water samples was detected at 530 nm. Batch adsorption tests were conducted to investigate the removal of TCA under a variety of conditions, including the effect of concentration, adsorbent dosage, pH, and agitation time.
Adsorption isotherms were calculated using experimental data from various initial TCA concentrations. The adsorption kinetics were also used to identify a potential rate-limiting phase during the adsorption process.
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ABIOYE B . O (2022) Assessment of Polyethylene Terephthalate Waste Carbon and Periwinkle Shells-based Chitosan as Adsorbent for Trichloroacetic Acid Removal from Water. NSTITUTE OF ECOLOGY AND ENIRONMENTAL STUDIES, FACULTY OF SCIENCE, OBAFEMI AWOLOWO UNIVERSITY.