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Unformatted text preview: TiO2/activated carbon has been successfully fabricated on glass substrates via dip-coating method. The purpose of the fabrication was to remove phenol from aqueous solution via the synergistic process of photocatalysis – adsorption as opposed to the conventional suspension method. The catalyst (TiO2 Degussa-P25) and activated carbon (AC) adsorbent were synergistically operated via the incorporation of the two processes which are the adsorption of phenol into AC layer, followed by the photocatalytic degradation of phenol by the TiO 2 layer. The immobilized single layer of TiO2 followed first order rate constant of Langmuir-Hinshelwood equation whereas the single layer of immobilized AC showed the second order rate constant. Therefore, the bilayer TiO2/AC followed the second order rate constant since the adsorption process was more favourable in the b ilayer system. The -2 optimum catalyst loading on the AC layer was found to be 0.327 mg cm . Operational parameters such -2 as pH of solution, light intensity and O2 supply were evaluated and were found to be at pH 6, 6.0 W m -1 of UV leakage and 100 mL min of aeration rate, respectively. The percentage of phenol’s removal and the rate constant by TiO2/AC bilayer system after 90 minutes of irradiation was found to be 93.42 % and -1 -1 -1 0.0154 M min while the rate constant for the single layer of TiO2 and AC was 0. 0065 min and 0.0126 -1 -1 M min , respectively. The percentage of removal by bilayer system could achieve 100 % if the time of irradiation was prolonged up to 6 hours. 98 3rd ICYC 2010 Universiti Sains Malaysia ENV-O23 23rd-25th June 2010 DEGRADATION OF DEET BY OZONATION IN AQUEOUS SOLUTION Tay Kheng Soo, Noorsaadah Abd Rahman and Mhd. Radzi Abas Department of Chemistry, Faculty of Science, University of Malaya, 50603 Kuala Lumpur, Malaysia E-mail: firstname.lastname@example.org N,N-diethyl-m-toluamide (DEET) is an active ingredient in most insect repellents. It function s as a blocker to insect’s chemoreceptor that sense carbon dioxide and lactic acid in locating their host. Recently, contaminations of this compound in aquatic environment and even dr...
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This note was uploaded on 02/17/2011 for the course CHEMISTRY 101 taught by Professor Csr during the Spring '11 term at University of Louisville.
- Spring '11