02090cas|a2200241 i 450000500170000000800410001703500150005810000220007324500550009526000520015030000350020249000270023750001050026450200580036952010600042765000410148770000320152870000520156070000440161271000680165681000590172485600650178320260818095309.0230399s1993    th  uzm rtt  00|  a1eng d  a.b102311831 aSaha, Uttam Kumar10aEffects of pH on photocatalysis of trichlorophenol  aBangkok :bAsian Institute of Technology,c1993  a66 leaves +e1 online resource1 aThesis ;vno. EV-93-25  aA thesis submitted in partial fulfillment of the requirement for the degree of Master of Engineering  aThesis (M.Eng.) - Asian Institute of Technology, 1993  aThe effects of pH on the photocatalytic decomposition of 2,4,6-trichlorophenol (TCP) with UV illuminated titanium dioxide powder in aqueous suspension were investigated. A first order reaction with respect to 2, 4, 6-TCP concentration was obtained. Higher degradation rate was observed under alkaline condition than acidic condition. The role of adsorption of 2,4,6-TCP onto the TiO2 surface was found insignificant in photocatalysis. The reaction rate was enhanced by the addition of sodium chloride at pH 10. But at pH 5 a decrease in reaction rate was observed. The photocatalytic decomposition of deaerated TCP solution with or without sodium chloride addition gives lower degradation rate than with dissolved oxygen at different pH. A mechanism for the reaction based on photogeneration of hydroxyl radical was proposed. For a 20 mg/L of 2,4,6-TCP the average rate of solar degradation resulted in a decrease in concentration to 2 mg/L within 160 min. Higher potentiality of solar energy for the purification of water containing 2, 4,6-TCP was found. 0aSewagexPurificationxPhenol removal1 aTanaka, Shuzo,eChairperson1 aReutergardh, Lars Baetz,eExamination committee1 aVisvanathan, C.,eExamination Committee2 aSwedish International Development Authority,eScholarship donor2 aAsian Institute of Technology.tThesis ;vno. EV-93-25  3Full-Textuhttp://203.159.5.9/ait-thesis/detail.php?q=B16675