Photochemical behavior of benzo[a]pyrene on soil surfaces under UV light irradiation

查看全文 作　　者：ZHANG Li-[1,2,3]hong;LI Pei-[1]jun;GONG Zong-[1]qiang;Oni Adeola [4]A.

机构地区：[1]Institute of Applied Ecology, Chinese Academy of Sciences, Shenyang 110016, China;[2]Graduate University of Chinese Academy of Sciences, Beijing 100049, China;[3]Department of Environmental Science, University of Liaoning, Shenyang 110036, China;[4]Department of Zoology, University of Ibadan, Ibadan, Nigeria

出　　处：《Journal of Environmental Sciences》索引2006年第18卷第6期,共7页

基　　金：The National Basic Research Program (973) of China (No. 2004CB418506);the National Natural Science Foundation of China (No.20337010) ;the Hi-Tech Research and Development Program (863) of China (No. 2004AA649060) 摘　　要：The rates of photodegradation and photocatalysis of benzo[a]pyrene (BaP) on soil surfaces under UV light have been stu- died. Different parameters such as temperature, soil particle sizes, and soil depth responsible for photodegradation, catalyst loads and wavelength of UV irradiation blamed for photocatalysis have been monitored. The results obtained indicated that BaP photodegradation follows pseudo-first-order kinetics. BaP photodegradation was the fastest at 30℃. The rates of BaP photo- degradation at different soil particle size followed the order: less than 1 mm>less than 0.45 mm>less than 0.25 mm. When the soil depth increased from 1 mm to 4 mm, the half-life increased from 13.23 d to 17.73 d. The additions of TiO2 or Fe2O3 accelerated the photodegradation of BaP, and the photocatalysis of BaP follows pseudo-first-order kinetics. Changes in catalyst loads of TiO2 (0.5%, 1%, 2%, and 3% (wt)) or Fe2O3 (2%, 5%, 7%, and 10% (wt)) did not significantly affect the degradation rates. Both BaP photocatalysis in the presence of TiO2 and Fe2O3 were the fastest at 254 nm UV irradiation. 关键词：光降解作用光催化辐照土壤污染污染化学

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Photochemical behavior of benzo[a]pyrene on soil surfaces under UV light irradiation

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