摘要
以杂多酸PW12 O3- 40 为催化剂 ,研究了酸性红 3B的光催化降解动力学 .光强、催化剂浓度、酸性红 3B初始浓度对光催化的速率均有正效应 .其中 ,光解速率与光强、酸性红 3B初始浓度成正比 ;在催化剂浓度不大 (吸光值 <2 )时 ,光解速率与催化剂投加量成正比 .体系中的溶解氧对催化剂起到氧化再生作用 ;驱氧条件下 ,由于催化剂再生受到抑制 ,光解速率减慢 .PW12 O3- 40 光催化降解酸性红 3B的动力学符合Langmuir Hinshelwood模型 ,溶液中催化剂和酸性红 3B之间存在预络合作用 ,达到平衡后发生光氧化 .与UV/TiO2 法相比 ,UV/PW12 O3- 40
The kinetics of degradation of Acid Red 3B photocatalyzed by PW 12 O 3- 40 was studied in aqueous solution. Light intensity, dissolved oxygen, added amount of the catalyst, and the initial concentration of substrate had positive effects on the photodegradation rate of Acid Red 3B. The results were explained by Langmuir Hinshelwood model, implying there was precomplexation between catalyst and substrate. Results compared to UV/TiO 2 method indicated that heteropoly acid is an efficient photocatalyst.
出处
《环境科学》
EI
CAS
CSCD
北大核心
2002年第3期40-43,共4页
Environmental Science
基金
国家重点基础研究专项经费资助项目(G19990 4 5 711)
