| 酸性红3B的杂多酸光催化降解动力学 |
| 摘要点击 2325 全文点击 2476 投稿时间：2001-07-02 修订日期：2001-09-05 |
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| 中文关键词 光催化 光解 杂多酸 反应动力学 偶氮染料 |
| 英文关键词 photocatalysis photolysis heteropoly acid kinetics azo dye |
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| 中文摘要 |
| 以杂多酸Pw12O3-40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Pw12O3-40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/PW12O3-40法降解有机物的速率更快. |
| 英文摘要 |
| The kinetics of degradation of Acid Red 3B photocatalyzed by PW12O3-40 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/TiO2 method indicated that heteropoly acid is an efficient photocatalyst. |
