ZnO·WO_3悬浮水溶液中SO_2的光催化氧化

Abstract

本文考察了znO·WO＿3悬浮水溶液中污染物SO＿2的可见光催化氧化并建议通空气处理较高浓度的扩水溶液。含0.15MOl/l水溶液可见光照2H可将基本上光催化氧化成.对这光助自发氧化反应中可能平行存在的自发、多相催化、光化学和光催化等反应进行实验对比；筛选出克分子比0.5znO·WO为最佳掺杂配比；考察了光催化剂热处理、空气流量、PH对光催化活性的影响，得出PH7.5为最佳值；太阳光催化氧化速率比室内实验更快，展现了利用太阳能于环保的应用前景，对所有实验结果都给以理论解释，并提出一个较详细的反应机理。

The photocatalytic oxidation of pollutant SO_2 in aqueous suspension of ZnO·WO_3 under visible light irradiation was investigated and an air Flowing was proposed to treatconcentrated solution.The,contained in an aqueous solution of 0.15 mol/L,was almost photocatalytically oxidized to produce within 2h irradiation.In photoassisted spontaneous oxidation of,such coexistent reactions as spon-taneous,heterogeneously catalytic,photochemical and photocatalytic reactions hclVe beencompared by experiments.Gram molecular ratio 0.5 ZnO.WO_3 was chosen to be the opti-mal doping ratio.The eFFect of the heat treatment of photocatalyst,air Flowing and pH onphotocatalytic activity has been determined and pH7.5 was identiFied to be the optimal。Solar photocatalytic oxidation of shows the Faster reaction rate than that in indoorexperimentst which develops a better prospects For the application of solar photocatalysisto environmental protection,All experimental results are explained in theory.A reactionmechanism has been proposed in detail.