TiO₂/H₂O₂光催化体系降解亚甲基蓝的动力学研究

来源期刊：中南大学学报(自然科学版)2003年第5期

论文作者：丁敦煌 关鲁雄 杨松青 李伶慧

文章页码：513 - 515

关键词：污水处理;光催化;二氧化钛;过氧化氢

Key words：wastewater treatment; photocatalysis; TiO₂; H₂O₂

摘    要：采用TiO₂/H₂O₂催化体系对亚甲基蓝的光催化降解性能进行了动力学研究,结果表明:TiO₂和H₂O₂的光催化反应符合动力学一级反应规律;TiO₂的多相催化反应有诱导期,反应速度较慢;H₂O₂的均相催化没有诱导期,反应速度较快;TiO₂和H₂O₂的复合催化可同时利用不同波段的光,能提高光的利用率,加快HO自由基的生成及其在水中的传递,加快了有机物的降解过程,提高降解速度.

Abstract: The photocatalytic properties of TiO₂and H₂O₂ system for the degradation of methylene blue are studied. The degradation rate of methylene blue follows the first-order kinetics using TiO₂ and H₂O₂ as catalyst respectively, but there is a photochemical induction period for TiO₂ and it reduces the regradation rate. There is a synergetic reaction of TiO₂ and H₂O₂ in liquid phase and therefore the degradation rate of methylene blue is promoted. The studies are useful for organic dye wastewater treatment owing to the similar structure characteristics of methylene blue and dye.