增强型电场协助光催化降解有机污染物  

The Enhanced Electro assisted Photocatalytic Degradation of Organic Water Contaminants

作　　者：吴合进[1] 吴鸣[1] 谢茂松[1] 刘鸿[1] 杨民[1] 孙福侠[1] 杜鸿章[1] 

机构地区：[1]中国科学院大连化学物理研究所,大连116023

出　　处：《催化学报》2000年第5期399-403,共5页

基　　金：中国科学院重大项目!(KJ95 1 Al 5 0 5 )

摘　　要：以颗粒状TiO2 为光催化剂 ,以苯酚溶液的降解为模型反应 ,实现了在电场协助下三维光电组合催化反应 .实验发现 ,在相同的反应条件下 ,电解反应和光催化反应中苯酚的降解率分别为 10 %和 33 6 % ,而光电组合催化过程中苯酚的降解率为 82 8% ,存在明显的协同作用 .产生这种协同作用的主要原因是 ,电解水反应可有效地为光催化反应提供氧源 ,以及阳极偏压可有效地减少光生电子和空穴的复合 .此外 ,还研究了电量和溶液酸碱性对光电组合催化反应活性的影响 .对实际工业废水处理的小试实验表明 ,该方法可取得较高的COD(化学需氧量 )A three dimensional electro assisted photocatalytic system was constituted with granular TiO 2 as photocatalyst. The photocatalytic efficiency of phenol degradation was observed to be 10% and 33 6% respectively for common water electrolysis and photocatalysis, while that to be 82 8% for the combination of both of them, i.e. , the electro assisted photocatalytic system. According to the experimental results, both water electrolysis and anode bias are considered to be responsible for the electro synergism, which may effectively provide active oxygen source and prevent more recombination of photo generated charges, respectively. The influence of charge amount and aqueous pH were also investigated. Moreover, practical application of the system in treatment of an industrial wastewater was tentatively investigated and found to be effective.

关 键 词：电助光催化 二氧化钛 苯酚 降解 有机污染物 

分 类 号：O643.3[理学—物理化学]