作　　者： ; ; ; ; ; ; ;

机构地区： 中国科学院广州地球化学研究所有机地球化学国家重点实验室

出　　处： 《环境科学学报》 2005年第2期259-263,共5页

摘　　要： 采用比较简单的共沉淀法技术制备了纳米ZnO SnO2复合氧化物光催化剂,并将其负载在泡沫镍上制成了负载型纳米光催化剂,以三氯乙烯为挥发性有机物的模型反应物,研究了反应气流速、湿度等因素对反应的影响,同时考察了催化剂的失活特征,结果表明该负载型纳米光催化剂具有较高的光催化活性,同时具有较强的抗失活性能,在205h反应中没有出现失活现象. A coupled oxide ZnO-SnO_2, which was prepared by the co-precipitation method, was immobilized to porous nickel mesh by coating, and a ZnO-SnO_2/Ni supported photocatalyst was prepared. The photocatalytic degradation performance of the supported photocatalyst on chemical trichloroethylene (TCE) as gaseous model was investigated in the photocatalytic reactor.It was studied that some factors such as the gas flow rate, the relative humidity etc, which would influence the photocatalytic conversion efficiencies of TCE, and the lifetime of the supported photocatalyst also was tested. It was found that the gaseous photocatalysis over the supported photocatalyst is an efficient method for chlorinated hydrocarbon removal, and almost 100% conversion was found for TCE with a concentration up to 2350?mg·m^(-3) in flow-through dry synthetic gas stream. Moreover, the experiments keeping a long time run indicated the supported photocatalyst displayed long lifetime, and the deactivation of the supported photocatalyst had not been observed within the 205?h of the experimental period.

关 键 词： 负载型 失活 泡沫镍 纳米 反应 活性能 催化剂 光催化降解 复合氧化物

领　　域： [环境科学与工程] [理学] [理学]