H_2O_2、金属离子等对Cr(Ⅵ)离子光催化还原及对敌敌畏农药光催化氧化的影响

以Cr(Ⅵ )离子、敌敌畏农药作为污染物的代表 ,研究了H2 O2 、金属离子等对Cr(Ⅵ )离子光催化还原及对敌敌畏农药光催化氧化的影响 .结果表明 ,加入少量的H2 O2 对Cr(Ⅵ )离子的光催化还原起阻碍作用 ,对敌敌畏农药的光催化氧化起促进作用 ;加入少量的Cu2 +对Cr(Ⅵ )离子光催化还原及对敌敌畏农药的光催化氧化均起促进作用 ;加入Zn2 +、Na+对Cr(Ⅵ )离子及敌敌畏农药的光催化降解均无明显的影响 ;加入甲醇、甲苯对Cr(Ⅵ )离子的光催化还原起促进作用 ,对敌敌畏农药的光催化氧化起阻碍作用 .探讨了H2 O2 、金属离子等对Cr(Ⅵ )离子光催化还原及对敌敌畏农药光催化氧化影响的机理 .

EFFECTS OF H2O2 METAL IONS ETC. ON THE PHOTOCATALYTIC REDUCTION OF DICHROMATE AND PHOTOCATALYTIC OXIDATION OF DICHLORVOS

Effects of H 2O 2?metal ions et al on the photocatalytic reduction of dichromate and photocatalytic oxidation of dichlorvos were studied.The results showed that with the addition of a small amount of H 2O 2,the photocatalytic reduction of dichromate was hindered,while the photocatalytic oxidation of dichlorvos was accelerated.With the addition of trace amounts of Cu 2+ ,both of the two above mentioned reactions were accelerated.With the addition of Zn 2+ and Na +,no obviously effects on the reactions were observed.With the addition of methanol and toluene,the photocatalytic reduction of dichromate was accelerated,while the photocatalytic oxidation of dichlorvos was hindered.The possible mechanisms of the additives on the photocatalytic reduction of dichromate and photocatalytic oxidation of dichlorvos were also investigated.