二铁取代硅钨酸盐光解引发甲基橙的脱色

合成了SiW10Fe2的季胺盐(Fe2POM),并对其结构进行了表征.以Fe2POM为催化剂,研究了甲基橙的起始浓度、催化剂添加量、不同pH值等因素对光脱色速率的影响.利用异丙醇作为·OH捕获剂,探讨了甲基橙在Fe2POM-H2O2体系中的光化学脱色规律和机制.结果表明:体系在较宽的pH范围内具有高的光脱色活性,40—160mg/L初始质量浓度范围内,甲基橙的脱色速率随初始浓度降低而升高,脱色过程符合表观一级反应动力学规律.各体系的光脱色活性依次为:Fe2POM-H2O2单纯的Fe2POM>单纯的光照.

Decolorization of Methyl Orange Induced by Photolysis of Diiron- Substituted Silicotungstate

Tetrabutylammonium salt of SiW_ 10 Fe_2 (Fe_2POM) was synthesized and methyl orange (MO) was taken as photodecolorization test compound. Rate of photodecolorization was probed over original concentration of MO, dose of catalyst, diversity of pH. Isopropyl alcohol was taken as ·OH scavenger and mechanism of MO photodecolorization under Fe_2POM-H_2O_2 system was studied. The results indicated that high photodecolorization efficiency was achieved at wide pH range. The photodecolorization of MO at the concentration ranged at 40-160 mg/L was in accordance with apparent first order reaction and the photodecolorization rate decreased with increase of the initial MO concentration. The activity of photodecolorization is in the turn of Fe_2POM-H_2O_2Fe_2POM>blank experiment.