摘要
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.
Tetrabutylammonium salt of SiW10We2 （Fe2POM） 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 Fe2POM-H2O2 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 Fe2POM-H2O2 〉〉 Fe2POM blank experiment.
出处
《感光科学与光化学》
EI
CSCD
2006年第6期444-449,共6页
Photographic Science and Photochemistry
基金
江苏省学科带头人基金(2001013)
镇江市社会发展基金(SH2005063).
关键词
甲基橙
光催化脱色
二铁取代硅钨酸盐
methyl orange
photodecolorization
diiron-substituted silicotungstate
