摘要
利用苯作为捕获剂确证铁 (Ⅲ ) 柠檬酸盐配合物光解产生了羟基自由基 ,对染料橙黄Ⅱ在铁 (Ⅲ ) 柠檬酸盐配合物引发下的光化学脱色规律和机制进行了研究。结果表明 ,在 12 5W高压汞灯 (λ≥ 36 5nm)照射下 ,铁 (Ⅲ ) 柠檬酸盐配合物光解产生的羟基自由基可氧化橙黄Ⅱ分子发色团使其脱色 ;8mg/L橙黄II溶液光照 1h后可脱色 6 0 %～ 70 % ;在 8～ 5 0mg/L初始质量浓度范围内 ,橙黄Ⅱ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 ;体系 pH值在 4 0～ 6 0之间脱色效果较好 ,而在Fe(Ⅲ )绝对浓度一定的条件下 ,铁 (Ⅲ )与柠檬酸盐摩尔比小于 1时 。
The formation of hydroxyl radicals on photolysis of Fe(Ⅲ)-citrate complex in aqueous solution was identified by using benzene as scavenger. The decolorization of an azo dye Orange Ⅱ in aqueous solution was then investigated in the presence of Fe(Ⅲ)-citrate complex. The results indicate that a solution of 8 mg/L OrangeⅡ could be decolorized with an efficiency of 60%～70% under the illumination with a high-pressure mercury lamp(125 W, λ≥365 nm) in an hour. The decolorization of dye at the concentration ranged in 8～50 mg/L was in accordance with pseudo-first order law reaction, and the decolorization rate decreased with increase of the initial dye concentration. The comparatively higher decolorization efficiency was achieved at pH values of 4～6. At a given concentration of ferric ions, the decolorization was faster when the Fe(Ⅲ)/citrate ratio was less 1, and the decolorization efficiency increased with increase of the citrate ions.
出处
《应用化学》
CAS
CSCD
北大核心
2004年第6期546-550,共5页
Chinese Journal of Applied Chemistry
基金
国家自然科学基金项目资助 ( 4 0 2 0 10 45
2 0 1770 17)
