引用本文:
吴峰, 朱凡, 邓南圣, 向武. 铁(Ⅲ)-柠檬酸盐配合物光解引发橙黄Ⅱ的脱色[J]. 应用化学,
2004, 21(6): 546-550.
Citation: WU Feng, ZHU Fan, DENG Nan-Sheng, XIANG Wu. Decolorization of OrangeⅡ Induced by Photolysis of Fe(Ⅲ)-Citrate Complex in Aqueous Solution[J]. Chinese Journal of Applied Chemistry, 2004, 21(6): 546-550.
Citation: WU Feng, ZHU Fan, DENG Nan-Sheng, XIANG Wu. Decolorization of OrangeⅡ Induced by Photolysis of Fe(Ⅲ)-Citrate Complex in Aqueous Solution[J]. Chinese Journal of Applied Chemistry, 2004, 21(6): 546-550.
铁(Ⅲ)-柠檬酸盐配合物光解引发橙黄Ⅱ的脱色
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125W高压汞灯(λ≥365nm)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60%~70%;在8~50mg/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,染料脱色率随柠檬酸盐浓度的增加而提高。
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关键词:
- 铁(Ⅲ)-柠檬酸盐配合物
- / 橙黄Ⅱ
- / 光降解
- / 脱色
English
Decolorization of OrangeⅡ Induced by Photolysis of Fe(Ⅲ)-Citrate Complex in Aqueous Solution
Abstract:
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.
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Key words:
- Fe(Ⅲ)-citrate complex
- / Orange Ⅱ
- / photodegradation
- / decolorization
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