Spectrophotometric determination of persulfate by oxidative decolorization of azo dyes for wastewater treatment.
Spectrophotometric determination of persulfate by oxidative decolorization of azo dyes for wastewater treatment.
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DOI：
10.1039/c1em10454c
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发表时间：
2011-11
期刊：
影响因子：
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通讯作者：
Yaobin Ding;Lihua Zhu;Jingchun Yan;Qingqing Xiang;Heqing Tang
中科院分区：
文献类型：
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作者：
Yaobin Ding;Lihua Zhu;Jingchun Yan;Qingqing Xiang;Heqing Tang
过硫酸盐能有效地氧化偶氮染料使其脱色，基于偶氮染料的氧化脱色，建立了一种快速测定过硫酸盐的光度法，用于废水处理过程的监测。以4种不同分子结构的偶氮染料为探针，考察了反应时间、溶液pH、染料初始浓度、活化剂Fe（2+）初始浓度等操作参数对过硫酸盐测定的影响。在最佳条件下，四种偶氮染料的脱色度与过硫酸盐浓度呈线性关系，罗丹明B的线性范围和检出限分别为2.0-150 μmol L（-1）和0.62 μmol L（-1），亚甲基蓝的线性范围和检出限分别为2.0-100 μmol L（-1）和0.42 μmol L（-1），对甲基紫为4.0-150 μmol L（-1）和0.50 μmol L（-1）;对橙子Ⅱ为20-150 μmol L（-1）和8.1 μmol L（-1）。用新方法对一个废水样品进行了过硫酸盐处理，结果令人满意。
Persulfate can efficiently decolorize azo dyes through oxidizing these compounds, which enabled us to develop a method of rapid spectrophotometric determination of persulfate for monitoring the wastewater treatment on the basis of the oxidation decolorization of azo dyes. Four azo dyes with different molecular structures were investigated as probes, and the influences of operation parameters including reaction time, solution pH, initial dye concentration, and initial concentration of activator Fe(2+) were checked on the determination of persulfate. Under optimum conditions, the decolorization degree of the dyes responded linearly with persulfate concentration for all the four azo dyes, and the linear range and detection limit were found to be 2.0-150 μmol L(-1) and 0.62 μmol L(-1) for rhodamine B, 2.0-100 μmol L(-1) and 0.42 μmol L(-1) for methylene blue, 4.0-150 μmol L(-1) and 0.50 μmol L(-1) for methyl violet, and 20-150 μmol L(-1) and 8.1 μmol L(-1) for orange II. A persulfate treatment of a spiked wastewater sample was satisfactorily monitored with the new method.