Bir型氧化锰对阳离子黄X-5GL染料的脱色研究

采用溶胶凝胶法制得Birnessite(Bir)型氧化锰,并对阳离子黄X-5GL的模拟染料废水进行脱色研究。在考察废水处理体系初始pH、Bir型氧化锰用量等影响因素的基础上,进一步考察了Mg2+、Ca2+及重金属离子(Pb2+、Cd2+、Hg2+)对脱色效果的影响。结果表明,Bir型氧化锰对阳离子黄X-5GL具有很好的脱色效果。当pH=2.5、Bir型氧化锰为5 mg时,反应5 min脱色率即达到98%;Mg2+、Ca2+及重金属离子(Pb2+、Cd2+、Hg2+)对脱色效果均无明显影响。pH=2.5时的降解反应近似为一级反应,反应速率常数为0.206 9 min-1。

Study on decolorization of Cationic Yellow X-5GL Wastewater by Birnessite-Type Manganese Oxides by Birnessite Type of Manganese Oxides

The decolorization of a cationic dye,Cationic Yellow X-5GL,was carried out using birnessite-type manganese oxides prepared by the sol-gel method.On the basis of investigating the influences of factors, such as initial pH,the dose of birnessite-type manganese oxides,the study further discussed the influence of Mg2+,Ca2+,and heavy metal ions(Pb2+,Cd2+,Hg2+).The results showed that birnessite-type manganese oxides have well decolorization effect on Cationic Yellow X-5GL.The decolorization ratio can reach to 98% in five minute when pH was 2.5 and the dose of manganese oxides was 5mg.The metal ions above had no obvious effect on decolorization of dye.The decomposition date at pH 2.5 nearly followed first-order kinetics and the reaction rate constant is 0.2069min-1.