偶氮染料的高铁酸钾脱色及动力学研究

Study on azo dyes discoloration and kinetics by potassium ferrate

探索了高铁酸钾降解偶氮染料模拟废水的过程,考察了高铁酸钾用量、pH值、反应温度对反应过程与对象污染物降解的影响规律及脱色反应动力学.结果表明,酸性红B模拟废水的最佳脱色条件为:高铁酸钾用量70 mg/L,pH值6～10,常温;对于模拟废水,COD的去除率均远远小于色度去除率.高铁酸钾能将染料的主发色团—N=N—打断,脱色效果明显,但有机物的矿化程度仍然有限;模拟废水中染料的脱色反应符合一级反应动力学规律.

The degradation of azo dyes simulated wastewater using potassium ferrate was explored. The effect of potassium ferrate dosage, pH value and reaction temperature on the oxidation process and the degradation regulation of the object pollutant and the discoloration reaction kinetics were investigated.The results showed that the best discoloration conditions of Acid Red B was： 70 mg/L potassium ferrate, the optimum pH was 6-10, at room temperature; COD removal rate of the simulated wastewater was far lower than color removal rate. Potassium ferrate could break the main chromophore --N^N-- of dye, the discoloration effect was distinct, but the mineralization degree was limited, The discoloration reaction of simulated wastewater accorded with first-order kinetics equation.