基于PMS的Cr(VI)-染料复合废水协同处理效果及机理

通过投加过一硫酸盐（PMS）探讨其协同处理偶氮染料金橙Ⅱ（AO7）及Cr（VI）的可行性、影响因素及机理.结果表明，体系可以在有效去除AO7的同时降低Cr（VI）浓度，120min时降解率分别达到97.9%及22.1%；随着初始pH值降低AO7降解及Cr（VI）去除效率逐渐升高；AO7的降解主要是由于Cl^-与PMS反应产生的氧化性物质HClO以及PMS投加创造的酸性条件使得Cr（VI）具有强氧化性的共同作用，其中起主导作用的是HClO；Cr（VI）的转化是由于自身与AO7发生氧化还原反应导致.本研究可以为复合污染废水的处理提供理论依据.

Synergistic treatment effect and mechanism of Cr(VI)-dye complex wastewater based on PMS

This article investigated the feasibility, influencing factors and mechanism of the synergistic treatment of azo dyes Ⅱ (AO7) and Cr (VI) by adding persulfate (PMS). The results showed that the system could reduce the Cr (VI) and remove AO7 simultaneously and the degradation rate reached 97.9% and 22.1% at 120 minutes, respectively. AO7 degradation and Cr (VI) removal efficiency increased gradually with the decrease of initial pH. The degradation of AO7 was mainly because of the combined functions of the oxidizing substance HClO produced when Cl^- reacts with PMS and the strong oxidizer Cr (VI) in acidic condition created by PMS. Among these two functions, HClO played the dominant role. In addition, the conversion of Cr (VI) was caused by the redox reaction between itself and AO7. Thus, this research could provide a theoretical basis for the treatment of compound polluted wastewater.