铁电极活化过硫酸盐对金橙G的降解

研究了铁电极活化过硫酸盐（EC/PDS）产生的具有强氧化性的硫酸根自由基（SO4-·）对溶液中金橙G（orange G，OG）的氧化降解行为。重点考察了电流强度、PDS投加量、金橙G初始浓度、溶液初始pH值以及共存阴离子对金橙G降解速率的影响。实验结果表明：相比单独絮凝（EC）和投加过硫酸盐（PDS），EC/PDS体系能够有效地去除金橙G；金橙G的去除效率随着电流强度的增大而增大，随着PDS投加量的增大而增大，随着金橙G初始浓度增大而减小；较低的溶液pH值更利于OG的降解。水中共存阴离子对金橙G的降解存在着不同程度的抑制作用：PO43- > CO32- > Cl-。此外，通过加入不同的淬灭剂（甲醇和叔丁醇），确定了体系中主要存在的自由基。

Degradation of iron electrode as sodium persulfate activator for orange G

The paper deals with the degradation of orange G(OG) in aqueous solutions by electrochemically activated peroxydisulfate(EC/PDS)oxidation. These processes are based on the generation of sulfate radicals(SO4-·), which are strong oxidizing species.The effects of current intensity, PDS dosage, initial OG concentrations, initial pH of solution and coexisting anions in solution were studied. The results show that EC/PDS system can degrade OG more effectively than EC and PDS alone. The degradation rate of OG increases with the increase of the current intensity and the dosage of PDS, the degradation rate of OG decreases with the increase of the initial OG concentrations. Low initial pH are favorable for OG degradation. Coexisting anions exhibit different degrees of inhibition effects, the degree of inhibition abiding from strong to weak by the following order:PO43- > CO32- > Cl-. Furthermore, the main radicals are determined by adding different scavengers (methanol and tert-butanol).