铁电极耦合过硫酸盐降解典型PPCP的效能及机理

Performance and Mechanism on the Degradation of Typical PPCP by Iron Electrode Coupled with Persulfate

本文研究了铁电极活化过硫酸钠(EC/PS)产生自由基降解奥卡西平的反应,该方法10 min内对奥卡西平的去除率(75%)远远高于单独电絮凝(10%)和单独过硫酸盐氧化(2%)﹒探究了反应体系中奥卡西平初始浓度、电流、初始pH以及羟胺含量等因素对奥卡西平降解效率的影响,结果显示较高的电流(50 mA)、较低的奥卡西平浓度(10μM)及初始pH(pH=3)更有利于奥卡西平的降解﹒通过投加不同的过量猝灭剂(甲醇和叔丁醇),表明了反应体系中羟基自由基(OH·)和硫酸根自由基(SO_4^-·)同时存在,且均发挥重要作用﹒

The paper deals with the degradation of oxcarbazepine （OXC） by electrochemically activated persulfate （EC/PS） using iron anode. EC/PS system showed higher removal efficiency for OXC than electrocoagulation （10%） and PS oxidation alone （2%） in 10 min. Factors influencing the degradation efficiency of OXC were also investigated, including current density, initial concentration of OXC, initial pH, and concentration of hydroxylamine. Results demonstrated that higher current density （50 mA）, lower initial OXC concentration （10 μM） and pH （pH=3） were favorable for the degradation of OXC. Besides, by adding different dosages of scavengers （methanol and TBA）, hydroxyl radical （OH·） and sulfate radical （SO4-·） were identified to be responsible for OXC degradation, and both of them made major contributions.