摘要
研究了Fe2+活化过硫酸盐(PS)对水中双氯芬酸钠(DCF)的降解,调查了pH、Fe2+用量、PS用量、Cl-、常见过渡金属离子以及常见还原剂对Fe2+/PS降解DCF的影响.结果表明:DCF在pH 2.0—9.0范围内均有一定的去除效果,且pH 3.0时效果最佳;Fe2+与S2O82-的最佳投加摩尔比为1∶1,过量的Fe2+可消耗部分硫酸根自由基从而抑制DCF降解;Cl-对DCF的降解具有一定的促进作用,且Cl-浓度越大,促进作用越大;Ce3+和Co2+对DCF的降解几乎没有影响,而Cu2+和Mn2+具有一定的促进作用;抗坏血酸和硫代硫酸钠具有双重作用,在低浓度时对DCF的降解具有促进作用,高浓度时呈现抑制作用,而盐酸羟胺和亚硫酸氢钠在研究的浓度范围内均呈现促进作用.
In this study,the influence of pH,Fe2+dosage,PS dosage on the degradation of diclofenac(DCF)by Fe2+activated persulfate(PS)was investigated.The effect of Cl-,common transition metal ions,and reductants on DCF degradation by Fe/PS was also evaluated.It was found that DCF could be effectively degraded in the pH range of 2.0—9.0,and the optimal pH was 3.0.The optimal Fe2+/PS molar ratio for DCF reduction was found to be 1∶1,while excessive Fe2+would inhibit the degradation by acting as a SO4·-scavenger.In addition,Cl-could promote the degradation of DCF,and higher concentrations of Cl-were beneficial to the promotion effect.Ce3+and Co2+had little effect on the degradation of DCF,while Cu2+and Mn2+had a slight promotion.Ascorbic and Na2S2O3 showed dual effects,which promoted the degradation of DCF at low concentrations but inhibited it at high concentrations.Both NH2OH·HCl and NaHSO3 had an obvious promotion effect on the degradation of DCF.
作者
王鸿斌
王群
刘义青
付永胜
吴鹏
WANG Hongbin;WANG Qun;LIU Yiqing;FU Yongsheng;WU Peng(Faculty of Geosciences and Environmental Engineering,Southwest Jiaotong University,Chengdu,611756,China)
出处
《环境化学》
CAS
CSCD
北大核心
2020年第4期869-875,共7页
Environmental Chemistry
基金
四川省科技厅重大专项(2018SZDZX0026)及重点研发项目(2017SZ0175)
中央高校基本科研业务费科技创新项目(2682018CX32)资助
作者简介
通讯联系人:付永胜,E-mail:fuyosh@163.com
