摘要
采用Cu(Ⅱ)协同热活化过氧乙酸(Cu(Ⅱ)-heat/PAA)降解水中双氯芬酸(DCF),识别了Cu(Ⅱ)-heat/PAA体系中的主要活性物质;考察了常见水基质(Cl^(−)、SO_(4)^(2−)、NO_(3)^(−)、HCO_(3)^(−)、天然有机质(NOM))对DCF去除的影响;探讨了该体系对天然水体中DCF的去除.结果表明,Cu(Ⅱ)-heat/PAA体系去除DCF的效率明显高于Cu(Ⅱ)/PAA和heat/PAA体系,表明热与Cu(Ⅱ)两者结合对PAA的活化具有协同作用.在pH 8时,羟基自由基(·OH)和有机自由基R-O·(CH_(3)C(=O)O·和CH_(3)C(=O)OO·)是Cu(Ⅱ)-heat/PAA体系去除DCF的主要活性物质,且R-O·对DCF去除的作用更大.在Cu(Ⅱ)-heat/PAA体系中,SO_(4)^(2−)、NO_(3)^(−)和HCO_(3)^(−)对DCF的去除几乎没有影响;Cl^(−)对DCF去除有微弱的促进效果;而NOM抑制DCF的降解,导致DCF在湖水和河水中的去除受到抑制.
Removal of diclofenac(DCF)in water by Cu(Ⅱ)-combined with heat activation peracetic acid(Cu(Ⅱ)-heat/PAA)was investigated,and the main active species in Cu(Ⅱ)-heat/PAA system were identified.The effects of common water matrix(Cl^(−),SO_(4)^(2−),NO_(3)^(−),HCO_(3)^(−)and natural organic matter(NOM))on the removal of DCF were explored and the degradation of DCF in natural water was studied.As a result,the removal efficiency of DCF in Cu(Ⅱ)-heat/PAA process presented a relatively faster rate than those in Cu(Ⅱ)/PAA and heat/PAA systems,indicating that the combination of heat and Cu(Ⅱ)had a synergistic effect on the activation of PAA.At pH 8,hydroxyl radical(·OH)and organic radicals(R-O·,CH_(3)C(=O)O·and CH_(3)C(=O)OO·)were the main active substances for DCF removal in Cu(Ⅱ)-heat/PAA system and R-O·played a major role in DCF removal.Presence of SO_(4)^(2−),NO_(3)^(−)and HCO_(3)^(−)had little effect on DCF degradation;Cl^(−)could weakly promote the degradation of DCF;NOM inhibited DCF removal,which resulted in the inhibition on DCF removal in lake water and river water.
作者
邓杰文
张琳悦
付永胜
刘义青
DENG Jiewen;ZHANG Linyue;FU Yongsheng;LIU Yiqing(Faculty of Geosciences and Environmental Engineering,Southwest Jiaotong University,Chengdu,611756,China)
出处
《环境化学》
CAS
CSCD
北大核心
2023年第4期1222-1229,共8页
Environmental Chemistry
基金
四川省科技厅应用基础研究项目(2021YJ0385)资助.
