Fe^(2+)耦合热活化过硫酸盐降解土壤中四溴双酚A  

Degradation of tetrabromobisphenol A by ferrous coupling thermally activated persulfate in soil

作　　者：李韬略 袁雪红 陈传胜 孙美桢 薛南冬 LI Taolüe;YUAN Xuehong;CHEN Chuansheng;SUN Meizhen;XUE Nandong(College of Environmental Science and Engineering,Central South University of Forestry and Technology,Changsha,410004,China;Technical Center for Soil,Agricultural and Rural Ecology and Environment,Ministry of Ecology and Environment of the People’s Republic China,Beijing,100012,China;Chinese Research Academy of Environmental Sciences,Beijing,100012,China)

机构地区：[1]中南林业科技大学环境科学与工程学院,长沙410004 [2]生态环境部土壤与农业农村生态环境监管技术中心,北京100012 [3]中国环境科学研究院,北京100012

出　　处：《环境化学》2023年第8期2730-2739,共10页Environmental Chemistry

基　　金：国家重点研发计划(2017YFD0800700,2016YFD0800202)资助。

摘　　要：有效降解和去除土壤中四溴双酚A(TBBPA)是土壤环境化学研究热点.本文研究了Fe^(2+)耦合热活化过硫酸盐体系(Fe^(2+)/热/PS)对土壤中TBBPA的降解,并考察温度、Fe^(2+)初始浓度、PS浓度、初始pH值、无机阴离子(Cl^(−)、HCO_(3)^(-))浓度以及金属离子(Cu^(2+)、Zn^(2+)、Ni^(2+))浓度的影响.结果表明,Fe^(2+)/热/PS降解TBBPA的效果远高于同等条件下单一热活化和Fe^(2+)活化的情况;提高温度和PS浓度能够促进土壤TBBPA的降解;而过量的亚铁离子会导致TBBPA去除率下降,Fe^(2+)与PS的最佳摩尔比为0.5:1;Fe^(2+)耦合热活化PS体系具有较宽的pH应用范围,在酸性条件下更有利于降解;温度55℃、Fe^(2+)浓度25 mmol·L^(−1)、PS浓度50 mmol·L^(−1)、pH=3下,土壤TBBPA初始浓度为20 mg·kg^(−1),培养12 h,土壤TBBPA的降解效率达到了100%;低浓度Cl−对Fe^(2+)/热/PS体系的影响不显著,高浓度的Cl−会促进TBBPA的降解,而HCO_(3)^(-)在研究浓度范围内均呈现抑制作用;Cu^(2+)和Ni^(2+)对Fe^(2+)/热/PS体系均表现出较好的促进作用,而随着Zn^(2+)浓度的增加,TBBPA的降解速率呈现出先减小后增大的变化.Degradation and removal of tetrabromobisphenol A(TBBPA)from soil is a hot topic in soil environmental chemistry research.In this study,the degradation of tetrabromobisphenol A(TBBPA)by ferrous coupling thermally activated persulfate system(Fe^(2+)/heat/PS)in soil was investigated.The effects of temperature,initial Fe^(2+)concentration,PS concentration,initial pH,inorganic anions(Cl−,HCO_(3)^(−))concentration and other metal ions(Cu^(2+),Zn^(2+),Ni^(2+))concentration were also evaluated.The results showed that the degradation rate of TBBPA by Fe^(2+)/heat/PS was much more effective than that the single thermal activation or Fe^(2+)activation under the same conditions;TBBPA removing effect was found to be enhanced through increasing the temperature and PS concentration;Excess amount of ferrous ion would lead to the declination of TBBPA removal efficiency and the optimal molar ratio of Fe^(2+)/PS was 0.5:1;Fe^(2+)coupling thermally activated PS system has a wide range of pH applications and the TBBPA was more conducive to degraded under acidic conditions;The degradation efficiency of soil TBBPA reached 100%for 12 hours when the initial concentration of soil TBBPA was 20 mg·kg^(−1) at 55℃,Fe^(2+)concentration 25 mmol·L^(−1),PS concentration 50 mmol·L^(−1) and pH=3;Cl^(−)has dual effect on the removal of TBBPA in the Fe^(2+)/heat/PS system,which inhibited the degradation of TBBPA at low concentrations but promoted it at high concentrations,both HCO_(3)^(−) had an obvious inhibition effect on the degradation of TBBPA.Cu^(2+)and Ni^(2+)promoted the degradation of TBBPA by Fe^(2+)/heat/PS system,and the degradation rate of TBBPA decreased first and then increased with the increase of Zn^(2+)concentration.

关 键 词：四溴双酚 A 均相催化剂 亚铁离子 过硫酸盐 高级氧化 

分 类 号：X53[环境科学与工程—环境工程]