FeS介导下的1,2-二溴乙烷非生物自然衰减  

The abiotic natural attenuation of 1,2-dibromoethane mediated by FeS

作　　者：谷春云 廖高明 邓一荣 马杰[1] GU Chun-yun;LIAO Gao-ming;DENG Yi-rong;MA Jie(State Key Laboratory of Heavy Oil Processing,Beijing Key Lab of Oil&Gas Pollution Control,College of Chemical Engineering and Environment,China University of Petroleum-Beijing,Beijing 1022494,China;Guangdong Provincial Key Laboratory of Environmental Management and Remediation of Contaminated Sites,Guangdong-Hong Kong-Macao Environmental Quality Collaborative Innovation Laboratory,Guangdong Provincial Academy of Environmental Science,Guangzhou 510045,China)

机构地区：[1]中国石油大学(北京)化学工程与环境学院,重质油国家重点实验室,油气污染防治北京市重点实验室,北京102249 [2]广东省环境科学研究院,广东省污染场地环境管理与修复重点实验室,粤港澳环境质量协同创新联合实验室,广东广州510045

出　　处：《中国环境科学》2023年第9期4632-4638,共7页China Environmental Science

基　　金：国家自然科学基金资助项目(21878332,42177042);中国石油大学(北京)科研基金专项资金资助项目(2462022QNXZ006,2462022YXZZ011);国家重点研发计划项目(2022YFC370009205)。

摘　　要：研究了在厌氧环境中FeS(马基诺矿)对1,2-二溴乙烷(EDB)的还原降解.结果显示,在厌氧条件下FeS可有效降解EDB,降解反应符合一级反应动力学,校正后的kobs为(0.065±0.003)d^(-1)(R^(2)=0.91),EDB降解半衰期为11d.综合运用比表面仪(BET),X射线光电子能谱(XPS),X射线衍射(XRD)以及扫描电子显微镜-能谱分析(SEM-EDS)对反应前后的FeS进行了表征,数据显示FeS具有较大的比表面积,为反应提供了较多的活性位点.随着反应的进行FeS会转化为针铁矿(FeO(OH))和硫复铁矿(Fe_(3)S_(4)).EDB的降解速率随着硫化物浓度和FeS含量的增加而增加,且在高pH值条件下EDB降解的更快.另外金属离子Co^(2+)和Cu^(2+)能促进FeS对EDB的降解,而Mn^(2+)则会抑制该反应.综上,含水层介质中的FeS可以实现EDB的非生物自然衰减.The reduction degradation of 1,2-dibromoethane(EDB)by FeS in anaerobic environment was studied.The experimental data showed that FeS could effectively degrade EDB under anaerobic conditions.The degradation reaction conformed to the pseudo-first-order reaction kinetics.The corrected kobs value was(0.065±0.003)d^(-1)(R^(2)=0.91).The degradation half-life was 11days.FeS were characterized by BET,X-ray photoelectron spectroscopy(XPS),X-ray diffraction(XRD)and scanning electron microscope-energy spectroscopy(SEM-EDS).The results showed that FeS had a large specific surface area,which increased the number of reaction sites and thus enhanced the reduction degradation of EDB by FeS.In addition,FeS transformed to goethite and greigite during the reduction reaction.The degradation rate of EDB increased with increases in concentrations of sulfide(HS-)and FeS.At high pH,the reduction degradation of EDB by FeS was faster.In addition,the presence of transition metal ions Co^(2+)and Cu^(2+)could promote the degradation of EDB by FeS,while the presence of Mn^(2+)could inhibit the degradation of EDB.In general,the presence of FeS in the ground can achieve abiotic natural attenuation of EDB in EDB-contaminated groundwater sites.

关 键 词：卤代烃 地下水修复 地下水污染 加油站 自然衰减 含铅汽油 非生物降解 含铁矿物 

分 类 号：X523[环境科学与工程—环境工程]