详细信息

EDDS螯合Fe(Ⅲ)活化过硫酸盐技术对TCE的降解效果    

The Degradation Performance of Trichloroethylene by Means of Fe( Ⅲ)-EDDS Activated Persulfate Process

文献类型:期刊文献

中文题名:EDDS螯合Fe(Ⅲ)活化过硫酸盐技术对TCE的降解效果

英文题名:The Degradation Performance of Trichloroethylene by Means of Fe( Ⅲ)-EDDS Activated Persulfate Process

作者:王琰涤[1];吕树光[1];顾小钢[1,2];邱兆富[1];隋倩[1];郭旭虹[2]

机构:[1]华东理工大学,国家环境保护化工过程环境风险评价与控制重点实验室,上海市功能性材料化学重点实验室,上海200237;[2]华东理工大学,化学工程联合国家重点实验室,上海200237

年份:2015

卷号:28

期号:11

起止页码:1728

中文期刊名:环境科学研究

外文期刊名:Research of Environmental Sciences

收录:CSTPCD;;国家哲学社会科学学术期刊数据库;Scopus;北大核心:【北大核心2014】;CSCD:【CSCD2015_2016】;CSSCI:【CSSCI_E2014_2016】;

基金:国家自然科学基金项目(41373094,51208199);中国博士后科学基金项目(2015M570341)

语种:中文

中文关键词:TCE(三氯乙烯);活化过硫酸盐;EDDS(乙二胺二琥珀酸);螯合Fe(Ⅲ)

外文关键词:trichloroethylene; persulfate activation; ethylenediamine-N; N'-disuccinic acid; chelated Fe(Ⅲ);

摘要:为解决传统Fe(Ⅱ)活化过硫酸盐过程中Fe有效性较低的问题,采用可生物降解的EDDS(乙二胺二琥珀酸)螯合Fe(Ⅲ)活化过硫酸盐处理水溶液中的TCE(三氯乙烯),考察c(过硫酸盐)、c〔Fe(Ⅲ)〕/c(EDDS)〔下称Fe(Ⅲ)/EDDS〕、溶液初始p H以及阴离子浓度对TCE降解效果的影响,并研究体系中产生的活性氧自由基.结果表明:c(过硫酸盐)为15.0 mmol/L、Fe(Ⅲ)/EDDS为4时,60 min内TCE去除率达99.7%;提高c(过硫酸盐)、Fe(Ⅲ)/EDDS均有利于TCE降解,但超过一定限值后对TCE去除效果增强不明显;溶液初始p H(3~11)越高,TCE去除率越低;加入Cl-、HCO3-、SO42-和NO3-4种阴离子均会抑制TCE降解,抑制程度表现为HCO3-〉Cl-〉SO42-〉NO3-;自由基清扫试验证实体系中存在SO4-·、·OH和O2-·等3种活性氧自由基,·OH对TCE的降解起主导作用.因此,EDDS螯合Fe(Ⅲ)活化过硫酸盐技术能够产生以·OH为主的活性氧自由基,从而快速高效去除水溶液中TCE,但降解过程受水质参数影响.
To improve iron availability in the traditional Fe( Ⅱ)-activated persulfate( PS) process,degradation performance of trichloroethylene( TCE) in a Fe( Ⅲ)-( S,S)-ethylenediamine-N,N'-disuccinic acid( EDDS) activated PS system was studied,and the generation of reactive oxygen species( ROS) was investigated by means of radical scavenger tests. The effects of various factors,including initial PS concentration,Fe( Ⅲ) /EDDS molar ratio,solution p H and common anions in groundwater( Cl-,HCO3-,SO42-and NO3-)were evaluated. When the initial PS concentration was 15. 0 mmol/L and Fe( Ⅲ) /EDDS molar ratio was 4,99. 7% of TCE was removed in 60 min. TCE removal was found to be enhanced with increase of PS concentration and Fe( Ⅲ) /EDDS molar ratio,but did not further increase when either PS concentration or Fe( Ⅲ) /EDDS molar ratio was overdosed. In addition,elevating the initial solution p H value( from p H 3 to 11) led to decreases in TCE removal rate. Cl-,HCO3-,SO42-and NO3-adversely affected TCE degradation performance,and the extent of inhibition followed the sequence: HCO3- Cl- SO42- NO3-. Radical scavenger tests showed that SO4-·,·OH and O2-·were all responsible for TCE degradation in the PS-Fe( Ⅲ)-EDDS system,and·OH was the dominant radical.In conclusion, the Fe( Ⅲ)-EDDS activated PS process was effective for TCE removal in aqueous solution,while ·OH played a critical role in the system. However, TCE degradation performance was affected by the solution matrix,which could be encountered in real contaminated groundwater.

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