硫化亚铁稳定化修复重金属污染湖泊底泥的效率及机理
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摘要
研究了硫化亚铁(FeS)对重金属污染湖泊底泥的稳定化修复效率及作用机制。结果表明:FeS能有效稳定化湖泊底泥中的重金属Cu、Pb和Cd。当水溶液初始pH=2,FeS的添加量为5%(质量分数)时,重金属Cu、Pb和Cd的稳定化率分别达到72.83%、55.25%和48.17%。水溶液初始pH在2~7范围内逐渐增加时,FeS对重金属的稳定化效率逐渐降低。在FeS稳定化重金属的过程中,Cu的稳定化主要通过形成CuS沉淀,Pb和Cd的稳定化均包含生成金属硫化物沉淀和Fe(OH)_3共沉淀过程,但Fe(OH)_3共沉淀对Pb的稳定化贡献显著大于Pb S沉淀,而Fe(OH)_3共沉淀和CdS沉淀对Cd的稳定化贡献相当。
The stabilization mechanism of heavy metals in contaminated lake sediments by FeS was studied.The results show that heavy metals were efficiently stabilized by FeS.Under the initial pH value of 2,the stabilization ratio of Cu,Pb,and Cd could achieve 72.83%,55.25%,and 48.17%,respectively,with an addition of 5%(mass fraction) FeS.The stabilization ratio of heavy metals reduced with increased pH in the range from 2 to 7.During the stabilization of heavy metals by FeS,the formation of Cu S dominated the stabilization of Cu,while the formation of metal sulfides and coprecipitation by Fe(OH)_3 jointly contributed to the stabilization of Pb and Cd.However,for the stabilization of Pb,the contribution of coprecipitation by Fe(OH)_3 was much higher than the formation of Pb S,whereas the contribution of the formation of Cd S was close to the coprecipitation by Fe(OH)_3 for the stabilization of Cd.
The stabilization mechanism of heavy metals in contaminated lake sediments by FeS was studied.The results show that heavy metals were efficiently stabilized by FeS.Under the initial pH value of 2,the stabilization ratio of Cu,Pb,and Cd could achieve 72.83%,55.25%,and 48.17%,respectively,with an addition of 5%(mass fraction) FeS.The stabilization ratio of heavy metals reduced with increased pH in the range from 2 to 7.During the stabilization of heavy metals by FeS,the formation of Cu S dominated the stabilization of Cu,while the formation of metal sulfides and coprecipitation by Fe(OH)_3 jointly contributed to the stabilization of Pb and Cd.However,for the stabilization of Pb,the contribution of coprecipitation by Fe(OH)_3 was much higher than the formation of Pb S,whereas the contribution of the formation of Cd S was close to the coprecipitation by Fe(OH)_3 for the stabilization of Cd.
引文
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[3]ZHANG Jin,LI Zhaohua,CHEN Jin,et al.Assessment of heavy metal contamination status in sediments and identification of pollution source in Daye Lake,Central China[J].Environmental Earth Sciences,2014,72(4):1279-1288
[4]PENG Jianfeng,SONG Yonghui,YUAN Peng,et al.The remediation of heavy metals contaminated sediment[J].Journal of Hazardous Materials,2009,161(2/3):633-640
[5]张彦浩,黄理龙,杨连宽,等.河道底泥重金属污染的原位修复技术[J].净水技术,2016,35(1):26-32
[6]GIRIPUNJE M D,FULKE A B,MESHRAM P U.Remediation techniques for heavy-metals contamination in lakes:A mini-review[J].Clean-Soil Air Water,2015,43(9):1267-1356
[7]骆永明.污染土壤修复技术研究现状与趋势[J].化学进展,2009,21(2/3):558-565
[8]赵述华,陈志良,张太平,等.重金属污染土壤的固化/稳定化处理技术研究进展[J].土壤通报,2013,44(6):1531-1536
[9]WEN Jia,YI Yuanjie,ZENG Guangming.Effects of modified zeolite on the removal and stabilization of heavy metals in contaminated lake sediment using BCR sequential extraction[J].Journal of Environmental Management,2016,178:63-69
[10]张琢,王梅,任杰,等.贝壳粉对污染土壤中Pb、Zn、Cd的稳定化作用[J].环境污染与防治,2016,38(1):14-18
[11]HAN D S,ORILLANO M,KHODARY A.Reactive iron sulfide(Fe S)-supported ultrafiltration for removal of mercury(Hg(Ⅱ))from water[J].Water Research,2014,53:310-321
[12]GONG Yanyan,TANG Jingchun,ZHAO Dongye.Application of iron sulfide particles for groundwater and soil remediation:A review[J].Water Research,2016,89:309-320
[13]XIONG Zhong,HE Feng,ZHAO Dongye,et al.Immobilization of mercury in sediment using stabilized iron sulfide nanoparticles[J].Water Research,2009,43:5171-5179
[14]ZHANG Meiyi,WANG Yu,ZHAO Dongye,et al.Immobilization of arsenic in soils by stabilized nanoscale zero-valent iron,iron sulfide(Fe S),and magnetite(Fe3O4)particles[J].Chinese Science Bulletin,2010,55(4/5):365-372
[15]TESSIER A,CAMPBELL P G C,BISSON M.Sequential extraction procedure for the speciation of particulate trace metals[J].Analytical Chemistry,1979,51(7):844-851
[16]MULLET M,BOURSIQUOT S,EHRHARD J J.Removal of hexavalent chromium from solutions by mackinawite,tetragonal Fe S[J].Colloids and Surfaces A:Physicochemical and Engineering Aspects,2004,244(1/2/3):77-85
[17]徐明岗,李菊梅,张青.p H对黄棕壤重金属解吸特征的影响[J].生态环境,2004,13(3):312-315
[18]CHRYSOCHOOU M,FAKRA S,MARCUS M A,et al.Microstructural analyses of Cr(Ⅵ)speciation in chromite ore processing residue[J].Environmental Science and Technology,2009,43(14):5461-5466