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Synergism of citric acid and zero-valent iron on Cr(VI) removal from real contaminated soil by electrokinetic remediation.

Abstract

This study focused on enhanced electrokinetic remediation of Cr(VI) in real contaminated soil. The citric acid (CA) as the electrolyte and Fe(II) released from zero-valent iron (ZVI) under anoxic conditions functioned as the main reducer. They were used for overcoming the high insoluble Cr(VI) fraction in real contaminated soil and high Cr(VI) residue in acidic soil near the anode simultaneously. The synergism of CA and ZVI is that CA helps the release of Cr(VI) to react with the generated Fe(II) and alleviates the hindrance of Fe and Cr co-precipitates in electromigration of Cr; meanwhile, the end product Fe(III) from ZVI catalyzed the Cr(VI) reduction by CA. The removal of Cr(III) and Cr(VI) was significantly improved in real contaminated soil. The optimum result (82.86%) was obtained at a voltage gradient of 2.5 V/cm after 12-day remediation with a 10 g ZVI dose when the catholyte and anolyte were 0.2 mol/L and 0.1 mol/L CA, respectively. This configuration has a significant improvement in overcoming the current obstacles for Cr(VI) electrokinetic remediation from real contaminated soil and prospects for large-scale practical applications.

Authors+Show Affiliations

State Key Laboratory of Coal Mine Disaster Dynamics and Control, Chongqing University, Chongqing, 400044, China.State Key Laboratory of Coal Mine Disaster Dynamics and Control, Chongqing University, Chongqing, 400044, China.State Key Laboratory of Coal Mine Disaster Dynamics and Control, Chongqing University, Chongqing, 400044, China.State Key Laboratory of Coal Mine Disaster Dynamics and Control, Chongqing University, Chongqing, 400044, China.State Key Laboratory of Coal Mine Disaster Dynamics and Control, Chongqing University, Chongqing, 400044, China. j.binquan@cqu.edu.cn. City College of Science and Technology, Chongqing University, Chongqing, 400044, China. j.binquan@cqu.edu.cn.Department of Construction Management, Chung Hua University, No. 707, Wufu Rd., Sec. 2, Hsinchu, 30012, Taiwan. ycshiau@chu.edu.tw.State Key Laboratory of Coal Mine Disaster Dynamics and Control, Chongqing University, Chongqing, 400044, China. litonwei@cqu.edu.cn.

Pub Type(s)

Journal Article

Language

eng

PubMed ID

31853846

Citation

Zheng, Yi, et al. "Synergism of Citric Acid and Zero-valent Iron On Cr(VI) Removal From Real Contaminated Soil By Electrokinetic Remediation." Environmental Science and Pollution Research International, 2019.
Zheng Y, Yan Y, Yu L, et al. Synergism of citric acid and zero-valent iron on Cr(VI) removal from real contaminated soil by electrokinetic remediation. Environ Sci Pollut Res Int. 2019.
Zheng, Y., Yan, Y., Yu, L., Li, H., Jiao, B., Shiau, Y., & Li, D. (2019). Synergism of citric acid and zero-valent iron on Cr(VI) removal from real contaminated soil by electrokinetic remediation. Environmental Science and Pollution Research International, doi:10.1007/s11356-019-06820-5.
Zheng Y, et al. Synergism of Citric Acid and Zero-valent Iron On Cr(VI) Removal From Real Contaminated Soil By Electrokinetic Remediation. Environ Sci Pollut Res Int. 2019 Dec 18; PubMed PMID: 31853846.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Synergism of citric acid and zero-valent iron on Cr(VI) removal from real contaminated soil by electrokinetic remediation. AU - Zheng,Yi, AU - Yan,Yujie, AU - Yu,Lin, AU - Li,Huilin, AU - Jiao,Binquan, AU - Shiau,YanChyuan, AU - Li,Dongwei, Y1 - 2019/12/18/ PY - 2019/07/18/received PY - 2019/10/18/accepted PY - 2019/12/20/entrez KW - Catalyzer Fe(III) KW - Cr fractions KW - Electromigration KW - Insoluble fraction Cr(VI) KW - Reduction KW - Residue Cr(VI) JF - Environmental science and pollution research international JO - Environ Sci Pollut Res Int N2 - This study focused on enhanced electrokinetic remediation of Cr(VI) in real contaminated soil. The citric acid (CA) as the electrolyte and Fe(II) released from zero-valent iron (ZVI) under anoxic conditions functioned as the main reducer. They were used for overcoming the high insoluble Cr(VI) fraction in real contaminated soil and high Cr(VI) residue in acidic soil near the anode simultaneously. The synergism of CA and ZVI is that CA helps the release of Cr(VI) to react with the generated Fe(II) and alleviates the hindrance of Fe and Cr co-precipitates in electromigration of Cr; meanwhile, the end product Fe(III) from ZVI catalyzed the Cr(VI) reduction by CA. The removal of Cr(III) and Cr(VI) was significantly improved in real contaminated soil. The optimum result (82.86%) was obtained at a voltage gradient of 2.5 V/cm after 12-day remediation with a 10 g ZVI dose when the catholyte and anolyte were 0.2 mol/L and 0.1 mol/L CA, respectively. This configuration has a significant improvement in overcoming the current obstacles for Cr(VI) electrokinetic remediation from real contaminated soil and prospects for large-scale practical applications. SN - 1614-7499 UR - https://www.unboundmedicine.com/medline/citation/31853846/Synergism_of_citric_acid_and_zero-valent_iron_on_Cr(VI)_removal_from_real_contaminated_soil_by_electrokinetic_remediation L2 - https://dx.doi.org/10.1007/s11356-019-06820-5 DB - PRIME DP - Unbound Medicine ER -