Study on the remediation effect and influencing factors of stabilized biochar supported with nano zero-valent iron on Cr(VI) in groundwater

QIAO Huayi; ZHAO Yongsheng; HU Jing

doi:10.16030/j.cnki.issn.1000-3665.202303022

2024 Vol. 51, No. 1

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Article navigation > Hydrogeology & Engineering Geology > 2024 > 51(1): 190-200

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QIAO Huayi, ZHAO Yongsheng, HU Jing. Study on the remediation effect and influencing factors of stabilized biochar supported with nano zero-valent iron on Cr(VI) in groundwater[J]. Hydrogeology & Engineering Geology, 2024, 51(1): 190-200. doi: 10.16030/j.cnki.issn.1000-3665.202303022

Citation:

QIAO Huayi, ZHAO Yongsheng, HU Jing. Study on the remediation effect and influencing factors of stabilized biochar supported with nano zero-valent iron on Cr(VI) in groundwater[J]. Hydrogeology & Engineering Geology, 2024, 51(1): 190-200. doi: 10.16030/j.cnki.issn.1000-3665.202303022

Study on the remediation effect and influencing factors of stabilized biochar supported with nano zero-valent iron on Cr(VI) in groundwater

1.
College of New Energy and Environment, Jilin University, Changchun, Jilin　130021, China
2.
National Local Joint Engineering Laboratory of Petrochemical Pollution Site Control and Remediationn Technology, Jilin University, Changchun, Jilin　130021, China

More Information

Corresponding author: ZHAO Yongsheng, zhaoyongsheng@jlu.edu.cn

Received Date: 09 March 2023

Revised Date: 15 May 2023

Publish Date: 15 January 2024

Abstract

Abstract

Nano zero-valent iron (nZVI) has problems such as agglomeration, passivation and poor transportability, which affect the in situ remediation effect of Cr(VI) contaminated groundwater. To develop a low-cost, green nZVI modified material, a low-cost, green modification for nZVI was developed. The nZVI@BC reaction system was constructed by supporting nZVI with ball-milled biochar (BC) as carrier and then stabilized with carboxymethyl cellulose (CMC). CMC-nZVI@BC was synthesized as a novel high-efficiency, anti-passivation nano-scale remediation material. The nZVI before and after modification was characterized and analyzed, and the effects of CMC-nZVI@BC addition, initial concentration of Cr(VI), pH and temperature and chemical fraction of groundwater on the removal of Cr(VI) by CMC-nZVI@BC were investigated, and the mechanism of Cr(VI) removal by CMC-nZVI@BC was elucidated, and the following conclusions were obtained: (1) The best removal of Cr(VI) by nZVI@BC at the Fe and C mass ratio of 2∶1; the removal rate of 50 mg/L Cr(VI) by 0.6 g/L CMC-nZVI@BC within 3 h reached 99.9%, exhibiting a high removal rate and capacity of Cr(VI). (2) The main mechanism of Cr(VI) removal by CMC-nZVI@BC was reduction and precipitation. (3) In the range of 2 to 10, the pH value had a significant effect on the removal of Cr(VI) by CMC-nZVI@BC, with less effect of temperature. (4) The presence of ${\mathrm{SO}}_4^{2-} $ promoted Cr(VI) removal, while ${\mathrm{HCO}}_3^{-} $, ${\mathrm{NO}}_3^{-} $, Ca²⁺, Mg²⁺ and humic acid, all had different degrees of inhibition on Cr(VI) removal. These results suggest that CMC-nZVI@BC can be an effective in situ remediation agent for Cr(VI) removal, offering the possibility of applying nZVI for in situ groundwater remediation.
- groundwater remediation /
- nano zero-valent iron /
- biochar /
- carboxymethyl cellulose /
- Cr(VI)

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References

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