Hexavalent chromium transformation during transport of L − cysteine modified nano − zero − valent iron supported by biochar via green synthesis in water and soil systems

IF 2.8 3区 农林科学 Q3 ENVIRONMENTAL SCIENCES
Congcong Cheng, Haijun Chen, Nan Xu, Shan Zhang
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引用次数: 0

Abstract

Purpose

The Cr(VI) removal capacity of green synthesized nano-zero-valent iron (GnZVI) using tea polyphenols (TPs) remains limited. To improve their application in contaminated soil and groundwater, the GnZVI was modified. This is necessary for in-situ remediation of heavy metal-contaminated soil and groundwater.

Materials and methods

The GnZVI-based carbon-composite (L&GnZVI@BC) was successfully constructed via the synergistic effect of L-cysteine modification and biochar support. The Cr(VI) removal capacity and transportability of L&GnZVI@BC were investigated in soil–water system by batch and column experiments.

Results and discussion

Comparison with two materials of GnZVI separately modified by L-cysteine (L-GnZVI) or supported by biochar (GnZVI@BC)), GnZVI composite with a combination modification of L-cysteine and biochar (L&GnZVI@BC, L-cysteine/biochar/Fe = 0.1/0.1/1) showed a much higher Cr(VI) removal capacity in soil and groundwater. The synergistic effect of the reduction of L-cysteine functional groups and the dispersibility of biochar support can enhance the transportability of L&GnZVI@BC in water-saturated sand media for more Cr(VI) adsorption at neutral pH; while that improved the soluble Fe(II) released from composite for the higher reduction of Cr(VI) into Cr(III) at acidic pH. Particularly, L&GnZVI@BC favored more Cr(III) generation during transport in porous media at lower pH when applied in the treatment of Cr(VI) contamination.

Conclusion

This research highlights that the modification of both L-cysteine and biochar was beneficial to sufficient transport and efficient remediation in Cr(VI)-contaminated soil and groundwater environments at different pH ranges. This study’s results provide a theoretical support for the practical application of nZVI composites in in-situ remediation of Cr(VI)-contaminated soil and groundwater via an environmental-friendly approach.

Abstract Image

生物炭通过绿色合成支持的 L - 半胱氨酸修饰的纳米零价铁在水和土壤系统中迁移过程中的六价铬转化
目的 使用茶多酚(TPs)绿色合成的纳米零价铁(GnZVI)去除六价铬的能力仍然有限。为了提高其在受污染土壤和地下水中的应用,对 GnZVI 进行了改性。材料与方法通过 L-半胱氨酸改性和生物炭支撑的协同作用,成功构建了基于 GnZVI 的碳复合材料(L&GnZVI@BC)。通过批次和柱实验研究了 L&GnZVI@BC 在土壤-水系统中的六价铬去除能力和迁移性。结果与讨论与分别经 L-半胱氨酸改性(L-GnZVI)或生物炭支撑(GnZVI@BC)的两种 GnZVI 材料相比,经 L-半胱氨酸和生物炭组合改性的 GnZVI 复合材料(L&GnZVI@BC,L-半胱氨酸/生物炭/铁=0.1/0.1/1)在土壤和地下水中的六价铬去除能力要高得多。L&GnZVI@BC 在水饱和砂介质中的迁移性与生物炭支持物的分散性的协同作用,可提高 L&GnZVI@BC 在中性 pH 值下的 Cr(VI) 吸附能力;而在酸性 pH 值下,可提高复合材料释放的可溶性 Fe(II) 将 Cr(VI) 还原成 Cr(III) 的能力。特别是,在处理六价铬污染时,L&GnZVI@BC 在较低 pH 值的多孔介质中的迁移过程中有利于生成更多的三价铬。本研究的结果为 nZVI 复合材料通过环境友好型方法在受六价铬污染的土壤和地下水原位修复中的实际应用提供了理论支持。
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来源期刊
Journal of Soils and Sediments
Journal of Soils and Sediments 环境科学-土壤科学
CiteScore
7.00
自引率
5.60%
发文量
256
审稿时长
3.5 months
期刊介绍: The Journal of Soils and Sediments (JSS) is devoted to soils and sediments; it deals with contaminated, intact and disturbed soils and sediments. JSS explores both the common aspects and the differences between these two environmental compartments. Inter-linkages at the catchment scale and with the Earth’s system (inter-compartment) are an important topic in JSS. The range of research coverage includes the effects of disturbances and contamination; research, strategies and technologies for prediction, prevention, and protection; identification and characterization; treatment, remediation and reuse; risk assessment and management; creation and implementation of quality standards; international regulation and legislation.
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