FeAl-LDH-modified biochar (FeAl-LDH@BC): A high-efficiency passivator for hexavalent chromium (Cr(VI)) reduction and immobilization in contaminated soil

Sustainable Chemistry for the Environment Pub Date : 2024-10-09 DOI:10.1016/j.scenv.2024.100169

Rongjie Zhu , Wenying Yuan , Jing Cheng , Xinhong Qiu

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Abstract

A composite FeAl-LDH@BC obtained by successfully loading FeAl-LDH onto biochar (BC) is used to the Cr(VI)-contaminated soil remediation. The efforts of loading, initial pH, concentration and dosage are investigated. The results indicate that the immobilization process of Cr(VI) in soil could be well described by the pseudo-second-order kinetic model and maximum adsorption capacity of FeAl-LDH@BC is 42.78 mg/g at a temperature of 298 K. Additionally, The physicochemical properties of FeAl-LDH@BC are characterized by SEM, EDS, XRD, FTIR and XPS. The characterization results suggest that the immobilization mechanism involved adsorption and reduction. Cr(VI) is immobilized by adsorption to the layers of FeAl-LDH, the reduction of Cr(VI) to Cr(III) is then accomplished using Fe(II) as a reducing agent. In order to demonstrated the stability of composites for environmental restoration, the TCLP tests, dry-wet, freeze-thaw aging cycles, soil phytotoxicity tests, and microbial community are analyzed. The study shows that we provided a material for soil immobilization with high performance for the remediation of Cr(VI)-contaminated soil.

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FeAl-LDH 改性生物炭（FeAl-LDH@BC）：污染土壤中六价铬（Cr(VI)）还原和固定的高效钝化剂

在生物炭（BC）上成功添加 FeAl-LDH 后得到的 FeAl-LDH@BC 复合材料被用于六价铬污染土壤的修复。研究了负载、初始 pH 值、浓度和剂量的影响。结果表明，土壤中六价铬的固定化过程可以用伪二阶动力学模型很好地描述，在温度为 298 K 时，FeAl-LDH@BC 的最大吸附容量为 42.78 mg/g。此外，SEM、EDS、XRD、FTIR 和 XPS 对 FeAl-LDH@BC 的理化性质进行了表征。表征结果表明，固定化机制包括吸附和还原。铬（VI）通过吸附在 FeAl-LDH 层上而被固定，然后以铁（II）为还原剂将铬（VI）还原成铬（III）。为了证明复合材料在环境修复方面的稳定性，研究人员分析了 TCLP 试验、干-湿、冻-融老化周期、土壤植物毒性试验和微生物群落。研究结果表明，我们提供了一种具有高性能的土壤固定材料，可用于修复受六价铬污染的土壤。

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来源期刊

Sustainable Chemistry for the Environment

CiteScore

0.40

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0.00%

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