Fe₃O₄/Mulberry Stem Biochar as a Potential Amendment for Highly Arsenic-Contaminated Paddy Soil Remediation.

IF 3.9 3区环境科学与生态学 Q2 ENVIRONMENTAL SCIENCES

Toxics Pub Date : 2024-10-22 DOI:10.3390/toxics12110765

Ziling Tang, Meina Liang, Yanmei Ding, Chongmin Liu, Qing Zhang, Dunqiu Wang, Xuehong Zhang

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引用次数: 0

Abstract

Magnetite-loaded biochar has recently received attention owing to its ability to remove arsenic from contaminated soil. In this study, mulberry stem biochar (MBC) and Fe₃O₄-loaded mulberry stem biochar (Fe₃O₄@MBC) were produced and used in a 100-day incubation experiment to investigate their performance in the stabilization of arsenic in paddy soil severely polluted by the As (237.68 mg·kg^-1) mechanism. Incubation experiments showed that Fe₃O₄@MBC was more effective in immobilizing As after incubation for 100 days. Moreover, adding Fe₃O₄@MBC facilitated the transformation of exchangeable heavy metals into organic-bound and residual forms, thereby reducing As available concentrations, mobility, and bioavailability in the soil, and elevating slightly the soil pH and dissolved organic carbon (DOC). The concentration of TCLP-extractable As (As_TCLP) in contaminated soil was reduced from 93.85 to 7.64 μg·L^-1 within 10 d, below the safety limit for drinking water set by the World Health Organization (WHO). The characterization results of Fe₃O₄@MBC after incubation indicated that the mechanisms for As passivation are linked to redox reactions, complexation, electrostatic attraction, surface adsorption, and coprecipitation. Conclusively, Fe₃O₄@MBC is a promising amendment in highly As-contaminated soil and provides a theoretical reference in such polluted paddy soil remediation.

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Fe3O4/桑树茎生物炭作为高砷污染稻田土壤修复的潜在改良剂。

由于磁铁矿负载生物炭具有从受污染土壤中去除砷的能力，因此最近备受关注。本研究制备了桑树茎生物炭（MBC）和负载 Fe3O4 的桑树茎生物炭（Fe3O4@MBC），并将其用于 100 天的培养实验，以考察它们在受到砷（237.68 mg-kg-1）机制严重污染的稻田土壤中稳定砷的性能。培养实验表明，Fe3O4@MBC 在培养 100 天后固定砷的效果更好。此外，添加 Fe3O4@MBC 还能促进可交换重金属向有机结合型和残留型转化，从而降低土壤中砷的可利用浓度、迁移率和生物利用率，并使土壤 pH 值和溶解有机碳（DOC）略有升高。受污染土壤中的 TCLP 可提取砷（AsTCLP）浓度在 10 d 内从 93.85 μg-L-1 降至 7.64 μg-L-1，低于世界卫生组织（WHO）规定的饮用水安全限值。培养后的 Fe3O4@MBC 表征结果表明，砷的钝化机制与氧化还原反应、络合、静电吸引、表面吸附和共沉淀有关。最后，Fe3O4@MBC 是一种很有前景的高砷污染土壤改良剂，为此类污染稻田土壤的修复提供了理论参考。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Toxics Chemical Engineering-Chemical Health and Safety

CiteScore

4.50

自引率

10.90%

发文量

681

审稿时长

6 weeks

期刊介绍： Toxics (ISSN 2305-6304) is an international, peer-reviewed, open access journal which provides an advanced forum for studies related to all aspects of toxic chemicals and materials. It publishes reviews, regular research papers, and short communications. Our aim is to encourage scientists to publish their experimental and theoretical results in detail. There is, therefore, no restriction on the maximum length of the papers, although authors should write their papers in a clear and concise way. The full experimental details must be provided so that the results can be reproduced. Electronic files or software regarding the full details of calculations and experimental procedure can be deposited as supplementary material, if it is not possible to publish them along with the text.