Comparative Remediation of Arsenic and Antimony Co-Contaminated Soil by Iron- and Manganese-Modified Activated Carbon and Biochar.

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

Toxics Pub Date : 2024-10-12 DOI:10.3390/toxics12100740

Jiayi Han, Chuang Zhao, Min Yang, Mingheng Ye, Yani Li, Keke Zhou, Junrui Zhang, Peipei Song

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Abstract

At present, soil contaminated with arsenic (As) and antimony (Sb) is escalating at an alarming rate, which is harmful to human health. In this study, Fe- and Mn-modified activated carbon (AC) and biochar (BC) were prepared and compared for the remediation of As- and Sb-contaminated soil. The effects on the speciation of As and Sb, soil pH, organic matter (SOM), and enzyme activity with various dosages and remediation times were investigated. The results showed that on the whole, the best stabilization effect of As and Sb was achieved with 3% FeMnBC. Furthermore, with increases in time and dosage, the immobilization effect on As and Sb was more significant. Fe/Mn-modified AC and BC enhanced soil pH, with 3% MnAC being particularly effective; 3% AC and 3% FeMnAC demonstrated the most pronounced enhancement in SOM. The modified carbon materials exhibited a dramatic increase in enzymatic activity. In particular, urease activity showed an increasing trend, and catalase activity first decreased and then increased over 30 days. Among the treatments, 3% MnAC showed the most significant enhancements in catalase and urease activities, whereas 1% FeMnBC had the most pronounced effect on increasing sucrase activity. This study provides theoretical support for the remediation of soil co-contaminated with As and Sb by Fe/Mn-modified AC and BC.

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铁和锰改性活性炭与生物炭对砷和锑共污染土壤的比较修复。

目前，受砷（As）和锑（Sb）污染的土壤正在以惊人的速度增加，对人类健康造成危害。本研究制备了铁和锰改性的活性炭（AC）和生物炭（BC），并比较了它们对砷和锑污染土壤的修复作用。研究了不同剂量和不同修复时间对砷和锑的种类、土壤 pH 值、有机质（SOM）和酶活性的影响。结果表明，总体而言，3% 的铁锰酸铜对砷和锑的稳定效果最好。此外，随着时间和用量的增加，对砷和锑的固定效果更加显著。铁/锰改性的 AC 和 BC 能提高土壤 pH 值，其中 3% 的 MnAC 尤其有效；3% 的 AC 和 3% 的 FeMnAC 对 SOM 的提高最为明显。改性碳材料的酶活性显著提高。其中，脲酶活性呈上升趋势，过氧化氢酶活性在 30 天内先降后升。在各种处理中，3% 的 MnAC 对过氧化氢酶和脲酶活性的提高最为显著，而 1%的 FeMnBC 对蔗糖酶活性的提高效果最明显。这项研究为铁/锰改性 AC 和 BC 修复砷和锑共同污染的土壤提供了理论支持。

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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： The Journal accepts papers describing work that furthers our understanding of the exposure, effects, and risks of chemicals and materials in humans and the natural environment as well as approaches to assess and/or manage the toxicological and ecotoxicological risks of chemicals and materials. The journal covers a wide range of toxic substances, including metals, pesticides, pharmaceuticals, biocides, nanomaterials, and polymers such as micro- and mesoplastics. Toxics accepts papers covering: The occurrence, transport, and fate of chemicals and materials in different systems (e.g., food, air, water, soil); Exposure of humans and the environment to toxic chemicals and materials as well as modelling and experimental approaches for characterizing the exposure in, e.g., water, air, soil, food, and consumer products; Uptake, metabolism, and effects of chemicals and materials in a wide range of systems including in-vitro toxicological assays, aquatic and terrestrial organisms and ecosystems, model mammalian systems, and humans; Approaches to assess the risks of chemicals and materials to humans and the environment; Methodologies to eliminate or reduce the exposure of humans and the environment to toxic chemicals and materials.