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.

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
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.
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