Enhanced passivation of thallium, vanadium and arsenic in contaminated soils: critical role of Fe–Mn-biochar

IF 13.1 2区环境科学与生态学 Q1 ENVIRONMENTAL SCIENCES

Biochar Pub Date : 2024-06-20 DOI:10.1007/s42773-024-00344-z

Pengyuan Deng, Wenhuan Yuan, Jin Wang, Liangzhong Li, Yuchen Zhou, Jingzi Beiyuan, Haofan Xu, Shunlong Jiang, Zicong Tan, Yurong Gao, Diyun Chen, Juan Liu

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Abstract

Thallium (Tl), vanadium (V) and arsenic (As) are considered as typical toxic elements of increased interest. Their accumulation in soils can pose a substantial health threat to human beings. In this study, Fe–Mn modified biochar (FMBC) was chemically constructed to immobilize Tl, V and As in contaminated soils. The results showed that compared with pristine biochar (BC), FMBC can achieve significantly higher passivation effects for the studied contaminated soils, which reduced the bioavailable Tl, V and As contents by 83.9%, 71.09% and 71.92%, respectively. The passivation of Tl, As, and V via FMBC application was partially attributed to a notable increase in pH, which enhances the availability of adsorptive sites. Further, the newly formed minerals, including cancrinite, gibbsite and Fe–Mn (hydr)oxides, serve as additional adsorbents, substantially reducing the mobility of Tl, V and As. Additionally, the oxidation of Tl(I) to Tl(III) by the Fe–Mn (hydr)oxide of FMBC significantly enhanced Tl immobilization, consequently diminishing its bioavailability. The findings suggest that significant environmental threats could be alleviated through the potential application of FMBC in treating Tl-As-V dominated contamination in soils, providing a new perspective for the sustainable utilization of industrially polluted soils.

Graphical Abstract

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增强受污染土壤中铊、钒和砷的钝化：铁锰生物炭的关键作用

铊（Tl）、钒（V）和砷（As）被认为是典型的有毒元素，越来越受到人们的关注。它们在土壤中的积累会对人类健康造成严重威胁。在这项研究中，通过化学方法构建了铁锰改性生物炭（FMBC），以固定受污染土壤中的铅、钒和砷。结果表明，与原始生物炭（BC）相比，FMBC 对所研究污染土壤的钝化效果显著提高，生物可利用的 Tl、V 和 As 含量分别降低了 83.9%、71.09% 和 71.92%。施用 FMBC 对 Tl、As 和 V 的钝化作用部分归因于 pH 值的显著升高，这提高了吸附位点的可用性。此外，新形成的矿物（包括康松石、吉比特石和铁锰（氢）氧化物）作为额外的吸附剂，大大降低了 Tl、V 和 As 的流动性。此外，FMBC 的铁-锰（水合）氧化物将 Tl（I）氧化为 Tl（III），大大提高了 Tl 的固定性，从而降低了其生物利用率。研究结果表明，通过潜在应用 FMBC 来处理土壤中以 Tl-As-V 为主的污染，可以减轻对环境的重大威胁，为工业污染土壤的可持续利用提供了一个新的视角。

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来源期刊

Biochar Multiple-

CiteScore

18.60

自引率

10.20%

发文量

期刊介绍： Biochar stands as a distinguished academic journal delving into multidisciplinary subjects such as agronomy, environmental science, and materials science. Its pages showcase innovative articles spanning the preparation and processing of biochar, exploring its diverse applications, including but not limited to bioenergy production, biochar-based materials for environmental use, soil enhancement, climate change mitigation, contaminated-environment remediation, water purification, new analytical techniques, life cycle assessment, and crucially, rural and regional development. Biochar publishes various article types, including reviews, original research, rapid reports, commentaries, and perspectives, with the overarching goal of reporting significant research achievements, critical reviews fostering a deeper mechanistic understanding of the science, and facilitating academic exchange to drive scientific and technological development.