锰负载炭化土壤对重金属的吸附性能及机理

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摘要采用高锰酸钾预处理和限氧热解相结合的方法处理石油污染土壤(PCS),并将其转化为负载锰氧化物的炭化土壤(Mn-CS).与单独热解处理获得的炭化土壤相比,Mn-CS粗糙多孔,具有更高的比表面积、微孔体积和更低的可溶有机物浸出风险.Langmuir等温线模型和拟二阶动力学模型可以很好地拟合Mn-CS对重金属的吸附特性.Mn-CS对Pb²⁺、Cu²⁺、Zn²⁺和Cd²⁺的最大理论吸附量分别为420.54,81.19,79.73,26.40mg/g.Mn-CS吸附的重金属主要与Fe/Mn氧化物结合,其次与碳酸盐和有机物结合.吸附过程以单层化学吸附为主,主要机理包括表面络合、共沉淀和矿物束缚/沉淀.高锰酸钾预处理增加了土壤表面的碳酸盐、锰氧化物和无定形碳含量,从而协同提升了Mn-CS对重金属的吸附性能.本研究提供了实现PCS增值转化的新方法,助推PCS治理从达标修复走向资源化利用.

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	于珍珍
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关键词 ：石油污染土壤, 热解, 高锰酸钾, 重金属, 吸附剂

Abstract：In this study, a combination of permanganate pretreatment and oxygen-limited pyrolysis was used to treat and convert petroleum-contaminated soil (PCS) into carbonized soil loaded with manganese oxides (Mn-CS). Compared with the carbonized soil (CS) obtained by solo pyrolysis treatment, the Mn-CS is rough and porous, with higher specific surface area, micropore volume and lower leaching risk of soluble organic matter. The adsorption properties of Mn-CS for heavy metals can be well fitted by Langmuir isotherm model and pseudo-second-order kinetic model. The maximum theoretic adsorption capacity of Mn-CS for Pb²⁺, Cu²⁺, Zn²⁺and Cd²⁺is 420.54, 81.19, 79.73 and 26.40mg/g, respectively. The adoption processes are dominated by single-layer chemical adsorption. The heavy metals adsorbed by Mn-CS are mainly bound to Fe/Mn oxides, followed by bound to carbonate and organic matter. The adsorption mechanism includes surface complexation, coprecipitation and mineral binding/precipitation. Permanganate pretreatment significantly enhances the adsorption performance by increasing carbonate, manganese oxides and amorphous carbon on the surface of soil. Thus, the adsorption capacity of Mn-CS for heavy metals is synergistically improved. This study provided a new method to realize the value-added transformation of PCS, which is supposed to promote PCS treatment mode from up-to-standard remediation to resource utilization.

Key words： petroleum-contaminated soil pyrolysis permanganate heavy metals adsorbent

收稿日期: 2023-12-01

PACS:

X53

基金资助:国家自然科学基金资助项目(42207085);江苏省重点研发(社会发展)项目(BE2021637)

通讯作者: 王明新,教授,wmxcau@163.com E-mail: wmxcau@163.com

作者简介: 于珍珍(2002-),女,江苏连云港人,常州大学本科生,主要研究土壤污染防治.2464304828@qq.com.

引用本文:

于珍珍, 杨一帆, 高航, 王明新. 锰负载炭化土壤对重金属的吸附性能及机理[J]. 中国环境科学, 2024, 44(7): 3900-3909. YU Zhen-zhen, YANG Yi-fan, GAO Hang, WANG Ming-xin. Adsorption performance and mechanism of heavy metals by manganese-loaded carbonized soil. CHINA ENVIRONMENTAL SCIENCECE, 2024, 44(7): 3900-3909.

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http://www.zghjkx.com.cn/CN/ 或 http://www.zghjkx.com.cn/CN/Y2024/V44/I7/3900

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