生物炭-铁锰氧化物复合材料修复As(Ⅲ)污染土

张文杰; 李西斌; 黄津祥

doi:10.11779/CJGE20240209

生物炭-铁锰氧化物复合材料修复As(Ⅲ)污染土 English Version

1.
台州学院建筑工程学院, 浙江台州 318000
2.
嘉兴大学建筑工程学院, 浙江嘉兴 311300
3.
上海大学土木工程系, 上海 200444

基金项目:

国家自然科学基金项目 52478353

国家自然科学基金项目 52078467

详细信息

作者简介:
张文杰(1978—)，男，博士，教授，主要从事环境岩土工程方面的研究工作。E-mail: zhwjlyl@163.com

通讯作者:
李西斌, E-mail: ytulxb@zafu.edu.cn

中图分类号: TU411
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出版历程
- 收稿日期: 2024-03-10
- 网络出版日期: 2024-09-28
- 刊出日期: 2025-05-31

Remediation of As(Ⅲ)-contaminated soils using Fe-Mn oxides-modified biochar

1.
School of Civil Engineering and Architecture, Taizhou University, Taizhou 318000, China
2.
School of Civil Engineering and Architecture, Jiaxing University, Jiaxing 311300, China
3.
Department of Civil Engineering, Shanghai University, Shanghai 200444, China

摘要

摘要: 生物炭（BC）已被广泛应用于重金属污染水土修复，但由于土中As(Ⅲ)以络阴离子形式存在，易与生物炭产生静电排斥，直接使用生物炭进行稳定化的效果不佳。制成生物炭-铁锰氧化物复合材料（FMO-BC）修复As(Ⅲ)污染土，利用锰氧化物将As(Ⅲ)氧化为低移动性的As(Ⅴ)，通过铁氧化物进行稳定化，并通过生物炭负载的方式解决铁锰氧化物（FMO）易团聚的问题。通过合成沉降淋滤试验、生物有效性试验、连续提取试验和光谱分析研究了FMO-BC修复As(Ⅲ)污染土的效果和机理。结果表明，FMO-BC的修复效果显著优于同掺量的FMO，7%的FMO-BC掺量下As稳定化效率达到98.6%；FMO经BC负载后具有更多活性点位可与As反应，从而降低了As的生物有效性；由于FMO和生物炭的中和作用，掺入FMO-BC后土体pH不会显著升高，从而避免了高pH导致的As浸出；FMO-BC修复后更多As被转化为稳定形态，环境风险大大降低；FMO-BC可将86.9%的As(Ⅲ)氧化为As(Ⅴ)，FMO-BC主要通过氧化、吸附、络合和沉淀反应实现As稳定化。
- As(Ⅲ)污染土 /
- 铁锰氧化物 /
- 生物炭 /
- 稳定化 /
- 浸出毒性
Abstract: The biochar (BC) has been widely used in treatment of heavy metals-contaminated water and soil. However, it is not effective in stabilizing As(Ⅲ) in soils due to the electrostatic repulsion between the biochar and the anion group As. The iron-manganese oxides-modified biochar (FMO-BC) is proposed for remediation of As(Ⅲ)-contaminated soils. The manganese oxide can oxidize As(Ⅲ) into less mobile As(Ⅴ), and the iron oxide can stabilize As(Ⅴ), while the biochar loading can avoid the aggregation of iron-manganese oxides (FMO). The remediation effectiveness and mechanisms are investigated through the synthetic precipitation leaching procedure, bioavailability tests, sequential extraction procedure and a series of spectroscopic/microscopic analyses. The results show that the remediation of FMO-BC is significantly more effective than FMO. At a 7% FMO-BC dosage, the stabilization efficiency reaches 98.6%. After the biochar support, more active sites are obtained for FMO to react with As, and therefore the bioavailability is reduced. The neutralizing actions of that of FMO with biochar avoids a significant increase in soil pH, thereby reduces the As leaching associated with high pH. A lot of As is transformed into stable forms after the FMO-BC remediation, thus reducing the environmental risks of As. 86.9% of As(Ⅲ) is oxidized to As(Ⅴ) by FMO-BC. The oxidation, adsorption, complexation and precipitation reactions are the main mechanisms involved in As stabilization.
- As(Ⅲ)-contaminated soil /
- Fe-Mn oxide /
- biochar /
- stabilization /
- leaching toxicity

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图 1 修复后As的SPLP浸出浓度

Figure 1. Concentrations of As after remediation using synthetic precipitation leaching procedure

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图 2 修复后土中As的生物有效性

Figure 2. Bioavailability of As after remediation

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图 3 修复后土样的pH

Figure 3. pH of treated soil

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图 4 修复后土中As的形态分布

Figure 4. Speciation of As after remediation

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图 5 BC、FMO和FMO-BC的SEM和EDS图谱

Figure 5. SEM and EDS images of BC, FMO and FMO-BC

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图 6 修复前后FMO-BC的XRD图谱

Figure 6. XRD patterns of FMO-BC before and after remediation

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图 7 修复土样前后FMO-BC的XPS图谱

Figure 7. XPS spectra of FMO-BC before and after remediation

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表 1 原土中的金属元素含量

Table 1 Metal contents in original soil (单位: mg·kg^-1)

金属元素 Ca Mg Al As Fe Mn

含量 9650 2470 67700 8.9 13100 2470

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