镉在不同氧化还原环境中的吸附解吸行为

李刚; 王聪; 解科峰; 伍杭; 牛宏

doi:10.19509/j.cnki.dzkq.tb20240369

镉在不同氧化还原环境中的吸附解吸行为

doi: 10.19509/j.cnki.dzkq.tb20240369

李刚^1,,
王聪¹,
解科峰²,
伍杭³,
牛宏^4, ,

1.
中南安全环境技术研究院股份有限公司，武汉 430000
2.
湖北省水利水电规划勘测设计院有限公司，武汉 430070
3.
湖北交通工程检测中心有限公司，武汉 430074
4.
中南民族大学资源与环境学院，武汉 430074

详细信息

作者简介:
李刚：E-mail：tonglin162@163.com

通讯作者:
E-mail：niuhong@scuec.edu.cn

中图分类号: X142
计量
- 文章访问数: 43
- PDF下载量: 4
- 被引次数: 0
出版历程
- 收稿日期: 2024-07-03
- 录用日期: 2024-09-19
- 修回日期: 2024-09-17
- 网络出版日期: 2025-02-18

Adsorption and desorption behavior of cadmium in different redox environments

LI Gang^1
,,
WANG Cong¹,
XIE Kefeng²,
WU Hang³,
NIU Hong^{4
, ,}

1.
Central-Southern Safety & Environment Technology Institute Co., Ltd., Wuhan 430000, China
2.
Hubei Water Resources and Hydropower Planning, Survey and Design Institute Co., Wuhan 430070, China
3.
Hubei Traffic Engineering Testing Center Co., Wuhan 430074, China
4.
College of Resources and Environmental, South-Central Minzu University, Wuhan 430074, China

More Information

Author Bio:
E-mail：tonglin162@163.com

Corresponding author: E-mail：niuhong@scuec.edu.cn

摘要

摘要:
地下氧化还原环境变化影响重金属在土壤中的吸附解吸，其影响机制尚不明朗。制备了不同氧化还原环境的蒙脱石，采用静态吸附实验及表征手段探究了不同氧化还原环境对镉吸附的影响。结果显示，还原态蒙脱石M-_RD和氧化态蒙脱石M-_OX氧化还原性变化不大，还原再氧化态蒙脱石M-_RO中发生的氧化还原反应最强烈，还原性逐渐下降。M-_RD吸附效果比M-_OX更好，尽管M-_RD再次氧化后，部分被吸附的Cd会被释放出来，但效果还是高于M-_OX。M-_RD再次接触氧气时，与氧气发生氧化反应，产出大量羟基自由基，而M-_OX和M-_RD几乎不产生羟基自由基。M-_RD再次氧化后，Fe(Ⅱ)-Fe(Ⅱ)-Fe(Ⅱ)-OH重排-OH弯曲振动特征吸收峰和Si-O四面体结构的特征吸收峰产生变动，表明蒙脱石发生了结构摄动，判断是其中的Fe(Ⅱ)失去电子被氧化成Fe(Ⅲ)，导致了蒙脱石结构的变化，使得蒙脱石比表面积、孔容和平均孔径均增大了，氧化还原条件变化影响其吸附性能，削弱了蒙脱石对Cd的吸附，导致吸附的Cd被再次释放。本研究揭示了地下环境氧化还原条件影响Cd吸附解吸的机理，可为氧化还原环境不断变化的土壤污染修复治理提供理论指导。
- 镉 /
- 氧化还原 /
- 吸附解吸 /
- 羟基自由基
Abstract: Objective
Changes in subsurface redox environment can affect the adsorption and desorption of heavy metals in soils; however, the underlying mechanisms of these effects remain unclear.
Methods
In this work, montmorillonite with different redox environments was prepared, and the effects of different redox environments on cadmium adsorption were assessed via static adsorption experiments and various characterization techniques.
Results
The results revealed minimal changes in the redox properties of both reduced montmorillonite M-_RD and oxidized montmorillonite M-_OX. The strongest redox reaction was observed in reduced reoxidized montmorillonite M-_RO, which showed a gradual decrease in the reducing properties. M-_RD exhibited superior cadmium adsorption compared to M-_OX; however, upon reoxidation, some adsorbed cadmium was released from M-_RD, although the adsorption was still more effective than in M-_OX. Re-exposure of M-_RD to oxygen initiated an oxidation reaction, generating numerous hydroxyl radicals, a phenomenon not observed in M-_OX or M-_RD alone.
Conclusion
Upon reoxidation of M-_RD, changes occurred in the characteristic absorption peaks associated with Fe(Ⅱ)-Fe(Ⅱ)-Fe(Ⅱ)-Fe(Ⅱ)-Fe(Ⅱ)-OH rearrangement-OH bending vibrations and the Si-O tetrahedral structure, indicating structural uptake of montmorillonite. This suggests that Fe(Ⅱ) in the structure lost electrons, transforming into Fe(Ⅲ), thereby causing a structural change in montmorillonite. These changes led to increased specific surface area, pore volume, and average pore size of montmorillonite, ultimately affecting its adsorption capacity. The altered redox conditions weakened the adsorption of Cd, causing its release from montmorillonite. Uncovering the mechanisms of cadmium adsorption and desorption affected by redox conditions in subsurface environments can provide theoretical insights for the remediation and treatment of soil pollution in dynamic redox settings.
- cadmium /
- redox /
- adsorption resolution /
- hydroxyl radicals.

HTML全文

图 1 蒙脱石吸附过程中Fe（Ⅱ）/Fe（Ⅲ）曲线

M_-OX. 氧化态蒙脱石；M_-RD. 还原态蒙脱石；M_-RO为还原再氧化蒙脱石；下同

Figure 1. Fe²⁺/Fe³⁺ curves during the adsorption by montmorillonite

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图 2 蒙脱石对Cd的吸附曲线

C₀表示吸附实验开始前Cd浓度；C表示吸附过程中Cd浓度

Figure 2. Adsorption curves of Cd by montmorillonite

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图 3 蒙脱石吸附过程中羟基自由基的变化曲线

Figure 3. Change curve of hydroxyl radicals during the adsorption by montmorillonite

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图 4 三种材料吸附前后的氮气洗脱附等温线

Figure 4. Nitrogen adsorption and desorption isotherms before and after adsorption of the three materials

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图 5 三种材料吸附前后的介孔孔径分布图

Figure 5. Mesoporous pore size distribution before and after adsorption of the three materials

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图 6 三种材料吸附前后的XRD谱图

Figure 6. XRD pattern before and after adsorption of the three materials

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图 7 三种材料吸附前的FTIR谱图

Figure 7. FTIR pattern before adsorption of the three materials

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图 8 M-_RO材料在吸附反应前、后的红外光谱图

Figure 8. FTIR pattern of M-_RO materials before and after the adsorption reaction

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表 1 三种材料吸附前后的比表面积、孔容及平均孔径

Table 1. Specific surface area, pore volume and average pore size before and after adsorption of the three materials

编号	比表面积/（m²·g⁻¹）	孔容/（cm³·g⁻¹）	平均孔径/nm
M-_OX⁰	14.619	0.052	4.129
M-_RD⁰	6.804	0.022	3.885
M-_RO⁰	9.522	0.037	4.154
M-_OX⁴⁸	16.050	0.027	3.884
M-_RD⁴⁸	4.059	0.037	3.933
M-_RO⁴⁸	7.618	0.038	4.126

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