| 李鹏飞,杨婵,宋凤敏,赵航航,李巧云,齐文博,刘智峰.汉江上游表层沉积物对Mn（Ⅱ）/Cd（Ⅱ）的吸附和运移特征[J].农业环境科学学报,2025,44(6):1611-1622. |
| 汉江上游表层沉积物对Mn（Ⅱ）/Cd（Ⅱ）的吸附和运移特征 |
| Adsorption and transport characteristics of Mn（Ⅱ）/Cd（Ⅱ）by surface sediments in the upper reaches of the Hanjiang River |
| 投稿时间：2024-07-03 |
| DOI：10.11654/jaes.2024-0565 |
| 中文关键词: 沉积物 Mn（Ⅱ）/Cd（Ⅱ） 吸附实验 Hydrus-1D |
| 英文关键词: sediment Mn（Ⅱ）/Cd（Ⅱ） adsorption experiment Hydrus-1D |
| 基金项目:国家自然科学基金项目（22073059）；陕西理工大学秦巴生物资源与生态环境重点实验室“市校共建”科研专项（SXJ-2016）；陕西省自然科学基金项目（2024JC-YBQN-0252） |
| 作者 | 单位 | E-mail | | 李鹏飞 | 陕西理工大学化学与环境科学学院, 陕西 汉中 723001 | | | 杨婵 | 陕西理工大学化学与环境科学学院, 陕西 汉中 723001 | | | 宋凤敏 | 陕西理工大学化学与环境科学学院, 陕西 汉中 723001
秦巴生物资源与生态环境国家重点实验室(培育), 陕西 汉中 723001 | Sfm3297@163.com | | 赵航航 | 陕西理工大学化学与环境科学学院, 陕西 汉中 723001
秦巴生物资源与生态环境国家重点实验室(培育), 陕西 汉中 723001 | | | 李巧云 | 陕西理工大学化学与环境科学学院, 陕西 汉中 723001 | | | 齐文博 | 陕西理工大学化学与环境科学学院, 陕西 汉中 723001 | | | 刘智峰 | 陕西理工大学化学与环境科学学院, 陕西 汉中 723001
1. 陕西理工大学化学与环境科学学院, 陕西 汉中 723001 | |
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| 中文摘要: |
| 为研究汉江上游沉积物对Mn（Ⅱ）/Cd（Ⅱ）的吸附特性和运移规律，自汉江上游某干流段采集供试表层沉积物样品，采用静态-动态吸附方法，结合Hydrus-1D软件进行实验。批平衡吸附实验结果表明，沉积物对Mn（Ⅱ）/Cd（Ⅱ）的吸附主要受溶液pH的影响，随着溶液pH升高，沉积物对Mn（Ⅱ）/Cd（Ⅱ）的吸附量和吸附率均增大，当pH=7时，沉积物对Mn（Ⅱ）/Cd（Ⅱ）的吸附量与吸附率较为理想。在吸附过程中，沉积物对Mn（Ⅱ）/Cd（Ⅱ）的吸附行为更符合伪二级动力学模型，表明在Mn（Ⅱ）/Cd（Ⅱ）的吸附过程中起主要作用的是化学吸附，该模型下Mn（Ⅱ）的相关系数为0.999 9，Cd（Ⅱ）的相关系数为0.999 5，且通过吸附量和t1/2计算Mn（Ⅱ）/Cd（Ⅱ）在沉积物上的颗粒内扩散系数发现颗粒内扩散在吸附过程中也有重要作用。柱实验结果进一步说明，重金属在沉积物中的迁移主要受重金属浓度的影响，淋溶液中重金属浓度越大，穿透土柱和迁移完成的时间越短，出流液浓度峰值到达越早，Mn（Ⅱ）在40~300 mg·L-1不同浓度下穿透土柱和迁移完成的时间逐渐降低，最短为132 h和540 h，Cd（Ⅱ）在50~200 mg·L-1不同浓度下穿透土柱和迁移完成的时间逐渐降低，最短为94 h和556 h，表明重金属离子在水体沉积物中易迁移，造成水体中更深度的污染。沉积物吸附Mn（Ⅱ）/Cd（Ⅱ）前后的FT-IR表征结果表明，离子交换、络合反应和沉淀反应是沉积物吸附Mn（Ⅱ）/Cd（Ⅱ）的主要机制。批平衡吸附实验与柱实验的分析结果证实重金属离子在表层沉积物中易迁移，造成水体更深程度的污染，FT-IR与XPS表征分析发现Mn（Ⅱ）/Cd（Ⅱ）可与Fe氧化物和碳酸盐发生沉淀反应。 |
| 英文摘要: |
| In order to study the adsorption and migration characteristics of Mn（Ⅱ）/Cd（Ⅱ）in the sediments of the upper reaches of the Hanjiang River, the surface sediment samples were collected from a mainstream section of the upper reaches of the Hanjiang River. Theadsorption and migration characteristics of Mn（Ⅱ）/Cd（Ⅱ）in the sediments were studied by static-dynamic adsorption method and Hydrus-1D software. The results of batch equilibrium adsorption experiments showed that the adsorption performance of sediments on Mn （Ⅱ）/Cd（Ⅱ）was mainly affected by the pH of the solution. As the pH of the solution increased, the adsorption capacity and adsorption rate of sediments on Mn（Ⅱ）/Cd（Ⅱ）increased. When pH=7, the adsorption capacity and adsorption rate of sediments on Mn（Ⅱ）/Cd（Ⅱ） were ideal. In the adsorption process, the adsorption behavior of Mn（Ⅱ）/Cd（Ⅱ）by sediments is more in line with the pseudo-second-order kinetic model, indicating that chemical adsorption plays a major role in the adsorption process of Mn（Ⅱ）/Cd（Ⅱ）. In this model, the correlation coefficient of Mn（Ⅱ）is 0.999 9, and the correlation coefficient of Cd（Ⅱ）is 0.999 5.In addition, the intraparticle diffusion coefficient of Mn（Ⅱ）/Cd（Ⅱ）on sediments was calculated by adsorption capacity and t1/2, and it was found that intraparticle diffusion also played an important role in the adsorption process. The results of column experiments further showed that the migration of heavy metals in sediments was mainly affected by the concentration of heavy metals. With the increase of the concentration of heavy metal solution in the leaching solution, the shorter the time of penetrating the soil column and the completion of migration, the earlier the peak concentration of the effluent reached. The time of Mn（Ⅱ）penetrating the soil column and the completion of migration at different concentrations of 40-300 mg·L-1 decreased gradually, with the shortest of 132 h and 540 h. The time of Cd（Ⅱ）penetrating the soil column and the completion of migration at different concentrations of 50-200 mg·L-1 decreased gradually, with the shortest of 94 h and 556 h. It shows that heavy metal ions are easy to migrate in water sediments, resulting in deeper pollution in water. The results of FT-IR before and after the adsorption of Mn（Ⅱ）/Cd（Ⅱ）by sediments showed that ion exchange, complexation reaction and precipitation reaction were the main mechanisms for the adsorption of Mn（Ⅱ）/Cd（Ⅱ）by sediments. Combined with the results of batch equilibrium adsorption experiments and column experiments, it was confirmed that heavy metal ions were easy to migrate in surface sediments, causing deeper pollution of water bodies. FT-IR and XPS characterization analysis showed that Mn（Ⅱ）/Cd（Ⅱ）precipitated with Fe oxides and carbonates. |
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