| 杨岱宗,尹彩流,余辉,李西西,臧龙飞,罗明科.非金属材料对水-沉积物中镉的阻隔机制[J].农业环境科学学报,2025,44(7):1825-1835. |
| 非金属材料对水-沉积物中镉的阻隔机制 |
| Stabilization mechanism of non-metallic materials on cadmium in water-sediment environment |
| 投稿时间：2024-09-24 |
| DOI：10.11654/jaes.2024-0797 |
| 中文关键词: 非金属材料 生物炭 湖泊沉积物 镉 磷 |
| 英文关键词: non-metallic materials biochar lake sediments cadmium phosphorus |
| 基金项目:国家自然科学基金青年科学基金项目（42407513） |
| 作者 | 单位 | E-mail | | 杨岱宗 | 广西高校环境友好材料及生态修复重点实验室, 广西先进结构材料与碳中和重点实验室, 材料与环境学院, 广西民族大学, 南宁 530105
中国环境科学研究院, 北京 100012 | | | 尹彩流 | 广西高校环境友好材料及生态修复重点实验室, 广西先进结构材料与碳中和重点实验室, 材料与环境学院, 广西民族大学, 南宁 530105 | | | 余辉 | 中国环境科学研究院, 北京 100012 | | | 李西西 | 中国环境科学研究院, 北京 100012 | | | 臧龙飞 | 中国环境科学研究院, 北京 100012 | | | 罗明科 | 中国环境科学研究院, 北京 100012 | luo.mingke@craes.org.cn |
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| 中文摘要: |
| 为探明典型非金属材料高岭土（KL）、活性炭（AC）和生物质炭（BC）对水-沉积物中Cd阻隔作用的差异性，本文研究了3种材料对“上覆水-间隙水-沉积物”系统中理化因子（pH、ORP）、营养物质[总有机碳（TOC）、总磷（TP）、总氮（TN）]及Cd（浓度、形态、生物毒性）的影响。结果表明：3种材料均提高了上覆水的氧化性，降低了水相中TOC和Cd（Ⅱ）的浓度，其中，AC使系统中营养物质沉积释放程度最大；Spearman相关性分析得出材料比表面积及总孔体积与pH、TOC呈负相关，间隙水总磷浓度与Cd生物毒性呈极显著正相关；非金属材料一是改变了泥水界面不同理化因子（如pH、TP），间接降低了Cd（Ⅱ）的迁移性，二是材料直接吸附上覆水中不稳定组分Cd，使其转化为更稳定的氧化态。其中BC因独特的性质，促进还原态Cd与P转换为更稳定的Cd1.25Ca0.75（P2O7）晶体，并使沉积物中Cd的残渣态占比提高了12个百分点，其钝化效果最好。研究表明，从Cd的吸附效果、钝化效果及稳定性综合得出BC>AC>KL，其中，AC对水-沉积物环境的理化性质影响最大。 |
| 英文摘要: |
| In order to investigate the differences of typical non-metallic materials kaolin（KL）, activated carbon（AC）and biochar（BC）on the stabilization of Cd in water-sediment. This article studied the effects of three materials on the physicochemical factors（pH, ORP）, nutrients[total organic carbon（TOC）, total phosphorus（TP）, total nitrogen（TN）] and Cd（concentration, form, biological toxicity）in the system of“overlying water-interstitial water-sediment”. The results showed that the materials all enhanced the oxidation of the overlying water and depressed TOC and Cd（Ⅱ）concentrations in the aqueous phase, with AC causing the greatest degree of nutrient deposition and release from the system. Spearman correlation analysis proved that the specific surface area and total pore volume of the material were negatively correlated with pH and TOC, the TP concentration in the interstitial water was super-significantly positively correlated with Cd biological toxicity. Firstly, non-metallic materials change different physicochemical factors（such as pH, TP）at the sediment-water interface, indirectly reduce the migration of Cd（Ⅱ）, Secondly, the materials directly adsorb the unstable components of Cd in the overlying water, transforming it into a more stable oxidizable state. Among them, BC, due to its unique characteristic, promotes the transformation of reducible state Cd with P to more stable Cd1.25Ca0.75（P2O7）crystals. Furthermore, it enhances the residue state of Cd in the sediments by 12 percentage points, which has the best passivation effects. In summary, the adsorption, passivation and stability of Cd derive BC>AC>KL, AC has the greatest effect on physicochemical characteristics in the water-sediment environment. |
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