| 毛晓宇,常星岚,李进军,王润得,顾雅洁,孙科,奚爽,许嘉雨.改性粉煤灰用于水体和土壤重金属污染修复研究[J].农业环境科学学报,2025,44(10):2676-2684. |
| 改性粉煤灰用于水体和土壤重金属污染修复研究 |
| Research on the remediation of heavy metal-contaminated water and soil by modified fly ash |
| 投稿时间：2024-10-14 |
| DOI：10.11654/jaes.2024-0871 |
| 中文关键词: 土壤污染修复 粉煤灰 固体废弃物 重金属 钝化剂 |
| 英文关键词: remediation of contaminated soil fly ash solid waste heavy metal passivator |
| 基金项目: |
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| 摘要点击次数: 1209 |
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| 中文摘要: |
| 本实验以粉煤灰为原料，开发重金属吸附剂和钝化剂，用于水体和土壤重金属污染修复。材料制备方法包括先后用酸和碱对粉煤灰进行处理制备酸-碱灰，用碱对粉煤灰进行处理制备碱灰，从粉煤灰骨架结构中提取Al、Fe、Si组分后再进行缩合反应制备重构灰。改性粉煤灰具有显著增强的孔隙结构和更多的活性位点。与原粉煤灰相比，酸-碱灰和碱灰对水体中Cd的吸附去除效率和对土壤中Cd的钝化效率显著提高。在Cd污染土壤钝化修复培养实验中，碱灰在7 d内即可实现土壤中Cd的可交换态占比下降约24%。重构灰具有固体酸的特征，可导致土壤的pH下降，Cd的可交换态占比反而上升了约23%。将粉煤灰进行低成本处理后用于污染修复，有望实现其大量消耗和资源化。 |
| 英文摘要: |
| Heavy metal contamination is one of the major water and soil environmental problems, and this study aimed to develop adsorbents and passivators from fly ash for the remediation of heavy metal pollution in water and soil. The material preparation methods included successive treatment of fly ash with acid and base to prepare so-called acid-base-treated fly ash, treatment of fly ash with base to prepare so-called base-treated fly ash, and preparation of reconstructed fly ash by extracting Al, Fe, and Si species from fly ash followed by condensation reaction. Modified fly ash had significantly enhanced porosity and more active sites. The adsorptive removal efficiency of Cd in water and the passivation efficiency of Cd in soil were significantly improved by acid-base-treated fly ash and base-treated one compared with the pristine fly ash. In the passivation remediation incubation experiment of Cd-contaminated soil, base-treated fly ash achieved a decrease of about 24% in the fraction of exchangeable Cd in soil within 7 days. In contrast, reconstructed fly ash had the characteristics of a solid acid, which led to a decrease in the pH of the soil and an inverse increase in the fraction of exchangeable Cd by about 23%. The use of fly ash for pollution remediation after a low-cost treatment holds promise for its mass consumption and resourcing. |
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