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| 生物炭基微胶囊缓释材料的制备及其强化氯代烃降解效果 |
| Preparation of biochar-based microcapsules for sustained-release materials and enhanced chlorinated hydrocarbon degradation effects |
| 投稿时间：2023-12-12 |
| DOI：10.13254/j.jare.2023.0807 |
| 中文关键词: 氯代有机物污染，生物炭，缓释碳源，微胶囊，强化生物还原脱氯 |
| 英文关键词: chlorinated organic matter contamination, biochar, slow-release carbon source, microcapsule, enhanced bioreductive dichlorination |
| 基金项目:国家自然科学基金项目（41877425，41401357）；上海市自然科学基金项目（21ZR1446800）；区域污染环境生态修复教育部重点实验室（沈阳大学）开放课题（KF2204）；国家环境保护水土污染协同控制与联合修复重点实验室开放基金项目（GHBK2022005）；上海市中央引导地方科技发展资金项目（YDZX20213100002003） |
| 作者 | 单位 | E-mail | | 李俊杰 | 上海师范大学环境与地理科学学院, 上海 200234 | | | 李锡林 | 上海师范大学环境与地理科学学院, 上海 200234 | | | 梁龙瑞 | 上海师范大学环境与地理科学学院, 上海 200234 | | | 石岩松 | 上海师范大学环境与地理科学学院, 上海 200234 | | | 李一苇 | 上海师范大学环境与地理科学学院, 上海 200234 | | | 李苏雅 | 上海师范大学环境与地理科学学院, 上海 200234 | | | 方逗逗 | 上海师范大学环境与地理科学学院, 上海 200234 | | | 钱嘉伟 | 上海师范大学环境与地理科学学院, 上海 200234 | | | 孟梁 | 上海师范大学环境与地理科学学院, 上海 200234
上海长三角城市湿地生态系统国家野外科学观测研究站, 上海 201722 | mengliang@shnu.edu.cn |
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| 中文摘要: |
| 强化厌氧生物降解是一种极具应用前景的氯代有机物污染地下水修复技术。本研究利用微胶囊技术，制备了一种以海藻酸钠为包埋剂、生物炭为负载基体、有机碳源和零价铁为有效成分的缓释修复材料，优化了材料制备条件并探究了其对地下水中氯代烃强化生物还原脱氯效果。结果表明，大豆油缓释碳性能最佳，可作为材料中长效有机碳源；微胶囊最佳包埋条件为海藻酸钠浓度（m∶V）2.5%、CaCl2溶液浓度（m∶V）6%、固化时间12 h；材料有效组分最佳质量百分含量（m∶m）为零价铁10%、大豆油45%和生物炭 10%。通过 FTIR、XPS、XRD等表征发现材料含有 C O、Fe O等官能团，证明零价铁和大豆油已成功负载于生物炭表面。优选微胶囊材料处理480 h后对地下水中1，1，1-三氯乙烷（1，1，1-TCA）的去除率达到95.76%，显著高于商业修复药剂，且可维持体系较低的氧化还原电位及中性pH环境。研究表明，本研究获得的生物炭基微胶囊缓释材料具有脱氯效率高、处理周期长、原料廉价易得、环境友好等特点，可作为一种理想的工农业氯代有机物污染地下水强化厌氧生物修复材料。 |
| 英文摘要: |
| Enhanced anaerobic biodegradation is a promising remediation technology for groundwater contaminated by organochlorine solvents. In this study, a microcapsule sustained-release material with sodium alginate as the embedding agent, biochar as the loading matrix, organic carbon source, and zero-valent iron as the active ingredients were prepared by micro-capsulation technology, and the preparation conditions of the material were optimized, and its effect on the enhanced bioreduction and dechlorination of chlorinated hydrocarbons in groundwater was explored. The results showed that soybean oil had the best slow-release carbon properties and could be used as a long-term organic carbon source in the materials. The optimal embedding conditions for microcapsules were 2.5% sodium alginate concentration（m∶V）, 6% CaCl2 solution concentration（m∶V）, and 12 h curing time, and the optimal mass percentage（m∶m）of the active components of the material was 10% zero-valent iron, 45% soybean oil, and 10% biochar. FTIR, XPS, XRD, and other characterizations found that the materials contained functional groups such as C O and Fe O, proving that zero-valent iron and soybean oil had been successfully loaded on the biochar surface. After 480 h of treatment, the removal rate of 1, 1, 1-TCA from groundwater reached 95.76%, which is significantly higher than that of commercial remediation agents, and could maintain a low oxidationreduction potential and neutral pH environment. The results of this study can provide an efficient and green enhanced reduction, dechlorination, and slow-release remediation material for the treatment of chlorinated agricultural soil and groundwater. |
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