| 生物合成FeS及其稳定性柱迁移研究 |
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| 引用本文： | 任霞,严宁珍,刘璟.生物合成FeS及其稳定性柱迁移研究[J].岩石矿物学杂志,2024,43(1):117-124. |
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| 作者姓名： | 任霞 严宁珍 刘璟 |
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| 作者单位： | 西南大学 资源环境学院, 重庆 400716 |
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| 基金项目： | 国家重点研发计划 (2019YFC1803500);重庆市研究生科研创新项目(CYS21111); 西南大学《地质地貌学》专业核心课程建设(5240101941) |
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| 摘 要： | 金属纳米硫化亚铁(FeS)在重/类金属修复上具有广阔的应用前景。使用嗜酸性铁还原菌(JF-5)和硫酸盐还原菌(SRB)合成生物纳米FeS,探讨其自然沉降规律,并使用羧甲基纤维素钠(CMC)作为稳定剂,探讨CMC-FeS在石英砂柱中的迁移特性。结果表明,SRB和JF-5菌液在一定比例下混合即能生成纳米FeS,且当混合菌液中n(Fe)/n(S)=0.2时FeS生成量最多,颗粒物浓度达2 400 mg/L;FeS的自然沉降速率在0.1 % CMC溶液中得到有效减缓。对流扩散模型能很好地描述CMC-FeS悬浮颗粒在石英砂柱中的迁移行为,相比于纯水-FeS体系(R2=0.20),其模型相关性最高达0.85;在90、180和360 mL/h 这3种输入流速下,中等流速180 mL/h能够获得最佳渗透性,其渗透系数平均值为243.97 cm/h。实验结果表明,CMC-FeS的稳定性和迁移性较纯水-FeS均得到加强,可为土壤污染修复提供理论参考。
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| 关 键 词： | 生物合成FeS 沉降 柱迁移 |
| 收稿时间： | 2022/8/14 0:00:00 |
| 修稿时间： | 2023/9/5 0:00:00 |
Biosynthesis of FeS and its stability column migration study |
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| REN Xi,YAN Ning-zhen,LIU Jing.Biosynthesis of FeS and its stability column migration study[J].Acta Petrologica Et Mineralogica,2024,43(1):117-124. |
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| Authors: | REN Xi YAN Ning-zhen LIU Jing |
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| Institution: | School of Resources and Environment, Southwest University, Chongqing 400716, China |
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| Abstract: | Metal nano ferrous sulfide (FeS) has broad application prospects in heavy/metalloid remediation. Using Acidiphilum cryptum iron-reducing bacteria (JF-5) and sulfate-reducing bacteria (SRB) to synthesize biological nano-FeS, to explore its natural sedimentation law, and to use sodium carboxymethyl cellulose (CMC) as a stabilizer to explore CMC-FeS mobility characteristics in quartz sand columns. The results showed that the nano-FeS could be formed by mixing SRB and JF-5 bacterial solution with certain proportions, and when the n(Fe):n(S)=0.2 in the mixed bacterial solution, the amount of FeS was the largest with 2 400 mg/L of the particle concentration; the natural sedimentation rate of FeS could be effectively slowed down in 0.1% CMC solution. The convection diffusion model can well describe the migration behavior of CMC-FeS suspended particles in quartz sand columns. Compared with the purewater-FeS system (R2=0.20), the model correlation was as high as 0.85. Under three imput flow rates (90, 180 and 360 mL/h), the medium flow rate could obtain the best permeability, and the average permeability coefficient was 243.97 cm/h. Therefore, the stability and migration of CMC-FeS have been enhanced compared with the purewater-FeS, which may provide a theoretical reference for soil pollution remediation. |
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| Keywords: | biological FeS settlement column migration |
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