研究报告

  • 陈琼姗,周睿,许璋奕,李晗,严樟,冯春华.异化还原铁泥合成蓝铁矿/微生物复合材料固载铅研究[J].环境科学学报,2022,42(11):221-231

  • 异化还原铁泥合成蓝铁矿/微生物复合材料固载铅研究
  • Synthesis of vivianite/bacteria composites by dissimilatory reduction of iron sludge for lead immobilization
  • 基金项目:国家重点研发计划(No.2020YFC1808500)
  • 作者
  • 单位
  • 陈琼姗
  • 华南理工大学环境与能源学院,广州 510006
  • 周睿
  • 华南理工大学环境与能源学院,广州 510006
  • 许璋奕
  • 华南理工大学环境与能源学院,广州 510006
  • 李晗
  • 华南理工大学环境与能源学院,广州 510006
  • 严樟
  • 华南理工大学环境与能源学院,广州 510006
  • 冯春华
  • 华南理工大学环境与能源学院,广州 510006;工业聚集区污染控制与生态修复教育部重点实验室,广州 510006
  • 摘要:铁基复合材料具备优异的吸附/固载重金属性能,常用于钝化土壤中的铅,但常规的化学合成方法成本较为昂贵.为此,本文研发一种基于芬顿铁泥(Iron Sludge, IS)资源化利用的铅钝化材料,即通过异化铁还原菌(Shewanella Oneidensis MR-1)调控形成官能团丰富、比表面积大、表面负电荷量高的蓝铁矿/微生物复合材料(Vivi/MR-1),并研究其对铅的吸附固载性能.结果发现,Vivi/MR-1对铅的最大吸附容量为118 mg·g-1,高于MR-1(78 mg·g-1)、IS(61 mg·g-1)、Vivi(52 mg·g-1),且具有较宽的pH工作范围,受环境中其他金属离子的影响较小.结合X射线衍射仪(X-ray diffractometer, XRD)、傅里叶红外光谱(Fourier Transform Infrared Spectrometer, FTIR)等表征技术,确定吸附成矿、官能团络合是Vivi/MR-1钝化铅的主要机制.最后,通过土壤钝化实验进一步验证该复合材料对土壤中铅的固载性能,研究表明,Vivi/MR-1可将土壤中酸溶解态铅降低93.6%,极大地降低了铅的迁移性.
  • Abstract:Iron-based composites exhibit superior performance for adsorption/immobilization of heavy metals and are thus frequently used for passivating Pb in soil. However, the common method for their synthesis is of high cost. Herein, we propose the preparation of iron-based Pb-immobilized materials based on the utilization of iron sludge (IS) generated from Fenton process. Dissimilatory iron reduction of IS by Shewanella Oneidensis MR-1 was performed to generate the vivianite/bacteria (Vivi/MR-1) composites with abundant functional groups, large surface area, and high amounts of negative surface charge. It was revealed that the maximum adsorption capacity of Vivi/MR-1 for Pb was 118 mg·g-1, which was significantly higher than that of MR-1 (78 mg·g-1), IS (61 mg·g-1), and Vivi (52 mg·g-1). The Vivi/MR-1 for Pb adsorption worked efficiently in a wide pH range and slightly affected by the presence of other metal ions. The results of X-ray diffractometer (XRD) and Fourier Transform Infrared Spectrometer (FTIR) confirmed that adsorption mineralization and functional group complexation are the dominant mechanisms for Pb immobilization. Further experiments with the contaminated soil verified that the as-synthesized Vivi/MR-1 was effective in immobilizing Pb, with a substantial decrease (by 93.6%) in the acid-soluble Pb in the soil.

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