2.中国环境科学研究院,北京 100012
1.School of Chemical and Environmental Engineering, China University of Mining and Technology (Beijing), Beijing 100083, China
2.Chinese Research Academy of Environmental Sciences, Beijing 100012, China
FeS纳米材料易团聚易氧化的特点,极大地限制了其工程应用。为此,选用羧甲基纤维素钠(CMC)、淀粉(ST)、瓜尔胶(GG)和海藻酸钠(SA)作为高聚物稳定剂,制得CMC-FeS、ST-FeS、GG-FeS和SA-FeS纳米材料,综合考察了4种改性FeS材料的稳定性、迁移能力及其对Cr(Ⅵ)的反应活性。结果表明,4种高聚物稳定剂主要以羧基通过双齿桥接的形式结合到颗粒表面,从而抑制了颗粒间的团聚。改性后的FeS纳米材料与裸露 FeS相比,FeS纳米颗粒具有更强的稳定性。改性FeS纳米材料在饱和多孔石英砂介质中的迁移能力明显提高,迁移能力随着注入浓度质量的增加、介质粒径的减小而降低。CMC-FeS、ST-FeS和SA-FeS较强的抗沉降性能和迁移能力主要与静电斥力和空间位阻效应的增加有关,对于GG-FeS,空间位阻和剪切稀化特性使其具有一定的稳定性和在多孔介质中良好的迁移能力。与裸露FeS相比,4种改性纳米材料对Cr(Ⅵ)的去除能力均有明显提高,分别提高了67.2%、66.8%、58.4%和67.0%。以上研究结果能够为FeS纳米材料在土壤和地下水的修复提供参考。
Iron sulphide (FeS) nanoparticles easily agglomerate and oxidize, which greatly limits their engineering applications. In this study, sodium carboxymethyl cellulose (CMC), ST, guar gum (GG), and sodium alginate (SA) were used as polymer stabilizers to prepare stable CMC-FeS, ST-FeS, GG-FeS and SA-FeS nanomaterials, and their stability, migration ability, and reactivity with Cr(Ⅵ) were comprehensively investigated. The results showed that the stabilizers bound to particle surfaces with the bidentate bridging via the carboxylic group, which could provide both electrostatic and steric repulsion to prevent particle aggregation. Compared with bare FeS, the modified FeS nanomaterials had stronger dispersion ability and stability, the migration ability of modified FeS nanomaterials in saturated porous silica sand media improved significantly. The migration ability of the four modified FeS nanomaterials decreased with the increase of the injection concentration mass and the decrease of the medium particle size. The strong anti-settling performance and migration ability of CMC-FeS, ST-FeS and SA-FeS were mainly related to the increase in electrostatic repulsion and steric hindrance effect. For GG-FeS, the characteristics of steric hindrance and shear thinning ensured a certain stability and good migration ability in porous media. Compared with bare FeS, the Cr(VI) removal capacity of the four types of modified nanomaterials improved significantly by 67.2%, 66.8%, 58.4% and 67.0%, respectively. The research results can provide theoretical guidance for the soil and groundwater remediation with FeS nanomaterials.
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未改性(CK)和改性FeS纳米颗粒的扫描电镜图
Scanning electron microscopy of bare and four types of modified FeS nanoparticles
未改性和改性FeS纳米颗粒的XRD、水动力学直径和Zeta电位
XRD patterns, hydrodynamic diameter and Zeta potential of unmodified and four types of modified FeS nanoparticles
FT-IR of unmodified and four types of modified FeS nanoparticles
Metal-carboxylate types (M: metal)
未改性和改性FeS纳米颗粒在24 h内的沉降情况
Sedimentation photographs of unmodified and modified FeS nanoparticles within 24 h
) in solution near the liquid surface with the settling time
未改性和改性FeS纳米颗粒在饱和石英砂中的穿透曲线
Breakthrough curves of unmodified and modified FeS nanoparticles in saturated quartz sand
不同注射质量浓度对改性FeS纳米颗粒在饱和多孔介质中迁移性能的影响
Effects of different injection mass concentrations on the migration of modified FeS nanoparticles in saturated porous media
不同粒径介质对改性FeS纳米颗粒在饱和多孔介质中迁移性能的影响
Effects of different size media on the migration of modified FeS nanoparticles in saturated porous media
Effects of different modified materials on Cr(Ⅵ) removal by FeS nanoparticles
Deposition rates and maximum migration distances of unmodified and modified FeS nanoparticles
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