论文部分内容阅读
用经济、无害的固体废弃物硅微粉作载体,通过FeCl3与KBH4反应制备硅微粉负载纳米铁(silica fume supported Fe0 nanoparticles,SF-Fe0)。用X射线衍射、透射电镜、Fourier红外光谱对SF-Fe0进行了形貌与结构表征,并将其作还原剂用于地下水及土壤中六价铬Cr(Ⅵ)的去除。考察了离子强度和腐殖酸对SF-Fe0去除Cr(Ⅵ)效果及其在模拟土壤中的迁移特性的影响。结果表明:与未负载纳米铁相比,SF-Fe0对Cr(Ⅵ)的去除率升高了22.55%,且其在模拟土壤迁移能力增强;离子强度和腐殖酸对SF-Fe0去除Cr(Ⅵ)具有抑制作用,但腐殖酸能促进SF-Fe0迁移。
Silica fume supported Fe0 nanoparticles (SF-Fe0) was prepared by reaction of FeCl3 and KBH4 with an economical and harmless solid waste silica powder as carrier. The morphology and structure of SF-Fe0 were characterized by X-ray diffraction, transmission electron microscopy and Fourier infrared spectroscopy. The reductant was used to remove hexavalent chromium (Ⅵ) in groundwater and soil. The effects of ionic strength and humic acid on the removal of Cr (Ⅵ) from SF-Fe0 and its migration in simulated soils were investigated. The results showed that the removal rate of Cr (¢ ö) by SF-Fe0 increased by 22.55% compared with unloaded nanosized iron, and its migration in simulated soil was enhanced. The effect of ionic strength and humic acid on the removal of Cr Ⅵ), but humic acid can promote the migration of SF-Fe0.