摘要
Cr(Ⅵ)是土壤和水体中常见的有毒污染物,将Cr(Ⅵ )转化为毒性较低的Cr(Ⅲ)是常用而有效的治理方法.本文采用褐铁矿对水中Cr(Ⅵ )进行处理研究,考察了褐铁矿投加量、Cr(Ⅵ)初始浓度、pH值、反应温度、铁矿石粒径大小以及添加不同物质等因素对褐铁矿去除效果的影响.结果表明,褐铁矿对Cr(Ⅵ)有很好的还原去除效果,Cr(Ⅵ)去除效率随褐铁矿用量的增加而增大,随Cr(Ⅵ )初始浓度的增加而减小,pH值越低越有利于反应的进行.铁矿石颗粒的直径越小,比表面积越大,也对反应越有利,而温度对Cr(Ⅵ)的去除影响不大.100目的褐铁矿颗粒去除Cr(Ⅵ )的能力为7.77mgCr(VI)/g.使用褐铁矿不仅可以将Cr(Ⅵ)还原为Cr(Ⅲ),还能将Cr(Ⅵ )彻底从水中去除.
Hexavalent chromium （Cr（Ⅵ）） is a common and toxic pollutant in soil and wastewater. Reduction of the mobile Cr（Ⅵ） to less mobile and less toxic Cr（Ⅲ） is a solution for decontamination of industrial effluents. In this study, the reduction of hexavalent chromium in aqueous solutions by limonite was investigated. The influences of limonite addition, initial Cr（Ⅵ） concentration, pH value, reaction temperature, the size of ironstone particles and other ions were tested in batch experiments. The results indicated that the removal efficiency increases with the increase of iron stone addition, but decreases with the increase of initial Cr（Ⅵ） concentration. Low pH value could accelerate the rate of Cr （Ⅵ） removal. The smaller the ironstone particles are, the higher are their surface areas, the faster are the reaction rates. Temperature have no influences on this reaction. The reduction capacity of limonite was found to be 7.77 mg Cr（Ⅵ）/g. Limonite can not only reduce Cr（Ⅵ） to Cr（Ⅲ）, but also remove Cr（Ⅵ） completely from water.
出处
《浙江大学学报（理学版）》
CAS
CSCD
北大核心
2008年第6期659-663,667,共6页
Journal of Zhejiang University（Science Edition）
关键词
六价铬
去除
重金属
褐铁矿
hexavalent chromium
reduction
heavy metal
limonite
