蔗糖改性纳米铁对六价铬污染的模拟修复

Simulated Remediation for Cr(Ⅵ) Pollution with Sucrose-Modified Nanoscale Zero Valent Iron

在二维模拟装置中进行改性纳米铁原位修复模拟,观察是否形成原位反应带,并研究反应带对六价铬高浓度污染的修复效能.模拟实验结果表明:在六价铬污染晕中注入大量的蔗糖改性纳米铁浆液,可以形成有效的反应带.反应带对于高浓度六价铬的修复效能在最初的30 min内最好,六价铬去除效率达到91%;在4 h以后至反应的第187 h,去除率稳定保持在60%,且形成了较大面积的有效修复区域.反应带中六价铬还原后的产物为三价铬,且生成的三价铬可能在中性或偏碱性环境中自然形成沉淀.

In order to observe whether an in-situ reactive zone is formed and study the remediation efficiency for high concentration of Cr(Ⅵ)pollution,the in-situ reactive zone of modified nanosale zero valent iron was created in a two-dimensional simulation trough.The results of simulated experiments showed that a large amount of sucrose-modified nano-iron slurry is injected to form an effective reaction zone in the Cr(Ⅵ)pollution halo.The recovery efficiency of the reaction zone for high concentration of Cr(Ⅵ)is the best in the first 30 minutes,and the Cr(Ⅵ)removing efficiency is 91%.The removal rate remains at 60%stably after 4 hours to 187 hours of the reaction,with a large area of effective repair area formed.The Cr(Ⅵ)in the reaction zone is reduced by Cr(Ⅲ),and the formed Cr(Ⅲ)may naturally form a precipitate in a neutral or alkaline environment.