磁铁矿/磁黄铁矿复合矿物强化电修复治理Cr(VI)污染性能及含铬产物分析  

Enhanced Electro-Remediation of Cr(VI)Contamination by Magnetite/Pyrrhotite Composite Mineral and Analysis of Cr-Containing Products

作　　者：周川野 姬翔 鲁安怀[1] 丁竑瑞[1] 葛潇 王长秋[1] 李艳[1] ZHOU Chuanye;JI Xiang;LU Anhuai;DING Hongrui;GE Xiao;WANG Changqiu;LI Yan(School of Earth and Space Sciences,Peking University,Beijing 100871,China)

机构地区：[1]北京大学地球与空间科学学院,北京100871

出　　处：《硅酸盐学报》2024年第10期3122-3130,共9页Journal of The Chinese Ceramic Society

基　　金：国家重点研发计划项目(2019YFC1805900)。

摘　　要：整合还原固定材料与电修复技术,是增强Cr(VI)污染治理效果的有效方法。利用磁铁矿/磁黄铁矿复合材料构建矿物强化电修复的Cr(VI)治理体系,研究Cr(VI)的去除效果,比较该治理体系与电修复体系的Cr(VI)返溶率,并利用Raman光谱仪、X射线衍射仪、环境扫描电子显微镜及能谱仪对含铬产物进行表征。结果表明:对Cr(VI)含量为350 mg/kg的污染模拟土壤,Cr(VI)去除率近100%,总铬(TCr)去除率可达96%;矿物强化电修复实验组中Cr(VI)返溶率降低54%以上;铬与铁元素的分布相关性高,铬以矿物相的形式稳定存在。实验证明,电修复中整合矿物可以提升铬的去除率并强化铬的矿化。本工作为长效稳定地修复Cr(VI)污染场地提供了新思路。Introduction Electrokinetic remediation is a promising method for Cr(VI)treatment.Electrokinetic remediation operates based on a low-intensity electric field across the soil,which mobilizes contaminants towards the electrodes.Some previous studies tried to improve the mobility and availability of contaminants for extraction.However,the technology faces some challenges such as interference from non-target contaminants.It is thus necessary to develop the electrokinetic remediation with other technologies like chemical agents and permeable reactive barriers.Some minerals can be used to remediate Cr(VI)due to their properties like surface effect and redox effect.The existing researches on minerals for Cr(VI)remediation mainly focus on zero-valent iron(ZVI)materials.ZVI usually requires loading materials to minimize agglomeration.In this paper,a magnetite/pyrrhotite composite material(i.e.,pyrrhotite naturally dispersed in magnetite)was introduced to the electrokinetic remediation systems,mitigating shortage of electron donors in Cr(VI)contaminants and stabilizing Cr in the form of Cr-containing minerals.The impacts of mineral filling position and potential gradient on the Cr(VI)remediation performance were investigated,and the Cr-containing products were analyzed.Methods The mineral enhanced electro-remediation devices consisted of acrylic reactors(length 100 mm,diameter 50 mm),and plate-shaped electrodes(length 80 mm,width 50 mm).The minerals were filled on the both sides or in the middle.The applied potential gradient was 0.2 V/cm or 0.4 V/cm,provided by a model CHI 1000C Electrochemical workstation.In the remediation process,the samples were taken at 12,24,36,48,72,96,120,144 h,and 168 h,respectively.The concentrations of Cr(VI)were determined by a model Thermo Fisher EVOLUTION 220 UV visible spectrophotometer based on the national standard GB7467-87.The total Cr(TCr)concentrations were determined by a model SPECTROBLUE SOP inductively coupled plasma optical emission spectrometer,in accordance with HJ 776-2015 met

关 键 词：磁铁矿/磁黄铁矿复合矿物 矿物强化作用 电修复 铬(VI)污染 

分 类 号：P579[天文地球—矿物学] X53[天文地球—地质学]