羧甲基纤维素化零价铁除镍效能  

Nickel removal efficiency by carboxymethyl cellulose zero valent iron

作　　者：彭星 高燕 刘站 孙红卫 张礼知 申文娟 PENG Xing;GAO Yan;LIU Zhan;SUN Hongwei;ZHANG Lizhi;SHEN Wenjuan(College of Environmental Science and Engineering,Hunan University,Changsha 410082;School of Chemistry and Environmental Engineering,Wuhan Polytechnic University,Wuhan 430023;College of Chemistry,Central China Normal University,Wuhan 430079;School of Environmental Science and Engineering,Shanghai Jiao Tong University,Shanghai 200240)

机构地区：[1]湖南大学环境科学与工程学院,长沙410082 [2]武汉轻工大学化学与环境工程学院,武汉430023 [3]华中师范大学化学学院,武汉430079 [4]上海交通大学环境科学与工程学院,上海200240

出　　处：《环境科学学报》2024年第10期279-287,共9页Acta Scientiae Circumstantiae

基　　金：国家重点研发计划项目(No.2023YFC3708002)。

摘　　要：零价铁可渗透反应墙(mZVI-PRB)是一种被广泛应用的地下水重金属污染治理技术,但仍面临填料钝化堵塞和长效性差等问题.为解决以上难题,本研究通过机械化学法共球磨羧甲基纤维素和微米零价铁,制备了一种新型羧甲基纤维素化零价铁(CMC-mZVI),并研究了不同填充模式下CMC-mZVI除镍性能.研究结果表明,球磨法能将CMC以双齿桥接的方式负载到mZVI表面;相对于其它几种填充方式,活性炭(AC)与CMC-mZVI混合填充能显著延缓渗透速率降低及PRB钝化堵塞问题;AC和CMC-mZVI混合填充可有效提高二价镍离子的去除效率,其对含镍废水的去除效率是AC和mZVI填充的3倍.研究机理显示:羧甲基纤维素改性微米零价铁强化了铁离子的长效溶出,增强了新型零价铁吸附与还原镍离子的性能.为新型PRB设计提供了理论指导和技术支撑.The permeable reactive barrier technology using zero-valent iron(mZVI-PRB)is widely employed for the remediation of heavy metal contaminated groundwater.Challenges related to fill material passivation and the need for long-term effectiveness persist.To address these issues,this study utilized a mechanochemical method to prepare a novel carboxymethyl cellulose-modified zero-valent iron(CMC-mZVI)and investigated its performance under different filling modes for divalent nickel removal.The results indicate that ball milling effectively promotes bridging of CMC onto the mZVI surface.Mixed activated carbon and CMC-mZVI significantly delays the reduction in permeation rate and mitigates passivation issues,thus demonstrating the enhanced removal efficiency for divalent nickel.In this mode,the removal efficiency of nickel-containing wastewater is three times higher than that of mixed activated carbon and mZVI.Mechanistic insights reveal that CMC-mZVI enhances the long-term dissolution of iron ions and significantly improves the adsorption and reduction capabilities for nickel ions.This study provides valuable theoretical guidance and technical support for the design of novel PRB.

关 键 词：羧甲基纤维素 零价铁 可渗透反应墙(PRB) 二价镍 

分 类 号：X523[环境科学与工程—环境工程]