生物炭负载羧甲基纤维素钠稳定化纳米铁对水中六价铬的去除  

Removal of hexavalent chromium from water by biochar supported with sodium carboxymethyl cellulose-stabilized nano-iron

作　　者：闫奇 郑乾送 周江敏[1] 陶月良[1] 杨旭 袁孝康 陈华林[1] YAN Qi;ZHENG Qiansong;ZHOU Jiangmin;TAO Yueliang;YANG Xu;YUAN Xiaokang;CHEN Hualin(College of Life and Environmental Sciences,Wenzhou University,Wenzhou 325035,China)

机构地区：[1]温州大学生命与环境科学学院,温州325035

出　　处：《环境工程学报》2020年第3期579-587,共9页Chinese Journal of Environmental Engineering

基　　金：浙江省国际产业联合研发计划基金资助项目(2019C54002);浙江省自然科学基金资助项目(LY17D010003)。

摘　　要：利用液相还原法,通过先负载再包裹的方式制备了4种不同炭铁质量比的生物炭负载羧甲基纤维素钠稳定化纳米铁(BC-nZVI-CMC)材料,并将其用于对水中Cr(Ⅵ)的去除,使用扫描电镜、X射线衍射和傅里叶红外等技术对BC-nZVI-CMC的结构与性质进行了表征。结果表明:BC-nZVI-CMC具有较好的分散性,粒径为纳米级且被CMC完全包覆,抗氧化能力得到较大提升,可有效去除水中Cr(Ⅵ);投加1 g·L^-1的BC-nZVI-CMC对含有30 mg·L^-1的Cr(Ⅵ)去除率达99.83%;pH越小,越有利于BC-nZVI-CMC对水中Cr(Ⅵ)的去除,最高去除率可达100%;BC-nZVI-CMC的抗氧化能力明显高于商品纳米铁和生物炭负载纳米铁;含有8 g·L^-1 C/Fe=1∶1的BCnZVI-CMC对电镀废水中Ni、Zn、Cu、总铬、Cr(Ⅵ)的去除率可达39.60%、91.70%、100%、91.69%、100%。上述研究结果对水中Cr(Ⅵ)去除新技术的开发有重要的参考价值。In this study,biochars supported with sodium carboxymethyl cellulose-stabilized nano-iron(BCnZVI-CMC)with four different carbon-iron mass ratios was prepared though liquid-phase reduction method and first supporting and then covering way,which were used to remove Cr(Ⅵ)from water.The structure and properties of BC-nZVI-CMC were characterized by scanning electron microscopy,X-ray diffraction and Fourier transform infrared spectroscopy.The results showed that BC-nZVI-CMC presented good dispersion,nano-sized distribution,complete CMC coating and greatly improved anti-oxidation ability,it could effectively remove Cr(Ⅵ)from water.At the dosage of 1 g·L^-1 BC-nZVI-CMC,99.83% Cr(Ⅵ)could be removed from water with the initial concentration of 30 mg·L^-1.The lower the pH,the higher removal efficiency of Cr(Ⅵ)by BC-nZVICMC,and the highest removal efficiency could reach 100%.The anti-oxidation ability of BC-nZVI-CMC was significantly superior to that of commercial nano-iron and biochar-loaded nano-iron.At the dosage of 8 g·L^-1 BC-nZVI-CMC with C/Fe=1∶1,the removal efficiencies of Ni,Zn,Cu,total chromium and Cr(Ⅵ)in electroplating wastewater could reach 39.60%,91.70%,100%,91.69% and 100%,respectively.The result provides important reference for the development of new Cr(Ⅵ)removal technology from water.

关 键 词：生物炭 羧甲基纤维素钠 纳米铁 Cr(Ⅵ)去除 

分 类 号：X52[环境科学与工程—环境工程]