使用红色花生衣提取液绿色合成铁纳米颗粒(Fe NPs)去除水中的Cr(VI):去除机制和废水处理初探  

Removal of Cr(VI)from water by green synthetic iron nanoparticles(Fe NPs):Mechanistic insights and wastewater treatment

作　　者：潘自斌 林玉满[1] 陈祖亮[1] PAN Zibin;LIN Yuman;CHEN Zuiang(School of Environmental Science and Engineering,Fujian Normal University,Fuzhou 350007)

机构地区：[1]福建师范大学环境科学与工程学院,福建350007

出　　处：《环境科学学报》2023年第3期127-137,共11页Acta Scientiae Circumstantiae

基　　金：福建省双创基金。

摘　　要：以花生(Arachis hypogaea)衣提取物为原料,合成粒径为(11.32±2.47)nm且表面富含有机质的铁基纳米颗粒(Fe NPs).利用傅里叶变换红外光谱(FTIR)、X射线衍射仪(XRD)、扫描电子显微镜能谱技术(SEM-EDS)对反应前后Fe NPs的主要成分及微观结构进行表征,发现反应后的Fe NPs表面均匀的分散着铬(Cr)及其配合物,表明六价铬(Cr(VI))被Fe NPs去除.其次,Cr(VI)的去除实验表明Fe NPs表面的有机物对Cr(VI)的去除具有促进作用,且在反应条件为:T=25℃、pH=4.7、Cr(VI)初始浓度为40 mg·L^(-1)、Fe NPs投加量为1.0 g·L^(-1),Cr(VI)的去除量最高为40 mg·g^(-1).Cr(VI)的去除过程符合准二级动力学模型和Langmuir等温模型(R2≥0.9999),表明此过程是单分子层吸附和以化学吸附为主.Fe NPs对电镀废水中Cr(VI)的去除率及总Cr的去除率分别为95.5%和83.6%.最后,提出Cr(VI)可能的去除机制包括还原、形成沉淀物(氢氧化铬及配合物)和化学吸附.In this study,iron-based nanoparticles(Fe NPs)have been green synthesized by peanut(Arachis hypogaea)skin extract,which produced Fe NPs in the size of(11.32±2.47)nm.The Fourier transform infrared spectroscopy(FTIR),X-ray diffraction(XRD)and scanning electron microscopy(SEM)coupled with energy-dispersive X-ray spectroscopy(EDS)were used to identify the main components of Fe NPs and their microstructures before and after removing hexavalent chromium(Cr(VI)).A uniform dispersion of Cr and its complexes on the surface of Fe NPs after their removing Cr(VI)were observed.In addition,a maximum Cr(VI)removal capacity(40 mg·g^(-1))by the Fe-NPs was achieved under optimal conditions:25℃,pH=4.7,40 mg·L^(-1) Cr(VI)and 1.0 g·L^(-1) dosage.Furthermore,the organic matter on the surface of Fe-NPs has been proven to enhance the removal of chromium,where the Fe NPs mediated reduction of Cr(VI)to less toxic Cr(III),and adsorption of Cr fitted the pseudo second-order kinetic model and Langmuir isotherm model(R2≥0.9999).Elimination efficiencies of Cr(VI)and total chromium were 95.5%and 83.6%,respectively,in electroplating wastewater containing various metal ions.Finally,the mechanism of removal Cr(VI)based on reduction,precipitates(chromium hydroxide and complexes)and chemical adsorption,was proposed.

关 键 词：CR(VI) 协同去除 铁纳米颗粒 去除机制 废水处理 固废资源再利用 

分 类 号：X703[环境科学与工程—环境工程]