表面活性剂改性SiO2/FeS纳米复合材料对镉污染的修复研究
Surfactant-modified SiO2/FeS nanocomposites for remediation of cadmium pollution
刘鸿钰 1吕华港 1张闻 1江钧 1李小红 2薛生国1
作者信息
- 1. School of Metallurgy and Environment,Central South University,Changsha 410083,China;Chinese National Engineering Research Center for Control&Treatment of Heavy Metal Pollution,Central South University,Changsha 410083,China
- 2. Engineering Research Center for Nanomaterials,Henan University,Kaifeng 475004,China
- 折叠
摘要
本文以SiO2为载体和以CMC和SDBS及两者复配修饰得到硫化亚铁浆剂,发现CMC/SDBS 1:3质量比修饰SiO2/FeS(表活剂和FeS质量比为1:1)的分散性和抗氧化性的效果可双向提高.在研究材料中,CMC/SDBS 1:3复配修饰SiO2/FeS浆剂的粒径最小(D50=0.66 μm)、Zeta电位绝对值最大(值达到30 mV以上).SiO2/FeS-CMC/SDBS 1:3对镉污染溶液修复效果好,且Cd(Ⅱ)主要通过离子交换和化学沉淀作用形成CdS和CdSO4产物(产物形态稳定).在空气环境和氮气环境中,SiO2/FeS-CMC/SDBS 1:3对镉的吸附量差距不大,30 d达到158 mg/g左右.特别地,在修复低浓度镉污染时,SiO2/FeS-CMC/SDBS 1:3的吸附量比SiO2/FeS-CMC和SiO2/FeS-SDBS的吸附量大,且没有酸化风险.本研究揭示了CMC和SDBS复配修饰SiO2/FeS分散稳定性的提高及其在镉污染地下水修复中的应用,为Cd污染地下水原位修复提供科学依据.
Abstract
To improve the remediation and antioxygenic properties of ferrous sulfide(FeS)nanomaterials toward heavy metals is the focus of current research.This study employed a combination of sodium carboxymethylcellulose(CMC)and sodium dodecyl benzene sulfonate(SDBS)for the modification of FeS nanomaterials supported by porous silicon(SiO2/FeS)to serves as an efficient amendment for cadmium pollution.The optimized slurry with the mass ratio of CMC/SDBS to be 1:3 showed enhanced dispersion and antioxidant effects on SiO2/FeS(the mass ratio of surfactant to FeS was 1:1).This formulation exhibited the smallest particle size(D50=0.66 μm)and the highest absolute Zeta potential values exceeding 30 mV.Also,the obtained products demonstrated effective remediation of cadmium-contaminated solutions,with Cd(II)primarily forming stable CdS and CdSO4 products through ion exchange and chemical precipitation.The adsorption capacity of SiO2/FeS-CMC/SDBS 1:3 for cadmium in air and nitrogen was remained during 30 d,reaching about 158 mg/g.Notably,under low concentration Cd contamination,the adsorption capacity of SiO2/FeS-CMC/SDBS 1:3 exceeded that of SiO2/FeS-CMC and SiO2/FeS-SDBS without acidification risk.In summary,this research highlights the improved remediation and antioxygenic properties achieved through CMC and SDBS co-modification of SiO2/FeS,providing a new amendment for Cd remediation.
关键词
表面活性剂/nFeS/镉/修复机理/抗氧化Key words
surfactant/ferrous sulfide nanomaterials/cadmium/remediation mechanism/antioxygenic property引用本文复制引用
基金项目
国家重点研发计划(2019YFC1803603)
湖南省自然科学基金(2024JJ4061)
Fundamental Research Funds for the Central Universities of Central South University,China(2023ZZTS0517)
出版年
2024
NETL
NSTL
万方数据