首页|表面活性剂改性SiO2/FeS纳米复合材料对镉污染的修复研究

表面活性剂改性SiO2/FeS纳米复合材料对镉污染的修复研究

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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。
Surfactant-modified SiO2/FeS nanocomposites for remediation of cadmium pollution
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.

surfactantferrous sulfide nanomaterialscadmiumremediation mechanismantioxygenic property

刘鸿钰、吕华港、张闻、江钧、李小红、薛生国

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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

Engineering Research Center for Nanomaterials,Henan University,Kaifeng 475004,China

表面活性剂 nFeS 镉 修复机理 抗氧化

国家重点研发计划湖南省自然科学基金Fundamental Research Funds for the Central Universities of Central South University,China

2019YFC18036032024JJ40612023ZZTS0517

2024

10.1007/s11771-024-5605-8

中南大学学报(英文版)
中南大学

中南大学学报(英文版)

CSTPCDEI
影响因子：0.47
ISSN：2095-2899
年,卷(期)：2024.31(4)
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