蒙脱土负载硫化纳米零价铁降解有机污染物
SMECTITE-SUPPORTED SULFIDE NANOSCALE ZERO VALENT IRON FOR ORGANIC POLLUTANTS DEGRADATION
江皓文 1魏睿 2杨秀琼 3罗胜联 2喻恺2
作者信息
- 1. 北京航空航天大学空间与环境学院,北京 100191;南昌航空大学江西省持久性污染控制和资源循环利用重点实验室,南昌 330063
- 2. 南昌航空大学江西省持久性污染控制和资源循环利用重点实验室,南昌 330063
- 3. 江西省生态环境科学研究与规划院,南昌 330006
- 折叠
摘要
通过一步法合成了蒙脱土负载硫化纳米零价铁(CSZVI),使用TEM、BET、XRD、XPS、接触角测量仪对CSZVI的表面物化性质和材料结构进行表征,重点探究了 n(S)/n(Fe)对CSZVI去除有机污染物的影响.结果表明:蒙脱土负载有效抑制了硫化纳米零价铁(SnZVI)的团聚并降低了其粒径;在m(蒙脱土)/m(铁)=5时,CSZVI表现出最高的反应活性,在15 min内对氟苯尼考(FF)的降解效率达到100％;n(S)/n(Fe)为0.112时,CSZVI对2,4-二硝基甲苯(DNT)、对硝基苯酚(PNP)、FF、氯霉素(CAP)均表现出最高的反应活性,随着n(S)/n(Fe)增加,反应活性均表现出下降趋势;与纯水相相比,在V(水)/V(乙醇)=7∶3的共溶剂体系中,随着n(S)/n(Fe)增加其对相对亲水的PNP产生的抑制作用增大,而对相对疏水的FF所产生的抑制作用减小.研究结果证明,n(S)/n(Fe)增加会增强CSZVI的表面疏水性,从而提升对疏水污染物降解效率,降低对亲水污染物降解效率.
Abstract
A series of smectite-supported sulfidized nanoscale zero-valent iron(CSZVI)was synthesized by a one-step method.The surface physicochemical properties and material structure of CSZVI were characterized using TEM,BET,XRD,XPS,and contact angle meter,focusing on the effect of the n(S)/n(Fe)on the removal of organic pollutants by CSZVI.The results showed that smectite effectively inhibited the aggregation and reduced the particle size of sulfidized nanoscale zero-valent iron(SnZVI);CSZVI exhibited the highest reactivity at m(smectite)/m(Fe)of 5,and the degradation efficiency of florfenicol(FF)reached 100％within 15 min;at a S/Fe molar ratio of 0.112,CSZVI exhibited the highest reactivity toward 2,4-dinitrotoluene(DNT),p-nitrophenol(PNP),florfenicol(FF),and chloramphenicol(CAP),and the reactivity of CSZVI decreased with the increase of n(S)/n(Fe)molar ratio;increasing n(S)/n(Fe)resulted in greater inhibition on the degradation of hydrophilic PNP and smaller inhibition on the degradation of hydrophobic FF in the cosolvent with V(water)/V(ethanol)=7∶3 than in the aqueous phase.The results demonstrated that an increase in n(S)/n(Fe)enhances the surface hydrophobicity of CSZVI,which increases the degradation efficiency for hydrophobic pollutants and decreases the degradation efficiency for hydrophilic pollutants.
关键词
纳米零价铁/蒙脱土/硫化改性/有机污染物/表面疏水性Key words
nanoscale zero-valent iron/smectite/sulfidized/organic pollutant/surface hydrophobicity引用本文复制引用
基金项目
国家自然科学基金面上项目(42177015)
国家重点研发计划(2022YFD1700802)
出版年
2024
NETL
NSTL
万方数据