SMECTITE-SUPPORTED SULFIDE NANOSCALE ZERO VALENT IRON FOR ORGANIC POLLUTANTS DEGRADATION
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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.
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Key words:
- nanoscale zero-valent iron /
- smectite /
- sulfidized /
- organic pollutant /
- surface hydrophobicity
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