SMECTITE-SUPPORTED SULFIDE NANOSCALE ZERO VALENT IRON FOR ORGANIC POLLUTANTS DEGRADATION
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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