Modification And Desulfurization Research Of Halloysite Nanotubes

Halloysite are a plentiful and cheap natural mineral nanotube material,it has great value of application to develpope this nanotube to replace the artficial nanotubes such as carbon nanotubes.Halloysite is a good model material about research of structural properties due to its distinctive nanosized tubular structure,large specific surfce area,good chemical and thermal stability.Baesd on the distinctive nanosized tubular structure,we use different metals and organic compounds to modify halloysite nanotubes and study their desulfurization performance;Use X-Ray diffractometer,infrared spectroscopy,transmission electron microscopy and N2 adsorption-desorption to comprehensive analyse the structural properties,obtain the following results.This paper found that the modification of metal on halloysite nanotubes didn't affect its basic tubular structure,different metal modification lead to defferent desulfurization performance,nickel metal modified HNTs showed the best adsorption desulfurization performance;the metal loadings also influenced nanotubes' desulfurization performance,with load content increased,adsorbent desulfurization first increased and then reduced;The adsorption performane of Ni(10)/HNTs under different adsorption conditions was studied and found that the adsorption performance was best when the temperature is 30 °C,adsorption time is 3 hours,and adsorbent to oil ratio is 1:20,the adsorption capacity is about 9.42 mg/g;Pseudo –second –order model was found to explain the kinetics of adsorption process and the adsorption date were all consistent with Langmuir and Freundlich model.Different organics was inserted into the layers of halloysite nanortubes and found that the intercalating space of halloysite nanotubes was increased by orgnics intercalation;Stearic acid modified HNTs showed the best adsorption desulfurization performance,the adsorption capacity is about 9.04 mg/g when the temperature is 30 °C,adsorption time is 150 minutes,and adsorbent to oil ratio is 1:20;The study found that intercalating space and intrcalation rate are important factors to effect the adsorption performance.