Study On Preparation Of Nano Copper Oxide And Its Performance Of Desulfurization And Regeneration

Sulfide malodorous gas, produced in the construction and operation of sewagetreatment plant, had been caused great attention for its serious hazard to peoplehealth and ecological environment. With widely used in removing sulfide malodor,metal oxide desulfurizer have a good desulfurization performance in hightemperature but bad at ambient temperature. So the research at ambient temperaturedesulfurization technology has a extensive market application foreground.Nano-CuO was prepared by orthogonal and signal factor experiments as a targetpollutant of H₂S with liquid phase precipitation method and solid reaction method.The nano-CuO sample prepared under optimal conditions(stirring time is20min,solution concentration is0.8mol/L, ratio of Cu²⁺/OH^-is1:2.8, stirring temperature is25℃, calcination temperature is300℃)for liquid phase precipitation exhibits thebest desulfurization performance with a H₂S breakthrough time of252min; while thenano-CuO sample prepared by solid reaction method with that of281min under itsown optimal conditions(no calcination, the ratio of Cu²⁺/OH^-is1:2.3). On the otherhand, characterization results from X-ray diffractometer（XRD）, transmission electronmicroscope（TEM）, Fourier transform infra-red（FT-IR）, X-ray photoelectron（XPS）,BET show that nano-CuO with small grain size and favorable dispersibility can beprepared by two different methods; and with a structure of more oxygen vacanciesand more uniform distribution of pore size, nano-CuO prepared by solid reactionmethod is in favor of H₂S adsorption.To research the regeneration performance of nano-CuO, the regenerationexperiments were carried out for the nano-CuO with high desulfurization activity.Results show that nano-CuO prepared by liquid phase method could be regenerated,it could be regenerated seven times in the condition of400℃and an oxygenatmosphere, and the cumulative breakthrough time of H₂S could reach880min;while regeneration performance of nano-CuO prepared by solid reaction method was poor, it could be used only once; characterization results from XRD et al. showedthat with the increase of regeneration times, the grain size of nano-CuO becamebigger, more inert sulfid accumulated on the surface, specific surface area and porevolume decreased, leading to a declining trend in desulfurization performance.In this study, nano-CuO prepared by two methods exhibits a high-efficiencydesulfurization performance to sulfide malodor and ability to be regenerated, itsdesulfurization performance is better than that of nano-zinc desulfurizer literaturereported（breakthrough time of150min）.