Preparation and visible photocatalytic properties of CdS modified by hexadecyltrimethylammonium bromide
The CdS catalysts modified with hexadecyltrimethylammonium bromide(CTMAB)were prepared by sodium sulfide and cadmium acetate as raw materials through hydrothermal synthesis method.The catalysts were characterized by XRD,FTIR,FESEM(EDS),UV-Vis DRS and methyl orange(MO)was degraded under visible light.The results showed that crystal structure of CdS after CTMAB modification was not destroyed,but the crystallinity was improved.Meanwhile,morphology of CdS was changed from lamellar structure to granular structure,and the surface was also organically modified.The band gap of modified CdS was slightly increased,but the adsorption and photocatalytic performance was greatly improved.The 0.3CdS catalyst showed the best photocatalytic activity,and the degradation rate of MO was about 14 times that of CdS,and the degradation rate was close to 100％under 100 min of visible light.Radical-Trapping and cycling experiments showed that h+,·OH and·O2- were abundant in the reaction system,and the catalytic activity of 0.3CdS decreased by about 43％after four cycles of photocatalytic reaction.
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维普
