Preparation of CdS Nanoparticles with Reverse Micelle Method and Photo-degradation of Malachite Green Dye

Cadmium sulfide(CdS) nanoparticles with efficient photocatalytic activity were synthesized using wa-ter/CTMAB/n-butyl alcohol/n-heptanes reverse micelle system.The particles exhibited various photocatalytic activi-ties with the different ω values(ω = [Water]/[CTMAB] = 25,35,50),and the optimal ω value was 25.Based on the X-ray diffraction(XRD) and transmission electron microscope(TEM) analysis,CdS nanoparticles were ascribed to the cubic sphalerite and the average size of CdS particle(ω=25) was about merely 9nm.Moreover,the ω values could di-rectly affect the particle size and electrical property of CdS nanoparticles by means of cyclic voltammetry(CV) and electrochemical impedance spectroscopy(EIS).Under visible light(λ≥420nm) irradiation,Malachite Green(MG) was used as a probe to investigate the effect of preparation conditions on photocatalytic activity of CdS nanoparticles.It can be concluded that MG could fade out within 70min and attain the 50% mineralization after 30h under visible light irradiation,and the degradation process mainly referred to the hydroxyl radical(-OH) and H2O2.