We improve the photocatalytic effect of Ag 2 S under visible light by using fullerene modified with Ag 2 S nanoparticles. Surface areas and pore volumes of the Ag 2 S-fullerene samples showed catastrophic decreases due to the deposition of Ag 2 S. The generation of reactive oxygen species was detected through the oxidation reaction from 1,5-diphenyl carbazide (DPCI) to 1,5-diphenyl carbazone (DPCO). It is found that the photocurrent density and the photocatalytic effect increase in the case with the modified fullerene. In comparison with the separate effects of Ag 2 S and fullerene nanoparticles, the photocatalytic effect of the fullerene modified with Ag 2 S composites is increased significantly due to the synergetic effect between the fullerene and the Ag 2 S nanoparticles.

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The sonocatalytic degradation of azo dyes; methyl orange (MO) and rhodamine B (RhB) were studied catalyzed by cadmium selenide (CdSe)-graphene in dark ambiance. The CdSe-graphene composites were prepared by simple hydrothermal method. The characterizations of composites were studied by X-ray diffraction (XRD), scanning electron microscope (SEM), transmission electron microscope (TEM), specific surface area (BET) and with energy dispersive X-ray (EDX). The UV-spectroscopic analysis of the dyes was done by measuring the change in absorbance. The degradation of the organic dyes was calculated based on the decrease in concentration of the dyes with respect to regular time intervals. The rate coefficients for the sonocatalytic process were successfully established and the reusability tests were done to test the stability of the used catalysts.

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