Abstract

Cadmium sulfide (CdS) nanoparticles dotted on the surface of multiwalled carbonnanotubes (MWCNTs) have been synthesized by the polyol method. The as-preparedmaterials were characterized by x-ray powder diffraction, transmission electron microscopy,scanning electron microscopy, and Brunauer–Emmett–Teller adsorption analysis. Theresults indicate that CdS nanoparticles with diameter of 5–8 nm are thickly and uniformlycoated on the surface of the MWCNTs. The photodegradation of azo dye usingthese materials was evaluated by the degradation of Brilliant Red X-3B undervisible light. The coated nanotubes show higher photocatalytic activity thanboth CdS alone and a CdS/activated carbon sample; in addition, there is anoptimum content of MWCNTs. The presence of MWCNTs can also hamper thephotocorrosion of CdS. The mechanism for the enhancement of MWCNTs on theadsorption and photocatalytic property of CdS is investigated for the first time.

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