Microwave-assisted synthesis of Zn x Cd1−x S–MWCNT heterostructures and their photocatalytic properties
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The multi-walled carbon nanotubes (MWCNTs) wrapped with hexagonal wurtzite Zn x Cd1−x S nanoparticles with a uniform and small diameter have been prepared to form Zn x Cd1−x S–MWCNT heterostructures by microwave-assisted route using Zn(Ac)2, Cd(NO3)2, and thioacetamide as the reactants. The heterostructures have been characterized by X-ray powder diffraction, scanning and transmission electron microscopy, high-resolution transmission electron microscopy, photoluminescence (PL) and PL excited lifetime. Despite the analogous size and configuration, the Zn x Cd1−x S–MWCNT (x = 0, 0.2, 0.5, 0.8, 1) with different Zn concentration exhibit composition-dependent absorption properties in the visible zone. The PL peak positions of Zn x Cd1−x S–MWCNT change gradually from ZnS–MWCNT to CdS–MWCNT. The Zn x Cd1−x S–MWCNT shows different photocatalytic activity towards the photodegradation of fuchsin acid under visible light illumination, photocatalytic activity of the Zn x Cd1−x S–MWCNT decreases gradually with the increase in the Zn concentration, the Zn0.2Cd0.8S–MWCNT possessed the best photocatalytic activity. After recycling thrice, the photocatalysts still have about 85% efficiency.
KeywordsZnCdS nanoparticles Photocatalytic activity Carbon nanotubes Microwave irradiation Semiconductors
We thank Anhui Provincial Natural Science Foundation (No. 070414179) and National Natural Science Foundation (No. 20901003) of the People’s Republic of China for financial support.
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