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Synthesis of Zn x Cd1–x S Solid Solution Porous Spheres as Efficient Visible-Light Driven Photocatalysts

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A series of Zn x Cd1–x S (ZCS) solid solution photocatalysts (x = 0.0, 0.33, 0.5, 0.67, 0.8 and 1.0) was directly fabricated by a simple wet chemistry route for the first time. The results revealed that the as-prepared ZCS solid solutions had wurtzite structure with various chemical compositions. With increasing Zn content, the ZCS morphology transformed from irregular aggregates to porous spheres accompanied by the reduction and homogenization of building block sizes; the band gaps were continuously adjusted from 2.2 to 3.1 eV; the specific surface area (AAS) increased from 4.2 to 93.3 m2/g. The photocatalytic activities in degradation of refractory reactive brilliant red (X3B) under visible light irradiation were also dependent on the photocatalyst compositions and all showed much higher activity than that of commercial product CdS (CP-CdS). Among them, the sample Zn0.8Cd0.2 S, with the lowest content of Cd, exhibited the highest photoactivity. The higher activity of Zn0.8Cd0.2 S may be attributed to the synergistic effect of its demonstrated doping levels of N species, appropriate band gap and the special porous spherical morphology. No apparent deactivation was observed for N-doped Zn0.8Cd0.2 S after being reused for six times.
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Document Type: Research Article

Publication date: September 1, 2013

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  • Science of Advanced Materials (SAM) is an interdisciplinary peer-reviewed journal consolidating research activities in all aspects of advanced materials in the fields of science, engineering and medicine into a single and unique reference source. SAM provides the means for materials scientists, chemists, physicists, biologists, engineers, ceramicists, metallurgists, theoreticians and technocrats to publish original research articles as reviews with author's photo and short biography, full research articles and communications of important new scientific and technological findings, encompassing the fundamental and applied research in all latest aspects of advanced materials.
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