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Semiconductor photocatalysts for its photovoltaic conversion, air purification, sterilization deodorant, wastewater treatment and other unique features have attracted much attention researchers, the use of nano-semiconductor materials photocatalytic water splitting and degradation of organic pollutants is the direct use of solar energy, green technology, with wide range of applications, but a single semiconductor material factors such as the impact of the barrier so that the photocatalytic efficiency is not high, and the composite nano-semiconductor materials can overcome these shortcomings, therefore, became the preparation of nano semiconductor composite photocatalytic efficiency studies to improve hotspot. This paper studies the \/ zinc oxide nanocomposites, depth and optimized preparation conditions, the use of transmission electron microscopy, scanning electron microscopy, electron spectroscopy, X-ray diffraction analysis, thermogravimetric - differential thermal analysis, IR, UV - visible absorption spectroscopy and other means particle structure, morphology and properties were characterized and represents methyl orange as organic composites were studied photocatalytic properties. To metallic copper and zinc oxide as raw material, the air as the oxidant, inexpensive ammonia as the complexing agent, ammonium bicarbonate as precipitant, using uniform oxide ligands were prepared by co-precipitation of nano-basic copper carbonate and basic zinc carbonate precursor body, and dried to obtain a good dispersion calcining nano copper oxide / zinc oxide composite particles. Study of water release, reaction temperature, reaction time and precursor calcination temperature and calcination time on the copper oxide / zinc oxide nanocomposites were determined as optimal preparation conditions, and to explore the product's grain growth kinetics its photocatalytic properties. Cadmium and zinc nitrate as raw materials, inexpensive ammonia as the complexing agent, thiourea, and ammonium bicarbonate were cadmium and zinc ion precipitant, homogeneous precipitation using two prepared with a range of different sulfide Content of CdS / ZnO nanocomposites, the composite material is composed of cubic and hexagonal hexagonal zinc oxide sulfide, of which the CdS particles are coated zinc oxide particles and sandwiched, thus reducing corrosion of CdS light. The system has a strong composite absorption of visible light, it has a strong photocatalytic activity, of methyl orange good degradation. Through the two semiconductor composite photocatalytic performance comparison, combined with semiconductor photocatalysis mechanism is proposed based on the relative level structure of a semiconductor to determine the initial semiconductor optical absorption properties of composite materials, and thus the semiconductor composites provide a theoretical basis for . Developed \
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