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Qu W.,Kunming University of Science and Technology | Qu W.,State Key Laboratory Breed Base Of Complex Nonfer Metal Rsrc Cleaning Utilization In Yunnan Province | Qu W.,Key Laboratory of Unconventional Metallurgy Education Ministry | Jin W.,State Key Laboratory Breed Base Of Complex Nonfer Metal Rsrc Cleaning Utilization In Yunnan Province | And 6 more authors.
Advanced Materials Research | Year: 2012

ZnO/AC composite was prepared from spent catalyst of vinyl acetate synthesis by using conventional thermal treatment under CO 2 atmosphere. The final composite was obtained with the operating conditions of activation temperature of 950°C, activation time of 120min and the CO 2 flow rate of 600ml/min. The structure and surface properties of the ZnO/AC composite were observed and characterized by scanning electron microscope (SEM-EDX), X-ray diffraction (XRD), fourier transform infrared spectroscopy (FT-IR) and the UV diffuse reflectance spectra. It was found that the zinc acetate present in the spent catalyst is transformed to zinc oxide (ZnO) after thermal treatment. ZnO particles were well adhered and uniformly distributed onto the carbon surface, forming ZnO/AC composite. The thermal treatment of the spent catalyst gives rise to a material with excellent adsorptive and photocatalytic properties. © (2012) Trans Tech Publications, Switzerland. Source


Jin W.,State Key Laboratory Breeding Base | Jin W.,Key Laboratory of Unconventional Metallurgy | Jin W.,Engineering Laboratory of Applying Microwave Energy and Equipment Technology | Qu W.-W.,State Key Laboratory Breeding Base | And 12 more authors.
Journal of Nanoscience and Nanotechnology | Year: 2012

The process parameters of one step preparation of ZnO/Activated Carbon (AC) composite materials, from vinyl acetate synthesis spent catalyst were optimized using response surface methodology (RSM) and the central composite rotatable design (CCD). Regeneration temperature, time and flow rate of CO2 were the process variables, while the iodine number and the yield were the response variables. All the three process variables were found to significantly influence the yield of the regenerated carbon, while only the regeneration temperature and CO2 flow rate were found to significantly affect the iodine number. The optimized process conditions that maximize the yield and iodine adsorption capacity were identified to be a regeneration temperature of 950°, time of 120 min and flow rate of CO2 of 600 ml/min, with the corresponding yield and iodine number to be in excess of 50% and 1100 mg/g. The BET surface area of the regenerated composite was estimated to be 1263 m2/g, with micropore to mesopore ratio of 0.75. The pore volume was found to have increased 6 times as compared to the spent catalyst. The composite material (AC/ZnO) with high surface area and pore volume coupled with high yield augur economic feasibility of the process. EDS and XRD spectrum indicate presence of ZnO in the regenerated samples. Copyright © 2012 American Scientific Publishers. Source


Jin W.,State Key Laboratory Breed Base Of Complex Nonfer Metal Rsrc Cleaning Utilization In Yunnan Province | Jin W.,Key Laboratory of Unconventional Metallurgy Education Ministry | Jin W.,Engineering Laboratory of Applying Microwave Energy and Equipment Technology | Qu W.,State Key Laboratory Breed Base Of Complex Nonfer Metal Rsrc Cleaning Utilization In Yunnan Province | And 8 more authors.
Advanced Materials Research | Year: 2012

After being subjected to thermal treatment by microwave, a carbon-based spent catalyst from vinyl acetate synthesis has been proved to be a good precursor for the production of ZnO/activated carbon (AC) composites. Different operating activated times were found to have effect on the properties of the composites. As the activated time rises, the surface area of the activated carbon that is acting as the catalyst support increases due to the decomposition of the organic deposits that are clogging the porous structure. XRD was used to evaluate the transformation of zinc acetate to zinc oxide after thermal treatment. Both the iodine adsorption capacity and the yield of the resulting composites were calculated and SEM-EDX analysis was used to evaluate the changes in surface morphology. © (2012) Trans Tech Publications, Switzerland. Source

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