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Preparation and Photocatalytic Properties of Nano ZnO/Diatomite Composite Material

ZHANG Runhu1a,LI Li1b,XU Xiaojing,NING Mencui1a   

  1. 1a.Faculty of Chemical Engineering;b.Faculty of Environmental Engineering,Kunming Metallurgy College,Kunming 650033,China;
    2.Kunming Greenisland Environmental Technology Co,Ltd.,Kunming 650228,China
  • Received:2018-03-03 Online:2018-06-30 Published:2018-06-30

Abstract: Printing and dyeing waste water contains chemical components that are difficult to be biodegraded,and it is one of the more difficult wastewaters.Decolorization is the first problem to be solved in the treatment of printing and dyeing wastewater.The nano-ZnO/diatomite composite material was prepared by coprecipitatio nmethod.The adsorption and photo catalytic degradation properties of the composites on methylene blue were investigated in terms of dosage,contact time,organic dye concentration,pH value and temperature.The results show that the removal efficiency of methylene blue is better than that of the ordinary diatomite under the light conditions.Experiments show that under a certain intensity of UV lamp irradiation,when the dosage of material and organic dye solution ratio is 0.1g/100mL,the treatment efficiency is the best.The decolorization rate of the material in contact with the organic dye solution for 6h is about 50%,and the decolorization rate of the contact 24h is about 100%.The concentration,pH and temperature of the dye solution have a significant effect on the efficiency of the decolorization rate of the material.

Key words: nano-ZnO, diatomite, photo catalytic

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