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Preparation of Layered Copper Hydroxy Salts and Wet Hydrogen Peroxide Catalytic Oxidation of Oganic Wastewater

Author: ZhouXiang
Tutor: ZhanYuZhong
School: Zhengzhou University
Course: Applied Chemistry
Keywords: copper hydroxy phosphate copper hydroxy nitrate hydrogen peroxide catalytic decomposition azo dye
CLC: X703
Type: Master's thesis
Year: 2010
Downloads: 86
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Abstract

To degrade the organic wastewater of high concentration was one of the big problem for the treatment of polllution water. Biological and coagulation treatment were not the effctive technology for the degradation of organic wastewater. Wet hydrogen peroxide catalytic oxidation of organics gradually begains to be the top research topics, owing to its advantage such as rapid reaction rate, excellent treating performance, easier separation of catalysts from the reaction system. Moreover, the key points of wet hydrogen peroxide catalytic oxidation was the preparation of heterogeneous catalysts.As a novel phneol hydroxylate catalyst, Copper hydroxy phosphate can catalyze hydrogen peroxide to degrade organics and the catalytic mechanism was the hydroxyl radical reaction. In thiss study copper hydroxy phosphate can be synthesized by hydrothermal crystallization, direct precipitation, sol-gel, EDTA release and ethanol solvothermal method. The products prepared on mild reaction condition by hydrothermal crystallization and precipitation free of other crystals; but mostly possess other crystals by sol-gel and EDTA release methods. The produsts had been used for the catalytic degradation of methylene blue to research its catalytic property. The decolorization rate of copper hydroxy phosphate synthesized by hydrothermal method on methylene blue can reach to 67.8%, and the decolorization rate of copper hydroxy phosphate prepared by direct precipitation on methylene blue was less than 15%. The degradation effects of products prepared by sol-gel and EDTA release methods differentiate each other, but the product with excellent degradation effects on methylene blue was not target copper hydroxy phosphate.Copper hydroxy nitrate was firstly successful synthesized through ethanol solvothermal method. Compared with conventional precipitation method, it was easier to control the synthesis conditions of ethanol solvothermal method, and the product copper hydroxy nitrate had better activity and stable property and higher yields. Copper hydroxy nitrate catalyst had been used to degrade Direct Sky Blue 5B of high concentration The effects of pH value, the consumption amunts of catalyst and hydrogen peroxide, reaction temperature and initial concentration of water samples on the catalytic degradating reaction of Direct Sky Blue 5B had been investagated. The colority of removal rate of Direct Sky Blue 5B can reach 80% after reacting 30 minutes with copper hydroxy nitrate prepared by ethanol solvent method when pH value ranges from 3 to 10. To the Direct Sky Blue 5B of high concerntration more than 0.150 g/L, the colority of removal rate can still reach to 80% after reacting 30 minutes with copper hydroxy nitrate. The experiment results indicacte hydrogen peroxide had the max adding amounts. The degradation effciency of Direct Sky Blue 5B will not change beyong the max adding amounts of hydrogen peroxide, and the effects of degradation obtained from the adding of hydrogen peroxide through batch is better than adding of hydrogen peroxide one time. The consumption of hydrogen peroxide were much less in the process of degradation of Direct Sky Blue 5B by cpper hydroxy nitrate, which reduced the cost. Copper hydroxy nitrate has a fine catalytic activity to the degradation of and also a longer life. At the same time, copper hydroxy nitrate has a higher rate of removing COD of organic effluent, which make a steady foundation for the subsequent biological treatment. Copper hydroxy nitrate will dissolved out some Cu2+ in the degradation process and contrast test of copper nitrate showed that the catalytic degradation of copper hydroxy nitrate was mainly heterogeneous catalysis.

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CLC: > Environmental science, safety science > Processing and comprehensive utilization of waste > General issues > Wastewater treatment and utilization
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