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Study on the Treatment Method and Mechanism for Industrial Wastewater of Pearl Pigment of Mica

Author: QuYi
Tutor: LeiShaoMin
School: Wuhan University of Technology
Course: Environmental Engineering
Keywords: TiO2 / mineral composite photocatalytic materials Photocatalytic Degradation Azo dye wastewater Adsorption
CLC: X788
Type: Master's thesis
Year: 2005
Downloads: 173
Quote: 1
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Abstract


Mica pearlescent pigments industrial wastewater containing azo dyes wastewater complex composition of its wastewater, COD Cr high concentration, chroma, salinity and pH; the BOD 5 / COD Cr value is low, generally in the 0.2 to 0.4; poor biodegradability. Currently, our mica pearlescent pigments industrial wastewater. Basically untreated emissions directly cause great harm to the environment. Kaolinite matrix, sol - gel prepared nano-TiO 2 / mineral composite photocatalytic materials, mica pearl pigment industrial wastewater containing azo dyes photocatalytic degradation seeking photocatalytic Degradation of Azo technology and conditions. The testing means spectrophotometer, XRD, IR, Raman, TEM, AFM characterization analysis of the experimental results. Under UV light, TiO 2 / mineral composite photocatalyst material azo dyes catalytic degradation experimental results show that the azo wastewater initial concentration of 40 mg / L, catalyst the dosage taken 1g/50ml wastewater, wastewater The initial pH of degradation 4h after decolorization rate reached 99.2%. Add the right amount of oxidation additives can accelerate the reaction rate. The catalyst can be recycled and reused after decolorization rate was 92.8%. Under natural light, TiO , 2 / mineral composite photocatalytic materials under acidic conditions azo dyes better decolorizing effect, degradation 6h decolorization rate was 94%. The course of the reaction of titanium dioxide photocatalytic degradation of azo dye: azo structure is first oxidized to form a new structure, the naphthalene ring structure is then oxidized small molecules containing substituted benzene ring structure, small molecules further catalytic mineralization become a colorless harmless the inorganics. Related conditions, there is a lack of effective testing methods to characterize the degradation intermediates generated. To compared with photocatalytic results, the study also used the calcination of limestone, tired the rectorite adsorption and chemical oxidation to deal with mica pearl pigment industrial wastewater containing azo dyes. Rectorite (74μm to 44μm) 400 ° C calcined 3h adsorption of azo wastewater 30min decolorization rate of 80.17%. Calcination of limestone (-100μm) 350 ℃ calcined 3h, adsorption of azo wastewater 15min decolorization rate was 96.98%. The Fenton process azo wastewater FeSO 4 0.7ml, H , 2 O 2 1.6ml, a pH of 4, the reaction 40min after decolorization rate up to 90%. The studies suggest that the nano TiO 2 / mineral composite photocatalytic materials, and the best photocatalytic effect of industrial effluents containing azo dyes mica pearlescent pigment. Mineral composite photocatalytic method is a highly efficient, energy-saving, easy to repeated use, no secondary pollution degradation is an ecological environment handle new technology. In this study, the technology practical theory and application. By contrast, under the same conditions, the the calcined limestone adsorbed better than rectorite. But the level of assay Whether decolorization indicators are just phase transition only need re-treatment.

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CLC: > Environmental science, safety science > Processing and comprehensive utilization of waste > Chemical industry,waste disposal and comprehensive utilization > Dyes, pigments and coatings industry
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