| Textile and dyeing Wastewater is one of industrial Wastewater to be treated most difficulty. Wastewater of dyeing industry has complicated constituents, and usually contains many kinds of dyes .It has deep tinct and strong toxicity, and it is difficult to decompose it .Its pH value fluctuates widely, and it has high concentration and large water quantity .Titania (TiO2), which can decompose most organic pollutants into inorganic substances under UV irradiation, has become a hot research area because of its attractive application in the treatment of environmental pollutants. On the basis of resource, character and treatment approaches inside and outside country of printing and dyeing Wastewater, the mechanism, kinetic and technology of photocatalytic treating printing and dyeing Wastewater were studied on the laboratory scale in this paper. Experimental water includes analogue dye Wastewater and practical printing and dying Wastewater. Analogue dye Wastewater is reactive methylene blue solution. Practical printing and dyeing Wastewater is fetched from the final drain off following The Third Printing and Dyeing Factory in Shan'xi. Since the fixed catalysts are more practicable to the treatment of pollutants than the powder catalysts, we prepared TiO2 films supported on glass substrate by sol-gel method. The films were characterized by UV-visible spectrophotometer(UV-VIS), Infrared spectroscopy(IR) and SEM.The photocalytic activity of film was evaluated by the photodegradation of methylene blue , and the effects of various conditions on the photocatalytic characteristics were investigated. The experimental results were as follows:(1)TiO2 film: when addition of PEG 1%> the film layers of 5, calcinations temperature 500℃,the liquid discharge 90mL/min, initial pH 10.5,8W UV lamp as light source, The methylene blue (MB) in aqueous solution on TiO2 thin film was degrded 87.5% in 60 min . The results showed that the photocatalytic decolorization of MB can follow the first-order... |
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