Abstract
High color and organic composition, the effluents from the textile dyeing and finishing industry, can be treated by photocatalytic oxidation with UV/TiO2. The objective of this study was to prepare a new photocatalytic system by coating nanosized TiO2particles on steel mesh support and using cold cathode fluorescent light (CCFL) irradiation at 365 nm in a closed reactor for the oxidation of azo dye C.I. Orange G (OG). Various factors such as reaction time, coating temperature, TiO2dosage, pH, initial dye concentration, and service duration were studied. Results showed efficient color removal of the OG azo dye by the photocatalytic system with TiO2-coated temperature at 150°C. The optimal TiO2dosage for color removal was 60 g m−2. An acidic pH of 2.0 was sufficient for photocatalytic oxidation whereas basic condition was not. The rate of color removal decreased with increase in the initial dye concentration. The TiO2-coated steel mesh can be used repeatedly over 10 times without losing the photocatalytic efficiency. Results of FTIR and IC indicated the breakage of N=N bonds, with sulfate as the major and nitrite and nitrate as the minor products, which implied degradation of dye molecules.
Highlights
Most dyestuffs from the effluent of textile dyeing and finishing industry are organic compounds with high color intensity, recalcitrant to conventional biological wastewater treatment, and of major environmental concerns [1,2,3,4]
It has been reported that photocatalytic processes such as UV-TiO2 system can be effective in treating dye wastewaters [14,15,16,17,18] except that when applied in suspension further separation of TiO2 particles is necessary
Orange G (OG) using a batch photocatalytic reactor in which the photocatalytic TiO2 particles were coated on steel mesh and cold cathode fluorescent lamp (CCFL) was used as the source of irradiation
Summary
Most dyestuffs from the effluent of textile dyeing and finishing industry are organic compounds with high color intensity, recalcitrant to conventional biological wastewater treatment, and of major environmental concerns [1,2,3,4]. It has been reported that photocatalytic processes such as UV-TiO2 system can be effective in treating dye wastewaters [14,15,16,17,18] except that when applied in suspension further separation of TiO2 particles is necessary. The CCFL lamp has thin and simple structure, is less temperature sensitive, and is easy to configure as well as it is brighter than the traditional mercury arc mercury lamp. It is more durable than other light sources. CCFL light is time-saving and less cost which is used broadly in computer products and applications such as liquid crystal display (LCD) backlight displays, PC case lights, and scanners, photocopy machines, industry machines such as appliance lighting, automotive fittings such as dashboard backlights, decoration light, advertisement such as signage board, exit light, and light box, and decoration such as indoors light and HO
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