Abstract
Photoelectrocatalytic Oxidation (PECO) system prominently increases the migration of photoexcited charges, hinders the fast recombination of electron-hole, and increases the period of photogenerated holes. In this article, we constructed a novel PECO system to degrade textile industry wastewater by RuO2/IrO2/TaO2 coated titanium electrodes. The result shows that PECO treatment can effectively reduce the color and true color of the secondary pollutants present in the wastewater. It is confirmed that a synergistic effect exists between photocatalysis (PC) and electrocatalysis (EC). Moreover, we discussed the influence of pH, current density, electrolyte concentration, and stirring speed. The maximum decolorization efficiency of textile industry wastewater with a pH of 8.2 was found to be 96% under the optimum condition stirrer speed of 200 rpm, an electrolyte concentration of 0.05M, a current density of 15 mA.cm-2, and at a treatment time of 30 mins. The UV-Visible spectra confirm the degradation of textile industry wastewater.
Highlights
The widespread disposal of industrial wastewater containing organic dyes onto the land and water bodies led to serious contamination in many countries worldwide because of their toxicity and threat to human life and the environment (Thangamani et al 2007, Han et al 2009)
It is clear that varying the pH strongly affected color removal efficiency and reached 98% with sample wastewater’s original pH of 8.2 within 30 mins of the treatment process, while lower color removal was observed at higher pH
It can be concluded that the color removal efficiency of textile industry wastewater reached 98% within 30 mins, while lower color removal was observed at higher pH
Summary
The widespread disposal of industrial wastewater containing organic dyes onto the land and water bodies led to serious contamination in many countries worldwide because of their toxicity and threat to human life and the environment (Thangamani et al 2007, Han et al 2009). As the guidelines worldwide have become stringent, the effluents of textile and related industries have to be treated carefully before discharge This has resulted in a demand for environmentally friendly technologies to remove dyes from effluents (Rajabi et al 2016). It is clear that varying the pH strongly affected color removal efficiency and reached 98% with sample wastewater’s original pH of 8.2 within 30 mins of the treatment process, while lower color removal was observed at higher pH This is due to the oxidation and hydrolysis of chlorine yields hypochlorous acid (HOCl) or the hypochlorite ion (OCl–) depending on the solution pH 10. The photoelectrocatalytic degradation of textile industry dye wastewater was more efficient at the original pH of 8.2. PH is an important operational parameter determining the efficiency of photocatalytic removal of different pollutants in wastewaters (Hadjiltaief et al 2016)
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