Treatment of dye wastewater containing acid orange II using a cell with three-phase three-dimensional electrode

Mineralization of an azo dye Acid Red 14 by photoelectro-Fenton process using an activated carbon fiber cathode

“…As could be observed from these spectra, before the treatment, the absorption spectrum of AR14 in water was characterized by one main band in the visible region, with its maximum absorption at 514 nm, and by two bands in the ultraviolet region located at 220 nm and 322 nm. The peaks at 220 and 322 nm were ascribed to the absorption of the p-p* transition related to the naphthalene rings bonded to the -N N-group in the dye molecule [36,37]. The band in the visible region was attributed to the chromophore-containing azo linkage of the dye molecules in solution [38].…”

Electroflocculation for textile wastewater treatment

“…Over the recent years, there has been a growing interest in the development of efficient electrochemical processes for the removal of toxic organic wastewater contaminants. Such processes have been successfully tested to treat various industrial wastewaters, including dye wastewaters (Xiong et al, 2001).…”

Degradation of azo dye Acid Red 14 in aqueous solution by electrokinetic and electrooxidation process

“…The lowest energy absorption band (514 nm) was assigned to the n-p à transition of -N@N-group (Solozhenko et al, 1995). The peaks at 220 and 322 nm were the absorption of the p-p à transition related to the naphthalene rings bonded to the -N@N-group in the dye molecule (Wu et al, 2000;Xiong et al, 2001). It was apparent that the AR14 decreased dramatically with increasing reaction time and did not show any new absorbance bands in the UV-Vis region (Fig.…”

“…Recently, some methods that have been tried to overcome these problems have been reported. The researches have focused on the use of catalytic electrodes with high-applied potentials, such as SnO 2 /Ti anode (Comninellis and Pulgarin, 1993;Pulgarin et al, 1994;Panizza et al, 2000) and PbO 2 /Ti anode (Sch€ umann and Gr€ undler, 1998), and on the modification of the structure of electrode, such as the three-dimensional electrode (Xiong et al, 2001). The goals of these methods are to produce hydroxyl radicals efficiently and to make the most of these radicals to mineralize organic pollutants.…”