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Electrochemical decoloration of synthetic wastewater containing rhodamine 6G / Yu-Ming Zheng in Industrial & engineering chemistry research, Vol. 51 N° 17 (Mai 2012) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 51 N° 17 (Mai 2012) . - pp. 5953–5960 Titre : Electrochemical decoloration of synthetic wastewater containing rhodamine 6G : Behaviors and mechanism Type de document : texte imprimé Auteurs : Yu-Ming Zheng, Auteur ; Rita Farida Yunus, Auteur ; K.G. Nadeeshani Nanayakkara, Auteur Année de publication : 2012 Article en page(s) : pp. 5953–5960 Note générale : Industrial chemistry Langues : Anglais (eng) Mots-clés : Electrochemical  Wastewater  Rhodamine Résumé : Dye wastewater has posed a great threat to our aqueous environment. In this study, the treatment of synthetic wastewater containing Rhodamine 6G by electrochemical technology using RuO2-coated Ti mesh as anode was investigated. The effects of solution pH, temperature, and dye auxiliaries on the performance were investigated. Carbon and nitrogen mass balance analyses, UV–vis spectroscopy, Fourier transform infrared spectroscopy (FTIR), X-ray photoelectron spectroscopy (XPS), and cyclic voltammetry (CV) were used to elucidate the working mechanism. It was found that lower solution pH and lower temperature facilitated the decoloration of the wastewater. The addition of dye auxiliaries did not significantly affect the decoloration. Under optimal condition, complete decoloration of the synthetic wastewater was obtained within 5 min, and 42.3% of the dye was mineralized. The amine and methyl groups were first detached from the dye molecule, leading to a change in the dye structure from polar into nonpolar to form a water insoluble substance. The insoluble substances were floated by the hydrogen bubbles that were generated from the cathode to produce foam products. On the other hand, the soluble substances that remained in the solution were mineralized via indirect electro-oxidation by active chlorine generated by the anode. A conceptual model for the electrochemical treatment of Rhodamine 6G containing water was proposed to illustrate the mechanism of decoloration. ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie2019273 [article] Electrochemical decoloration of synthetic wastewater containing rhodamine 6G : Behaviors and mechanism [texte imprimé] / Yu-Ming Zheng, Auteur ; Rita Farida Yunus, Auteur ; K.G. Nadeeshani Nanayakkara, Auteur . - 2012 . - pp. 5953–5960. Industrial chemistry Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 51 N° 17 (Mai 2012) . - pp. 5953–5960 Mots-clés : Electrochemical  Wastewater  Rhodamine Résumé : Dye wastewater has posed a great threat to our aqueous environment. In this study, the treatment of synthetic wastewater containing Rhodamine 6G by electrochemical technology using RuO2-coated Ti mesh as anode was investigated. The effects of solution pH, temperature, and dye auxiliaries on the performance were investigated. Carbon and nitrogen mass balance analyses, UV–vis spectroscopy, Fourier transform infrared spectroscopy (FTIR), X-ray photoelectron spectroscopy (XPS), and cyclic voltammetry (CV) were used to elucidate the working mechanism. It was found that lower solution pH and lower temperature facilitated the decoloration of the wastewater. The addition of dye auxiliaries did not significantly affect the decoloration. Under optimal condition, complete decoloration of the synthetic wastewater was obtained within 5 min, and 42.3% of the dye was mineralized. The amine and methyl groups were first detached from the dye molecule, leading to a change in the dye structure from polar into nonpolar to form a water insoluble substance. The insoluble substances were floated by the hydrogen bubbles that were generated from the cathode to produce foam products. On the other hand, the soluble substances that remained in the solution were mineralized via indirect electro-oxidation by active chlorine generated by the anode. A conceptual model for the electrochemical treatment of Rhodamine 6G containing water was proposed to illustrate the mechanism of decoloration. ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie2019273

Electrochemical removal of rhodamine 6G by using RuO2 coated Ti DSA / Rita Farida Yunus in Industrial & engineering chemistry research, Vol. 48 N° 16 (Août 2009) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 48 N° 16 (Août 2009) . - pp. 7466–7473 Titre : Electrochemical removal of rhodamine 6G by using RuO2 coated Ti DSA Type de document : texte imprimé Auteurs : Rita Farida Yunus, Auteur ; Yu-Ming Zheng, Auteur ; K.G. Nadeeshani Nanayakkara, Auteur Année de publication : 2009 Article en page(s) : pp. 7466–7473 Note générale : Chemical engineering Langues : Anglais (eng) Mots-clés : Rhodamine  6G  Electrochemical  removal  RuO2-coated  Ti Résumé : In this study, electrochemical removal of rhodamine 6G containing wastewater using RuO2-coated Ti mesh as dimensionally stable anode is investigated. The effects of pH, supporting electrolyte, electrolyte concentration, applied current, and distance between electrodes on the removal efficiency were examined in a batch reactor. It is shown that NaCl is the best supporting electrolyte among NaCl, Na2SO4, NaClO4, and NaNO3. Lower solution pH and higher concentration of supporting electrolyte facilitate the treatment process. Small distance between electrodes greatly decreases the energy consumption. The decolorization efficiency of above 99.5% and the low energy consumption of 1.58 kWh/m3 can be achieved under the optimized experimental condition of NaCl concentration of 0.2 M, applied current of 1.0−1.9 A, pH < 6, and distance between electrode of 5 mm. The RuO2-coated Ti mesh anode is shown to have good recyclability and lifespan. A greater dye removal of 99.2% can be obtained by a continuous stirred-tank reactor with a HRT of 4 min. It is anticipated that the developed technology from this study can be further scaled up for full-scale treatment of industrial dye containing wastewater. En ligne : http://pubs.acs.org/doi/abs/10.1021/ie801719b [article] Electrochemical removal of rhodamine 6G by using RuO2 coated Ti DSA [texte imprimé] / Rita Farida Yunus, Auteur ; Yu-Ming Zheng, Auteur ; K.G. Nadeeshani Nanayakkara, Auteur . - 2009 . - pp. 7466–7473. Chemical engineering Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 48 N° 16 (Août 2009) . - pp. 7466–7473 Mots-clés : Rhodamine  6G  Electrochemical  removal  RuO2-coated  Ti Résumé : In this study, electrochemical removal of rhodamine 6G containing wastewater using RuO2-coated Ti mesh as dimensionally stable anode is investigated. The effects of pH, supporting electrolyte, electrolyte concentration, applied current, and distance between electrodes on the removal efficiency were examined in a batch reactor. It is shown that NaCl is the best supporting electrolyte among NaCl, Na2SO4, NaClO4, and NaNO3. Lower solution pH and higher concentration of supporting electrolyte facilitate the treatment process. Small distance between electrodes greatly decreases the energy consumption. The decolorization efficiency of above 99.5% and the low energy consumption of 1.58 kWh/m3 can be achieved under the optimized experimental condition of NaCl concentration of 0.2 M, applied current of 1.0−1.9 A, pH < 6, and distance between electrode of 5 mm. The RuO2-coated Ti mesh anode is shown to have good recyclability and lifespan. A greater dye removal of 99.2% can be obtained by a continuous stirred-tank reactor with a HRT of 4 min. It is anticipated that the developed technology from this study can be further scaled up for full-scale treatment of industrial dye containing wastewater. En ligne : http://pubs.acs.org/doi/abs/10.1021/ie801719b