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• W2000635504 abstract "We evaluated the effect of a catecholate chelator as a redox agent in Fenton-based reactions (known as chelator-mediated Fenton reaction—CMFR), in the presence of three different transition metals ions (Fe2+, Fe3+ and Cu2+) by determining the oxidative capability of CMFR towards lignin-model substrates. The potential application of mediated Fenton-based reactions as a novel process to treat pulp mill effluent was evaluated and monitored by chemical oxygen demand (COD) and total phenol removals from a combination of the effluents generated during an ECF bleaching stage. The catecholate chelator 3,4-dihydroxiphenilacetic acid (DOPAC) reduced both Fe3+ and Cu2+, in addition, the maximum Cu2+ reduction activity was reached in a shorter time than for Fe3+ reduction, however, the highest metal reduction activity was observed with Fe3+. When DOPAC was added to Fenton-based reactions (Fe3+/H2O2, Fe2+/H2O2, Cu2+/H2O2) an increase in oxidative activities of these reactions were found as they resulted in great degradation improvement of the lignin-model substrates azure B, phenol red and syringaldazine. The same increase in oxidative capability of Fenton-based reactions in the presence of DOPAC was observed after effluent treatment, expressed by the increase in COD removal, namely, an increase in the range of about 70% in COD removal when Fe2+ or Fe3+ was the catalytic metal and about 25% for Cu2+. However CMFR lead to an increase in total phenol content. As COD removal by CMFR system using Fe3+ and Fe2+ was not significantly different and that Fe3+ ions promoted lesser increase in total phenol content, Fe3+ was chosen for experimental optimization. At optimum conditions, 75% of COD and 30% of total phenol removal were achieved." @default.
• W2000635504 created "2016-06-24" @default.
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• W2000635504 date "2007-03-06" @default.
• W2000635504 modified "2023-10-07" @default.
• W2000635504 title "The effect of a catecholate chelator as a redox agent in Fenton-based reactions on degradation of lignin-model substrates and on COD removal from effluent of an ECF kraft pulp mill" @default.
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• W2000635504 doi "https://doi.org/10.1016/j.jhazmat.2006.06.134" @default.
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