Advanced electro-Fenton degradation of biologically-treated coking wastewater using anthraquinone cathode and Fe-Y catalyst

摘要

The electrocatalytic activity of bare and 2-ethyl anthraquinone-modified graphite felt (2-EAQ/GF)ntoward oxygen reduction was investigated using a cyclic voltammetry technique in a neutral solution.nThe prepared cathodes were tested for electrogeneration of H2O2 and electro-Fenton oxidation (EFO)ntreatment of neutral coking wastewater (CW) after biological process, using a graphite anode and Fe-nzeolite Y catalyst. The results showed that (i) H2O2 yield and current efficiency greatly depended onncathodic potential and materials; (ii) hydroxyl radicals, generated from Fe-zeolite Y-catalyzed H2O2ndecomposition, played a great role in EFO treatment, while anodic direct and indirect oxidation wasninsignificant; (iii) chemical oxygen demand, total organic carbon (TOC) and acute toxicity ofnwastewater decreased by 40–50, 30–40 and 50–60%, respectively, and biodegradability increasednafter 1 h of EFO treatment. Due to the free-pH adjustment, EFO presents a potential engineeringnapplication for advanced treatment of CW.