Affiliations: Department of Environmental Science and Engineering,
Heilongjiang University, Harbin 150086, China | School of Municipal and Environmental Engineering,
Harbin Institute of Technology, Harbin 150090, China
Abstract: By using a self-made carbon/polytetrafluoroethylene (C/PTFE)
O_2-fed as cathode and
Ti/IrO_2/RuO_2 as anode, the effects of
electrochemical oxidation of phenol and the coal-gas wastewater containing
phenol were studied. The terylene diaphragm which kept pH >12 in cathodic
compartment and pH <1 in the anodic compartment was selected in the
experiment in comparison with the other types of diaphragm. Furthermore,
hydroxyl radical (HO·) was determined in the cathodic compartment of the
diaphragm cell by electron spin resonance spectrum ESR) and the fluorescence
spectra. Compared with pH, the accumulated
H_2O_2 and the COD removal of the
no-diaphragm cell, the mechanism of electrochemical oxidation in the terylene
diaphragm cell was supposed. The degradation of phenol was supposed to be
cooperative oxidation by direct or indirect electrochemical oxidation at the
anode and H_2O_2, HO· produced by
oxygen reduction at the cathode. The mineralization of phenol in the diaphragm
cell was better than that in the no-diaphragm cell. When the coal-gas
wastewater was treated by the electrolysis system with terylene diaphragm, the
average removal efficiency of the volatile phenol and COD were 100% and 79.6%,
respectively.
