The Electrooxidation Of Phenol Derivatives
THE ELECTROOXIDATION OF PHENOL DERIVATIVES
AND HUMIC ACID ON THE SURFAСE OF ALTERNATING VALENCE METAL OXIDES
S. Y. Bashtan, V. V. Goncharuk, R. D. Chebotareva, D. Morze
Institute of Colloid and Water Chemistry National Academy of Sciences
of Ukraine, Kyiv
The electrooxidation of phenol derivatives and humic acid goes through the formation of free radicals intermediate, which is absorbed on the anode surface. The rate of reaction depends on the activity of anode material in electrochemical destruction of organic substance. The alternating valence metal oxides, used as a load in the anode chamber, enforse the oxidation of a number of organic compounds.
A number of oxides, such as Fe2O3, MnO2, Co3O4, NiO, CuO, TiO2, Cr2O3 were studied for their effect on the process of electrooxidation of solutions containing humic acid and phenol using a Na2SO4 background. The process employing titanium based electrodes, coated by manganese dioxide (TDMA) and cobalt oxide (OKTA) was investigated too. The loads of above metal oxides in the anode chamber were found to intensify the decomposition process. The oxides as follows Co3O4, CuO, TiO2, Cr2O3 appeared to have high catalytic properties. In the present of Co3O4 the degree of phenol decomposition reached up to 100%.
The process of phenol derivatives oxidation using flowing device, equipped with a tube ceramic membrane, was investigated. Using TDMA, the energy consumption of phenol oxidation was 0,6-2,0 KwtЧh/mg phenol.
The capacity of destruction was also shown to depends on the nature of load. The catalytic type of load was found to be more desirable in process studied.
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