Comparison of Ti/BDD and Ti/SnO2?Sb2O5 electrodes for pollutant oxidation

Abstract

Anodic oxidation is a promising process for degrading toxic and biologically refractory organic pollutants present in wastewater treatment. Proper selection of electrodes is the key to reach effective and economic operation. In this study, two types of electrodes, i.e. the recently developed Ti/BDD and Ti/SnO 2 -Sb 2 O 5 , which is generally believed to be superior to the conventional electrodes, were compared under the same conditions. It was found that the Ti/ BDD electrode could mineralize both phenol and reactive dyes effectively. But the Ti/SnO 2 -Sb 2 O 5 electrode could only mineralize phenol. When oxidizing more refractory reactive dyes, it demonstrated very poor activity. In addition, the Ti/BDD electrode had a service life of 264 h in an accelerated life test, but the Ti/SnO 2 -Sb 2 O 5 was irreversibly damaged within several seconds. The direct experimental comparison in the present study indicates that the Ti/BDD electrode is much better than the Ti/SnO 2 -Sb 2 O 5 electrode for pollutant oxidation.

Kinetic modelling of the electrochemical mineralization of organic pollutants for wastewater treatment

“…In fact, only electrical energy is consumed for the mineralization of organic pollutants. Besides our contribution in this field [1][2][3][4][5][6][7][8][9][10][11], many other research groups are active in this promising technology [12][13][14][15][16][17][18][19][20][21][22][23][24].…”

The influencing factors and mechanism of degradation of hypersaline tobias acid in electro-catalytic oxidation

“…The organics were degraded rapidly through quick oxidation and free radical chain process, under the reaction of hydroxyl radical. At that time, electrobath voltage was still lower than the overpotential for oxygen evolution with no remarkable side effects [7] [8]. Therefore, COD removal rate increased as well as current efficiency.…”

“…That was to say, it would succeed in reacting with aromatic materials rather than fatty acid. Reaction in anode Ti/IrO 2 might take place when solution was electrolyzed: first of all, tobias acid would be got involved in the direct electrochemical reaction on the electrode [10][11][12](R represent tobias acid).…”

Nontraditional Electrode Materials in Environmental Analysis of Biologically Active Organic Compounds

“…Therefore, nowadays the stress is put on the search for new substrates for BDD depositions. Metals like Nb, Ta, W and substantially cheaper Ti are promising and were tested for the destruction of several pollutants, e.g., dyes [80 -82], carboxylic acids [82] and phenol [81,82].…”