Electro-catalytic degradation of bisphenol A with modified Co3O4/β-PbO2/Ti electrode

Electrochemical degradation of chloramphenicol with a novel Al doped PbO2 electrode: Performance, kinetics and degradation mechanism

“…As shown in Table 2, the k value at initial pH value of 3 was about 2.4 times higher than that at pH 11, and the respective t 1/2 value increased from 29.39 min to 70.72 min when pH increased from 3 to 11, suggesting that the degradation process was more favorable in acidic solution. The following two mechanisms were proposed to explain the trend observed for the different pH values: (1) The oxidation potential of hydroxyl radical was higher in acid condition (+2.85 V) than in alkaline condition (+2.02) [21], thus, the low pH inhibited the oxygen evolution reaction and caused the improvement of CAP degradation efficiency. (2) Carbon dioxide, as a final product formed from the mineralization of CAP, could be converted to bicarbonate and carbonate ions in solutions under alkaline conditions, which could prevent CAP oxidation [30].…”

“…The HOCl/OCl -pair reacts with organic compounds by addition, substitution or oxidation [42]. According to the literature [21], lower pH is positive for the formation of active chlorine species.…”

“…Considerable efforts have been devoted to solve these problems, including adding inter-layer, doping with rare earth or modifying by some metals (Bi, Co, Fe, etc.) [18][19][20][21]. However, these methods still exist some inevitable limitations.…”

Development of a Three-Dimensional Structured Carbon Fiber Felt/β-PbO2 Electrode and Its Application in Chemical Oxygen Demand Determination

“…It was firstly degreased in Na 2 CO 3 solution (20%, m/m) at 80 • C for 0.5 h and then etched in boiling oxalic acid (15%, m/m) for 1 h to produce a gray surface with uniform roughness. Ti/Sb 2 O 3 -SnO 2 electrode was prepared by a sol − gel technique in the following steps [31,32]: 50 mL of isopropyl alcohol was placed in a beaker, followed by adding SnCl 4 ·5H 2 O (15.0 g) and SbCl 3 (1.5 g) to the solution to obtain sol − gel and then dipping onto the pretreated titanium sheet and drying at 120 • C in an oven for 10 min, and then thermal decomposing at 450 • C in a muffle furnace for 10 min. The baking operation was repeated 10 times to prepare the Ti/Sb 2 O 3 -SnO 2 electrode, but the last baking lasted 1 h at 450 • C in the muffle for annealing.…”

Scaled-up electrochemical reactor with a fixed bed three-dimensional cathode for electro-Fenton process: Application to the treatment of bisphenol A

“…Different processes were examined for bisphenol A removal from natural water or wastewater, in particular, AOPs [9,19,20]. Among these processes, we can found UV/H2O2 oxidation [21], photo-Fenton [22], ozonation [23,24], direct electrochemical oxidation [25][26][27][28][29] as well as indirect electrochemical oxidation processes like Fenton and electro-Fenton [30][31][32] processes. These processes have demonstrated a high bisphenol A abatement efficiency for a small volume treatment.…”