钛基RuO_x-PdO电极光电降解活性艳红K-2BP

Photoelectrochemical Degradation of Reactive Brilliant Red K-2BP on RuO_x-PdO/Ti Electrode

以自制钛基RuOx-PdO电极为阳极,钛片为阴极,NaCl、NaNO3、Na2SO4等为支持电解质,研究了活性艳红K-2BP的光电降解行为.结果表明,钛基RuOx-PdO电极光电降解活性艳红K-2BP时,其适用性较强,可在低电流密度、较大的pH值区间和较宽的废污物浓度范围内达到较好的脱色效果;在pH≈6.0、NaCl浓度为0.02mol·L-1、电流密度为0.25mA·cm-2及室温条件下,20mg·L-1活性艳红K-2BP溶液经光电降解30min,脱色率可以达到91.6%.在本实验条件下,活性艳红K-2BP的脱色降解主要是光电降解与电生活性氯在紫外光照下生成HO"、O-和Cl"等强活性物种共同作用的结果.

RuOx-PdO/Ti electrode was prepared and used in the photoelectrochemical degradation of reactive brilliant red K-2BP. The effects of supporting electrolytes, such as NaCl, NaNO3, and Na2SO4, on the discoloration were studied. Several parameters altering the efficiency of the photoelectrochemical degradation were also investigated and optimized. It was found that under the optimal reaction conditions, that is, pH ≈6.0, the NaCl concentration 0.02 mol ·L^-1, and current intensity 0.25 mA ·cm^-2, a color removal of 91.6% within 30 min could be obtained. The main cause of the discoloration could be attributed to a synergetic effect between electrochemical process and photochemical process, that is, to a synergetic effect between the active chlorine formed during the electrochemical treatment as well as the derived HO ·, O^-, Cl · species under photo radiation and the photoelectrochemical degradation. The electrode performed well over a wide range of temperatures and initial concentrations of dye. This showed promise for the application of RuOx-PdO/Ti electrode in the treatment of dye-polluted water.