纳米ZnO/Ni电极的制备及光电催化性能研究

PREPARATION AND PHOTOELECTROCATALYTIC PERFORMANCE OF NANO-ZnO/Ni ELECTRODE

采用阴极电沉积法制备泡沫镍负载纳米氧化锌电极,并用扫描SEM和XRD分析其晶粒形貌和物相结构。以刚果红染料为模拟污染物,ZnO/Ni为工作电极,铂丝电极为对电极,对刚果红染料废水进行了光电结合催化降解的试验研究。考察了外加偏压、氯离子浓度和溶液初始pH对刚果红染料废水光电催化降解效率的影响,同时在最优条件下比较了光催化降解、电解与光电结合催化降解对刚果红染料废水的降解效果的差异。结果表明,在相同条件下,光电结合催化降解刚果红染料废水的速率比单纯的光催化降解速率和单纯的电解速率快。在外加偏压为1.2 V,支持电解液浓度为0.20 mol.L-1,溶液pH为6时对40 mg.L-1的刚果红光电催化降解120 min时的降解率、色度和COD去除率分别达到82.57%、94.00%和68.72%。

The nano-ZnO coated on porous nickel film electrode was prepared by cathodic electro-deposition method.The surface morphology,crystal structure features and the grain size were characterized by scan electron microscopy（SEM） and X-Ray diffraction（XRD）.Taking the Congo Red as the contamination for simulation,ZnO/Ni as the working electrode and Pt wire as the counter electrode were used for the photoelectrocatalytic degradation of Gongo Red.The effects of Congo red degradation rate of different degradation methods,concentrations of Cl-and initial pH values were discussed.The difference of degradation rates were compared among photoelectrocatalysis,photocatalysis and electrolysis treatments.The results indicated that,in the same condition,the photoelectrocatalytic degradation of Congo red dye wastewater reaction rates faster than that of single photocatalyst and simplex electrolysis.Under the condition of bias voltage 1.2 V,0.20 mol·L-1 NaCl,pH 6,reaction time 120 min,the removal efficiencies of Gongo Red degradation,color and COD are 82.57%,94.00% and 68.72%,respectively.