CuO/Al_2O_3微弧氧化复合膜层的制备及催化性能

Preparation and catalysis property of CuO/Al_2O_3 micro-arc oxidation composite coating

采用电解液修饰法,利用微弧氧化技术直接在铝基体上制备CuO/Al2O3微弧氧化复合膜层,研究复合膜层表面元素的结合状态以及电参数对复合化膜层表面形貌和孔径的影响,探讨复合膜层对甲基橙溶液的催化降解作用。结果表明:利用微弧氧化技术可一步制备出CuO/A12O3复合膜层,且CuO晶格氧含量可达33.7%(质量分数);随着电压、占空比的增大和频率的减小,复合膜层表面微孔的孔径增加,孔数目减少,粗糙程度增加;复合膜层在常温常压下催化10 h可使甲基橙溶液降解率达到70%左右。

The micro-arc oxidation technology was employed to directly prepare a CuO/Al2O3 composite coating film on an alunimium substrate,which was also modified by doping electrolyte. The properties of CuO/Al2O3 coating film were investigated focusing on the adhesion of different elements on the coating surface,the effect of electrical parameters on the surface morphologies and the pore diameter,and the catalytic degradation of methyl orange by CuO/Al2O3 composite film was also investigated. The results show that micro-arc oxidation technology can be introduced to prepare a CuO/Al2O3 composite film. The content of oxygen reaches 33.7% in the CuO lattice. The pore diameter and number of the composite film are seriously influenced by the electrical parameters. With the increase of the voltage and the duty ratio（φ） and the decrease of the frequency,the surface pore diameter and roughness of the composite film increase,while the number of holes decrease. The degradation rate of methyl orange reaches 70% by the catalysis of the CuO/Al2O3 composite coating film for 10 h at ordinary temperatures and pressures.