不锈钢表面ZnO-尖晶石复合氧化膜的制备及其可见光光催化性能

通过电沉积锌及空气气氛下两步热氧化，在304不锈钢表面形成具有可见光光催化活性的ZnO复合氧化物薄膜。运用X-射线衍射（XRD）、拉曼光谱（Rarnan）、扫描电子显微镜（SEM）分析薄膜的结构及表面形貌，在可见光照射下测试了氧化膜催化降解罗丹明B的性能。结果显示：在0．05m0I／LZnSO4、2moL／LNH4Cl溶液中，以0．03A／cm^2的恒电流密度阴极极化120s，电沉积锌后于空气气氛中350℃下加热1h，然后升温至450℃下加热2h，在不锈钢表面形成了ZnO和尖晶石结构氧化物（AB2O4，A=Zn^2＋、Ni^2＋、Fe^2＋；B=Fe^3＋，Cr^3＋）的复合氧化膜，显示出良好的可见光光催化性能。

Preparation and Visible Light Photocatalytic Activity of ZnO-spinel Composite Oxides Films on a Stainless Steel Surface

ZnO based composite oxides films with visible light photocatalytic activities were prepared by electrodepositing zinc on a 304 stainless steel substrate, followed by two-step thermal oxidation in air. The structure and morphology of the oxide films were charactered by X-ray diffraction （XRD） , Raman spectrometer, Scanning electron microscopy （ SEM ） , respectively. The photocatalytic activity of the oxide films were evaluated by photocatalytic degradation of rhodaminc B （ RhB ,3 mg/L） in aqueous solutions under visible irradiation（ k 〉 380 nm）. The resutts revealed that the composite films with well visible photocatalytic performance could be obtained by electrodepositing Zn in a solution containing 0.05 mol/L ZnSO4 ,2 mol/L NH4Cl,at 0. 03 A/cm^2 of cathodic current density for 120 s,then heated in air at 350℃ for 1 h following by 450℃ for 2 h. The oxides films formed on the surface of the stainless steels were composite oxide films of ZnO-spinel oxides （ AB2O4, A = Zn^2 ＋ , Ni^2 ＋ and/or Fe^2 ＋ , B = Fe^3 ＋ and/or Cr^3 ＋ ）.