【摘要】 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（Raman）、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0.05 mol/L ZnSO₄、2 mol/L NH₄Cl溶液中,以0.03 A/cm²的恒电流密度阴极极化120 s,电沉积锌后于空气气氛中350℃下加热1 h,然后升温至450℃下加热2 h,在不锈钢表面形成了ZnO和尖晶石结构氧化物(AB₂O₄,A=Zn²⁺、Ni²⁺、Fe²⁺;B=Fe³⁺,Cr³⁺)的复合氧化膜,显示出良好的可见光光催化性能。更多还原

【Abstract】 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 rhodamine B（RhB,3 mg/L） in aqueous solutions under visible irradiation（λ>380 nm）. The results 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 NH₄ Cl,at 0.03 A/cm² 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 = Zn²⁺,Ni²⁺ and/or Fe²⁺,B = Fe³⁺ and/or Cr³⁺ ).更多还原