Fe-Ni 共掺杂 ZnO 的制备及其光催化降解甲基橙活性

 采用溶液法制备了 Fe-Ni 共掺杂 ZnO 光催化剂, 并运用 X 射线衍射、扫描电镜和原子发射光谱等对催化剂进行了表征. 以甲基橙 (MO) 为模型污染物, 评价了样品的光催化活性, 考察了甲基橙初始浓度及其 pH 值, 以及催化剂用量等对光催化反应性能的影响. 结果表明, Fe-Ni 共掺杂降低了 ZnO 的结晶度, 并促进了晶粒的长大. 光催化降解反应表明, Fe-Ni 共掺杂显著提高了 ZnO 光催化降解甲基橙的活性, 当催化剂用量为 0.6 g/L, 经 120 min 紫外光照射时, 可使甲基橙溶液 (10 mg/L) 降解率达到 93.5%. 关键词：铁; 镍; 共掺杂; 氧化锌; 光催化; 甲基橙; 降解

Preparation of (Fe, Ni)-Codoped ZnO and Its Photocatalytic Activity for Degradation of Methyl Orange

The (Fe, Ni)-codoped ZnO photocatalyst was prepared by a solution method. The product was characterized by X-ray diffraction, scanning electron microscopy, and inductively coupled plasma-atomic emission spectroscopy. The photocatalytic activity of the catalyst was investigated by photodegradation of methyl orange. The effects of initial concentration of methyl orange, photocatalyst amount, and initial pH of methyl orange solution on the photocatalytic efficiency were discussed. The results showed that the (Fe, Ni) co-doping could decrease the crystallinity of ZnO and improve the grain growth of ZnO. The photodegradation experiments showed that (Fe, Ni) co-doping remarka-bly improved the photocatalytic activity of ZnO for methyl orange degradation. The degradation rate of methyl orange solution (10 mg/L) reached 93.5% over (Fe, Ni)-codoped ZnO (0.6 g/L) in 120 min under the irradiation of ultraviolet light.