纳米ZnO因来源广、廉价和无毒性等优点得到广泛的研究,但其可见光响应范围窄、较宽的禁带宽度和光生电子-空穴复合较快等问题已成为纳米ZnO实际应用的瓶颈。采用水热合成法制备了铁和镍共掺杂ZnO复合光催化剂Fe0.02/Nix-ZnO,通过X射线衍射仪、扫描电子显微镜、透射电子显微镜、X射线光电子能谱仪、紫外-可见漫反射光谱仪、光致发光光谱仪、电化学交流阻抗测试等对复合光催化剂的相结构、微观形貌、元素价态、光学性质和电化学性质进行表征,考察了复合光催化剂对罗丹明B的光催化活性。结果表明:当Fe3+掺杂量为2%、Ni2+掺杂量为10%(均为质量分数)时,Fe0.02/Ni0.1-ZnO复合光催化剂的禁带宽度明显减小,对罗丹明B的降解率最高。自由基捕获和电子自旋共振波谱分析证实,空穴是光降解罗丹明B的主要活性物种。
Nano ZnO has been widely studied due to its advantages of wide source,cheapness and non-toxicity,but its narrow visible light response range,wide forbidden band width and faster photogenerated electron-hole complexation have become the bottlenecks for the practical application of nano ZnO.Iron and nickel co-doped ZnO composite hotocatalysts Fe0.02/Nix-ZnO were prepared by hydrothermal synthesis,and the phase structure,micro-morphology,elemental valence,optical properties and electrochemical properties of the composite photocatalysts were characterised by X-ray diffraction,scanning electron microscopy,transmission electron microscopy,X-ray photoelectron spectroscopy,UV-visible diffuse reflection spectroscopy,photoluminescence spectrometry and electrochemical AC impedance,and the photocatalytic activity of the composite photocatalysts towards rhodamine B was investigated.The results showed that the forbidden band width of the Fe0.02/Ni0.1-ZnO composite photocatalyst was significantly reduced and the degradation rate for RhB was optimal when the Fe3+ doping was 2wt.% and the Ni2+ doping was 10wt.% (both mass fractions).Free radical trapping and electron spin resonance spectroscopy analyses confirmed that holes were the main active species for photodegradation of RhB.
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基金资助
国家自然科学基金(21878024);锦州市指导性科技计划(JZ2020B032)
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