采用微波辐射-焙烧法合成了ZnO/Ce纳米光催化剂,利用X射线粉末衍射、扫描电镜、X-射线能谱和紫外-可见光谱等技术对ZnO/Ce的晶相结构、表面形貌和光催化性能等进行表征。以罗丹明B脱色降解为模型反应,考察不同合成条件对光催化性能的影响。结果表明:最佳条件为2-甲基咪唑和二水合乙酸锌物质的量比为10∶1,微波辐射12min(650W),无水乙醇为溶剂,马弗炉550℃煅烧5h,铈含量为2%,可以得到纯度高、颗粒小、光降解效果好的ZnO/Ce纳米材料。该材料不仅合成时间短,45min内太阳光下对罗丹明B的降解率为97.1%,较纯ZnO提高了26.6%,降解反应过程符合准一级动力学模型。
Nano-ZnO/Ce photocatalysts were prepared by microwave radiation-calcination process.The phase structure,morphology and photocatalytic degradation performance of the samples were characterized by X-ray diffraction (XRD),scanning electron microscopy (SEM),energy dispersive spectrometer (EDS) and ultraviolet visible spectrophoto-metry(UV-Vis).The photocatalytic activity of the samples was evaluated by rhodamine B.The effects of different synthesis conditions on photocatalytic degradation performance were investigated.The results showed that nano-ZnO/Ce with small particle sizes,high purity and excellent was prepared while Zn/2-methylimidazole molar ratio was 1∶10,microwave radiation time was 12min(650W),Anhydrous ethanol was the solvent,the calcination temperature and time were 550℃ and 5h,Zn/Ce molar ratio was 50∶1.The microwave irradiation greatly reduced the synthesis time,and its degradation rate could reach 97.1% within 45min in sunlight,26.6% higher than pure ZnO.Furthermore,degradation of ZnO/2% Ce showed a good compliance with the pseudo-first-order kinetic model.The compound probability of electron and hole could be effectively restrained by doping Ce,which resulted in decreasing the crystal size,broadening the range of light response and increasing of photocatalytic properties.
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基金资助
“十二五”浙江省实验教学示范中心重点建设项目(浙教办高教[2015]101号);浙江省高校实验室工作研究项目(YB201937);浙江大学宁波理工学院校级教学研究与改革重点项目(NITJG-201917)
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