【摘要】 以硝酸锌、二甲基咪唑(制备沸石咪唑酯骨架结构材料(ZIF)的主要原料)、以及硝酸铈等制备了Ce掺杂的Zn O光催化剂(即Ce-ZnO),对催化剂进行了XRD,SEM,EDS等表征分析,考察了Ce掺杂量、废水初始pH等对亚甲基蓝降解影响,用UV-Vis(可见-紫外光谱)对亚甲基蓝降解液进行了分析。研究表明,与ZIF为前驱体的Zn O的形貌和晶体结构类似,Ce掺杂的Zn O催化剂仍为方形颗粒微纳米材料(颗粒尺寸约100 nm)、Zn O为六方晶系纤锌矿结构,但颗粒尺寸减小。掺杂1%的Ce可使Zn O的光催化剂活性提高(光催化剂降解亚甲基蓝的反应速率提高了31%),且具有较好的重复利用性能。Ce-ZnO光催化剂催化降解亚甲基蓝的反应符合一级反应动力学,弱碱性(pH≈10)环境有利于亚甲基蓝光催化剂降解,亚甲基蓝在光催化反应中其显色基团、芳香基团被分解并产生了酸性物质,亚甲基蓝被有效降解。更多还原

【Abstract】 Ce-doped ZnO photocatalyst(Ce-ZnO) was prepared by zinc nitrate, dimethylimidazole(the main raw material for ZIF) and cerium nitrate. The catalysts were characterized by XRD, SEM and EDS. The effects of Ce content and initial pH of wastewater on the degradation of methylene blue were investigated. Methylene blue degradation solution was analyzed by UV-Vis(visible UV spectrum). The results show that, similar to the morphology and crystal structure of ZnO with ZIF as precursor, the Ce-doped ZnO catalyst is still a square particle micro-nano material(particle size about 100 nm), and the ZnO is a hexagonal wurtzite structure, but the particle size decreases. Doping 1% Ce can improve the photocatalytic activity of ZnO(the reaction rate of photocatalytic degradation of methylene blue increased by 31%) and has good reuse performance. The photocatalytic degradation of methylene blue by Ce-ZnO photocatalyst follows the first-order reaction kinetics. The weak alkaline environment(about pH=10) is favorable for the degradation of methylene blue photocatalyst. The chromogenic and aromatic groups of methylene blue are decomposed into acidic substances in the photocatalytic reaction, and the methylene blue is effectively degraded.更多还原