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以糠醛和ZnO粉体为原料,用酸催化聚合的方法制备了复合光催化剂前驱体,经适当热处理后得到ZnO-共轭高分子(ZnO-PFD)纳米复合微粒,通过SEM、XRD、FTIR、UV-vis、TG-DTA等技术对其表面形貌及结构进行了表征。结果表明,复合微粒的粒径为50～100nm,其中ZnO呈六方纤锌矿结构,PFD的掺杂拓宽了ZnO的光谱响应范围,使其能吸收紫外-可见区的全程光波。在自然光、室温条件下,以亚甲基蓝(MB)的脱色降解为模型反应,考察了复合微粒的光催化性能,探讨了热处理温度和ZnO含量对复合微粒光催化性能的影响。当热处理温度为400℃,ZnO的质量分数为48.62%时,复合微粒对MB降解反应20min,就可使MB水溶液完全脱色,COD去除率达70.24%,ZnO重复使用3次后,对MB的脱色率仍可达87%。
The photocatalyst precursors were prepared by acid catalyzed polymerization using furfural and ZnO powders as raw materials. ZnO-PFD nanocomposite particles were obtained by proper heat treatment. The microstructure of the composites was characterized by SEM, XRD, FTIR, UV-vis, TG-DTA and other techniques on the surface morphology and structure were characterized. The results show that the particle size of the composite particles is 50 ~ 100nm. ZnO has a hexagonal wurtzite structure. The doping of PFD broadens the spectral response range of ZnO and makes it absorb the entire light wave in the UV - visible region. Under natural light and room temperature, the degradation of methylene blue (MB) was taken as a model reaction, the photocatalytic activity of the composite particles was investigated, and the effect of heat treatment temperature and ZnO content on the photocatalytic activity of the composite particles was also discussed. When the heat treatment temperature is 400 ℃ and the mass fraction of ZnO is 48.62%, the degradation of MB in aqueous solution can be completely bleached by the composite particles after being degraded for 20min. The removal rate of COD is 70.24%. After repeated use of ZnO for three times, The rate is still up to 87%.