Preparation and Photocatalytic Performance of Aumodified ZnO Nanorod Catalysts

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Abstract
本文通过将Au纳米粒子(AuNPs)组装到ZnO纳米棒(ZnO NRs)表面制备了异质结构ZnO NRs-AuNPs光催化剂，利用光学吸收光谱、透射电子显微镜等手段分析了AuNPs和ZnO NRs-AuNPs催化剂的结构特征，同时考察了催化剂对亚甲基蓝的光催化降解效率。研究结果表明，柠檬酸钠还原法制得的Au纳米粒子粒径均一，能够均匀地分散在ZnO纳米棒表面，制备的ZnO NRs-AuNPs光催化剂能够有效抑制光生电子–空穴的复合，其光催化活性得到显著增强，当HAuCl4用量为1.5 mL时，经60 min光催化反应后该催化剂对亚甲基蓝的降解效率高达92.4%。The ZnO nanorods-Au nanoparticles (ZnO NRs-AuNPs) photocatalysts were prepared by assembling Au nanoparticles (AuNPs) on the surface of ZnO nanorods (ZnO NRs). The structural characteristics of AuNPs and ZnO NRs-AuNPs were analyzed by optical absorption spectroscopy and transmission electron microscopy, and meanwhile the degradation efficiency of methylene blue on the photocatalysts was investigated. The results showed that the AuNPs which were obtained by sodium citrate reduction method could be evenly dispersed on the surface of ZnO NRs. The ZnO NRs-AuNPs photocatalysts could effectively prevent the recombination of photogenerated elec-tron-hole, and hence its photocatalytic activity was significantly enhanced. When the dosage of HAuCl4 was 1.5 mL, the removal efficiency of methylene blue on the catalyst reached 92.4% after 60 min of photocatalytic reaction.