Abstract

ZnO flowers decorated with Pd nanoparticles on top were synthesized by a reduction deposition method using NaBH₄ as a reducing reagent for efficient degradation of methylene blue (MB) and methyl orange (MO) under UV light irradiation. Pd nanoparticles uniformly anchored on the surface of ZnO petals for improving photocatalytic activities by preventing the recombination of photo-excited electrons–photo-induced holes. Heterostructure Pd/ZnO nanocomposite flowers have photocatalytic activity for degrading of MB and MO solution under UV light irradiation better than pure ZnO flowers. In this research, heterostructure 5% Pd/ZnO flowers have 1.5 and 4.7 times for MB and MO photodegradation over pure ZnO flowers because of the enhanced separation efficiency of electron–hole pairs containing in the heterostructure Pd/ZnO flowers.

摘要

使用 NaBH ₄通过还原沉积法合成顶部装饰有 Pd 纳米颗粒的 ZnO 花作为在紫外光照射下有效降解亚甲蓝 (MB) 和甲基橙 (MO) 的还原剂。Pd 纳米粒子均匀地固定在 ZnO 花瓣的表面，通过防止光激发电子-光致空穴的复合来提高光催化活性。异质结构 Pd/ZnO 纳米复合花在紫外光照射下对 MB 和 MO 溶液的降解具有比纯 ZnO 花更好的光催化活性。在这项研究中，异质结构 5% Pd/ZnO 花对 MB 和 MO 的光降解是纯 ZnO 花的 1.5 和 4.7 倍，因为异质结构 Pd/ZnO 花中含有的电子 - 空穴对的分离效率提高。