Department of Chemistry and Chemical Engineering, Shaanxi Key Laboratory of Chemical Reaction Engineering, Yan'an University, Yanan, Shaanxi 716000, China.
Department of Chemistry and Chemical Engineering, Shaanxi Key Laboratory of Chemical Reaction Engineering, Yan'an University, Yanan, Shaanxi 716000, China.
J Colloid Interface Sci. 2019 Jan 1;533:649-657. doi: 10.1016/j.jcis.2018.08.091. Epub 2018 Aug 27.
Photocatalytic nitrogen fixation provides an attractive approach to produce reactive nitrogen compounds at benign conditions. Herein, Ag decorated δ-BiO photocatalyst, which has the features of multilayer ultrathin structure, suitable absorption edge and many exposed surface sites, is prepared by a hydrothermal and photoreduction process. Under visible light illustration, the obtained Ag-δ-BiO photocatalyst exhibits efficient photocatalytic activity for NH generation at room temperature and atmospheric pressure in aqueous solution. The multilayer ultrathin sheets in the structure of Ag-δ-BiO favors the effective separation of photogenerated electron-hole pairs and fast interfacial charge transfer. Due to the Ag surface plasmonic resonance, obvious trap is formed in the ultrathin Ag-δ-BiO sheets, which not only inhibites the recombination of electron hole pairs but also produces light-induced oxygen vacancies under irradiation. Those factors significantly improve the photocatalytic ability of as-prepared Ag-δ-BiO. The results provide insights into rational design of enhanced active photocatlysts with Ag surface plasmonic resonance and ultrafast charge carrier transfer for photocatalytic nitrogen fixation.
光催化固氮为在温和条件下制备活性氮化合物提供了一种有吸引力的方法。在此，通过水热和光还原过程制备了具有多层超薄结构、合适的吸收边缘和许多暴露表面位的 Ag 修饰的 δ-BiO 光催化剂。在可见光照射下，所得到的 Ag-δ-BiO 光催化剂在室温下和大气压力下在水溶液中表现出高效的光催化 NH3 生成活性。Ag-δ-BiO 结构中的多层超薄片有利于光生载流子的有效分离和快速界面电荷转移。由于 Ag 表面等离激元共振，在超薄 Ag-δ-BiO 片中形成明显的陷阱，不仅抑制了电子空穴对的复合，而且在光照下还产生光诱导氧空位。这些因素显著提高了所制备的 Ag-δ-BiO 的光催化能力。该结果为合理设计具有 Ag 表面等离激元共振和超快电荷载流子转移的增强活性光催化剂用于光催化固氮提供了新的思路。
