Zhao Feifei, Khaing Kyu Kyu, Yin Dongguang, Liu Bingqi, Chen Tao, Wu Chenglong, Huang Kexian, Deng LinLin, Li Luqiu
School of Environmental and Chemical Engineering, Shanghai University Shanghai 200444 China
RSC Adv. 2018 Dec 19;8(74):42308-42321. doi: 10.1039/c8ra07901c.
A novel heterostructured nanocomposite UCNPs@SiO@Ag/g-CN was developed for the first time to substantially boost the solar-light driven photocatalytic activity of g-CN. Its photocatalytic properties and photocatalytic mechanism were investigated. The as-synthesized photocatalyst with excellent improvement in the solar absorption and separation efficiency of photoinduced electron-hole pairs exhibited optimum solar-induced photocatalytic activity in dye degradation and hydrogen production. The experimental results showed that the rates of degradation of Rhodamine B (RhB) and hydrogen evolution were about 10 and 12 times higher than that of pristine g-CN, respectively. The excellent photocatalytic activity was attributed to the synergetic effect of upconversion nanoparticles (UCNPs) and Ag nanoparticles (NPs) on the modification of the photocatalytic properties of g-CN, resulting in a broad light response range for g-CN as well as the fast separation and slow recombination of photoinduced electron-hole pairs. This study provides new insight into the fabrication of g-CN-based nanocomposite photocatalysts with high catalytic efficiency through the artful assembly of UCNPs, Ag NPs and g-CN into a hetero-composite nanostructure. The prominent improvement in photocatalytic activity enables the potential application of g-CN in the photocatalytic degradation of organic pollutants and hydrogen production utilizing solar energy.
首次开发了一种新型异质结构纳米复合材料UCNPs@SiO@Ag/g-CN，以大幅提高g-CN的太阳光驱动光催化活性。研究了其光催化性能和光催化机理。所合成的光催化剂在光诱导电子-空穴对的太阳能吸收和分离效率方面有优异提升，在染料降解和产氢方面表现出最佳的太阳能诱导光催化活性。实验结果表明，罗丹明B（RhB）的降解速率和析氢速率分别比原始g-CN高约10倍和12倍。优异的光催化活性归因于上转换纳米粒子（UCNPs）和银纳米粒子（NPs）对g-CN光催化性能改性的协同效应，导致g-CN具有宽的光响应范围以及光诱导电子-空穴对快速分离和缓慢复合。本研究通过巧妙地将UCNPs、Ag NPs和g-CN组装成异质复合纳米结构，为制备具有高催化效率的g-CN基纳米复合光催化剂提供了新的见解。光催化活性的显著提高使g-CN在利用太阳能光催化降解有机污染物和产氢方面具有潜在应用。
