Department of Physics, University of Mumbai, Vidyanagari, Santacruz (E), Mumbai, 400098, India.
Department of Physics, University of Mumbai, Vidyanagari, Santacruz (E), Mumbai, 400098, India.
J Environ Manage. 2019 Oct 1;247:57-66. doi: 10.1016/j.jenvman.2019.06.043. Epub 2019 Jun 21.
Three material engineering strategies in the form of doping (Boron-doping), nanostructuring (nanosheet (NS) formation) and decorating with plasmonic nanoparticles (loading with Ag metal), were integrated to improve the photocatalytic activity of graphitic carbon nitride (gCN). Concentrations of B-doping and Ag-loading were optimized to maximize the catalytic performance in the final nanocomposite of Ag-loaded B-doped gCN NS. Combined effect of all three strategies successfully produced over 5 times higher rate towards degradation of organic dye pollutant, when compared to unmodified bulk gCN. Detailed characterization results revealed that incorporation of B in gCN matrix reduces the band gap to increase the visible light absorption, while specific surface area is significantly enhanced upon formation of NS. Decoration of Ag nanoparticles (NPs) on B-doped gCN NS assists in fast transfer of photogenerated electrons from gCN to Ag NPs owing to the interfacial electric field across the junctions and thus reduces the recombination process. Investigations on individual strategies revealed that decoration of Ag NPs to induce better charge separation, is the most effective route for enhancing the photocatalytic activity.
采用掺杂（硼掺杂）、纳米结构化（纳米片（NS）形成）和等离子体纳米粒子修饰（负载 Ag 金属）三种材料工程策略，来提高石墨相氮化碳（gCN）的光催化活性。优化了 B 掺杂和 Ag 负载的浓度，以在最终的 Ag 负载 B 掺杂 gCN NS 纳米复合材料中最大化催化性能。与未改性的块状 gCN 相比，所有三种策略的综合效果成功地使有机染料污染物的降解速率提高了 5 倍以上。详细的特征化结果表明，B 掺入 gCN 基体可降低带隙以增加可见光吸收，而 NS 的形成则显著提高了比表面积。在 B 掺杂的 gCN NS 上修饰 Ag 纳米粒子（NPs）有助于由于界面电场在结处，从 gCN 到 Ag NPs 的光生电子快速转移，从而减少了复合过程。对各个策略的研究表明，修饰 Ag NPs 以诱导更好的电荷分离，是提高光催化活性的最有效途径。
