Monodisperse bismuth nanoparticles decorated graphitic carbon nitride: Enhanced visible-light-response photocatalytic NO removal and reaction pathway
Monodisperse bismuth nanoparticles decorated graphitic carbon nitride: Enhanced visible-light-response photocatalytic NO removal and reaction pathway
复制标题
单分散铋纳米颗粒装饰石墨氮化碳：增强可见光响应光催化NO去除和反应途径
DOI：
10.1016/j.apcatb.2017.01.009
复制
发表时间：
2017-05-15
影响因子：
22.1
通讯作者：
Zhang, Sen
中科院分区：
文献类型：
--
作者：
Jiang, Guangming;Li, Xinwei;Zhang, Sen
我们报道了一种简单的单分散铋纳米颗粒(BiNPs)修饰的石墨化碳氮化碳(g-C3N4)光催化剂的方法，并在可见光照射下，在连续气流中高效地脱除ppb级的NO。光催化剂是在有机胶体溶液中通过尺寸可控的方法合成的，然后将它们组装在g-C3N4上。掺入BiNPs可显著提高g-C3N4的光催化活性，其机制是通过构建Big-C3N4异质结(异质结效应)及其表面等离子体共振效应(SPR效应)，促进g-C3N4中光激发电子/空穴的分离。此外，调节BiNPs的尺寸可以精确地控制SPR的异质结密度和强度，从而成功地识别和优化每种效应对光催化的贡献。在相同条件下，12 nm BiNPs修饰g-C3N4对NO的脱除效率高达60.8%，远高于较小或较大的BiNPs修饰g-C3N4和裸露g-C3N4(38.6%)。这项工作强调了一种NP尺寸控制策略来调节金属NPs-半导体光催化中的协同异质结和SPR效应，该策略可以推广到设计高效且经济实惠的光催化系统来净化许多其他大气污染物。(C)2017爱思唯尔B.V.保留所有权利。
We report a facile approach to monodisperse bismuth nanoparticles (Bi NPs)-decorated graphitic carbon nitride (g-C3N4) photocatalyst, and its high efficiency in removing ppb-level NO in a continuous gas flow under visible light illumination. The photocatalyst is prepared via a size-controllable synthesis of Bi NPs in organic colloidal solution and a subsequent assembly of them on g-C3N4. The incorporation of Bi NPs can significantly enhance the photocatalytic activity of g-C3N4 via the construction of Bi-g-C3N4 heterojunction (heterojunction effect) and their surface plasmon resonance effect (SPR effect), both of which can promote the separation of photoexcited electron/hole in g-C3N4. Furthermore, tuning the size of Bi NPs allows the precise control of the heterojunction density and the intensity of SPR, and thus the successful identification and optimization of the contribution of each effect to the photocatalysis. 12 nm Bi NPs-decorated g-C3N4 can achieve an exceptional NO removal efficiency of 60.8%, much higher than those of smaller or larger Bi NPs decorated g-C3N4 and the bare g-C3N4 (38.6%) under the same condition. This work highlights a NP size-controlled strategy to tuning the synergistic heterojunction and SPR effect in metal NPs-semiconductor photocatalysis, which could be generalized in designing efficient and cost-effective photocatalytic systems for the clean-up of many other atmospheric pollutants. (C) 2017 Elsevier B.V. All rights reserved.