Enhanced visible light photocatalytic activity of novel polymeric g-C3N4 loaded with Ag nanoparticles
Enhanced visible light photocatalytic activity of novel polymeric g-C3N4 loaded with Ag nanoparticles
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负载Ag纳米颗粒的新型聚合物g-C3N4增强可见光催化活性
DOI：
10.1016/j.apcata.2011.10.006
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发表时间：
2011-12-15
影响因子：
5.5
通讯作者：
Li, Yunfeng
中科院分区：
文献类型：
--
作者：
Ge, Lei;Han, Changcun;Li, Yunfeng
采用简易加热法制备了负载贵金属Ag纳米粒子的新型高分子g-C3 N4光催化剂。采用X射线衍射（XRD）、扫描电子显微镜（SEM）、透射电子显微镜（TEM）、高分辨透射电子显微镜（HRTEM）等对Ag/g-C3 N4复合材料进行了表征。X射线光电子能谱（XPS）。紫外-可见漫反射光谱（DRS）和光致发光光谱（PL）。在可见光照射下，以甲基橙橙子的降解和氢气的生成为目标，研究了Ag/g-C3 N4的光催化活性。XPS结果表明，在聚合物g-C_3 N_4上沉积的是金属Ag-0。与纯g-C3 N4相比，Ag/g-C3 N4光催化剂对甲基橙橙子的降解和产氢性能有显著提高。确定了最佳Ag含量为1.0wt%，对应的析氢速率为10.105 μ mol·h（-1），比纯g-C_3 N_4的析氢速率高11.7倍以上。Ag和g-C3 N4之间的协同作用促进了光生载流子的迁移，从而提高了光催化剂的光催化性能。光致发光光谱进一步证实了少量Ag改性g-C3 N4可见光催化活性增强的机理。(C)2011 Elsevier B. V.保留所有权利。
Novel polymeric g-C3N4 photocatalysts loaded with noble metal Ag nanoparticles were prepared via a facile heating method. The obtained Ag/g-C3N4 composite products were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM), high resolution transmission electron microscopy (HRTEM). X-ray photoelectron spectroscopy (XPS). UV-vis diffuse reflection spectra (DRS) and photoluminescence spectra (PL). The photocatalytic activities of Ag/g-C3N4 samples were investigated based on the decomposition of methyl orange and hydrogen evolution under visible light irradiation. The XPS results revealed that it was the metallic Ag-0 deposited on polymeric g-C3N4 samples. The Ag/g-C3N4 photocatalysts exhibited significantly enhanced photocatalytic performance for the degradation of methyl orange and hydrogen production compared with pure g-C3N4. The optimal Ag content was determined to be 1.0 wt%, and the corresponding hydrogen evolution rate was 10.105 mu mol h(-1), which exceeded that of pure g-C3N4 by more than 11.7 times. The enhanced photocatalytic performance could be attributed to the synergic effect between Ag and g-C3N4, which promoted the migration efficiency of photo-generated carriers. The proposed mechanism for the enhanced visible light photocatalytic activity of g-C3N4 modified by a small amount of Ag was further confirmed by photoluminescence spectroscopy. (C) 2011 Elsevier B.V. All rights reserved.