摘要
采用光沉积法和原位还原法制备负载型光催化剂Ag掺杂石墨相氮化碳(Ag/g-C_3N_4),并考察其在可见光区内对亚甲基蓝的光降解性能的影响机制。利用XRD、FT-IR、N_2吸附、SEM和XPS等手段表征Ag/g-C_3N_4样品,考察Ag掺杂方式和Ag掺杂量对亚甲基蓝的光降解活性和催化剂Ag/g-C_3N_4稳定性的影响。结果表明,Ag/g-C_3N_4对亚甲基蓝的光降解活性随着Ag掺杂量的增大而增大,光沉积法比原位还原法制备的光催化剂Ag/g-C_3N_4对亚甲基蓝可见光催化活性更好,经过5次循环实验后光催化活性未明显失活。这归因于前者制备的Ag纳米粒子更均匀的分布在g-C_3N_4表面从而抑制光生电子-空穴对的复合和促进光生电子的快速移除,Ag粒子在光照条件下产生的表面等离子体共振波效应也能提高催化剂Ag/g-C_3N_4的光降解效率。
The supported catalyst Ag/g-C3N4,Ag doped graphite carbon nitride,were prepared by the photo-reduction route and in situ reduction method,and performed on the photodegredation mechanism of methylene blue under visible-light region.Ag/g-C3N4 samples were characterized by several techniques such as XRD,FT-IR,N2-adsorption,ICP-OES,TEM and XPS. The effects of Ag-doped route and doping dosage of Ag on the photocatalytic activity and stability for the degradation of methylene blue under visible-light irradiation were performed. The results indicated that the photodegradation activity of Ag/g-C3N4 increased with the increasing of doping dosage of Ag. Compared with Ag/g-C3N4 prepared by in situ reduction route,Ag/g-C3N4 synthesized by photodecomposition route exhibited better photocatalytic activity and stability for the degradation of methylene blue under visiblelight irradiation. It＇s ascribed to the small particles dispersed on g-C3N4 surface for the suppression of photo electron combined with holes and the surface plasmon resonance（ SPR） effect of visible-light droved for the enhancement in photo-catalytic efficiency of Ag/g-C3N4.
出处
《化工新型材料》
CAS
CSCD
北大核心
2017年第7期180-183,共4页
New Chemical Materials
基金
国家自然科学基金(21506103)
四川省科技厅重大科技支撑计划(2015GZ0170)
