基于等离子体型Ag@AgBr插层K4Nb6O17的可控合成及光催化性能

在微波辅助条件下采用离子交换和光致还原的方法将Ag@AgBr纳米粒子插层进入K4Nb6O17层间,制备了具有等离子体共振效应的可见光催化剂(记作K4Nb6O17/Ag@AgBr).在胺交换过程中采用不同链长的有机胺对酸交换产物进行柱撑,通过铌酸钾层间距的变化实现层间Ag@AgBr纳米粒子的形貌调控.利用XRD,SEM,EDX,UV-Vis等手段对复合催化剂进行结构、形貌和性质分析,并对复合光催化剂进行了可见光降解亚甲基蓝、甲基橙和苯酚的性能研究.结果表明:改性后的复合光催化剂在可见光区的响应大大增强;3种复合光催化剂对目标污染物均具有良好的可见光催化活性,其中十二胺柱撑的Ag@AgBr插层K4Nb6O17复合光催化剂对亚甲基蓝的移除效果最好.

Controllable Fabrication of Plasmonic Ag@AgBr intercalated K4Nb6O17 and there photocatalytic performance

The Ag@AgBr intercalated K4Nb6O17 plasmonic photocatalysts (donated as K4Nb6O17/Ag@AgBr) were synthesized via a microwave-assisted ion-exchange method and photoreduction method. Different organic amines were used in the process of amine pillared H4Nb6O17, the particle size of the Ag@AgBr located in the layered K4Nb6O17 can be tuned. The composites were characterized by using XRD, SEM, EDX, TEM, UV-Vis, and PL methods. The photocatalytic activities of the samples were evaluated by the degradation of methylene blue, methyl orange and phenol. The results show that the as-prepared photocatalysts showed enhanced absorption response and good photocatalytic activities for the degradation of the targeted pollutants in visible light region. The dodecylamine pillared K4Nb6O17/Ag@AgBr composite photocatalyst showed the highest photocatalytic activity for the degradation of methylene blue.