中文摘要：

采用两种碳源合成的碳量子点作为光还原剂,在可见光照射下还原硝酸银（Ag NO3）制备出了两种不同尺寸的银/碳量子点（Ag/CDs）复合结构。透射电镜（TEM）结果表明获得了两种尺寸不同的Ag与CDs复合结构。紫外-可见吸收光谱表明尺寸较小的复合结构在可见光区域展现出了更强的光吸收,从而导致了尺寸较小的Ag/CDs复合结构在可见光下对亚甲基兰拥有更强的光降解能力。

英文摘要：

Two kinds of composite structures composed of CDs and silver（named as Ag/CDs） were prepared by mixing CDs derived from two different carbon sources and Ag＋solution under visible-light irradiation.TEM images reveal that two kinds of Ag/CDs have different sizes.UV-Vis spectra indicate that the small-sized Ag/CDs exhibit stronger light absorption in the visible light region.This results in significantly enhancing photocatalitic activity in the decomposition of methylene blue（MB） under visiblelight irradiation.