碳量子点及其功能化与银复合的催化性能研究

采用水热反应釜法制备碳量子点以及氯化亚砜功能化碳量子点，然后分别与用乙二醇还原的银纳米粒子进行复合，利用FTIR、TEM对样品进行表征，利用荧光分光光度计测试荧光谱，紫外-可见分光光度计测试吸收谱和甲基橙浓度。结果表明：碳量子点的平均粒径约3.5nm，类球形银纳米粒子的平均粒径约18nm。银纳米粒子和碳量子点复合催化剂能够使荧光猝灭，使可见光区的吸收增强。复合催化剂比单独的银纳米粒子和碳量子点的催化能力更好。银纳米粒子和碳量子点以1：2的比例复合时催化效率最高。氯化亚砜功能化的碳量子点与银纳米粒子复合能提高降解甲基橙的浓度和降解速率，12分钟内降解完50mL，50mg/L的甲基橙。

Original and Functional CQDs@Ag Composite Nanostructure for Photocatalytic Applications

Orignal CQDs and functionalized CQDs with SOCl2 (Cl-CQDs ) were prepared in a autoclave, and silver nanoparticles were synthesized using ethylene glycol as a reducing agent. Ag /CQDs and Ag /Cl-CQDs were synthesized by simple mixing respectively. The samples were detected by TEM and FTIR. Fluorescence and absorption spectra were recorded on a fluorescence spectrophotometer and UV-Vis spectrometer, respectively. The results showed that the average diameter of CQDs was about 3.5 nm, and the mean diameter of roundish silver nanoparticles was about 18 nm. Fluorescence quenching happened after incorporating Ag into CQDs, and absorption capacity was strengthen in visible solar wavelength range. Comparing with single Ag and CQDs, Photocatalytic property of composite catalysts became stronger. The composite catalyst with a mass ratio of Ag /CQDs of 1/2 had the highest catalytic efficiency. Ag/Cl-CQDs can promote the degradation of methyl orange, and 50 mL, 50 mg/L methyl orange was degraded in 12 minutes.