碳量子点及其功能化与银复合的催化性能  

Original and Functional CQDs@Ag Composite Nanostructure for Photocatalytic Applications

作　　者：董英鸽[1] 杨金龙[2] 魏志佳 丁艳丽[1] 胡胜亮[1] 

机构地区：[1]中北大学,山西太原030051 [2]清华大学,北京100084

出　　处：《稀有金属材料与工程》2017年第1期219-224,共6页Rare Metal Materials and Engineering

基　　金：国家自然科学基金(51272301;51172120)

摘　　要：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混合,制成复合催化剂。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3.5 nm,类球形银纳米粒子的平均粒径约18 nm。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体积比为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,降解完50 mg/L,50 mL的甲基橙仅需12 min。Orignal CQDs and functionalized CQDs with SOCl_2（Cl-CQDs） were prepared in an autoclave, and silver nanoparticles were synthesized using ethylene glycol as a reducing agent. Ag/CQDs and Ag/Cl-CQDs were synthesized by simple mixing. 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 show that the average diameter of CQDs is about 3.5 nm, and the mean diameter of roundish silver nanoparticles is about 18 nm. Fluorescence quenching happens after incorporating Ag into CQDs, and absorption capacity is strengthened in the visible light wavelength range. The photocatalytic property of the composite catalysts is stronger than that of single Ag and CQD.The composite catalyst with a volume ratio of Ag/CQDs of 1/2 has the highest catalytic efficiency. Ag/Cl-CQDs can promote the degradation of methyl orange, and 50 m L, 50 mg/L methyl orange is degraded in 12 min.

关 键 词：碳量子点 银纳米粒子 光催化性能 

分 类 号：O643.36[理学—物理化学] TB383.1[理学—化学]