论文部分内容阅读
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。
The carbon quantum dots and thionyl chloride functionalized carbon quantum dots were prepared by a hydrothermal reactor method and then mixed with silver nano-particles reduced with ethylene glycol respectively to form a composite catalyst. The samples were characterized by FTIR and TEM. The fluorescence spectra were measured by fluorescence spectrophotometer. The absorption spectra and the concentration of methyl orange were measured by ultraviolet - visible spectrophotometer. The results show that the average size of carbon quantum dots is about 3.5 nm and the average size of spherical silver nanoparticles is about 18 nm. Silver nanoparticles and carbon quantum dots composite catalyst can quench the fluorescence, the absorption in the visible region enhanced. The catalytic activity of the composite catalyst is better than silver nanoparticles and carbon quantum dots alone. Silver nanoparticles and carbon quantum dots in the volume ratio of 1: 2 ratio of the composite catalytic efficiency of the highest. Thionyl chloride functionalized carbon quantum dots with silver nanoparticles can increase the degradation of methyl orange concentration and degradation rate, degradation of 50 mg / L, 50 mL of methyl orange only 12 min.