论文部分内容阅读
采用水热反应釜法制备碳量子点,然后通过碳量子点还原硝酸银制备CQDs/Ag复合催化剂。利用FT-IR、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亚甲基蓝浓度。结果表明:碳量子点表面具有含氧基团和具有还原性的基团,平均粒径约3.5nm,其吸收主要在紫外光区。CQDs/Ag复合催化剂能够使荧光猝灭,可见光区的吸收增强。在可见光照射下,复合催化剂比碳量子点的催化性能更好,CQDs/Ag复合催化剂在35min内能够使50mL 20mg/L的亚甲基蓝完全降解。
Hydrocarbon reactor was used to prepare carbon quantum dots, and then the CQDs / Ag composite catalyst was prepared by reducing the silver nitrate by carbon quantum dots. The samples were characterized by FT-IR and TEM. The fluorescence spectra were measured by fluorescence spectrophotometer. The absorption spectra and methylene blue concentration were measured by UV-Vis spectrophotometer. The results show that the surface of carbon quantum dots has oxygen-containing groups and reducible groups, the average particle size is about 3.5 nm, and the absorption is mainly in the ultraviolet region. The CQDs / Ag composite catalyst can quench the fluorescence and enhance the absorption in the visible region. Under visible light irradiation, the catalytic performance of the composite catalyst is better than that of the carbon quantum dots. The CQDs / Ag composite catalyst can completely degrade 50mL 20mg / L methylene blue within 35min.