原位复合制备CQDs/Ag的催化性能研究  

CQDs/Ag obtained by in-situ synthesis for photocatalytic applications

作　　者：董英鸽[1] 魏志佳 丁艳丽[1] 杨金龙[2] 胡胜亮[1] 

机构地区：[1]中北大学材料科学与工程学院,太原030051 [2]清华大学新型陶瓷与精细工艺国家重点实验室,北京100084

出　　处：《化工新型材料》2015年第8期137-139,共3页New Chemical Materials

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,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。CQDs were prepared in a autoclave,and CQDs/Ag composite catalysts were synthesized using CQDs as a reducing agent. The samples were detected by TEM and FTIR. Fluorescence and absorption spectra were recorded on a flu- orescence spectrophotometer and UV-Vis spectrometer, respectively. The results showed that there were many surface groups on the CQDs, such as oxygen group, reducing group, etc, the average diameter of CQDs was about 3.5nm, absorption spectrum mainly lied in ultraviolet region. Fluorescence quenching happened after incorporating Ag into CQDs,and absorp- tion capacity was strengthen in visible light wavelength range. Photocatalytic property of catalysts became stronger than CQDs under visible light irradiation. The composite catalyzed methylene blue of 50mL, 20 mg/L degraded in 35minutes completely.

关 键 词：碳量子点 CQDs/Ag 催化性能 

分 类 号：O643.36[理学—物理化学]