NCDs/TiO_2复合材料的制备及其在太阳光下催化制氢的应用  

Nitrogen Doped Carbon Quantum Dots/Titanium Dioxide Composites for Hydrogen Evolution under Sunlight

作　　者：魏婕[1] 李雪冬[1] 王宏志[1] 张青红[2] 李耀刚[1] 

机构地区：[1]东华大学材料科学与工程学院纤维材料改性国家重点实验室,上海201620 [2]东华大学先进玻璃制造技术教育部工程研究中心,上海201620

出　　处：《无机材料学报》2015年第9期925-930,共6页Journal of Inorganic Materials

基　　金：国家自然科学基金(51172042);高等学校学科创新引智计划资助(111-2-04);高等学校博士学科点专项科研基金(20110075130001);教育部创新团队发展计划(IRT1221);上海市科委项目(12nm0503900;13JC1400200);中央高校基本科研业务费~~

摘　　要：采用溶剂热法,以乙腈为溶剂和葡萄糖为原料制备了粒径约4 nm的氮掺杂碳量子点NCDs。当激发波长从330 nm增加到470 nm,NCDs水溶液发射光谱出现红移。随后,将一定配比的NCDs、TiO2及5 m L超纯水超声混合60 min,并在80℃烘箱内陈化24 h,NCDs纳米颗粒成功地复合到TiO2(TiO2)表面。该方法有效地拓宽了TiO2吸收光谱的范围,并且减少了光生电子和空穴对,从而增强了TiO2的光催化制氢性能。实验结果表明:投料比为m(NCDs):m(TiO2)=15:85时,以甲醇为牺牲剂的反应体系光催化制氢效果最好,该复合材料具有一定的稳定性,循环三次使用后仍然有一定的光催化制氢性能。Using acetonitrile as the solvent and glucose as the raw material, nitrogen doped carbon quantum dots（NCDs） were prepared by the solvothermal method. The size of NCDs is around 4 nm. The emission spectrum of NCDs showed red shift when the excitation wavelength of quantum dots increased from 330 nm to 470 nm. Titanium dioxide was coated by NCDs by mixing a certain proportion of NCDs, TiO2 and ultrapure water through 60 min ultrasonic and aging under 80℃ for 24 h. NCDs/titanium dioxide composites show good photocatalyst performance as compared with pure NCDs and pure titanium dioxide, because the NCDs can expand the absorption spectrum and reduce the photogenerated electrons and holes. The NCDs/TiO2 composites at the raw ratio of m（NCDs）：m（TiO2）=15：85 show the best hydrogen evolution performance, using methanol as the sacrificial agent. The composite material displays good stability and certain photocatalytic performance after three cycles.

关 键 词：NCDs 碳量子点/TiO2复合材料 太阳光催化制氢 溶剂热合成 

分 类 号：TQ127[化学工程—无机化工]