氮掺杂碳点/富氮类石墨型氮化碳复合光催化剂的制备及产氢性能研究  

Preparation of nitrogen-doped carbon dots/nitrogen-rich graphite carbon nitride composite photocatalyst and its hydrogen production performance

作　　者：林雪 石春丽 刘畅[1] LIN Xue;SHI Chun-li;LIU Chang(College of Materials Science and Engineering,Beihua University,Jilin 132013,China)

机构地区：[1]北华大学材料科学与工程学院,吉林吉林132013

出　　处：《吉林师范大学学报（自然科学版）》2021年第3期16-22,共7页Journal of Jilin Normal University:Natural Science Edition

基　　金：国家自然科学基金项目(21407059)。

摘　　要：通过自下而上的方法,以g-C_(3)N_(5)为基质、柠檬酸为前驱体,制备了氮掺杂碳点(N-CDs)掺杂g-C_(3)N_(5)复合光催化剂.通过X射线粉末衍射仪、扫描电子显微镜、X射线光电子能谱、N2吸附-脱附等温线、紫外-可见光漫反射光谱及荧光光谱等对材料的组成、表面形貌和化学性能进行表征,以光分解水产氢实验研究了材料的光催化产氢性能.研究结果表明:0.125%N-CDs/g-C_(3)N_(5)复合光催化剂具有较多的活性位点,促进了光催化反应的电子传递过程,从而提高了材料的光催化产氢性能;N-CDs的掺杂提高了太阳光利用效率的同时进一步将电子-空穴对的高复合率降低,从而使光催化活性提高;在模拟可见光的光照射下,0.125%N-CDs/g-C_(3)N_(5)复合光催化剂的产氢量是g-C_(3)N_(5)的3.5倍.Through the bottom-up method,nitrogen-doped carbon dots(N-CDs)doped g-C_(3)N_(5) composite photocatalysts were prepared with g-C_(3)N_(5) as the matrix and citric acid as the precursor.The composition,surface morphology and chemical properties of the materials were characterized through X-ray powder diffraction,scanning electron microscope,X-ray photoelectron spectroscopy,N2 adsorption-desorption isotherm,ultraviolet-visible light diffuse reflectance spectrum and fluorescence spectrum.And the photocatalytic hydrogen production performance was studied by the experiment of photolysis of water to produce hydrogen.The research results show that the N-CDs/g-C_(3)N_(5) composite photocatalyst has more active sites,which promotes the electron transfer process of the photocatalytic reaction and improves the performance of photocatalytic hydrogen production.The doping of N-CDs improves the utilization efficiency of sunlight while further reducing the high recombination rate of electron-hole pairs,thereby increasing the photocatalytic activity.Under the light irradiation of simulated visible light,the hydrogen production of 0.125%N-CDs/g-C_(3)N_(5) composite photocatalyst is 3.5 times that of g-C_(3)N_(5).

关 键 词：氮掺杂碳点 石墨氮化碳 自下而上 产氢性能 富氮基团 

分 类 号：TQ116.2[化学工程—无机化工] O644.1[理学—物理化学]