大比表面积介孔g-C_(3)N_(4)材料的制备及其产氢性能  

Preparation of mesoporous g-C_(3)N_(4)materials with a large specific surface area and their hydrogen production performance

作　　者：王聪[1] 颉启东 傅雅琴[1] 司银松 WANG Cong;XIE Qidong;FU Yaqin;SI Yinsong(School of Materials Science&Engineering,Zhejiang Sci-Tech University,Hangzhou 310018,China)

机构地区：[1]浙江理工大学材料科学与工程学院,杭州310018

出　　处：《浙江理工大学学报（自然科学版）》2023年第6期665-673,共9页Journal of Zhejiang Sci-Tech University(Natural Sciences)

基　　金：国家自然科学基金项目(52003243);浙江省自然科学基金项目(LQ21E030010)。

摘　　要：为获得大比表面积和优异产氢性能的石墨相氮化碳(g-C_(3)N_(4)),将单氰胺和甲醛溶液溶入二氧化硅(SiO_(2))溶胶,形成单氰胺、甲醛和SiO_(2)凝胶组成的杂化前驱体,并将该杂化前驱体在通气条件下煅烧以制备介孔g-C_(3)N_(4)(命名为VCN),在密闭条件下煅烧以制备介孔g-C_(3)N_(4)(命名为ACN);利用透射电镜、X射线衍射仪、傅里叶变换红外光谱等对介孔g-C_(3)N_(4)的形貌、晶体结构等进行表征,通过荧光光谱和气相色谱仪等分析介孔g-C_(3)N_(4)的产氢性能。结果表明:VCN在获得大比表面积(约312 m^(2)/g)的同时,拓宽了光吸收范围(约760 nm),提高了光致电子-空穴对分离效率。加入40 mg甲醛的VCN(VCN-40)具有最佳的产氢速率,为2826μmol/(h·g),比通气条件下未加入甲醛的g-C_(3)N_(4)(VCN-0)提高了1.8倍。研究结果为开发高产氢效率g-C_(3)N_(4)基复合催化剂提供了有益参考。To obtain graphitic carbon nitride(g-C_(3)N_(4))with a large specific surface area and excellent hydrogen production property,the solution of cyanamide and formaldehyde was dissolved into the silica(SiO_(2))sol,and a hybrid precursor composed of cyanamide,formaldehyde and SiO_(2)gel was formed.Mesoporous g-C_(3)N_(4)obtained by calcination of the hybrid precursor under ventilation condition(named VCN)and that under airtight condition(named ACN)were obtained.The morphology and crystal structure of mesoporous g-C_(3)N_(4)were characterized with transmission electron microscope,X-ray diffractometer and Fourier transform infrared spectroscopy.The hydrogen production properties of mesoporous g-C_(3)N_(4)were tested by fluorescence spectra and gas chromatography.The results show that VCN not only has a large specific surface area(about 312 m^(2)/g),but also broadens the light absorption range(about 760 nm)and improves the separation efficiency of the photoinduced electron-hole pairs.Specifically,VCN with 40 mg formaldehyde(VCN-40)possesses the highest hydrogen production rate of 2826μmol/(h·g),which is 1.8 times higher than that of g-C_(3)N_(4)without formaldehyde under ventilation condition(VCN-0).This study provides useful reference for the development of g-C_(3)N_(4)-based composite catalysts with high hydrogen efficiency.

关 键 词：g-C_(3)N_(4) SiO_(2)溶胶 甲醛 多孔结构 热聚合过程 产氢性能 

分 类 号：O643.36[理学—物理化学]