高比表面积g-C_3N_4纳米片的制备及光解水制氢性能的研究  

Preparation of g-C_3N_4 nanosheets with a high specific area and their photocatalytic hydrogen evolution

作　　者：高星星[1] 王舰[2] 徐红波[3] 余江龙[3] 

机构地区：[1]辽宁科技大学土木工程学院,鞍山114051 [2]辽宁科技大学矿业工程学院,鞍山114051 [3]辽宁科技大学化学工程学院,鞍山114051

出　　处：《化工新型材料》2017年第8期41-43,共3页New Chemical Materials

基　　金：辽宁省自然科学基金(2015020577);辽宁省教育厅科学研究项目(2013122)

摘　　要：通过浓硫酸剥离块状类石墨相氮化碳(g-C_3N_4)制备了产率较高的g-C_3N_4纳米片;通过X射线衍射(XRD)、透射电镜(TEM)、红外光谱(FT-IR)、紫外-可见漫反射光谱(UV-Vis)、物理吸附仪(BET)、光电流等分析测试手段对g-C_3N_4纳米片和块状g-C_3N_4的结构、形貌、光学性质和光电性能进行了分析,并以光解水制氢性能评价了其可见光催化活性。结果表明,g-C_3N_4纳米片具有较大的比表面积(244.3m^2/g)和较小的片层厚度,带隙宽度增大到3.19eV,g-C_3N_4纳米片的光电流是块状g-C_3N_4的3.1倍,平均产氢速率为469μmol/(g·h),是块状g-C_3N_4的4.2倍。g-C3N4 nanosheets were prepared on a large scale via a concentrated sulfuric acid exfoliation route.The structure,morphology,optical and photoelectric properties of g-C3N4 nanosheets and bulk g-C3N4 samples were characterized in detail by physicochemical means,such as X-ray diffraction,transmission electron microscope,fourier transform infrared spectroscopy,UV-Vis diffuse reflectance spectroscopy,physical sorption and photocurrent response.Their photocatalytic activities was evaluated by evolution of hydrogen under visible light.Compared to the bulk g-C3N4,the g-C3N4 nanosheets possessed a high specific surface area of 244.3 m^2/g with the smaller piece of layer thickness and a larger bandgap（3.19eV）.The photocurrent of g-C3N4 nanosheets was enhanced by 3.1times.The average hydrogen evolution rate of nanosheets was 469μmol·g^（-1）·h^（-1）,which was 4.2 times higher than that of the bulk g-C3N4.

关 键 词：类石墨相氮化碳 纳米片 光解水制氢 

分 类 号：O643.36[理学—物理化学] TQ116.2[理学—化学]