S掺杂g-C_(3)N_(4)光催化剂的制备及性能研究  

Study on Preparation and Performance of S-doped g-C_(3)N_(4) Photocatalyst

作　　者：王海军[1,3] 杨延宁[1,2] 张富春 樊钰[1] 胡崇阳 WANG Haijun;YANG Yan-ning;ZHANG fu-chun;FAN Yu;HU Chong-yang(School of Physics and Electronic Information,Yan'an University,Yan'an Shaanxi 716000,China;School of Electronics and-information,Nanchang Institute of Technology,Nanchang Jiangxi 330044,China;Xi'an Innovation College,Yan'an University,Xi'an Shaanxi 710100,China)

机构地区：[1]延安大学物理与电子信息学院,陕西延安716000 [2]南昌理工学院电子与信息学院,江西南昌334400 [3]延安大学西安创新学院,陕西西安710100

出　　处：《当代化工》2023年第8期1857-1860,1881,共5页Contemporary Chemical Industry

基　　金：国家自然科学基金(项目编号:62264015)。

摘　　要：为了提升g-C_(3)N_(4)的光催化性能,采用一步热聚合法制备了S掺杂g-C_(3)N_(4)来改进其光催化性能。利用X射线衍射(XRD)、扫描电子显微镜(SEM)和紫外-可见吸收光谱(UV)分析了g-C_(3)N_(4)和S掺杂g-C_(3)N_(4)的形貌和功能。研究了g-C_(3)N_(4)和S掺杂g-C_(3)N_(4)对罗丹明B(RhB)溶液的光催化效果。实验结果表明,S掺杂g-C_(3)N_(4)的光催化降解效率由g-C_(3)N_(4)的52.38%提高至90.1%。扫描电子显微镜测试表明构成S掺杂g-C_(3)N_(4)的片层变得更薄且出现了团聚现象,使其比表面积增大。X射线衍射分析表明S掺杂g-C_(3)N_(4)结晶度有所提高。紫外-可见光谱表明光响应由g-C_(3)N_(4)对应的459 nm扩展至S掺杂g-C_(3)N_(4)对应的477 nm,禁带宽度由2.70 eV减小至2.60 eV。表征结果表明,S掺杂g-C_(3)N_(4)光催化活性增强的原因可能是S元素掺杂使其比表面积增大,结晶度提高,光响应范围扩大使得禁带宽度减小,进而使光生电子-空穴对分离加快等。但过量S元素掺杂将导致光催化性能下降,原因可能是过量的S元素掺杂使S成为光生电子-空穴对的复合中心。In order to improve the photocatalytic performance of g-C_(3)N_(4),S-doped g-C_(3)N_(4) was prepared through a one-step thermal polymerization method.The morphology and function of g-C_(3)N_(4) and S-doped g-C_(3)N_(4) were analyzed using scanning electron microscopy,UV spectroscopy,and X-ray diffraction.The photocatalytic effect of g-C_(3)N_(4) and S-doped g-C_(3)N_(4) on Rhodamine B(RhB)solution was studied.The experiment showed that the photocatalytic degradation efficiency of S-doped g-C_(3)N_(4) increased from 52.38% of g-C_(3)N_(4) to 90.1%.Scanning electron microscopy testing showed that the layers composed of S-doped g-C_(3)N_(4) became thinner and agglomerated,resulting in an increase in their specific surface area.X-ray diffraction analysis shows that the crystallinity of S-doped g-C_(3)N_(4) was improved.The ultraviolet visible spectrum showedthat the light response extendedfrom 459 nm corresponding to g-C_(3)N_(4) to 477nm corresponding to S-doped g-C_(3)N_(4),and the band gap decreasedfrom 2.70 eV to 2.60 eV.In conclusion,the reason for the enhanced photocatalytic activity of S-doped g-C_(3)N_(4) was that the specific surface area and crystallinity of S-doped g-C_(3)N_(4) increased,and the band gap decreaseddue to the expansion of the light response range,thus accelerating the separation of photogenerated electron hole pairs.However,excessive S element doping couldlead to a decrease in photocatalytic performance,possibly due to excessive S element doping making S be a composite center for photo generated electron hole pairs.

关 键 词：掺杂 g-C_(3)N_(4) 光催化 降解 

分 类 号：TQ426.7[化学工程]