多级Ag/Bi/氮空位g-C_(3)N_(4)/Ti_(3)C_(2)T_(x)肖特基结的构筑及其全光谱催化性能  

Construction and full-spectrum catalytic performance of multilevelAg/Bi/nitrogen vacancy g-C_(3)N_(4)/Ti_(3)C_(2)T_(x)Schottky junction

作　　者：王敏 辛德华 石雅宁 朱文垚 张苑群 章薇 WANG Min;XIN Dehua;SHI Yaning;ZHU Wenyao;ZHANG Yuanqun;ZHANG Wei(Department of Applied Chemistry,Yuncheng University,Yuncheng,Shanxi 044000,China)

机构地区：[1]运城学院应用化学系,运城044000

出　　处：《无机化学学报》2024年第6期1123-1134,共12页Chinese Journal of Inorganic Chemistry

基　　金：山西省基础研究计划项目(No.202303021222243);山西省高等学校科技创新项目(No.2023L306);运城学院优秀博士来晋科研专项(No.QZX-2023014)资助。

摘　　要：采用原位溶剂热反应制备多级Ag/Bi/Nv-g-C_(3)N_(4)(氮空位-g-C_(3)N_(4))/Ti_(3)C_(2)T_(x)肖特基结,并对其物相组成和晶体结构、微观形貌和孔结构、表面元素组成和化学态、光学和光电化学性质进行了表征。由于Ag、Bi和Ti_(3)C_(2)T_(x)协同的表面等离激元共振效应,Ag/Bi/Nv-g-C_(3)N_(4)/Ti_(3)C_(2)T_(x)表现出全光谱吸收特性。由载流子浓度差驱动的界面极化电荷转移诱导形成的肖特基结,显著提高了光生载流子(包括热电子和热空穴)的分离效率和利用率。因此,与Nv-g-C_(3)N_(4)、Ti_(3)C_(2)T_(x)、Ag/Nv-g-C_(3)N_(4)、Bi/Nv-g-C_(3)N_(4)和Ag/Bi/Nv-g-C_(3)N_(4)相比,Ag/Bi/Nv-g-C_(3)N_(4)/Ti_(3)C_(2)T_(x)表现出显著增强的全光谱催化活性,其在可见光和近红外光照射下光催化降解四环素的反应速率常数分别为0.033和0.0086 min^(-1),为对比样品的10~2.1倍和8.6~1.8倍。The multilevel Ag/Bi/Nv-g-C_(3)N_(4)/Ti_(3)C_(2)T_(x)(Nv-g-C_(3)N_(4):nitrogen vacancy-g-C_(3)N_(4))Schottky junction was pre-pared via an in-situ solvothermal reaction.The phase composition and crystal structure,micromorphology and pore structure,surface elemental composition and chemical state,and optical and photoelectrochemical properties were characterized.The prepared Ag/Bi/Nv-g-C_(3)N_(4)/Ti_(3)C_(2)T_(x)exhibited full-spectrum absorption characteristics owing to the synergistic surface plasmon resonance effect between Ag,Bi,and Ti_(3)C_(2)T_(x).Moreover,the Schottky junction was formed through the interface polarization charge transfer driven by carrier concentration difference,resulting in the markedly improved separation efficiency and utilization of photogenerated carriers(including hot electrons and hot holes).Consequently,in comparison to Nv-g-C_(3)N_(4),Ti_(3)C_(2)T_(x),Ag/Nv-g-C_(3)N_(4),Bi/Nv-g-C_(3)N_(4),and Ag/Bi/Nv-g-C_(3)N_(4),Ag/Bi/Nv-g-C_(3)N_(4)/Ti_(3)C_(2)T_(x)showed significantly enhanced full-spectrum-driven photocatalytic activity,and the reaction rate constants for photocatalytic degradation of tetracycline under visible light and near-infrared light irradiation could reach 0.033 and 0.0086 min^(-1),respectively,which were approximately 10-2.1 times and 8.6-1.8 times higher than those of contract samples.

关 键 词：肖特基结 表面等离激元共振 全光谱催化 盐酸四环素 

分 类 号：O643.3[理学—物理化学]