原位制备SrSb_(2)O_(6)/g-C_(3)N_(4)新型二维异质结用于可见光催化降解四环素的研究  

In-site Preparation of Novel Two Dimensional Heterojunction SrSb_(2)O_(6)/g-C_(3)N_(4) for the Photodegradation of Tetracycline under Visible Light Irradiation

作　　者：任彦荣 沈金凤 杨军 全纹萱 曾寒露 刁悦 蒲红争 胡颖 王星雅 李园园 Ren Yanrong;Shen Jinfeng;Yang Jun;Quan Wenxuan;Zeng Hanlu;Diao Yue;Pu Hongzheng;Hu Ying;Wang Xingya;Li Yuanyuan(College of Biological and Chemical Engineering,Chongqing University of Education,Chongqing,400067;College of Pharmacy and Bioengineering,Chongqing University of Technology,Chongqing,400054)

机构地区：[1]重庆第二师范学院生物与化学工程学院,重庆400067 [2]重庆理工大学药学与生物工程学院,重庆400054

出　　处：《化学通报》2021年第7期709-714,共6页Chemistry

基　　金：重庆市教委科学技术研究项目(KJQN202001613);重庆第二师范学院博士启动基金项目(2017BSRC001);重庆第二师范学院大学生科研项目(KY20200138,KY20200139)资助;教育部学校规划建设发展中心重庆第二师范学院儿童研究院重点资助项目(CSDP19FS01109)。

摘　　要：本文采用高温固相原位制备新型二维SrSb_(2)O_(6)/g-C_(3)N_(4)异质结光催化复合材料,并将其用于可见光催化降解四环素。通过XRD和FT-IR谱对其结构进行表征。光催化降解实验表明,异质结复合材料较母体g-C_(3)N_(4)和SrSb_(2)O_(6)而言,光催化效率均得到了提升。其中,异质结样品SSO-CN-2对四环素溶液具有最优的光催化降解效率,其降解率在240min达到62%,分别是母体g-C_(3)N_(4)和SrSb_(2)O_(6)的2.5和46.0倍。光催化动力学实验表明,其降解曲线符合准一级动力学模型,速率常数为3.920×10^(-3)min^(-1)。循环实验表明,异质结样品的光催化降解性能表现稳定并且结构稳定性较高。活性自由基捕获实验表明,·O^(-)_(2)是主要催化反应的活性物种,光催化机理可用半导体异质结Type-II类型得到解释。In this paper, a series of novel two-dimensional SrSb_(2)O_(6)/g-C_(3)N_(4) heterojunction was prepared by solid-state method, and the as-prepared photocatalysts were applied to evaluate the photodegradation of tetracycline. The morphology of the as-synthesized samples was characterized by powder X-ray diffraction and Fourier transform infrared reflectance spectroscopy. The results of the photocatalytic degradation indicated that the photocatalytic performance of heterojunction is higher than that of parent compound g-C_(3)N_(4) and SrSb_(2)O_(6). Among them, the heterojunction named SSO-CN-2 exhibits the best performance and the photodegradation rate achieves 62% in 240 min, which is approximately 2.5 and 46.0 times higher than that of g-C_(3)N_(4) and SrSb_(2)O_(6), respectively. The behavior of photocatalytic degradation could well be described by a pseudo first order kinetic model, and the fitted rate constant was 3.920×10^(-3) min^(-1). Besides, the cycling experiments demonstrated that the photocatalytic performance of photocatalysts were repeatable and phase after photocatalysis was stable. Finally, the active free radical trapping experiments revealed that superoxide radical anion(·O^(-)_(2)) is the main active specie. The photocatalytic process could well be explained by mechanism of heterojunction Type-II.

关 键 词：二维异质结 光催化 可见光 四环素 

分 类 号：O643.36[理学—物理化学] O644.1[理学—化学] X703[环境科学与工程—环境工程]