CuInS_(2)@3S-TiO_(2)复合材料的制备及光电催化降解左氧氟沙星的性能  

Preparation of CuInS_(2)@3S-TiO_(2) composites and performance study of photo-electric catalysis degradation of levofloxacin

作　　者：杨啸翰 李恩浩 舒喻宁 周旸 周元臻[1] 朱文磊 YANG Xiaohan;LI Enhao;SHU Yuning;ZHOU Yang;ZHOU Yuanzhen;ZHU Wenlei(School of Chemistry and Chemical Engineering,Xi'an University of Architecture and Technology,Xi'an,710055,China;State Key Laboratory of Pollution Control and Resourcefulness Research,School of Environment,Nanjing University,Nanjing,210023,China;Nanjing Foreign Language School,Nanjing,210008,China;Key Laboratory for Organic Electronics&Information Displays(KLOEID)and Institute of Advanced Materials(IAM),Nanjing University of Posts&Telecommunications(NJUPT),Nanjing,210046,China)

机构地区：[1]西安建筑科技大学化学与化工学院,西安710055 [2]南京大学环境学院,污染控制与资源化研究国家重点实验室,南京210023 [3]南京外国语学校,南京210008 [4]南京邮电大学,有机电子与信息显示重点实验室(KLOEID)和先进材料研究所(IAM),南京210046

出　　处：《环境化学》2023年第11期3666-3677,共12页Environmental Chemistry

摘　　要：近年来,研究与开发高效实用的新型污水处理技术,尤其是对难降解有毒有害污染物进行高效去除的技术,已成为环境领域的科学前沿和热点问题.光电催化技术作为一种新兴的高级氧化技术,具有反应条件温和、可利用太阳光、适用性广、无二次污染等优点,在污水处理领域具有广阔的应用前景.光电催化的核心在于催化剂的设计,而中空多级材料是一种在光催化领域极具前景的特殊结构.本文通过采用次序模板法合成了不同层数的中空多壳层二氧化钛,并利用水热法修饰并制备了不同比例的CuInS_(2)@3S-TiO_(2)的Z型异质结构复合催化剂.通过构建光阳极主导的光电催化系统降解左氧氟沙星(LEV),并对系列降解参数进行了优化,同时探究了系统的降解机理.通过XPS、Mott-Schottky等测试,验证了电子的转移路径,并证实CuInS_(2)@3S-TiO_(2)所组成的异质结构可以扩展光吸收范围、提升光电流密度、促进光生电子和空穴的分离.此外,光电极在实际使用中也表现出良好的循环稳定性.通过猝灭实验证明了其活性物质种类及其优势活性物种,并通过一系列对照实验证实了结构所带来的优势以及系统设计的合理性.通过以上实验证实结构工程与异质结的组合设计实现了对降解效率与矿化效率的调控,并对空间界面上实现级联可能存在的催化机制进行了探讨.结果显示,CuInS_(2)(5%)@3S-TiO_(2)在7.5 mA·cm^(-2)、未调整pH(5.5)和25℃的优化条件下,该系统对LEV的降解效率在40 min内可达到93.7%.Research and development of efficient and practical new wastewater treatment technologies,particularly for the efficient removal of persistent toxic and hazardous pollutants,has become a cutting-edge and high-priority issue in the field of environmental science.Photocatalysis,as an emerging advanced oxidation technology,offers advantages such as mild reaction conditions,utilization of solar energy,wide applicability,and absence of secondary pollution,making it highly promising for wastewater treatment applications.The key to photocatalysis lies in catalyst design,and hollow multistage materials represent a special structure with great potential in the field of photocatalysis.In this study,hollow multishell layers of titanium dioxide with varying numbers of layers were synthesized using a sequential template method,and Z-scheme heterostructured composite catalysts with different CuInS_(2)@3S-TiO_(2) ratios were modified and prepared using a hydrothermal method.A photocatalytic system dominated by the photoanode was constructed for the degradation of levofloxacin(LEV),and a series of degradation parameters were optimized to investigate the degradation mechanism of the system.Experimental results confirmed the pathways of electron transfer through XPS,Mott-Schottky,and other tests.It was also confirmed that the heterostructure composed of CuInS_(2)@3S-TiO_(2) extended the light absorption range,enhanced the photocurrent density,and promoted the separation of photogenerated electrons and holes.The photovoltaic electrodes also demonstrated good cycling stability during practical use.Quenching experiments confirmed the active substance species and dominant active species.Control experiments further confirmed the advantages of the structure and the rationality of the system design.The combination of structural engineering and heterojunction design in this study achieved regulation of both degradation efficiency and mineralization efficiency.Additionally,the possible catalytic mechanisms for achieving cascade reactions a

关 键 词：光电催化 空心多级结构 抗生素废水 高级氧化技术 

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]