论文封面

近日，广东工业大学环境健康与污染控制研究院、环境科学与工程学院安太成教授团队和生物医药学院王文霞博士在新型双Z型光催化降解药物污染物方面取得新的研究进展，研究成果以《Novel Ag-bridged dual Z-scheme g-C₃N₄/BiOI/AgI plasmonic heterojunction: Exceptional photocatalytic activity towards tetracycline and the mechanism insight》为题发表在Journal of Environmental Sciences (2023, 131, 123-140; https://doi.org/10.1016/j.jes.2022.11.002) 期刊上。论文的第一作者为王文霞博士，通讯作者为安太成教授。本研究报道了一种新型纳米Ag介导的3D多孔双Z型异质结g-C₃N₄/BiOI/AgI光催化剂，催化剂的独特结构具有以下优势：i）3D多孔结构光催化剂具有较高的比表面积，可提供大量的活性位点，加速表面反应；ii）通过内部三维分级结构多次反射和折射提高可见光利用率；iii）Ag纳米颗粒的局部表面等离激元共振可增强电荷转移，提高光生电子寿命；iv）双Z-型异质结加速电子-空穴分离效率，提高光催化效率。由于形貌调控、助催化剂掺杂和双Z型异质结的协同作用，该催化剂在可见光条件下能够实现对四环素的超快速降解。在最优条件下，制备的3D多孔双Z型异质结g-C₃N₄/BiOI/Ag-AgI光催化剂在165 min内对四环素的去除率高达91.8%。光电化学性能表征验证了复合材料中电子-空穴的分离增强和电荷转移性能。该研究为设计多元改性复合光催化剂高效降解水体中药物污染物提供新的见解。

论文的网址: https://doi.org/10.1016/j.jes.2022.11.002

图文摘要

英文摘要：

Rational design and synthesis of highly efficiently and robust photocatalysts with positive exciton splitting and interfacial charge transfer for environmental application is critical. Herein, aiming at overcoming the common shortcomings of the traditional photocatalyst as examples by the weak photoresponsivity, rapid combination of photo-generated carriers and unstable structure, a novel Ag-bridged Z-scheme 3D/3D g-C₃N₄/BiOI plasmonic heterojunction was successfully synthesized via a facile method associated with self-assembly and photoreduction. Results indicated that the Ag nanoparticles and 3D BiOI microspheres decorated highly uniformly on the 3D porous g-C₃N₄ nanosheet, resulting in larger specific surface area and abundant reactive active sites. The optimized 3D porous Z-scheme g-C₃N₄/BiOI/Ag manifested exceptional photocatalytic degradation efficiency of tetracycline (TC) in water, with approximately 91.8% degradation efficiency within 165 min, outperforming majority of the reported g-C₃N₄-based photocatalysts, and it also exhibited good stability in terms of activity and structure. In-depth radical scavenging and EPR analysis confirmed the relative contribution of the scavengers. Mechanism analysis indicate that the improved photocatalytic performance and stability was ascribed to the highly ordered 3D porous framework, fast electron transfer of Z-scheme heterojunction, desirable photocatalytic performance of BiOI and synergistic effect of Ag plasmas. Therefore, the 3D porous Z-scheme g-C₃N₄/BiOI/Ag heterojunction had a good prospect for application in water remediation. We believe that our work would provide new insight and useful guidance for designing novel structural photocatalyst for environmental-related applications.

项目资助：本研究得到国家自然科学基金(22106020, 42122056)、广东省珠江人才计划本土创新团队项目(2017BT01Z032)、广东省重点领域研发计划(2020B1111350002)和广东省基础与应用基础研究基金(2020A1515110718)的资助。