Recently, Professor Wang Zhouping of Jiangnan University has made important progress in the development, application effect and mechanism of new all organic heterojunction photocatalyst of perylene diimide / g-c3n4n-heterojunction via π - π Interaction and interface charge separation "was published online on March 29, 2020 in applied catalyst B: environmental, a high-level journal, and is scheduled to be officially published on August 15, 2020 (appl. Catalyst. B: environment., 2020271118933, DOI: 10.1016/j.apcatb. 2020.118933). Gao qiuzhu, a master's degree candidate in the school of food science, is the first author of the paper. Dr. Xu Jing, Professor Wang Zhouping, a young teacher, and Professor Zhu Yongfa, Tsinghua University are co authors.
Heterojunction system construction is one of the effective ways to improve the semiconductor photocatalyst, while the all organic heterojunction photocatalyst has the characteristics of nonmetal, low cost, easy preparation, various functions, adjustable structure, etc., which has become the research hotspot in the field of photocatalysis in recent years, widely used in environmental purification, energy conversion and food safety. Professor Wang Zhouping's team members developed a new all organic heterojunction photocatalyst PDI / o-cn by in-situ electrostatic assembly method, which can show excellent performance in killing Staphylococcus aureus, degrading phenol and photolysis of aquatic oxygen under visible light (Figure 1). Compared with o-cn, PDI / o-cn heterojunction composite has stronger photocatalytic oxidation activity, the main reasons are as follows: (1) π - π interaction between o-cn and self-assembled PDI can cause electron delocalization effect, and promote photogenerated electrons to move along the direction of π - π stacking; (2) self-assembled PDI can broaden the visible light response range of o-cn and promote light energy to chemical energy In the process of photocatalytic reaction, PDI / o-cn heterojunction can produce more active species (H +, · O2 - and 1O2) with strong oxidation (Fig. 2). This study provides a new idea for the design of high activity g-c3n4 based photocatalyst, and expands the application prospect of organic semiconductor materials in the field of environmental purification and food safety.
The above research was supported by National Natural Science Foundation of China (21707052), Jiangsu agricultural science and technology independent innovation fund project (Cx (18) 2025), basic scientific research fund of Central University (jusrp11905, jusrp51714b) and key R & D Program project of Jiangsu Province (be2017623).
Applied catalyst B: environmental is Elsevier's flagship journal, which mainly publishes high-level research results in the fields of catalysis, environment and chemistry, and belongs to the top journal of the first district of Chinese Academy of Sciences.
Paper link: https://doi.org/10.1016/j.apcatb.2020.118933
Performance of PDI / o-cn heterojunction photocatalyst in killing Staphylococcus aureus (a), degrading phenol (b) and photolysis of aquatic oxygen (c) under visible light
Interfacial charge transfer process and π - π interaction of PDI / o-cn heterojunction photocatalyst
(source: School of food science, Jiangnan University)