Microwave assisted synthesis of PQ-GDY@NH2-UIO-66(Zr) for improved photocatalytic removal of NOx under visible light

Qingyu Yang; Shuangjun Li; Rui Liang; Lei Gao; Shao Zhang; Junfen Jia; Yiran Liu; Rundong Lyv; Guisheng Li; Shengxiong Xiao; Dieqing Zhang

doi:10.1016/j.jes.2023.01.020

Microwave assisted synthesis of PQ-GDY@NH₂-UIO-66(Zr) for improved photocatalytic removal of NO_x under visible light

J Environ Sci (China). 2023 Dec:134:126-137. doi: 10.1016/j.jes.2023.01.020. Epub 2023 Feb 8.

Authors

Affiliations

¹ The Education Ministry Key Lab of Resource Chemistry, Joint International Research Laboratory of Resource Chemistry of Ministry of Education, Shanghai Key Laboratory of Rare Earth Functional Materials, and Shanghai Frontiers Science Center of Biomimetic Catalysis, Shanghai Normal University, Shanghai 200234, China.
² The Education Ministry Key Lab of Resource Chemistry, Joint International Research Laboratory of Resource Chemistry of Ministry of Education, Shanghai Key Laboratory of Rare Earth Functional Materials, and Shanghai Frontiers Science Center of Biomimetic Catalysis, Shanghai Normal University, Shanghai 200234, China. Electronic address: xiaosx@shnu.edu.cn.
³ The Education Ministry Key Lab of Resource Chemistry, Joint International Research Laboratory of Resource Chemistry of Ministry of Education, Shanghai Key Laboratory of Rare Earth Functional Materials, and Shanghai Frontiers Science Center of Biomimetic Catalysis, Shanghai Normal University, Shanghai 200234, China. Electronic address: dqzhang@shnu.edu.cn.

PMID: 37673528
DOI: 10.1016/j.jes.2023.01.020

Abstract

Pyrazinoquinoxaline-based graphdiyne (PQ-GDY) contains a fixed number of sp-sp² hybridized carbon atoms and pyrazine-like sp² hybridized N atoms. In this paper, NH₂-UIO-66(Zr) on PQ-GDY substrate was successfully constructed with the help of microwave-assisted heating. PQ-GDY surface acts as a microwave antenna under microwave irradiation to rapidly absorb microwave energy and form hot spots (hot spot effect), which facilitates the formation of well-dispersed NH₂-UIO-66(Zr) with good crystallinity. Transient absorption spectra show that high hole transport property of PQ-GDY can accelerate the migration of photogenerated holes from NH₂-UIO-66(Zr) to PQ-GDY and greatly reduce the recombination rate of photogenerated electrons and holes due to the strong interaction between PQ-GDY and NH₂-UIO-66(Zr). Under visible light (λ ≥ 420 nm), PQ-GDY@NH₂-UIO-66(Zr) shows high photocatalytic stability and high NO_x removal rate up to 74%, which is 44% higher than that of primitive NH₂-UIO-66(Zr). At the same time, it inhibits the formation of toxic by-products (NO₂) and limits its concentration to a low level.

Keywords: Graphite acetylene; Metal-organic backbone; Nitrogen oxides; Photocatalysis.

MeSH terms

Carbon
Light
Microwaves*
Phthalic Acids*

Substances

UiO-66
Phthalic Acids
Carbon