Copper mixed-triazolate frameworks featuring the thiophene-containing ligand towards enhanced photodegradation of organic contaminants in water

Si Shi; Penghu Guo; Muhammad Imran Anwar; Wendi Zhang; Wenhua Zhang; Guang Yang

doi:10.1016/j.jhazmat.2020.124757

Copper mixed-triazolate frameworks featuring the thiophene-containing ligand towards enhanced photodegradation of organic contaminants in water

J Hazard Mater. 2021 Mar 15:406:124757. doi: 10.1016/j.jhazmat.2020.124757. Epub 2020 Dec 9.

Authors

Si Shi¹, Penghu Guo², Muhammad Imran Anwar¹, Wendi Zhang¹, Wenhua Zhang³, Guang Yang⁴

Affiliations

¹ Green Catalysis Center and College of Chemistry, Zhengzhou University, 450001 Zhengzhou, Henan, PR China.
² College of Chemistry, Guangdong University of Petrochemical Technology, 525000 Maoming, Guangdong, PR China.
³ Green Catalysis Center and College of Chemistry, Zhengzhou University, 450001 Zhengzhou, Henan, PR China. Electronic address: whzhang@zzu.edu.cn.
⁴ Green Catalysis Center and College of Chemistry, Zhengzhou University, 450001 Zhengzhou, Henan, PR China. Electronic address: yang@zzu.edu.cn.

PMID: 33307447
DOI: 10.1016/j.jhazmat.2020.124757

Abstract

By using a thiophene-containing triazole ligand -3,5-di(thiophen-2-yl)-1H-1,2,4-triazole (3,5-Th₂-tzH) and 3,5-diphenyl-1H-1,2,4-triazole (3,5-Ph₂-tzH) in different molar ratio in the reactant, copper(I) mixed-triazolate frameworks CuMtz-1 {[Cu₈(3,5-Ph₂-tz)_6-x(3,5-Th₂-tz)_x](BF₄)₂(CH₃OH)₃} (x = 0.5 for CuMtz-1a and 1.1 for CuMtz-1b) were firstly synthesized and characterized by PXRD, IR, ¹H NMR, SEM, TG and UV-vis DRS. They have been evaluated as photocatalysts for the degradation of organic pollutants in water. It was found that the rate constants towards the degradation of both traditional and emerging organic contaminants over CuMtz-1b were significantly improved, i.e. by 160% for methyl orange, 210% for rhodamine B, 80% for methyl blue and 180% for sulfasalazine in comparison with that catalyzed over the parent MOF CuTz-1 {[Cu₈(3,5-Ph₂-tz)₆](BF₄)₂(CH₃OH)₃} under Xe lamp irradiation in the absence of H₂O₂. More importantly, the degradation efficiency of methyl orange and sulfasalazine by CuMtz-1b without the addition of H₂O₂ was quite comparable with that by CuTz-1 with the addition of H₂O₂ under both Xe lamp irradiation and natural sunlight. The enhancement on the degradation efficiency can be attributed to the increased light absorption ability and the change of the band structure caused by the incorporation of thiophene-containing triazole ligand.

Keywords: Dyes; Mixed-ligand metal-organic frameworks; Pharmaceuticals and personal care products; Photocatalysis.

Publication types

Research Support, Non-U.S. Gov't