Citation: Xue-Ying LU, Mei-Li ZHANG, Yi-Xia REN, Ji-Jiang WANG, Xiao-Gang YANG. Adsorption, photocatalytic degradation, and their mechanisms of methylene blue on three-dimensional Cu-MOF[J]. Chinese Journal of Inorganic Chemistry, ;2023, 39(10): 1991-2002. doi: 10.11862/CJIC.2023.158 shu

Adsorption, photocatalytic degradation, and their mechanisms of methylene blue on three-dimensional Cu-MOF

1.
Department of Chemistry and Chemical Engineering, Laboratory of New Energy & New Function Materials, Yan'an University, Yan'an, Shaanxi 716000, China
2.
College of Chemistry and Chemical Engineering, Luoyang Normal University, Henan Province Function-Oriented Porous Materials Key Laboratory, Luoyang, Henan 471934, China

Corresponding author: Mei-Li ZHANG, ydzml2332041@163.com Xiao-Gang YANG, yxg2233@126.com
Received Date: 17 March 2023
Revised Date: 2 September 2023

Figures(10)

Herein, we report the synthesis, structure, adsorption and photocatalytic degradation properties of a novel metal-organic framework [Cu₃(ppda)₃(tib)₂(H₂O)₄]·6H₂O (Cu-MOF) by the selection of the flexible 1,4-phenylenedi-acetic acid (H₂ppda) and the rigid 1,3,5-tris(1-imidazolyl) benzene (tib). In Cu-MOF, ppda^2- and tib ligands alternately link Cu ions to form 2D polymeric layers, the layer and layer interpenetrate each other by trans-ppda^2- to form a stable 3D structure. Cu-MOF has excellent thermal stability and semiconductor properties, so it can be used as a catalyst. Cu-MOF had the best catalytic effect on methylene blue (MB), with a catalytic efficiency of up to 97% and the highest reaction rate constant of 0.019 7 min^-1. The main photocatalytic degradation mechanism is the separation of the photogenerated electron and hole pair of the catalyst under the light excitation, and the redox reaction occurs to produce the active species to degrade the dye and eventually decompose into carbon dioxide and water. Cu - MOF exhibited high adsorption capacity after adding NaCl (200 g·L^-1) to MB solution (87.23 mg·g^-1). The adsorption process is a spontaneous monolayer chemisorption process illustrated by the pseudo-second-order kinetic and Langmuir isotherm models and thermodynamic studies.
- metal-organic framework,
- dye contaminant,
- photocatalytic activity,
- adsorption property
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