Interface synthesis of Cu-BTC/PVDF hybrid membranes and their selective adsorption activity toward Congo red

Considering the surface affinity of MOFs and separation advantages of polymer membranes, herein, a one-step interface synthesis strategy is used in the construction of Cu-BTC/PVDF hybrid membranes, in which Cu 2+ ions and 1,3,5-benzenetricarboxylic acid (H 3 BTC) were dissolved in ionized water and...

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Published in:Dalton transactions : an international journal of inorganic chemistry 2023-08, Vol.52 (33), p.11441-1145
Main Authors: Hu, Defeng, Sun, Zhongqiao, Han, Yide, Meng, Hao, Zhang, Xia
Format: Article
Language:English
Subjects:
Adsorption
Chemical synthesis
Dyes
Fourier transforms
Hydrogen bonding
Infrared analysis
Infrared spectroscopy
Membranes
Octanol
Polyvinylidene fluorides
Selective adsorption
Self-assembly
Separation
Surface chemistry
Thermogravimetric analysis
Wastewater
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Summary:Considering the surface affinity of MOFs and separation advantages of polymer membranes, herein, a one-step interface synthesis strategy is used in the construction of Cu-BTC/PVDF hybrid membranes, in which Cu 2+ ions and 1,3,5-benzenetricarboxylic acid (H 3 BTC) were dissolved in ionized water and n -octanol separately, and polyvinylidene fluoride (PVDF) films were laid at the interface of two immiscible solvents. As a result, Cu-BTC was generated and readily self-assembled inside the PVDF films. Scanning electron microscopy (SEM), X-ray diffraction (XRD), Fourier transform infrared (FT-IR) spectroscopy, thermogravimetric analysis (TGA) and the Brunauer-Emmett-Teller (BET) method were used to characterize Cu-BTC/PVDF hybrid membranes, and Congo red (CR) was selected as the target dye to evaluate the surface adsorption activity of the hybrid membranes. Batch adsorption tests under various conditions were conducted to optimize the adsorption capacity, adsorption kinetics, isotherms and thermodynamics, which were analyzed to further explore the adsorption behavior. Based on this, the adsorption mechanism was discussed. It is worth noting that because of the π-π stacking interaction and hydrogen bonding, an extraordinary adsorption capacity of CR was achieved, and the good separation advantage and the cyclic adsorption performances endow the resulting Cu-BTC/PVDF hybrid membranes with promising applications in the removal of organic dyes from practical wastewater. An interface synthesis strategy is used to construct Cu-BTC/PVDF hybrid membranes with dense Cu-BTC inside the PVDF pores, which show extraordinary adsorption capacity toward Congo red.
ISSN:1477-9226
1477-9234
DOI:10.1039/d3dt02042h