Room temperature synthesis of copper-modified ZIF-8/Chitosan for enhanced adsorptive removal of congo red

•Copper-modified ZIF-8/Chitosan composites were successfully synthesized at room temperature.•Cu-doped ZIF-8/Chitosan showed a specific surface area of 522.776 m2/g, with the adsorption capacity toward congo red (CR) was 153.85 mg/g.•The adsorption process of all synthesized materials fitted well wi...

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Bibliographic Details
Published in:South African journal of chemical engineering 2024-07, Vol.49, p.86-98
Main Authors: Kulsum, Ummu, Fansuri, Hamzah, Santoso, Eko, Kurniawati, Lely, Hidayat, Alvin Romadhoni Putra, Zulfa, Liyana Labiba, Abdullah, Mustafa Al Bakri, Ediati, Ratna
Format: Article
Language:English
Subjects:
Adsorption
Chitosan
Congo red
Cu-doped
Zif-8
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Summary:•Copper-modified ZIF-8/Chitosan composites were successfully synthesized at room temperature.•Cu-doped ZIF-8/Chitosan showed a specific surface area of 522.776 m2/g, with the adsorption capacity toward congo red (CR) was 153.85 mg/g.•The adsorption process of all synthesized materials fitted well with the pseudo-second-order and langmuir model for its kinetic and isothermal adsorption, respectively.•The thermodynamic adsorption of CR on Cu-doped ZIF-8/Chitosan composite was an endothermic process and spontaneous. The synthesis of Cu(II)-doped ZIF-8/Chitosan by means of the one-pot method at room temperature was successfully carried out. The synthesized materials exhibit enhanced adsorption properties for the removal of Congo red (CR) dye. The structural and morphological properties of Cu(II)-doped ZIF-8/Chitosan were characterized. Cu(II)-doped ZIF-8/Chitosan achieved the most optimal CR removal efficiency and CR adsorption capacity (153.85 mg/g) due to its higher specific surface area (522.776 m2/g) compared to ZIF-8/Chitosan (514.882 m2/g). Electrostatic attraction, hydrogen bonding, and π-π interaction are the main interactions for the higher adsorption performance. The CR adsorption process followed pseudo-second-order kinetic model and Langmuir isotherm model. The results of the thermodynamic adsorption indicated that the process of CR adsorption by Cu-doped ZIF-8/Chitosan was an endothermic reaction. The experimental results indicate that the Cu(II)-doped ZIF-8/Chitosan material has the potential to be used in wastewater treatment for the removal of anionic dyes. [Display omitted]
ISSN:1026-9185
DOI:10.1016/j.sajce.2024.04.006