Preparation of new MOF-808/chitosan composite for Cr(VI) adsorption from aqueous solution: Experimental and DFT study

In this study, a series of Zirconium-based MOF and chitosan composites (MOF-808/chitosan) were synthesized as efficient adsorbent for Cr(VI) ions elimination from aqueous solution. MOF-808/chitosan structure and morphology was characterized by FE-SEM, EDX, XRD, BET, zeta potential analysis, FT-IR, X...

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Bibliographic Details
Published in:Carbohydrate polymers 2022-07, Vol.288, p.119383-119383, Article 119383
Main Authors: Valadi, Farshad Mirzaee, Shahsavari, Shayan, Akbarzadeh, Elham, Gholami, Mohammad Reza
Format: Article
Language:English
Subjects:
Adsorption
Chitosan
Chitosan - chemistry
Chromium - chemistry
Cr(VI)
DFT
Hydrogen-Ion Concentration
Kinetics
MOF-808
Spectroscopy, Fourier Transform Infrared
Thermodynamics
Water - chemistry
Water Pollutants, Chemical - chemistry
Water Purification
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Summary:In this study, a series of Zirconium-based MOF and chitosan composites (MOF-808/chitosan) were synthesized as efficient adsorbent for Cr(VI) ions elimination from aqueous solution. MOF-808/chitosan structure and morphology was characterized by FE-SEM, EDX, XRD, BET, zeta potential analysis, FT-IR, XPS techniques. The kinetic studies ascertained that Cr(VI) adsorption over MOF-808/chitosan followed pseudo-second-order kinetic model. The adsorption isotherms fitted the Langmuir isotherm model, implying on homogeneously adsorption of Cr(VI) on the surface of MOF-808/chitosan. According to the Langmuir model, the maximum capacity was obtained to be 320.0 mg/g at pH 5. Thermodynamic investigation proposed spontaneous (ΔG°  0) and endothermic (ΔH° > 0) for adsorption process. Besides, MOF-808/chitosan displayed an appropriate reusability for the elimination of Cr(VI) ions from their aqueous solutions for six successive cycles. DFT study of the adsorption process displayed and confirmed the role of hydrogen bonding and electrostatic attraction simultaneously. [Display omitted] •A series of Zirconium-based MOF and chitosan composites was synthesized.•MOF-808/chitosan indicated promising potential for Cr(VI) adsorption.•The maximum capacity was obtained to be 320.0 mg g−1 at pH = 5.•DFT was applied to study the possible interaction between adsorbent and Cr(VI).
ISSN:0144-8617
1879-1344
DOI:10.1016/j.carbpol.2022.119383