Zinc oxide decorated plantain peel activated carbon for adsorption of cationic malachite green dye: Mechanistic, kinetics and thermodynamics modeling

Reports have shown that malachite green (MG) dye causes various hormonal disruptions and health hazards, hence, its removal from water has become a top priority. In this work, zinc oxide decorated plantain peels activated carbon (ZnO@PPAC) was developed via a hydrothermal approach. Physicochemical c...

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Published in:	Environmental research Vol. 252; p. 119046
Main Authors:	Dada, Adewumi Oluwasogo, Inyinbor, Abosede Adejumoke, Tokula, Blessing Enyojo, Bayode, Abiodun Ajibola, Obayomi, Kehinde Shola, Ajanaku, Christiana Oluwatoyin, Adekola, Folahan Amoo, Ajanaku, Kolawole Oluseyi, Pal, Ujjwal
Format:	Journal Article
Language:	English
Published:	Netherlands Elsevier Inc 01-07-2024
Subjects:	Endocrine disrupting chemicals Isotherm Kinetics and thermodynamics Malachite green ZnO-Doped-PPAC nanocomposites Kinetics and thermodynamics Isotherm ZnO-Doped-PPAC nanocomposites Malachite green Endocrine disrupting chemicals Malachite Green Kinetics and Thermodynamics ZnO-doped-PPAC Nanocomposites
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Summary:	Reports have shown that malachite green (MG) dye causes various hormonal disruptions and health hazards, hence, its removal from water has become a top priority. In this work, zinc oxide decorated plantain peels activated carbon (ZnO@PPAC) was developed via a hydrothermal approach. Physicochemical characterization of the ZnO@PPAC nanocomposite with a 205.2 m2/g surface area, porosity of 614.68 and dominance of acidic sites from Boehm study established the potency of ZnO@PPAC. Spectroscopic characterization of ZnO@PPAC vis-a-viz thermal gravimetric analyses (TGA), Fourier Transform Infrared Spectroscopy (FTIR), Powdered X-ray Diffraction (PXRD), Scanning Electron Microscopy and High Resolution – Transmission Electron Microscopy (HR-TEM) depict the thermal stability via phase transition, functional group, crystallinity with interspatial spacing, morphology and spherical and nano-rod-like shape of the ZnO@PPAC heterostructure with electron mapping respectively. Adsorption of malachite green dye onto ZnO@PPAC nanocomposite was influenced by different operational parameters. Equilibrium data across the three temperatures (303, 313, and 323 K) were most favorably described by Freundlich indicating the ZnO@PPAC heterogeneous nature. 77.517 mg/g monolayer capacity of ZnO@PPAC was superior to other adsorbents compared. Pore-diffusion predominated in the mechanism and kinetic data best fit the pseudo-second-order. Thermodynamics studies showed the feasible, endothermic, and spontaneous nature of the sequestration. The ZnO@PPAC was therefore shown to be a sustainable and efficient material for MG dye uptake and hereby endorsed for the treatment of industrial effluent. [Display omitted] •Zinc oxide decorated plantain peels activated carbon (ZnO@PPAC) was developed via a hydrothermal technique.•Physicochemical characterization of the ZnO@PPAC nanocomposite enhanced excellent adsorption performance.•Characterization by SEM, DSC, DTG, TGA, FTIR, TEM, and HR-TEM confirmed the development of decorated ZnO@PPAC.•Effective adsorption of Malachite green onto ZnO@PPAC demonstrated a dependence on operational parameters.•Freundlich isotherm, Pseudo second-order and pore diffusion mechanism governed the thermodynamically feasible adsorption system.
Bibliography:	ObjectType-Article-1 SourceType-Scholarly Journals-1 ObjectType-Feature-2 content type line 23
ISSN:	0013-9351 1096-0953
DOI:	10.1016/j.envres.2024.119046