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Multifunctional polysaccharide structure as green adsorbent for efficient removal and preconcentration of chlorophenols from the aqueous medium: experimental and modeling approaches

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Abstract

The growing concerns about water pollution have prompted researchers to explore new materials for remediating and purifying it. In recent years, there has been a focus on polysaccharides as eco-friendly polymers that exhibit high efficiency in removing chlorophenols from waste water. This study aims to develop a trifunctional polysaccharide structure using a biodegradable matrix. The chitosan/alginate-polyethyleneimine-phenyl-phosphonamidic acid (CHIT/ALG-PEIPPAA) matrix was employed for removing chlorophenols from water. The study carefully examined the impact of various physicochemical parameters such as pH, reaction time, chlorophenols concentration, temperature, and ionic strength to determine the optimal conditions for the adsorption process. Several techniques were used to confirm the morphology, physicochemical properties, structure, and functionalization of the polymer. Scanning electron microscopy (SEM) images revealed a heterogeneous morphology with agglomerates of different particle sizes, ranging from a few micrometers with irregular shapes. The FTIR spectrum and zeta potential characterization indicated the presence of hydrophilic groups and a highly positive charge (around 31.4 mV) on the surface of the CHIT/ALG-PEIPPAA adsorbent. The optimal pH for chlorophenols removal was found to be approximately 4.4. The kinetic data supported the pseudo-second-order kinetic model, which accurately described the adsorption behavior of both chlorophenol molecules. The fitting of the isotherm analysis revealed that the Langmuir model provided a better representation of the adsorption process. The maximum adsorption capacities for 4-chlorophenol and 2,4-chlorophenol were approximately 118 mg.g−1 and 249 mg.g−1, respectively. The calculated thermodynamic functions confirmed an exothermic and spontaneous adsorption process for chlorophenols, with ∆H values of -6.98 kJ.mol−1 and −2.74 kJ.mol−1 for 4-chlorophenol and 2,4-chlorophenol, respectively. The regeneration process of the CHIT/ALG-PEIPPAA adsorbent showed higher efficacy in the presence of hydrochloric acid (2.0 mol.L−1), resulting in up to 91% desorption of chlorophenols. The CHIT/ALG-PEIPPAA adsorbent demonstrated good reusability after regeneration, with only a slight decrease in extraction efficiency: 34.63% for 4-chlorophenol and 79.03% for 2,4-chlorophenol, under the same optimal conditions as the initial adsorption cycle.

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Acknowledgements

This research was supported and funded by University Center Salhi Ahmed Naama (Algeria), Laboratory of Inorganic Chemistry and Environment, Department of Chemistry (Tlemcen University), and other laboratories implicated in the above Universities.

Funding

This work was funded by University Center Salhi Ahmed Naama (Algeria). The funder had no role in study design, experimentation and analysis, decision to publish, or the preparation of the paper.

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Nacer FERRAH: conceptualization, project administration, writing—original draft. Djamila Merghache: methodology, formal analysis, data curation. Mustapha Chabane: writing review and editing, investigation. Abdessamed Derdour: software, validation. Riad Mansour: resources, investigation. Tayeb Nouri: resources, validation. Sid Ahmed Cheikh: methodology, experimentation. El Housseyn Zerriahen: methodology, resources. All authors contributed equally to this work, and they read and approved the final manuscript.

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Correspondence to Nacer Ferrah.

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The study is exempt from review by any Ethics Committee, and this type of research is non-human subject study, and waived the need for informed consent. Also, this paper does not report on or involve the use of any animal or human data or tissue

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Ferrah, N., Merghache, D., Chabane, M. et al. Multifunctional polysaccharide structure as green adsorbent for efficient removal and preconcentration of chlorophenols from the aqueous medium: experimental and modeling approaches. Environ Sci Pollut Res 30, 93531–93545 (2023). https://doi.org/10.1007/s11356-023-28947-2

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  • DOI: https://doi.org/10.1007/s11356-023-28947-2

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