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DOI: https://doi.org/10.4491/eer.2021.512
Effective sequestration of levofloxacin from wastewater by biochar-supported manganese dioxide composite: Experimental study and modelling analyses
Abel Adekanmi Adeyi1,2, Nathan Kura Bitrus1, Luqman Chuah Abdullah2, Lekan Taofeek Popoola1, Maureen Chijioke-Okere3, Oluwagbenga Olawale Omotara1, and Shihab Ezzuldin M.Saber2,4
1Department of Chemical and Petroleum Engineering, College of Engineering, Afe Babalola University Ado-Ekiti, ABUAD, KM. 8.5, Afe Babalola Way, Ado-Ekiti, Ekiti State, Nigeria
2Department of Chemical and Environmental Engineering, Faculty of Engineering, Universiti Putra Malaysia, UPM Serdang 43400, Malaysia
3Department of Chemistry, School of Physical Science, Federal University of Technology Owerri (FUTO), PMB 1526 Owerri, Nigeria
4North Refineries Company, Ministry of Oil, Iraq
Corresponding Author: Abel Adekanmi Adeyi ,Tel: +2348060921556 , Email: abeladeyi@abuad.edu.ng
Received: October 11, 2021;  Accepted: December 1, 2021.
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ABSTRACT
Manganese dioxide was laden hooked on biochar sourced from chicken feather to obtain a biochar-supported manganese dioxide (BSM) composite. In order to reduce the costs of acquisition and minimise the disposal of adsorbents, prepared BSM composite were employed in the sequestration of Levofloxacin (LEVO) from aqueous environment. The physico-chemical features and the adsorption mechanisms of prepared BSM, prior and after the adsorption of LEVO molecules were revealed by Scanning Electron Microscopy and Fourier Transform Infrared spectroscopy techniques. The influence of adsorption parameters including BSM dose, initial concentration, temperature and residence time were studied. The removal of LEVO was significantly influenced by all parameters. Equilibrium data has its fitness in the following order: Redlich-Peterson ˃ Langmuir ˃ Freundlich models. The maximum adsorption capacity of BSM for LEVO was 104.13 mg/g. The kinetic analysis indicates best fittings for pseudo-second-order model suggesting chemisorption as controlled mechanism. Besides, liquid film and intra-particle diffusion had a vital influence on the LEVO sequestration process. Exothermic and spontaneous nature of LEVO uptake by BSM was revealed by thermodynamic analysis. The findings suggested that prepared BSM show high sorption capacity, and recyclability potential towards separation of LEVO from contaminated pharmaceutical wastewater.
Keywords: Biochar | Chicken feather | Composite | Mechanisms | Levofloxacin | Sequestration
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