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Carvalho Costa AWM, Guerhardt F, Ribeiro Júnior SER, Cânovas G, Vanale RM, de Freitas Coelho D, Ehrhardt DD, Rosa JM, BasileTambourgi E, Curvelo Santana JC, de Souza RR. Biosorption of Cr(VI) using coconut fibers from agro-industrial waste magnetized using magnetite nanoparticles. Environ Technol 2021; 42:3595-3606. [PMID: 32266861 DOI: 10.1080/09593330.2020.1752812] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/03/2019] [Accepted: 02/20/2020] [Indexed: 06/11/2023]
Abstract
Herein, the biosorption of Cr(VI) by magnetized coconut fibres obtained from agricultural waste has been described. Magnetization was achieved by incorporating magnetite nanoparticles into the fibres by a coprecipitation reaction in alkaline media. The biosorption capacity of the fibres was evaluated by two series of experiments. In the first series, 500 mg L-1 of the biosorbent was added to a 50 mg L-1 K2Cr2O7 solution at 28 °C and stirred at 200 rpm and the pH was varied from 1 to 13 to determine the optimum pH value. The second series of experiments evaluated the sorption capacity of the fibres at the optimum pH, under the same agitation speed and temperature but with an adsorbate concentration of 100 mg L-1. The biosorbents were characterized using Fourier transform-infrared spectroscopy, inductively coupled plasma-atomic emission spectroscopy, scanning electron microscopy, dispersive X-ray fluorescence, and X-ray powder diffraction. The biosorption experiments demonstrated that the magnetization process increased the biosorption capacity of the material. Optimum biosorption occurred at pH 2, and at optimal conditions, the best adsorptive efficiency exceeded 90%, reaching a biosorption capacity of 87.38 mg g-1 for the magnetized fibre and 23.87 mg g-1 for the natural fibre, with an equilibrium time of less than 20 min.
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Affiliation(s)
- Antonio Wilson Macedo Carvalho Costa
- Department of Chemistry, Federal Institute de Education, Science and Technology of Sergipe (IFS), Aracaju, Brazil
- Department of Chemical Engineering, Federal University of Sergipe (UFS), São Cristóvão, Brazil
| | - Flavio Guerhardt
- Nine July University, Industrial Engineering Postgraduate Program, São Paulo, Brazil
- Technologic Park of Sorocaba, Sorocaba, Brazil
| | | | | | | | | | - Daniela Diniz Ehrhardt
- School of Chemical Engineering, State University of Campinas (UNICAMP), Campinas, Brazil
| | - Jorge Marcos Rosa
- School of Chemical Engineering, State University of Campinas (UNICAMP), Campinas, Brazil
- University of São Paulo, Butantã, São Paulo, Brazil
| | - Elias BasileTambourgi
- School of Chemical Engineering, State University of Campinas (UNICAMP), Campinas, Brazil
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