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Article

Fly Ash Coated with Magnetic Materials: Improved Adsorbent for Cu (II) Removal from Wastewater

1
Chemical Engineering Department, Faculty of Chemical Engineering and Environmental Protection, “Gheorghe Asachi” Technical University of Iasi, 73 Prof.dr.doc. Dimitrie Mangeron Street, 700050 Iasi, Romania
2
National Institute of Research and Development for Technical Physics, 47 Mangeron Boulevard, 700050 Iasi, Romania
*
Authors to whom correspondence should be addressed.
Materials 2021, 14(1), 63; https://doi.org/10.3390/ma14010063
Received: 26 November 2020 / Revised: 17 December 2020 / Accepted: 21 December 2020 / Published: 25 December 2020
(This article belongs to the Special Issue Smart Materials in Environmental Science)
Fly ash/magnetite material was used for the adsorption of copper ions from synthetic wastewater. The obtained material was characterized by scanning electron microscopy (SEM), energy dispersive X-ray analysis (EDAX), X-ray diffractometer (XRD), Fourier transform infrared spectroscopy (FTIR), Brunauer–Emmett–Teller (BET) surface area, and vibrating sample magnetometer (VSM). Batch adsorption experiments were employed in order to investigate the effects of adsorbent dose, initial Cu (II) concentration and contact time over adsorption efficiency. The experimental isotherms were modeled using Langmuir (four types of its linearization), Freundlich, Temkin, and Harkins–Jura isotherm models. The fits of the results are estimated according to the Langmuir isotherm, with a maximum adsorption capacity of 17.39 mg/g. The pseudo-second-order model was able to describe kinetic results. The data obtained throughout the study prove that this novel material represents a potential low-cost adsorbent for copper adsorption with improved adsorption capacity and magnetic separation capability compared with raw fly ash. View Full-Text
Keywords: copper ions adsorption; Fe3O4; fly ash; isotherms; kinetic models; wastewater copper ions adsorption; Fe3O4; fly ash; isotherms; kinetic models; wastewater
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MDPI and ACS Style

Harja, M.; Buema, G.; Lupu, N.; Chiriac, H.; Herea, D.D.; Ciobanu, G. Fly Ash Coated with Magnetic Materials: Improved Adsorbent for Cu (II) Removal from Wastewater. Materials 2021, 14, 63. https://doi.org/10.3390/ma14010063

AMA Style

Harja M, Buema G, Lupu N, Chiriac H, Herea DD, Ciobanu G. Fly Ash Coated with Magnetic Materials: Improved Adsorbent for Cu (II) Removal from Wastewater. Materials. 2021; 14(1):63. https://doi.org/10.3390/ma14010063

Chicago/Turabian Style

Harja, Maria, Gabriela Buema, Nicoleta Lupu, Horia Chiriac, Dumitru Daniel Herea, and Gabriela Ciobanu. 2021. "Fly Ash Coated with Magnetic Materials: Improved Adsorbent for Cu (II) Removal from Wastewater" Materials 14, no. 1: 63. https://doi.org/10.3390/ma14010063

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