Valuation of banana peels as an effective biosorbent for mercury removal under low environmental concentrations
authors Fabre, E; Lopes, CB; Vale, C; Pereira, E; Silva, CM
nationality International
journal SCIENCE OF THE TOTAL ENVIRONMENT
author keywords Biosorbent; Mercury removal; Sorption; Water treatment
keywords HEXAVALENT CHROMIUM BIOSORPTION; AQUEOUS-SOLUTIONS; TOXIC METALS; ADSORPTION; KINETICS; SORPTION; WASTE; EQUILIBRIUM; ORDER; IONS
abstract The use of banana peels as biosorbent for mercury sorption fromdifferent aqueous solutions was investigated in this work. The impact of the operating conditions, such as biosorbent dosage, contact time and ionic strength was evaluated for realistic initial Hg(II) concentrations of 50 mu g dm(-3). Biosorbent dosage and contact time showed more influence on Hg(II) removal than ionic strength, and their increase led to improve Hg(II) uptake achieving final concentrations with drinking water quality. The kinetic behaviour of the sorption process was assessed through the reaction-based models of pseudo-first order, pseudo-second order and Elovich, being the last two more appropriated to describe the process. The equilibrium study showed that Freundlich isotherm provided the best fit to the experimental results (R-2 = 0.991), which may suggest a multilayer mechanism at biosorbent surface, and the sorption capacity of banana peels obtained from Langmuir isotherm was 0.75 mg g(-1). The ability of banana peels to sorb Hg(II) was also examined under real waters, like seawater and a wastewater, which confirmed the feasibility of the biosorbent. Additionally, a counter-current two-stages unit has been proposed for the application of banana peels as biosorbent in water treatments for mercury removal. (C) 2019 Elsevier B.V. All rights reserved.
publisher ELSEVIER
issn 0048-9697
year published 2020
volume 709
digital object identifier (doi) 10.1016/j.scitotenv.2019.135883
web of science category Environmental Sciences
subject category Environmental Sciences & Ecology
unique article identifier WOS:000512281700025
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journal analysis (jcr 2019):
journal impact factor 6.551
5 year journal impact factor 6.419
category normalized journal impact factor percentile 91.887
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