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Physicochemical Characterization of Cherry Pits-Derived Biochar

Department of Chemistry, Trnava University in Trnava, 91843 Trnava, Slovakia
Institute of Materials Science, Faculty of Materials Science and Technology in Trnava, Slovak University of Technology in Bratislava, 91724 Trnava, Slovakia
Institute of Environmental Science and Technology (ICTA-UAB), Universitat Autónoma de Barcelona, 08193 Barcelona, Spain
Energy Department, Austrian Institute of Technology GmbH, 3430 Tulln, Austria
Institute for Chemical and Energy Engineering, University of Natural Resources and Life Sciences Vienna, 1190 Vienna, Austria
Author to whom correspondence should be addressed.
Academic Editors: Magdalena Balintova and Adriana Estokova
Materials 2022, 15(2), 408;
Received: 22 November 2021 / Revised: 29 December 2021 / Accepted: 4 January 2022 / Published: 6 January 2022
(This article belongs to the Special Issue Materials for Heavy Metals Removal from Waters)
Although the suitability of some biochars for contaminants’ sorption separation has been established, not all potential feedstocks have been explored and characterized. Here, we physicochemically characterized cherry pit biochar (CPB) pyrolyzed from cherry pit biomass (CP) at 500 °C, and we assessed their As and Hg sorption efficiencies in aqueous solutions in comparison to activated carbon (AC). The basic physicochemical and material characterization of the studied adsorbents was carried out using pH, electrical conductivity (EC), cation exchange capacity (CEC), concentration of surface functional groups (Boehm titration), and surface area (SA) analysis; elemental C, H, N analysis; and Fourier-transform infrared spectroscopy (FTIR) and scanning electron microscopy with energy-dispersive X-ray spectroscopy (SEM–EDX). AsO43− anions and Hg2+ cations were selected as model contaminants used to test the sorption properties of the sorption materials. Characterization analyses confirmed a ninefold increase in SA in the case of CPB. The total C concentration increased by 26%, while decreases in the total H and N concentrations were observed. The values of carbonate and ash contents decreased by about half due to pyrolysis processes. The concentrations of surface functional groups of the analyzed biochar obtained by Boehm titration confirmed a decrease in carboxyl and lactone groups, while an increase in phenolic functional groups was observed. Changes in the morphology and surface functionality of the pyrolyzed material were confirmed by SEM–EDX and FTIR analyses. In sorption experiments, we found that the CPB showed better results in the sorption separation of Hg2+ than in the sorption separation of AsO43−. The sorption efficiency for the model cation increased in the order CP < CPB < AC and, for the model anion, it increased in the order CPB < CP < AC. View Full-Text
Keywords: biochar; pyrolysis; sorption separation; Hg; As biochar; pyrolysis; sorption separation; Hg; As
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MDPI and ACS Style

Frišták, V.; Bošanská, D.; Pipíška, M.; Ďuriška, L.; Bell, S.M.; Soja, G. Physicochemical Characterization of Cherry Pits-Derived Biochar. Materials 2022, 15, 408.

AMA Style

Frišták V, Bošanská D, Pipíška M, Ďuriška L, Bell SM, Soja G. Physicochemical Characterization of Cherry Pits-Derived Biochar. Materials. 2022; 15(2):408.

Chicago/Turabian Style

Frišták, Vladimír, Diana Bošanská, Martin Pipíška, Libor Ďuriška, Stephen M. Bell, and Gerhard Soja. 2022. "Physicochemical Characterization of Cherry Pits-Derived Biochar" Materials 15, no. 2: 408.

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