Lead and cadmium sorption mechanisms on magnetically modified biochars

0466658 - ÚVGZ 2017 RIV GB eng J - Journal Article
Trakal, L. - Veselská, V. - Šafařík, Ivo - Vítková, M. - Číhalová, S. - Komárek, M.
Lead and cadmium sorption mechanisms on magnetically modified biochars.
Bioresource Technology. Roč. 203, MAR (2016), s. 318-324. ISSN 0960-8524. E-ISSN 1873-2976
R&D Projects: GA MŠMT(CZ) LD14066
Institutional support: RVO:67179843
Keywords : pyrolysis bio-chars * aqueous-solutions * heavy-metals * removal * adsorption * water * contaminants * pb * temperatures * copper * Magnetic biochar * Fe oxide impregnation * Metal sorption * Cation release * Wastewater treatment
Subject RIV: EI - Biotechnology ; Bionics
Impact factor: 5.651, year: 2016

This paper discusses Cd(II) and Pb(II) sorption efficiency of biochars modified by impregnation with magnetic particles. All selected biochar characteristics were significantly affected after the modification. More specifically, the cation exchange capacity increased after the modification, except for grape stalk biochar. However, the changes in the pH value, PZC, and BET surface after modification process were less pronounced. The metal loading rate was also significantly improved, especially for Cd(II) sorption on/in nut shield and plum stone biochars (10- and 16-times increase, respectively). The results indicated that cation exchange (as a metal sorption mechanism) was strengthened after Fe oxide impregnation, which limited the desorbed amount of tested metals. In contrast, the magnetization of grape stalk biochar reduced Pb(II) sorption in comparison with that of pristine biochar. Magnetic modification is, therefore, more efficient for biochars with well-developed structure and for more mobile metals, such as Cd(II). (C) 2015 Elsevier Ltd. All rights reserved.
Permanent Link: http://hdl.handle.net/11104/0264915