TY - JOUR
T1 - Designing biochar properties through the blending of biomass feedstock with metals
T2 - Impact on oxyanions adsorption behavior
AU - Dieguez-Alonso, Alba
AU - Anca-Couce, Andrés
AU - Frišták, Vladimír
AU - Moreno-Jiménez, Eduardo
AU - Bacher, Markus
AU - Bucheli, Thomas D.
AU - Cimò, Giulia
AU - Conte, Pellegrino
AU - Hagemann, Nikolas
AU - Haller, Andreas
AU - Hilber, Isabel
AU - Husson, Olivier
AU - Kammann, Claudia I.
AU - Kienzl, Norbert
AU - Leifeld, Jens
AU - Rosenau, Thomas
AU - Soja, Gerhard
AU - Schmidt, Hans Peter
N1 - Copyright © 2018 Elsevier Ltd. All rights reserved.
PY - 2019/1/1
Y1 - 2019/1/1
N2 - Metal-blending of biomass prior to pyrolysis is investigated in this work as a tool to modify biochar physico-chemical properties and its behavior as adsorbent. Six different compounds were used for metal-blending: AlCl3, Cu(OH)2, FeSO4, KCl, MgCl2 and Mg(OH)2. Pyrolysis experiments were performed at 400 and 700 °C and the characterization of biochar properties included: elemental composition, thermal stability, surface area and pore size distribution, Zeta potential, redox potential, chemical structure (with nuclear magnetic resonance) and adsorption behavior of arsenate, phosphate and nitrate. Metalblending strongly affected biochars’ surface charge and redox potential. Moreover, it increased biochars’ microporosity (per mass of organic carbon). For most biochars, mesoporosity was also increased. The adsorption behavior was enhanced for all metal-blended biochars, although with significant differences across species: Mg(OH)2-blended biochar produced at 400 °C showed the highest phosphate adsorption capacity (Langmuir Qmax approx. 250 mg g−1), while AlCl3-blended biochar produced also at 400 °C showed the highest arsenate adsorption (Langmuir Qmax approx. 14 mg g−1). Significant differences were present, even for the same biochar, with respect to the investigated oxyanions. This indicates that biochar properties need to be optimized for each application, but also that this optimization can be achieved with tools such as metal-blending. These results constitute a significant contribution towards the production of designer biochars.
AB - Metal-blending of biomass prior to pyrolysis is investigated in this work as a tool to modify biochar physico-chemical properties and its behavior as adsorbent. Six different compounds were used for metal-blending: AlCl3, Cu(OH)2, FeSO4, KCl, MgCl2 and Mg(OH)2. Pyrolysis experiments were performed at 400 and 700 °C and the characterization of biochar properties included: elemental composition, thermal stability, surface area and pore size distribution, Zeta potential, redox potential, chemical structure (with nuclear magnetic resonance) and adsorption behavior of arsenate, phosphate and nitrate. Metalblending strongly affected biochars’ surface charge and redox potential. Moreover, it increased biochars’ microporosity (per mass of organic carbon). For most biochars, mesoporosity was also increased. The adsorption behavior was enhanced for all metal-blended biochars, although with significant differences across species: Mg(OH)2-blended biochar produced at 400 °C showed the highest phosphate adsorption capacity (Langmuir Qmax approx. 250 mg g−1), while AlCl3-blended biochar produced also at 400 °C showed the highest arsenate adsorption (Langmuir Qmax approx. 14 mg g−1). Significant differences were present, even for the same biochar, with respect to the investigated oxyanions. This indicates that biochar properties need to be optimized for each application, but also that this optimization can be achieved with tools such as metal-blending. These results constitute a significant contribution towards the production of designer biochars.
KW - Adsorption
KW - Designer biochar
KW - Metal-blending
KW - Oxyanion
KW - Physico-chemical
KW - Pore size distribution
UR - http://www.scopus.com/inward/record.url?scp=85054311058&partnerID=8YFLogxK
U2 - 10.1016/j.chemosphere.2018.09.091
DO - 10.1016/j.chemosphere.2018.09.091
M3 - Article
C2 - 30293028
AN - SCOPUS:85054311058
SN - 0045-6535
VL - 214
SP - 743
EP - 753
JO - Chemosphere
JF - Chemosphere
ER -