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Chemosphere. 2019 Jan;214:743-753. doi: 10.1016/j.chemosphere.2018.09.091. Epub 2018 Sep 20.

Designing biochar properties through the blending of biomass feedstock with metals: Impact on oxyanions adsorption behavior.

Author information

1
Institute of Energy Engineering, Technische Universität Berlin, Chair for Energy Process Engineering and Conversion Technologies for Renewable Energies, Fasanenstr. 89, 10623, Berlin, Germany. Electronic address: alba.dieguezalonso@tu-berlin.de.
2
Institute of Thermal Engineering, Graz University of Technology, Inffeldgasse 25b, 8010, Graz, Austria.
3
Department of Chemistry, Trnava University, Trnava, SK-918 43, Slovak Republic.
4
Departamento de Química Agrícola y Bromatología, Facultad de Ciencias, Universidad Autónoma de Madrid, Madrid, Spain.
5
University of Natural Resources and Life Sciences, Vienna (BOKU University), Department of Chemistry, Division of Chemistry of Renewables, Konrad-Lorenz-Str. 24, 3430, Tulln, Austria.
6
Environmental Analytics, Agroscope, Reckenholzstr. 191, 8046, Zurich, Switzerland.
7
Dipartimento di Scienze Agrarie, Alimentari e Forestali, Università degli Studi di Palermo, Viale delle Scienze ed. 4, 90128, Palermo, Italy.
8
Department of Applied Ecology, Hochschule Geisenheim University, von-Lade Str. 1, 65366, Geisenheim, Germany.
9
CIRAD, UPR AIDA, TAB 115/02, Avenue Agropolis, F-34398, Montpellier, France; AIDA, University Montpellier, CIRAD, Montpellier, France.
10
BIOENERGY 2020+ GmbH, Inffeldgasse 21b, 8010, Graz, Austria.
11
Climate and Agriculture, Agroscope, Reckenholzstr. 191, 8046, Zurich, Switzerland.
12
AIT Austrian Institute of Technology GmbH, Environmental Resources & Technologies, Konrad-Lorenz-Str. 24, 3430, Tulln, Austria.
13
Ithaka Institute for Carbon Strategies, Ancienne Eglise 9, Arbaz, 1974, Switzerland.

Abstract

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.

KEYWORDS:

Adsorption; Designer biochar; Metal-blending; Oxyanion; Physico-chemical; Pore size distribution

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