University of Oulu

Lang, J., Matějová, L., Cuentas-Gallegos, A. K., Lobato-Peralta, D. R., Ainassaari, K., Gómez, M. M., Solís, J. L., Mondal, D., Keiski, R. L., & Cruz, G. J. F. (2021). Evaluation and selection of biochars and hydrochars derived from agricultural wastes for the use as adsorbent and energy storage materials. Journal of Environmental Chemical Engineering, 9(5), 105979.

Evaluation and selection of biochars and hydrochars derived from agricultural wastes for the use as adsorbent and energy storage materials

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Author: Lang, J.1; Matějová, L.1; Cuentas-Gallegos, A.K.2;
Organizations: 1Energy and Environmental Technology Centre, VSB - Technical University of Ostrava, 17. Listopadu 2172/15, 708 00 Ostrava-Poruba, Czech Republic
2Instituto de Energías Renovables, Universidad Nacional Autónoma de México, Priv. Xochicalco s/n, Col. Centro, Temixco, Morelos CP 62580, Mexico
3Environmental and Chemical Engineering, University of Oulu, P.O.Box 4300, FI-90014 Oulu, Finland
4Facultad de Ciencias, Universidad Nacional de Ingeniería, Av. Túpac Amaru 210, Lima 25, Peru
5Institute of Medical and Biomedical Education St George’s, University of London, SW17 0RE, United Kingdom
6Departamento de Ingeniería Forestal y Gestión Ambiental, Facultad de Ciencias Agrarias, Universidad Nacional de Tumbes, Ciudad Universitario s/n Pampa Grande, Tumbes, Peru
Format: article
Version: accepted version
Access: embargoed
Persistent link:
Language: English
Published: Elsevier, 2021
Publish Date: 2023-07-03


The utilization of unconventional agricultural wastes to obtain new porous carbonaceous materials, at mild pyrolysis temperatures and without complex procedures, for either water treatment and energy storage applications is important from the economic and environmental perspective. In this study, biochars and hydrochars were prepared from banana rachis, cocoa pod husks, and rice husks at 600 °C-2 h, under nitrogen flux. The prepared materials were characterized to better understand how their morphological, textural, physical-chemical and/or structural properties correlate with their methylene blue (MB) adsorption capacities. The material with the best properties (mainly SBET > 800 m²/g) and MB adsorption capacity was a novel biochar prepared from banana rachis (BW-BC). This novel material was selected for additional kinetics and equilibrium adsorption tests for lead (Pb) along with its energy storage capacity. In equilibrium test, the novel biochar reached a maximum adsorption capacity for methylene blue of 243.4 mg/g and the highest adsorption capacity for Pb(II) of 179.7 mg/g. In the kinetic adsorption test, the equilibrium adsorption value for methylene blue was 150.4 mg/g and that for Pb(II) was 159.6 mg/g. Most importantly, the performance of the BW-BC material for energy storage in supercapacitors surpassed that of the commercial activated carbon YP50F, reaching specific energy values of 6.66 and 8.52 Wh/kg in acidic and neutral electrolytes, respectively. Among the evaluated hydrochar and biochars derived of agrowastes, the biochar prepared from banana rachis showed the best properties, being potentially useful as adsorbent or as an electrode material for energy storage.

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Series: Journal of environmental chemical engineering
ISSN: 2213-2929
ISSN-E: 2213-3437
ISSN-L: 2213-2929
Volume: 9
Issue: 5
Article number: 105979
DOI: 10.1016/j.jece.2021.105979
Type of Publication: A1 Journal article – refereed
Field of Science: 218 Environmental engineering
Funding: The authors would like to thank Universidad Nacional de Tumbes (CANON Projects) and Peruvian National Council for Science and Technology (CONCYTEC) (Contract N° 024–2016-FONDECYT and Contract N ° 160–2018-FONDECYT) for financial support of this project. The Institute of Environmental Technology – Excellent Research (No. CZ.02.1.01/0.0/0.0/16_019/ 0000853) and the ESF in “Science without borders” project, reg. nr. CZ.02.2.69/0.0/0.0/16_027/0008463 within the Operational Program Research, Development and Education were thanked. D.R. Lobato-Peralta would like to thank the National Council of Science and Technology (CONACYT) for the grant for his Ph.D. studies and the projects IG100217 PAPIIT-DGAPA and 279953 from CONACYT. Thanks to Eber Herrera who participated in the experimental work.
Copyright information: © 2021. This manuscript version is made available under the CC-BY-NC-ND 4.0 license