Production and characterization of porous magnetic biochar : before and after phosphate adsorption insights
Loading...
Access rights
openAccess
publishedVersion
URL
Journal Title
Journal ISSN
Volume Title
A1 Alkuperäisartikkeli tieteellisessä aikakauslehdessä
This publication is imported from Aalto University research portal.
View publication in the Research portal (opens in new window)
View/Open full text file from the Research portal (opens in new window)
Other link related to publication (opens in new window)
View publication in the Research portal (opens in new window)
View/Open full text file from the Research portal (opens in new window)
Other link related to publication (opens in new window)
Authors
Date
2022-06
Major/Subject
Mcode
Degree programme
Language
en
Pages
11
Series
Journal of Porous Materials, Volume 29, issue 3, pp. 849-859
Abstract
The modification process of biochars enables different advantages including enhanced adsorption properties for different pollutants. Herein, porous magnetic biochars (PMB) were successfully produced from softwood biomass through a two-step pyrolysis process together with FeCl3 modification. The effect of production temperature on adsorption was studied at 200 or 300 °C, followed by iron salt modification and subsequent pyrolysis at 600 or 800 °C. Biochars were characterized before and after phosphate adsorption via various characterization methods to acquire structural, elemental, and morphological properties of the adsorbent. The effects of phosphate concentration, contact time, and temperature on the adsorption process were examined in the batch mode. The characterization showed embedded iron oxide crystals of 23 nm within the biochar structure with a magnetic strength of 38.9 emu/g, which can assist the separation process of the powdered adsorbent from the aqueous medium. The surface area of the PMB was measured as 93 m2/g and 0.002 cm3/g pore volume. PMB showed complete removal (100%) of phosphate at the lower concentration (5 mg/l P). At higher concentration (25 mg/l P), the biochar prepared under 200/800 °C showed the highest removal (30%). The adsorption was enhanced with time (optimal 3 h) and temperature, which shows endothermic chemisorption following Langmuir isotherm and Pseudo-second order kinetic models. The desorption study suggested the slow release of phosphate from the spent adsorbent and potential reuse for soil enhancement. These results point towards the sustainable use of PMB as an effective and magnetically recyclable adsorbent for phosphate removal and reclaim.Description
Funding Information: Open Access funding provided by Aalto University. This research was funded by Aalto University Doctoral Programme for Engineering (D/23/00.01.02.00/2019), Maa ja vesitekniikan tuki ry (Grant 388823), and the Academy of Finland (343192). Publisher Copyright: © 2022, The Author(s).
Keywords
Adsorption, Characterization, Chemical activation, Phosphate removal, Porous magnetic biochar, Water treatment
Other note
Citation
Tomin, O & Yazdani, M R 2022, ' Production and characterization of porous magnetic biochar : before and after phosphate adsorption insights ', Journal of Porous Materials, vol. 29, no. 3, pp. 849-859 . https://doi.org/10.1007/s10934-022-01217-1