Production of a bio-magnetic adsorbent via co-pyrolysis of pine wood waste and red mud

[Display omitted] •Simultaneous waste biomass and red mud reduction and fabrication of magnetic adsorbent.•Comprehensive characterizations to reveal the co-pyrolysis reaction mechanism.•Identifying primary adsorption mechanisms using different organic compounds.•Highest adsorption of ibuprofen obser...

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Bibliographic Details
Published in:Waste management (Elmsford) 2022-07, Vol.149, p.124-133
Main Authors: Kang, Kang, Loebsack, Griffin, Sarchami, Tahereh, Klinghoffer, Naomi B., Papari, Sadegh, Yeung, Ken K.-C., Berruti, Franco
Format: Article
Language:eng
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Summary:[Display omitted] •Simultaneous waste biomass and red mud reduction and fabrication of magnetic adsorbent.•Comprehensive characterizations to reveal the co-pyrolysis reaction mechanism.•Identifying primary adsorption mechanisms using different organic compounds.•Highest adsorption of ibuprofen observed at 21.01 mg/g at ∼pH 4.5 on the Red mud-Pine wood-800 °C adsorbent.•Strong π stacking interaction is the dominant adsorption mechanism for organic pollutants. The efficient reduction of accumulated waste biomass and red mud by converting them into a value-added magnetic adsorbent is both difficult and tempting in terms of sustainability. This study focused on investigating the reaction mechanism of co-pyrolysis of different biomasses, including pine wood, cellulose, and lignin, with red mud at 500, 650, and 800 °C, and the comprehensive characterizations of the produced bio-magnetic particles. The performance of biomass and red mud based magnetic adsorbents is also evaluated, and their primary adsorption mechanisms for organic pollutants are revealed by using different organic model compounds. The samples produced at 800 °C showed the best performance. For example, the sample prepared using red mud and pine wood at 800 °C showed the highest adsorption capacity of ibuprofen, which was 21.01 mg/g at ∼pH 4.5, indicating strong π stacking interactions as the dominant adsorption mechanism. When compared to lignin-rich biomass, adsorbents composed of cellulose-rich biomass showed greater adsorption efficacy. The findings show that co-pyrolysis of biomass with red mud can reduce waste while also producing a flexible adsorbent that is magnetically separable and effective at absorbing different organic contaminants from water.
ISSN:0956-053X
1879-2456