Institute for Chemicals and Fuels from Alternative Resources (ICFAR), Western University, London, Ontario, Canada; Department of Chemical and Biochemical Engineering, Western University, London, Ontario, Canada.
Department of Chemistry, Western University, London, Ontario, Canada.
Waste Manag. 2022 Jul 15;149:124-133. doi: 10.1016/j.wasman.2022.06.009. Epub 2022 Jun 18.
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.
将积累的废生物质和赤泥有效地转化为增值的磁性吸附剂，从可持续性的角度来看，这既困难又诱人。本研究重点研究了不同生物质（包括松木、纤维素和木质素）与赤泥在 500、650 和 800°C 下共热解的反应机制，以及所产生的生物磁性颗粒的综合特性。还评估了生物质和赤泥基磁性吸附剂的性能，并通过使用不同的有机模型化合物揭示了它们对有机污染物的主要吸附机制。在 800°C 下生产的样品表现出最佳性能。例如，在 800°C 下使用赤泥和松木制备的样品对布洛芬的吸附容量最高，在 pH 值约为 4.5 时为 21.01mg/g，表明强π堆积相互作用是主要的吸附机制。与富含木质素的生物质相比，由富含纤维素的生物质组成的吸附剂表现出更高的吸附效果。研究结果表明，生物质与赤泥的共热解不仅可以减少废物，还可以生产出一种灵活的吸附剂，该吸附剂具有磁性可分离性，能够有效地从水中吸收不同的有机污染物。
