This study describes for the first time the preparation of in-situ magnetic porous carbon beads (MPC beads) through simple phase inversion and subsequent pyrolysis of red mud doped polysulfone beads. Red mud, which is the main industrial waste resulted from the aluminium production, contains an important amount of Fe₂O₃. Characterization studies demonstrated the in-situ carbo-reduction of Fe₂O₃ species into magnetic Fe₃O₄ thanks to polysulfone carbon source, involving then the synthesis of MPC beads. Owing to hydrophobic surface and macroporous structure, the MPC beads were evaluated on the sorption of various oils, including gasoline, diesel oil, mineral oil and olive oil from water. The maximum sorption capacity of the MPC beads for examined oils were determined as olive oil (2.018 ± 0.162 g/g)>mineral oil (1.418 ± 0.138 g/g)> diesel oil (1.316 ± 0.062 g/g)>gasoline (1.235 ± 0.028 g/g). Moreover, the MPC beads were regenerable by heat treatment and there was no change in their sorption capacities in the first ten consecutive sorption-desorption cycles. Consequently, the suggested approach on the pyrolysis of waste red mud doped polysulfone beads was successful at preparing in-situ MPC beads, which can be efficiently used for oil spills clean-up from water with easier separation by a magnet.

这项研究首次描述了通过简单的相转化和随后的红泥掺杂聚砜珠的热解制备原位磁性多孔碳珠（MPC珠）的方法。赤泥是铝生产产生的主要工业废物，其中含有大量的Fe ₂ O ₃。表征研究表明，由于聚砜碳源的作用，Fe ₂ O ₃物种就地碳还原为磁性Fe ₃ O ₄，然后参与了MPC珠的合成。由于疏水表面和大孔结构，对MPC珠粒对各种油类（包括汽油，柴油，矿物油和橄榄油）从水中的吸附性进行了评估。确定MPC珠对所检查的油的最大吸附能力为橄榄油（2.018±0.162 g / g）>矿物油（1.418±0.138 g / g）>柴油（1.316±0.062 g / g）>汽油（1.235） ±0.028 g / g）。而且，MPC珠可通过热处理再生，并且在前十个连续的吸附-解吸循环中其吸附容量没有变化。因此，所建议的废旧红泥掺杂聚砜珠粒的热解方法成功地制备了原位MPC珠粒，该珠粒可以有效地用于从水中清除溢油，而且更容易被磁铁分离。