Zecchi Silvia, Ruscillo Fabrizio, Cristoforo Giovanni, Bartoli Mattia, Loebsack Griffin, Kang Kang, Piatti Erik, Torsello Daniele, Ghigo Gianluca, Gerbaldo Roberto, Giorcelli Mauro, Berruti Franco, Tagliaferro Alberto
Department of Applied Science and Technology, Politecnico di Torino, C.so Duca degli Abruzzi 24, 10129 Torino, Italy.
Center for Sustainable Future Technologies, Italian Institute of Technology, Via Livorno 60, 10144 Torino, Italy.
Micromachines (Basel). 2023 Feb 11;14(2):429. doi: 10.3390/mi14020429.
Waste stream valorization is a difficult task where the economic and environmental issues must be balanced. The use of complex metal-rich waste such as red mud is challenging due to the wide variety of metal oxides present such as iron, aluminum, and titanium. The simple separation of each metal is not economically feasible, so alternative routes must be implemented. In this study, we investigated the use of red mud mixed with hemp waste to produce biochar with high conductivity and good magnetic properties induced by the reduction of the metal oxides present in the red mud through carbothermal processes occurring during the co-pyrolysis. The resulting biochar enriched with thermally-reduced red mud is used for the preparation of epoxy-based composites that are tested for electric and magnetic properties. The electric properties are investigated under DC (direct current) regime with or without pressure applied and under AC (alternating current) in a frequency range from 0.5 up to 16 GHz. The magnetic measurements show the effective tailoring of hemp-derived biochar with magnetic structures during the co-pyrolytic process.
废物流增值是一项艰巨的任务，必须平衡经济和环境问题。使用诸如赤泥之类的富含复杂金属的废物具有挑战性，这是因为存在多种金属氧化物，如铁、铝和钛。简单地分离每种金属在经济上并不可行，因此必须采用替代途径。在本研究中，我们研究了将赤泥与大麻废料混合，通过共热解过程中发生的碳热过程还原赤泥中存在的金属氧化物，从而制备具有高导电性和良好磁性的生物炭。所得富含热还原赤泥的生物炭用于制备环氧基复合材料，并对其电学和磁学性能进行测试。电学性能在施加或不施加压力的直流（DC）状态下以及在0.5至16 GHz频率范围内的交流（AC）状态下进行研究。磁性测量表明，在共热解过程中，大麻衍生的生物炭的磁性结构得到了有效调整。
