The aim of this study was the development of a new synthesis route employing a modified Pechini approach and soybean husk as carbon precursor to obtain low-cost magnetic-activated carbons to be employed for adsorption. The as-obtained adsorbents were magnetic and demonstrated a strong affinity towards phenolic compounds adsorption, since an uptake of 418 mg of caffeic acid (a model phenolic compound) per g of adsorbent was observed for the sample containing 1.3% Fe. The best adsorbent was also successfully employed to remove organics from a real wastewater from a coffee processing wastewater. In this case, the adsorption capacity (50 mg/g) was lower than the observed for caffeic acid due to the competition with other compounds present in the wastewater. Here, we demonstrated that the Fe content, phase formation, and graphitization degree have influence not only on the magnetic properties but also on the adsorption capacity. The novel synthesis procedure proposed in this work, besides facile and inexpensive, having the advantage of being environmentally friendly and viable for large-scale application since the magnetic field facilitates the solid-liquid separation.

这项研究的目的是开发一种新的合成路线，该路线将采用改良的Pechini方法，并以大豆壳作为碳前体，从而获得可用于吸附的低成本磁活化碳。所获得的吸附剂是磁性的，并且表现出对酚类化合物吸附的强烈亲和力，因为对于含1.3％Fe的样品，每克吸附剂吸收了418 mg咖啡酸（模型酚类化合物）。最好的吸附剂也已成功用于从咖啡加工废水中去除真实废水中的有机物。在这种情况下，由于与废水中存在的其他化合物竞争，因此吸附量（50 mg / g）低于咖啡酸。在这里，我们证明了铁含量，相形成，石墨化程度不仅影响磁性，而且影响吸附容量。在这项工作中提出的新颖的合成方法，除了容易和廉价之外，还具有对环境友好和对大规模应用可行的优点，因为磁场促进了固液分离。