Removing organic dyes from wastewater is an important task of environmental remediation. In this work, a nano composite α-Fe₂O₃/graphene oxide (α-Fe₂O₃/GO) was fabricated with a facile hydrothermal process. The as fabricated α-Fe₂O₃/GO was characterized and tested as adsorbent for removing two typical ionic dyes Congo red (CR) and methyl violet (MV) from aqueous solutions. The interaction mechanisms of α-Fe₂O₃/GO with CR and MV were analyzed. Findings presents, synergistic effect between α-Fe₂O₃ and GO made α-Fe₂O₃/GO outperform either α-Fe₂O₃ or GO. α-Fe₂O₃/GO exhibited high adsorption capacity and cycling performance, most importantly, ultrafast adsorption kinetics especially on MV. Adsorptions of CR and MV equilibrated in 8 min and 5 min, the corresponding adsorption percent/quantity were 95.78%/239.45 mgg⁻¹ and 99.907%/1998.14 mgg⁻¹, respectively. The good adsorption performance of α-Fe₂O₃/GO originated from its thin morphology, abundant oxygen containing groups, as well as strong chemical interaction with CR and MV. The adsorptions were thermodynamically spontaneous and endothermic, while kinetically controlled by surface reaction. Hydrogen bond and π–π interaction was the primary interaction mechanism between adsorbate and adsorbent. The merits including simple fabrication and superior adsorption performance may endow α-Fe₂O₃/GO promising application in removing organic dyes.

从废水中去除有机染料是环境修复的重要任务。在这项工作中，通过便捷的水热工艺制备了纳米复合材料α -Fe ₂ O ₃ /氧化石墨烯（α -Fe ₂ O ₃ / GO）。对制成的α -Fe ₂ O ₃ / GO进行了表征，并测试了其作为吸附剂的作用，可从水溶液中去除两种典型的离子染料刚果红（CR）和甲基紫（MV）。分析了α -Fe ₂ O ₃ / GO与CR和MV的相互作用机理。研究结果表明，α -Fe之间有协同作用₂ O ₃和GO使α -Fe ₂ O ₃ / GO的性能优于α -Fe ₂ O ₃或GO。α -Fe ₂ O ₃ / GO表现出高吸附能力和循环性能，最重要的是，特别是在MV上具有超快吸附动力学。CR和MV的吸附在8分钟和5分钟内达到平衡，相应的吸附百分比/量分别为95.78％/ 239.45 mgg ^-1和99.907％/ 1998.14 mgg ^-1。α -Fe ₂ O ₃的良好吸附性能/ GO源于其薄的形态，丰富的含氧基团以及与CR和MV的强化学相互作用。吸附是热力学上自发的和吸热的，而通过表面反应进行动力学控制。氢键和π - π相互作用是被吸附物与吸附剂之间的主要相互作用机理。优劣，包括简单的制造和优良的吸附性能可赋予α -Fe ₂ ö ₃ / GO有为在去除有机染料应用。