To find an expeditious adsorbent for removing residual organic dyes is an urgent task, because the protection of water resource does not permit of any delay. In this work, the ternary Cu/Cu₂O/C composite with ultrahigh anionic dyes adsorption capacity was synthesized by a simple solvent-free method. The crystalline structure, chemical composition and adsorption feature of the Cu/Cu₂O/C composite were systematically studied. The maximum monolayer adsorption capacity of Cu/Cu₂O/C for methyl orange (MO) and acid blue 93 (AB93) is 1408.7 and 5385 mg g^-1, respectively. Besides, the Cu/Cu₂O/C composite can selectively adsorb anionic dyes from mixture of different dyes. A soaking process of hot water can easily release the loaded anionic dyes, and the adsorption capacity of invalid Cu/Cu₂O/C composite can be recovered by a baking process. The equilibrium and kinetic studies indicate that the adsorption process is consistent with the Langmuir isotherm theory and pseudo-second-order model. The thermodynamics parameters (ΔG°, ΔH° and ΔS°) show that the adsorption process is spontaneous and exothermic in nature. Based on the experimental data and the characterization of Cu/Cu₂O/C composite, it can conclude that the physical and chemical synergism effect co-exist in adsorption process, and chemisorption is the main rate limiting step. The excellent adsorption ability of Cu/Cu₂O/C composite is mainly attributed to the interaction between sulfonic group and Cu (Cu⁰ or Cu¹⁺). This work may shed light on developing high adsorption capacity of adsorbent for toxic organic pollutants removal and some special anion separation.

寻找一种快速的吸附剂以去除残留的有机染料是一项紧迫的任务，因为对水资源的保护不允许有任何延误。在这项工作中，通过简单的无溶剂方法合成了具有超高阴离子染料吸附能力的三元Cu / Cu ₂ O / C复合材料。系统研究了Cu / Cu ₂ O / C复合材料的晶体结构，化学组成和吸附特性。Cu / Cu ₂ O / C对甲基橙（MO）和酸性蓝93（AB93）的最大单层吸附能力分别为1408.7和5385 mg g ^-1。此外，Cu / Cu ₂O / C复合材料可以从不同染料的混合物中选择性吸附阴离子染料。热水的浸泡过程很容易释放负载的阴离子染料，并且通过烘烤可以回收无效的Cu / Cu ₂ O / C复合材料的吸附能力。平衡和动力学研究表明，吸附过程与Langmuir等温理论和伪二级模型一致。热力学参数（ΔG°，ΔH°和ΔS°）表明，吸附过程是自然发生的，并且是放热的。根据实验数据和Cu / Cu ₂的表征在O / C复合材料中，可以得出理化协同作用在吸附过程中并存的结论，化学吸附是主要的限速步骤。Cu / Cu ₂ O / C复合材料的优异吸附能力主要归因于磺酸基与Cu（Cu ⁰或Cu ¹⁺）之间的相互作用。这项工作可能有助于开发具有高吸附能力的吸附剂，以去除有毒有机污染物和进行一些特殊的阴离子分离。