In this work, we applied a novel dithiocarbamate-grafted star-like polymer for efficient reclamation of cationic dyes. This material is highly selective towards cationic dyes and almost completely rejective to anionic dyes. The adsorption kinetics, isotherms, and thermodynamics were systematically investigated to analyze the adsorption behavior of cationic dyes onto the material. As compared with other reported adsorbents, this cheap and facilely-prepared material has exceptional adsorption capacities for industrial cationic dyes, e.g., methylene blue (MB, 2624 mg/g), crystal violet (CV, 2553 mg/g), basic fuchsin (BF, 1729 mg/g), and methylene violet 3RAX (MV, 1239 mg/g), being 5-11 times of that reported in literatures. Based on the effects of pH and ionic strength on adsorption, competitive adsorption of the cationic dyes, and FTIR characterization, mechanisms for the adsorption and desorption of cationic dyes were proposed. The adsorbed dyes can be recovered over 95% just by immersing into diluted HCl solution (0.01 M) for 10 min, thus avoiding organic solvent extraction. Over 98% of the adsorption capacity was maintained during consecutive reclamation operation. Due to the high selectivity, high adsorption capacity and the ease of efficient regeneration, this material is potentially applicable for targeted reclamation of cationic dyes from dyeing wastewater.

在这项工作中，我们应用了新型的二硫代氨基甲酸酯接枝的星形聚合物，以有效地回收阳离子染料。该材料对阳离子染料具有高度选择性，对阴离子染料几乎完全具有排斥性。系统地研究了吸附动力学，等温线和热力学，以分析阳离子染料在材料上的吸附行为。与其他报道的吸附剂相比，这种廉价且易于制备的材料对工业阳离子染料具有出色的吸附能力，例如亚甲基蓝（MB，2624 mg / g），结晶紫（CV，2553 mg / g），碱性品红（ BF（1729 mg / g）和亚甲基紫3RAX（MV，1239 mg / g），是文献报道的5-11倍。根据pH和离子强度对阳离子染料吸附，竞争性吸附的影响，并通过FTIR表征，提出了阳离子染料吸附和解吸的机理。只需将其浸入HCl稀释溶液（0.01 M）中10分钟，即可回收95％以上的吸附染料，从而避免了有机溶剂的萃取。在连续的回收操作过程中，保持了超过98％的吸附能力。由于高选择性，高吸附能力和高效再生的简便性，该材料潜在地可用于从染色废水中靶向回收阳离子染料。在连续的回收操作过程中，保持了超过98％的吸附能力。由于高选择性，高吸附能力和高效再生的简便性，该材料潜在地可用于从染色废水中靶向回收阳离子染料。在连续的回收操作过程中，保持了超过98％的吸附能力。由于高选择性，高吸附能力和高效再生的简便性，该材料潜在地可用于从染色废水中靶向回收阳离子染料。