As an efficient technique for treatment of dye contaminated water, adsorption process has drawn wide research attention. However, conventional sorbents are mainly powdery and difficult to separate, which severely limited their practical application. Herein, a series of polyurethane foam (PUF) modified with carboxylate-functionalized hollow polymer particles (HPPs-COO^-) were specially designed and synthesized. Combining the advantages of both open-cell foams and functional HPPs, the as-prepared HPPs-COO^-/PUF can be utilized as advanced adsorbents towards cationic dyes (i. e., methylene blue b-MB). Batch adsorption experiments were performed to evaluate and optimize various parameters affecting the adsorption performance of HPPs-COO^-/PUF, including the content (mass ratio) of HPPs-COO^-, initial b-MB concentration, and solution pH. The experimental data demonstrated that the adsorption isotherm results fitted well with Langmuir model, possessing maximum sorption capacity of 125 mg/g at pH = 10 (25 °C). Furthermore, the adsorption process was better described by the pseudo-second order kinetic equation. Besides, the HPPs-COO^-/PUF exhibit a remarkable pH-sensitive sorption capacity. When the pH value changed from 10.0 to 2.0, the sorption capacity of HPPs-COO^-/PUF dropped sharply from 115.6 mg/g to 26 mg/g. Hence, regeneration of b-MB containing HPPs-COO^-/PUF can be effectively realized. The recovered HPPs-COO^-/PUF show > 90% b-MB removal efficiency during five adsorption–desorption processes, demonstrating excellent recyclability. With advantages of facile preparation, high adsorption capacity, and outstanding reusability, the HPPs-COO^-/PUF showed great potential for dye wastewater treatment.

吸附法作为一种有效的染料污染水处理技术，受到了广泛的研究关注。然而，常规吸附剂以粉状为主，难以分离，严重限制了其实际应用。在此，专门设计并合成了一系列用羧酸酯官能化中空聚合物颗粒（HPPs-COO ^-）改性的聚氨酯泡沫（PUF）。结合开孔泡沫和功能性 HPP 的优点，所制备的 HPPs-COO ^- /PUF 可用作阳离子染料（即亚甲蓝b -MB）的高级吸附剂。进行批量吸附实验以评估和优化影响HPPs-COO吸附性能的各种参数^-/PUF，包括HPPs-COO ^-的含量（质量比）、初始b -MB 浓度和溶液pH。实验数据表明吸附等温线结果与朗缪尔模型非常吻合，在 pH = 10 (25 °C) 下具有 125 mg/g 的最大吸附容量。此外，吸附过程可以用拟二级动力学方程更好地描述。此外，HPPs-COO ^- /PUF 表现出显着的 pH 敏感吸附能力。当 pH 值由 10.0 变为 2.0 时，HPPs-COO ^- /PUF的吸附容量从 115.6 mg/g 急剧下降到 26 mg/g。因此，可以有效地实现含有HPPs-COO ^- /PUF的b -MB 的再生。回收的 HPPs-COO^- /PUF在五个吸附-解吸过程中显示 > 90% 的b -MB 去除效率，显示出优异的可回收性。HPPs-COO ^- /PUF具有制备容易、吸附容量大、重复使用性好等优点，在染料废水处理中显示出巨大的潜力。