In order to overcome the difficulties in separating the powdered adsorbent from the aqueous solution, a novel δ-MnO₂/polymer millimeter-sized bead adsorbent (MPBs) was synthesized by phase-inversion method. The structure and surface characteristics of the obtained adsorbents were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), N₂ adsorption-desorption (N₂-AD), Fourier transform infrared spectrum (FT-IR) and energy dispersive x-ray spectroscopy (EDX). Results showed that the MPBs adsorbent had a smooth surface and a porous internal structure, and the manganese dioxide maintained δ-type polymorphic forms. The millimeter-sized bead made the adsorbent ease of application and facile to regeneration in removal of heavy metal ions from aqueous solution. The adsorption properties of MPBs for Ni(II) ions were investigated on the basis of contact time, initial ions concentration and pH value of the solution. The Langmuir isotherm model and the pseudo-second-order kinetic model were applied to fit the adsorption data, and the maximum adsorption capacity of 31.71 mg g⁻¹ for Ni(II) could be inferred. The ions-loaded MPBs could be separated readily from aqueous solution with little of filter resistance and regenerated easily by acid elution.

为了克服在从水溶液中分离出粉末状的吸附剂的困难，一种新颖的δ-的MnO ₂ /聚合物毫米大小的珠吸附剂（MPBS）通过转相法合成的。通过X射线衍射（XRD），扫描电子显微镜（SEM），N ₂吸附-脱附（N ₂）对所得吸附剂的结构和表面特性进行表征。-AD），傅立叶变换红外光谱（FT-IR）和能量色散X射线光谱仪（EDX）。结果表明，MPBs吸附剂表面光滑，内部结构多孔，二氧化锰保持δ型多晶型。毫米大小的珠粒使吸附剂易于使用，并且在从水溶液中去除重金属离子时易于再生。根据接触时间，初始离子浓度和溶液的pH值，研究了MPB对Ni（II）离子的吸附性能。应用Langmuir等温线模型和拟二级动力学模型拟合吸附数据，最大吸附容量为31.71 mg g ^-1Ni（II）可以推断出来。负载离子的MPB可以很容易地从水溶液中分离出来，几乎没有过滤阻力，并且可以通过酸洗脱容易地再生。