Novel adsorbents, poly([2-(methacryloxy)ethyl]trimethylammonium chloride) modified magnetic chitosan particles (DMCPs), were synthesized via free radical polymerization and applied to adsorb Cr(VI) from aqueous solution. The effects of pH (2–11), Cr(VI) concentration (10–200 mg/L) and contact time (0–420 min) on the adsorption performance were evaluated. The results showed that the adsorption capacity of DMCPs was much larger than that of magnetic chitosan particles (MCPs) in the examined pH range and decreased with Cl⁻ concentration increasing, indicating that electrostatic interaction and ion exchange are the governing mechanisms of Cr(VI) adsorption by DMCPs. The Langmuir isotherm model and pseudo-second-order kinetic model fitted the experimental data well. The maximum adsorption capacity of DMCPs is 153.85 mg/g. Besides, Cr(VI)-loaded DMCPs could be easily separated and efficiently regenerated. Therefore, DMCPs are promising candidates for Cr(VI) adsorption owing to their excellent performance in a wide pH range, easy separation and good reusability.

通过自由基聚合合成了新型的吸附剂，聚（[2-（甲基丙烯酰氧基）乙基]三甲基氯化铵）改性的磁性壳聚糖颗粒（DMCPs），并将其应用于从水溶液中吸附Cr（VI）。评估了pH（2-11），Cr（VI）浓度（10-200 mg / L）和接触时间（0-420分钟）对吸附性能的影响。结果表明，在所考察的pH范围内，DMCPs的吸附能力远大于磁性壳聚糖颗粒（MCPs），并随着Cl-的降低而降低^。浓度增加，表明静电相互作用和离子交换是DMCP吸附Cr（VI）的控制机理。Langmuir等温线模型和伪二阶动力学模型很好地拟合了实验数据。DMCP的最大吸附容量为153.85 mg / g。此外，Cr（VI）负载的DMCP可以轻松分离并有效再生。因此，由于DMCP在宽pH范围内的优异性能，易于分离和良好的可重复使用性，它们有望成为Cr（VI）吸附的候选者。