The removal of toxic hexavalent chromium (Cr(VI)) ions is highly demanded. Herein, the magnetic kaolin embedded chitosan (MKCS) beads with different mass ratios of MK/CS were prepared by a simple pH-precipitation method and applied for the removal of Cr(Ⅵ) ions from aqueous solution. Factors influencing the removal of Cr(Ⅵ) ions such as solution pH, adsorbent dosage and contact time were investigated systematically by batch experiments. The results showed that MK_0.2CS beads (the mass ratio of MK to CS equals 0.2) can remove more than 92% and 72% of Cr(Ⅵ) respectively with the initial concentrations of 40 and 60 mg/L. And the MK_0.2CS beads showed an adsorption capacity of 144.0 mg/g with the initial Cr(VI) concentration of 300 mg/L at 25 ^oC. The adsorption data is fitted well with the pseudo-first-order kinetic model, indicating that the adsorption is a physical process. The adsorption isotherm study and thermodynamic study revealed a multilayer and exothermic adsorption, respectively. After Cr(Ⅵ) uptake, the adsorbent was well-regenerated by 1 M NaOH, and the results showed that the MKCS beads can be reused successfully in repeated adsorption-desorption cycles. The MKCS beads were thoroughly characterized before and after Cr(VI) adsorption. XPS analysis revealed that the adsorption of Cr(Ⅵ) on MKCS beads could be attributed to electrostatic interaction. The results suggested that the MKCS beads can be considered as an effective and promising adsorbent for wastewater treatment.

强烈要求去除有毒的六价铬（Cr（VI））离子。本文采用简单的pH沉淀法制备了具有不同质量比的MK / CS的高岭土磁性壳聚糖（MKCS）磁珠，并用于去除水溶液中的Cr（Ⅵ）离子。通过分批实验系统地研究了溶液中pH，吸附剂用量和接触时间等影响Cr（Ⅵ）离子去除的因素。结果表明，初始浓度为40和60 mg / L时，MK _0.2 CS珠（MK与CS的质量比等于0.2）可以分别去除92％和72％以上的Cr（Ⅵ） 。MK _0.2 CS珠在25  ℃时的初始Cr（VI）浓度为300  mg / L时，吸附容量为144.0 mg / g。 ^o C.吸附数据与拟一级动力学模型吻合得很好，表明吸附是一个物理过程。吸附等温线研究和热力学研究分别显示了多层吸附和放热吸附。Cr（Ⅵ）吸收后，吸附剂被1  M NaOH充分再生，结果表明MKCS珠可以在重复的吸附-解吸循环中成功地重复使用。MKCS珠在Cr（VI）吸附之前和之后都得到了彻底的表征。XPS分析表明，Cr（Ⅵ）在MKCS微珠上的吸附可能归因于静电相互作用。结果表明，MKCS珠可以被认为是用于废水处理的有效和有前途的吸附剂。