Chromium pollution is a serious environmental problem given that like most heavy metals, Cr tends to persist and accumulate in the environment. In this study, diethylenetriaminepentaacetic acid–thiourea-modified magnetic chitosan (DTCS-Fe₃O₄) was synthesized for use as an adsorbent for Cr(VI) removal from aqueous solutions. The effects of various treatment conditions on the Cr(VI) adsorption performance of DTCS-Fe₃O₄ composite as well as the kinetics were elucidated. Moreover, by observing the structure and morphology of DTCS-Fe₃O₄, the possible Cr(VI) adsorption mechanism was proposed. DTCS-Fe₃O₄ exhibited a maximum adsorption capacity of 321.3 ± 6.0 mg g⁻¹. Further, the adsorption process, which followed the Langmuir model for monolayer adsorption, was predominantly governed by chemical adsorption, and could be fitted using the pseudo-second-order kinetics model. Furthermore, given its ease of preparation, low cost, and remarkable performance, it is expected that the DTCS-Fe₃O₄ composite would find wide practical application in the removal of toxic Cr(VI) from wastewater.

铬污染是一个严重的环境问题，因为与大多数重金属一样，铬往往会在环境中持续存在和积累。在本研究中，合成了二亚乙基三胺五乙酸-硫脲修饰的磁性壳聚糖 (DTCS-Fe ₃ O ₄ ) 作为吸附剂从水溶液中去除 Cr(VI)。阐明了各种处理条件对 DTCS-Fe ₃ O ₄复合材料的 Cr(VI) 吸附性能以及动力学的影响。此外，通过观察DTCS-Fe ₃ O ₄的结构和形貌，提出了可能的Cr(VI)吸附机制。DTCS-Fe ₃ O ₄表现出321.3 ± 6.0 mg g ^-1的最大吸附容量。此外，遵循用于单层吸附的朗缪尔模型的吸附过程主要由化学吸附控制，并且可以使用伪二级动力学模型进行拟合。此外，鉴于其易于制备、成本低和卓越的性能，预计 DTCS-Fe ₃ O ₄复合材料将在去除废水中的有毒 Cr(VI) 中得到广泛的实际应用。