ABSTRACT

In this work, novel magnetic nanocomposite adsorbents were prepared by crosslinking β-cyclodextrin (β-CD) onto chitosan backbones by using epichlorohydrin as a crosslinker and in the presence of Fe₃O₄ nanoparticles. The composition of β-CD-chitosan nanocomposites was characterized via FTIR, XRD, TEM, SEM, and VSM. Then, the as-prepared nanocomposites were treated for elimination of methyl orange (MO). The results indicated that the adsorption of MO exhibited a maximum adsorption capacity of 314 mg g⁻¹ at 25°C. Moreover, the rates and isotherm data of adsorption matched excellent at different MO concentrations (10, 60, and 120 mg/L) using second-order and Langmuir models with the regression coefficient (R²) of 0.9993 and 9990, respectively. Besides, the thermodynamic data confirmed MO adsorption as an endothermic process. The adsorbent was also confirmed as good materials for re-use and maintained 88% of its initial adsorption capacity for MO after the fifth regeneration cycles. In conclusion, the synthesized magnetic nanocomposites can be applied as cost-effective dye adsorbents with high regeneration efficiency.

摘要

在这项工作中，通过使用表氯醇作为交联剂并在Fe ₃ O ₄纳米粒子的存在下，将β-环糊精（β-CD）交联到壳聚糖骨架上，制备了新型磁性纳米复合吸附剂。β-CD-壳聚糖纳米复合材料的组成通过FTIR，XRD，TEM，SEM和VSM表征。然后，对制备好的纳米复合材料进行处理，以消除甲基橙（MO）。结果表明，在25℃下，MO的吸附表现出最大吸附容量为314mg g ^-1。此外，使用具有回归系数（R ²）分别为0.9993和9990）。此外，热力学数据证实了MO吸附是吸热过程。吸附剂也被确认为可重复使用的良好材料，并在第五次再生循环后保持了其最初对MO的吸附能力的88％。总之，合成的磁性纳米复合材料可作为具有高再生效率的具有成本效益的染料吸附剂。