Pazoki Hosein, Anbia Mansoor
Research Laboratory of Nanoporous Materials, Faculty of Chemistry, Iran University of Science and Technology, Tehran, Iran.
Sci Rep. 2025 Apr 1;15(1):11088. doi: 10.1038/s41598-024-72839-5.
This study investigates Cr (VI) removal from an aqueous solution by a synthetic chitosan-allophane nanocomposite. The nanocomposite was synthesized using the solvothermal method. The adsorbent was characterized utilizing X-ray diffraction (XRD), Fourier transform infrared (FT-IR), scanning electron microscopy (SEM) images, and the Brunauer-Emmet-Teller (BET) method. This work investigated the influence of the solid/liquid ratio, pH, contact time, and initial concentration on the adsorption process, as well as the adsorption kinetics and isotherms. The maximum adsorption capacity of the synthetic nanocomposite for Cr (VI) is 112.17 (mg/g) under optimum conditions. The kinetics study shows that the pseudo-second-order kinetic equation better describes the adsorption behavior of the adsorbent. The isotherms study suggests that the adsorption process of the synthetic chitosan-allophane nanocomposite follows the Langmuir model. Freundlich isotherm shows a better fit to the process with R = 0.97 and Freundlich constant of 42.9 L/g. The adsorption of Cr (VI) ions on adsorbent well fits to pseudo-second-order with qe: 125 mg/g. Moreover, the stability and reproducibility of the synthetic nanocomposite were investigated. This study presents a approach for synthesizing high surface area, engineered morphology, reusable, and stable nanocomposite for effectively adsorbing heavy metal ions from wastewaters.
本研究考察了合成的壳聚糖-水铝英石纳米复合材料对水溶液中Cr(VI)的去除效果。采用溶剂热法合成了该纳米复合材料。利用X射线衍射(XRD)、傅里叶变换红外光谱(FT-IR)、扫描电子显微镜(SEM)图像和布鲁诺尔-埃米特-泰勒(BET)法对吸附剂进行了表征。本工作研究了固液比、pH值、接触时间和初始浓度对吸附过程的影响，以及吸附动力学和等温线。在最佳条件下，合成的纳米复合材料对Cr(VI)的最大吸附容量为112.17(mg/g)。动力学研究表明，准二级动力学方程能更好地描述吸附剂的吸附行为。等温线研究表明，合成的壳聚糖-水铝英石纳米复合材料的吸附过程符合朗缪尔模型。弗伦德利希等温线对该过程拟合较好，R = 0.97，弗伦德利希常数为42.9 L/g。吸附剂对Cr(VI)离子的吸附很好地符合准二级动力学，qe为125 mg/g。此外，还研究了合成纳米复合材料的稳定性和可重复性。本研究提出了一种合成具有高比表面积、工程形态、可重复使用且稳定的纳米复合材料的方法，用于有效吸附废水中的重金属离子。
