Department of Chemistry, Faculty of Science, University of Tabuk, Tabuk, 71491, Saudi Arabia.
Sci Rep. 2022 Mar 16;12(1):4547. doi: 10.1038/s41598-022-08543-z.
In this study, Seeds powder of Foeniculum vulgare was used to prepare a novel adsorbent, the modification of the prepared adsorbent was done by each of ZnCl, oxalic acid, and CuS, all samples have been characterized by different techniques and examined for Potassium permanganate (KMnO) adsorption. Among the four modified and unmodified adsorbents, the sample modified by oxalic acid has the highest percentage removal for KMnO adsorption (%R = 89.36). The impact of KMnO concentration, adsorbent dose, contact temperature, contact time, and solution pH on the adsorption performance was also investigated. The experimental data of this adsorption was analyzed by different kinetic and isotherm models. As Constants of thermodynamic ΔG°, ΔH°, and ΔS° have been also evaluated. Surface area, pore volume, and pore size of the modified oxalic acid F. vulgare seeds powder adsorbent were determined as 0.6806 m g, 0.00215 cm g, and 522.063 Å, as pH also was stated to be 7.2. The R values obtained from applying different isotherm and kinetic models (0.999 and 0.996) showed that the adsorption performance of KMnO follows the Langmuir and Pseudo 2nd order models. Furthermore, high adsorption capacities of 1111.11, 1250.00, and 1428.57 mg g were achieved at three temperatures that were used in this study. Constants of thermodynamic ΔG°, ΔH°, and ΔS° values indicate chemical and spontaneous adsorption at the adsorbent surface. Therefore, the modified adsorbent can be used to remove KMnO dye from pollutant water samples.
在这项研究中，使用了茴香籽粉来制备一种新型吸附剂，通过 ZnCl、草酸和 CuS 分别对制备的吸附剂进行了改性，所有样品均通过不同的技术进行了表征，并对高锰酸钾（KMnO）吸附进行了研究。在四种改性和未改性的吸附剂中，用草酸改性的样品对 KMnO 吸附的去除率最高（%R=89.36）。还研究了 KMnO 浓度、吸附剂剂量、接触温度、接触时间和溶液 pH 对吸附性能的影响。该吸附的实验数据通过不同的动力学和等温线模型进行了分析。此外，还评估了热力学ΔG°、ΔH°和ΔS°常数。改性草酸茴香籽粉吸附剂的表面积、孔体积和孔径分别为 0.6806 m²/g、0.00215 cm³/g 和 522.063 Å，pH 值为 7.2。应用不同的等温线和动力学模型（0.999 和 0.996）得到的 R 值表明，KMnO 的吸附性能遵循朗缪尔和拟二级模型。此外，在本研究中使用的三种温度下，实现了 1111.11、1250.00 和 1428.57 mg/g 的高吸附容量。热力学ΔG°、ΔH°和ΔS°常数的值表明，在吸附剂表面发生了化学和自发吸附。因此，改性吸附剂可用于去除污染水样中的 KMnO 染料。
