Science and Technology Laboratory of Water and Environment, Department of Material Sciences, Faculty of Sciences and Technology, Mohammed Cherif Messaadia University, Souk Ahras, 41000, Algeria; Laboratory of Water Treatment and Valorization of Industrial Wastes, Department of Chemistry, Faculty of Sciences, University Badji Mokhtar, B.P. 12, Annaba, 23000, Algeria.
Science and Technology Laboratory of Water and Environment, Department of Material Sciences, Faculty of Sciences and Technology, Mohammed Cherif Messaadia University, Souk Ahras, 41000, Algeria.
Environ Res. 2020 Jul;186:109484. doi: 10.1016/j.envres.2020.109484. Epub 2020 Apr 8.
This study aims to remove organic cationic dye Basic Fuchsin (BF) by adsorption onto a low cost eggshell membrane (ESM) in batch mode at 293 K. XRD analysis confirms the amorphous nature of ESM meanwhile FTIR spectroscopy reveals the presence of several functional groups such as hydroxyl (-OH), sulfhydryl (-SH), carboxyl (-COOH), and amino (-NH). Morphological observations by SEM indicate its fibrous microstructure. BET analysis shows a surface area of 11.56 m g and the presence of mesopores with a volume of 6.173 10 cm g. The value of pH of ESM is 7.05. The influence of adsorbent dose, contact time, pH, temperature and dye concentration is examined. The highest adsorption capacity around 48 mg.gis achieved for a dye concentration 250 ppm, pH 6 and 25 °C. In addition, adsorption has been found to follow pseudo-second order kinetics. The analysis of the experimental data using linear forms based on Langmuir, Freundlich and Temkin isotherm models indicate that the best fit is obtained with Freundlich model. Thermodynamic parameters (Gibbs free energy, enthalpy, and entropy) reveal that the adsorption of BF onto ESM is an exothermic and spontaneous process. A comprehensive mechanism for BF adsorption by ESM has been proposed.
本研究旨在 293 K 下，通过批量吸附的方式，利用低成本的蛋壳膜（ESM）去除有机阳离子染料碱性品红（BF）。XRD 分析证实了 ESM 的非晶态性质，同时 FTIR 光谱表明存在多种官能团，如羟基（-OH）、巯基（-SH）、羧基（-COOH）和氨基（-NH）。SEM 的形貌观察表明其具有纤维状微观结构。BET 分析表明其表面积为 11.56 m²/g，存在孔体积为 6.173×10⁻⁵ cm³/g 的中孔。ESM 的 pH 值为 7.05。考察了吸附剂用量、接触时间、pH、温度和染料浓度的影响。在染料浓度为 250 ppm、pH 值为 6 和 25°C 时，吸附剂的最大吸附容量约为 48 mg/g。此外，吸附被发现遵循准二级动力学。使用基于 Langmuir、Freundlich 和 Temkin 等温模型的线性形式对实验数据进行分析表明，Freundlich 模型的拟合效果最好。热力学参数（吉布斯自由能、焓和熵）表明，BF 吸附到 ESM 上是一个放热和自发的过程。提出了一种 ESM 吸附 BF 的综合机制。
