Ali Nisreen S, Jabbar Noor M, Alardhi Saja M, Majdi Hasan Sh, Albayati Talib M
Mustansiriyah University, College of Engineering, Materials Engineering Department, Baghdad, Iraq.
Biochemical Engineering Department, Al-Khwarizmi Engineering College, University of Baghdad, Baghdad, Iraq.
Heliyon. 2022 Aug 15;8(8):e10276. doi: 10.1016/j.heliyon.2022.e10276. eCollection 2022 Aug.
Raw date seeds, as prospective natural, broadly obtainable and low-price agricultural waste for adsorbing cationic dyes from aqueous solutions, have been studied. In this work, Iraqi date seeds were prepared and characterised using X-ray diffraction (XRD), scanning electron microscopy (SEM), Fourier transform infrared (FTIR) spectroscopy and Brunauer-Emmett-Teller (BET) surface area analysis before being used as an efficient bio-adsorbent for methyl violet (MV) dye removal. Adsorption tests were conducted with three investigated parameters, namely, time of contact, first adsorbate concentration and adsorbent dose. Compared with the pseudo first-order model (coefficient of determination = 0.9001), the pseudo second-order model was determined to be the best-fitting model with a coefficient of determination (R) of 0.9917. The equilibrium isotherms for MV were obtained, and their ultimate capacity of adsorption was (59.5 mg g). Two isotherm models, Langmuir and Freundlich, were studied to fit the equilibrium data. Compared with the Freundlich isotherm model (R = 0.8154), the Langmuir model functioned better as an adsorption isotherm with R of 0.9837. In addition, the adsorption process was endothermic and spontaneous. The date seeds acted as active adsorbents to remove MV from the aqueous solutions in the model experiments.
椰枣种子作为一种潜在的天然、广泛可得且价格低廉的农业废弃物，已被用于研究从水溶液中吸附阳离子染料。在这项工作中，伊拉克椰枣种子在被用作去除甲基紫（MV）染料的高效生物吸附剂之前，通过X射线衍射（XRD）、扫描电子显微镜（SEM）、傅里叶变换红外（FTIR）光谱和布鲁诺尔-埃米特-特勒（BET）表面积分析进行了制备和表征。吸附试验针对三个研究参数进行，即接触时间、初始吸附质浓度和吸附剂剂量。与伪一级模型（决定系数 = 0.9001）相比，伪二级模型被确定为最佳拟合模型，决定系数（R）为0.9917。获得了甲基紫的平衡等温线，其最终吸附容量为（59.5毫克/克）。研究了两种等温线模型，即朗缪尔模型和弗伦德里希模型，以拟合平衡数据。与弗伦德里希等温线模型（R = 0.8154）相比，朗缪尔模型作为吸附等温线的拟合效果更好，R为0.9837。此外，吸附过程是吸热且自发的。在模型实验中，椰枣种子作为活性吸附剂从水溶液中去除了甲基紫。
