Darweesh Mona A, Elgendy Mahmoud Y, Ayad Mohamed I, Ahmed Abdel Monem M, Kamel Elsayed N M, Hammad W A
Engineering Physics & Mathematics Department, Faculty of Engineering, Tanta University, Egypt.
Chemistry Department, Faculty of Science, Menoufia University, Egypt.
Heliyon. 2022 Apr 18;8(4):e09279. doi: 10.1016/j.heliyon.2022.e09279. eCollection 2022 Apr.
The purpose of this study is to investigate the development of a new and inexpensive adsorbent by immobilization synthesized silver nanoparticles (AgNPs) onto banana leaves powder (BLP), and the prepared composite (BLP)/(AgNPs) was used as an adsorbent for Zn(II), Pb(II), and Fe(III) ion removal from aqueous solutions under the influence of various reaction conditions. (BLP)/(AgNPs) demonstrated remarkable sensitivity toward Zn (II), Pb (II), and Fe (III) ions; metal ions eliminations increased with increasing contact time, agitation speed, adsorbent dose, and temperature, yielding adequate selectivity and ideal removal efficiency of 79%, 88%, and 91% for Zn (II), Pb (II), and Fe (III) ions, respectively, at pH = 5 for Zn(II) and pH = 6 for Pb(II), and Fe(III). The equilibrium contact time for elimination of Zn (II), Pb (II), and Fe (III) ions was reaches at 40 min. Langmuir, Freundlich, and Temkin equations were used to test the obtained experimental data. Langmuir isotherm model was found to be more accurate in representing the data of Zn(II), Pb(II), and Fe(III) ions adsorption onto (BLP)/(AgNPs), with a regression coefficient (R = 0.999) and maximum adsorption capacities of 190, 244, and 228 mg/g for Zn(II), Pb(II), and Fe(III) ions, respectively. The thermodynamic parameters proved that adsorption of metal ions is spontaneous, feasible, and endothermic, whereas Kinetic studies revealed that the process was best described by a pseudo second order kinetics.
本研究的目的是通过将合成的银纳米颗粒（AgNPs）固定在香蕉叶粉末（BLP）上来研究一种新型廉价吸附剂的开发，并将制备的复合材料（BLP）/（AgNPs）用作吸附剂，在各种反应条件的影响下从水溶液中去除Zn（II）、Pb（II）和Fe（III）离子。（BLP）/（AgNPs）对Zn（II）、Pb（II）和Fe（III）离子表现出显著的敏感性；金属离子的去除率随着接触时间、搅拌速度、吸附剂剂量和温度的增加而增加，在pH = 5（针对Zn（II））和pH = 6（针对Pb（II）和Fe（III））时，对Zn（II）、Pb（II）和Fe（III）离子的选择性良好，去除效率分别达到79%、88%和91%。去除Zn（II）、Pb（II）和Fe（III）离子的平衡接触时间在40分钟时达到。使用Langmuir、Freundlich和Temkin方程来测试获得的实验数据。发现Langmuir等温线模型在表示Zn（II）、Pb（II）和Fe（III）离子吸附到（BLP）/（AgNPs）上的数据方面更准确，回归系数（R = 0.999），Zn（II）、Pb（II）和Fe（III）离子的最大吸附容量分别为190、244和228 mg/g。热力学参数证明金属离子的吸附是自发、可行且吸热的，而动力学研究表明该过程最好用拟二级动力学来描述。
