Idris Salah Ali Mahgoub
Chemistry Department, Faculty of Science, University of Omar Al-Mukhtar, Tobruk, Libya.
J Colloid Interface Sci. 2015 Feb 15;440:84-90. doi: 10.1016/j.jcis.2014.10.022. Epub 2014 Oct 29.
This paper describes studies of functionalized mesoporous silica employed as adsorbent for Mn(II) from aqueous solutions. The surface area of MCM-41 and diethylenetriamine functionalized-MCM-41 used in this study were 760 and 318 m(2) g(-1) (N2 adsorption). A strong dependence on pH in the Mn(II) adsorption capacity and best results were obtained at pH 6.5-7. The adsorption onto the diethylenetriamine functionalized-MCM-41 followed the pseudo-second-order kinetic model and the highest reaction rate 0.324 min(-1) was observed at low initial concentration 10 ppm. The equilibrium data showed excellent correlation with the Langmuir isotherm model and the maximum adsorption capacity of Mn(II) reached 88.9 mg/g for DETA-MCM-41 indicating that the adsorption occurs on a homogeneous surface by monolayer sorption without interaction between the adsorbed ions. These data contribute to the understanding of mechanisms involved in mesoporous silica and provide some practical clues to improve the adsorption efficiency (uptake capacity and kinetics) of Mn(II) ions.
本文描述了将功能化介孔二氧化硅用作从水溶液中吸附锰（II）的吸附剂的研究。本研究中使用的MCM-41和二乙烯三胺功能化的MCM-41的表面积分别为760和318 m² g⁻¹（N₂吸附法）。锰（II）吸附容量对pH有强烈依赖性，在pH 6.5 - 7时获得最佳结果。在二乙烯三胺功能化的MCM-41上的吸附遵循准二级动力学模型，在低初始浓度10 ppm时观察到最高反应速率0.324 min⁻¹。平衡数据与朗缪尔等温线模型具有良好的相关性，对于DETA-MCM-41，锰（II）的最大吸附容量达到88.9 mg/g，这表明吸附是通过单层吸附在均匀表面上发生的，吸附离子之间没有相互作用。这些数据有助于理解介孔二氧化硅所涉及的机制，并为提高锰（II）离子的吸附效率（吸附容量和动力学）提供一些实际线索。
