Pb(II) adsorption on magnetic γ-Fe2O3/titanate nanotubes composite
Pb(II) adsorption on magnetic γ-Fe2O3/titanate nanotubes composite
复制标题
磁性γ-Fe2O3/钛酸盐纳米管复合材料上Pb(II)的吸附
DOI：
10.1016/j.jece.2015.07.010
复制
发表时间：
2015-09-01
影响因子：
7.7
通讯作者：
Chen, Jian
中科院分区：
文献类型：
--
作者：
Chen, Huan;Li, Ting;Chen, Jian
制备了磁性γ-Fe 2 O3/钛酸盐纳米管（TNTs）复合材料，并通过N2吸附/脱附、VSM、TEM、XRD和zeta电位分析等手段对其进行了表征。研究了γ-Fe_2O_3/TNT对Pb（Ⅱ）的吸附性能。Pb（II）通过静电吸附和与H+/Na+离子交换作用吸附在γ-Fe 2 O3/TNT表面。γ-Fe_2O_3/TNT吸附Pb（II）的动力学符合准二级动力学模型。吸附等温线符合Langmuir模型。热力学结果表明，Pb（II）在γ-Fe 2 O3/TNT上的吸附量随温度的升高而增加，吸附过程是自发的吸热过程. Pb（II）在γ-Fe_2O_3/TNT上的吸附强烈依赖于pH值，高pH值有利于吸附。γ-Fe_2O_3/TNTs的超顺磁性使其易于从水相中磁分离。吸附Pb（II）的γ-Fe 2 O3/TNT复合材料在回收过程中能有效地脱附并保持良好的稳定性。(C)2015爱思唯尔有限公司版权所有。
Magnetic gamma-Fe2O3/titanate nanotubes (TNTs) composites were prepared and characterized by N-2 adsorption/desorption, VSM, TEM, XRD and zeta potential analysis. The adsorption properties of gamma-Fe2O3/TNTs towards Pb(II) were examined in this paper. Pb(II) could be adsorbed onto the surface of gamma-Fe2O3/TNTs via electrostatic attraction and ion-exchange between Pb(II) and H+/Na+. The kinetics of the Pb(II) adsorption process on gamma-Fe2O3/TNTs followed the pseudo-second-order kinetic model. The adsorption isotherm fitted Langmuir model well. Thermodynamic results indicated that the adsorption amounts of Pb(II) on gamma-Fe2O3/TNTs increased with the elevation of temperature and the adsorption process was spontaneous and endothermic in nature. Pb(II) adsorption on gamma-Fe2O3/TNTs was strongly dependent on pH and high pH favored the adsorption. The superparamagnetism of gamma-Fe2O3/TNTs made the composites easily to be magnetic separated from the aqueous phase. The Pb(II)-adsorbed gamma-Fe2O3/TNTs composites could be effectively desorbed and maintained excellent stability in the recycling process. (C) 2015 Elsevier Ltd. All rights reserved.