Synthesis of a novel magnetic zeolite nanocomposite for removal of Cs+ and Sr2+ from aqueous solution: Kinetic, equilibrium, and thermodynamic studies
Synthesis of a novel magnetic zeolite nanocomposite for removal of Cs+ and Sr2+ from aqueous solution: Kinetic, equilibrium, and thermodynamic studies
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DOI：
10.1016/j.jcis.2012.11.010
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发表时间：
2013-03-01
影响因子：
9.9
通讯作者：
Iravani, Mozhgan
中科院分区：
文献类型：
--
作者：
Faghihian, Hossein;Moayed, Mohammad;Iravani, Mozhgan
在这项研究中，由纳米沸石A和氧化铁制备了一种新型磁性沸石纳米复合材料（MZNC）。合成了纳米晶沸石A，然后在纳米沸石存在下制备了氧化铁纳米晶体。通过 XRD、XRF、FT-IR、DTG、VSM 和 TEM 方法对制备的纳米复合材料进行了表征。评估了合成的纳米复合材料去除水溶液中Cs+和Sr2+的适用性，并对初始浓度、初始pH、接触时间和温度等吸附过程的有效参数进行了研究和优化。该复合材料能够从 0.01 N 水溶液中分别去除 95.2% 和 81.4% 的 Sr+2 和 Cs+1。动力学研究表明该过程相当快，30分钟内达到90%的平衡容量。实验动力学数据与Cs+和Sr2+速率常数分别为0.2845和0.2722 g mmol(-1) min(-1)的准二级动力学模型吻合。 Langmuir、Freundlich 和 D-R 等温线模型用于描述平衡数据。测得纳米复合材料的饱和磁化强度为19.50 emu g(-1)，有利于吸附过程后样品的磁分离。 (C) 2012 Elsevier Inc. 保留所有权利。
In this study, a novel magnetic zeolite nanocomposite (MZNC) Was prepared by nanozeolite A and iron oxide. Nanocrystalline zeolite A was synthesized, and then, iron oxide nanocrystals were prepared in the presence of nanozeolite. The prepared nanocomposite was characterized by XRD, XRF, FT-IR, DTG, VSM, and TEM methods. The applicability of the synthesized nanocomposite for removal of Cs+ and Sr2+ from aqueous solutions was assessed, and the effective parameters such as initial concentration, initial pH, contact time, and temperature on the sorption process were studied and optimized. The composite was able to remove 95.2% and 81.4% of Sr+2 and Cs+1 from 0.01 N aqueous solutions, respectively. The kinetic studies showed that the process was quite rapid, and 90% of equilibrium capacity was achieved within 30 min. Experimental kinetic data were found to be well fitted with pseudo-second-order kinetic model with rate constant of 0.2845 and 0.2722 g mmol(-1) min(-1) for Cs+ and Sr2+, respectively. The Langmuir, Freundlich, and D-R isotherm models were used to describe the equilibrium data. The saturation magnetization of nanocomposite was measured as 19.50 emu g(-1), which facilitated magnetic separation of the sample after adsorption process. (C) 2012 Elsevier Inc. All rights reserved.