ZSM-5/AC复合材料在固定床台架系统中去除Pb2+离子

IF 2.8 4区 工程技术 Q2 CHEMISTRY, APPLIED
R. Lakshmipathy, G. L. Balaji, I. R. Rico
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引用次数: 6

摘要

该研究表明,ZSM-5活性炭复合材料是一种高效的吸附剂,可连续去除水中的Pb2+离子。通过改变工艺流速(2-6)等三个参数进行连续吸附实验 mL min-1),床高(2-6 cm)和初始浓度(250–750 毫克 L-1)。固定床的最高装载能力213.3 毫克 L-1的最佳值为2 mL 流速的min-1,床高6 cm,初始浓度为750 毫克 L-1。发现穿透曲线和饱和点随着流速和初始浓度的增加而迅速出现,反之亦然。较低的流速和较高的床层深度显示出固定床柱的最佳性能。Pb2+离子的吸附机理是与ZMS-5中的Na+离子进行离子交换,并在活性炭上进行孔吸附。突破曲线用三个著名的数学模型进行了验证,如Adams-Bohart、Thomas和Yoon-Nelson模型。与Adams-Bohart模型相比,后来的模型显示出与柱数据的最佳拟合,该模型可用于理解Pb2+离子与复合材料的结合。ZSM-5/活性炭在0.1 60内的M HCl 最小接触时间。结果表明,ZSM-5活性炭复合材料是一种用于连续去除负载Pb2+离子的水的多产材料。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Removal of Pb2+ Ions by ZSM-5/AC Composite in a Fixed-Bed Bench Scale System
This investigation suggests the implementation of ZSM-5 activated carbon composite as a prolific adsorbent for the continuous elimination of Pb2+ ions from water. Continuous adsorption experiments were performed by varying three parameters such as process flow rate (2-6 mL min-1), bed height (2-6 cm), and initial concentration (250–750 mg L-1). The highest loading capacity of the fixed-bed 213.3 mg L-1 was achieved with optimal values of 2 mL min-1 of flow rate, bed height of 6 cm, and initial concentration of 750 mg L-1, respectively. The breakthrough curves and saturation points were found to appear quickly for increasing flow rates and initial concentration and vice versa for bed depth. The lower flow rates with higher bed depths have exhibited optimal performances of the fixed-bed column. The mechanism of adsorption of Pb2+ ions was found to be ion exchange with Na+ ions from ZMS-5 and pore adsorption onto activated carbon. The breakthrough curves were verified with three well-known mathematical models such as the Adams-Bohart, Thomas, and Yoon-Nelson models. The later models showed the best fit to the column data over the Adams-Bohart model that can be utilized to understand the binding of Pb2+ ions onto the composite. Regeneration of ZSM-5/activated carbon was achieved successfully with 0.1 M HCl within 60 min of contact time. The outcomes conclude that ZSM-5 activated carbon composite is a prolific material for the continuous removal of water loaded with Pb2+ ions.
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来源期刊
Adsorption Science & Technology
Adsorption Science & Technology 工程技术-工程:化工
CiteScore
5.00
自引率
10.30%
发文量
181
审稿时长
4.5 months
期刊介绍: Adsorption Science & Technology is a peer-reviewed, open access journal devoted to studies of adsorption and desorption phenomena, which publishes original research papers and critical review articles, with occasional special issues relating to particular topics and symposia.
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