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Please use this identifier to cite or link to this item: http://hdl.handle.net/10373/1287

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Title: Methods of using carbon nanotubes as filter media to remove aqueous heavy metals
Authors: Tian, Yuan
Gao, Bin
Morales, Verónica L.
Wu, Lei
Wang, Yu
Munoz-Carpena, Rafael
Cao, Can
Huang, Qingguo
Yang, Liuyan
Affiliation: University of Abertay Dundee. Scottish Informatics, Mathematics, Biology and Statistics Centre
Keywords: Carbon nanotube
Natural sand
Fixed-bed
Heavy metal
Sorption
Filtration
Issue Date: Nov-2012
Publisher: Elsevier
Type: Journal Article
Refereed: peer-reviewed
Rights: Published version (c)Elsevier, available from http://dx.doi.org/10.1016/j.cej.2012.09.015
Citation: Tian, Y., et al. 2012. Methods of using carbon nanotubes as filter media to remove aqueous heavy metals. Chemical Engineering Journal. 210: pp.557-563. Available from http://dx.doi.org/10.1016/j.cej.2012.09.015
Abstract: Although carbon nanotubes (CNTs) are well known to have a strong affinity to various heavy metals in aqueous solution, little research has been dedicated to exploit their use in fixed-bed water treatment systems (e.g., trickling filters). In this work, batch sorption and fixed-bed experiments were conducted to examine the ability of functionalized multi-walled CNTs as filter media to remove two heavy metal ions (Pb2+ and Cu2+) from infiltrating water. Batch sorption experiments confirmed the strong sorption affinity of the CNTs for Pb2+ and Cu2+ in both single and dual metal solution systems. In addition, sonication-promoted dispersion of the CNT particles enhanced their heavy metal sorption capacity by 23.9–32.2%. For column experiments, laboratory-scale fixed-bed columns were packed with CNTs and natural quartz sand by three different packing: layered, mixed, and deposited. While all the three packing methods enhanced the fixed-bed filtering efficiency of Pb2+ and Cu2+ from single and dual metal systems, the CNT-deposited packing method was superior. Although the amount of the CNTs added into the fixed-bed columns was only 0.006% (w/w) of the sand, they significantly improved the fixed-bed’s filtering efficiency of Pb2+ and Cu2+ by 55–75% and 31–57%, respectively. Findings from this study demonstrate that functionalized multi-walled CNTs, together with natural sand, can be used to effectively and safely remove heavy metals from water.
URI: http://hdl.handle.net/10373/1287
ISSN: 1385-8947
Appears in Collections:SIMBIOS Collection
Science Engineering & Technology Collection

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