Methods of using carbon nanotubes as filter media to remove aqueous heavy metals

Yuan Tian, Bin Gao, Veronica L. Morales, Lei Wu, Yu Wang, Rafael Munoz-Carpena, Can Cao, Qingguo Huang, Liuyan Yang

Research output: Contribution to journalArticle

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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.
Original languageEnglish
Pages (from-to)557-563
Number of pages7
JournalChemical Engineering Journal
Volume210
DOIs
StatePublished - Nov 2012

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heavy metal
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Tian, Y., Gao, B., Morales, V. L., Wu, L., Wang, Y., Munoz-Carpena, R., ... Yang, L. (2012). Methods of using carbon nanotubes as filter media to remove aqueous heavy metals. Chemical Engineering Journal, 210, 557-563. DOI: 10.1016/j.cej.2012.09.015

Tian, Yuan; Gao, Bin; Morales, Veronica L.; Wu, Lei; Wang, Yu; Munoz-Carpena, Rafael; Cao, Can; Huang, Qingguo; Yang, Liuyan / Methods of using carbon nanotubes as filter media to remove aqueous heavy metals.

In: Chemical Engineering Journal, Vol. 210, 11.2012, p. 557-563.

Research output: Contribution to journalArticle

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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.",
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Tian, Y, Gao, B, Morales, VL, Wu, L, Wang, Y, Munoz-Carpena, R, Cao, C, Huang, Q & Yang, L 2012, 'Methods of using carbon nanotubes as filter media to remove aqueous heavy metals' Chemical Engineering Journal, vol 210, pp. 557-563. DOI: 10.1016/j.cej.2012.09.015

Methods of using carbon nanotubes as filter media to remove aqueous heavy metals. / Tian, Yuan; Gao, Bin; Morales, Veronica L.; Wu, Lei; Wang, Yu; Munoz-Carpena, Rafael; Cao, Can; Huang, Qingguo; Yang, Liuyan.

In: Chemical Engineering Journal, Vol. 210, 11.2012, p. 557-563.

Research output: Contribution to journalArticle

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T1 - Methods of using carbon nanotubes as filter media to remove aqueous heavy metals

AU - Tian,Yuan

AU - Gao,Bin

AU - Morales,Veronica L.

AU - Wu,Lei

AU - Wang,Yu

AU - Munoz-Carpena,Rafael

AU - Cao,Can

AU - Huang,Qingguo

AU - Yang,Liuyan

PY - 2012/11

Y1 - 2012/11

N2 - 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.

AB - 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.

U2 - 10.1016/j.cej.2012.09.015

DO - 10.1016/j.cej.2012.09.015

M3 - Article

VL - 210

SP - 557

EP - 563

JO - Chemical Engineering Journal

T2 - Chemical Engineering Journal

JF - Chemical Engineering Journal

SN - 1385-8947

ER -

Tian Y, Gao B, Morales VL, Wu L, Wang Y, Munoz-Carpena R et al. Methods of using carbon nanotubes as filter media to remove aqueous heavy metals. Chemical Engineering Journal. 2012 Nov;210:557-563. Available from, DOI: 10.1016/j.cej.2012.09.015