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Desalination and Water Treatment Volume 52, 2014 - Issue 40-42
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Articles

Extraction of Pb(II) from water samples by ionic liquid-modified silica sorbents

Sarah SaleemDepartment of Chemistry, COSMATS Institute of Information Technology, Abbottabad22060, Pakistan, Tel. +92 992 383591; Fax: +92 992 383441Correspondence[email protected]
,
Ahmad Nauman Shah SaqibDepartment of Chemistry, COSMATS Institute of Information Technology, Abbottabad22060, Pakistan, Tel. +92 992 383591; Fax: +92 992 383441Correspondence[email protected]
,
Adnan MujahidInstitute of Chemistry, University of the Punjab, Lahore54590, Pakistan, Tel. +92 42 99230463; Fax: +92 42 99230998Correspondence[email protected]
,
Muhammad HanifDepartment of Chemistry, COSMATS Institute of Information Technology, Abbottabad22060, Pakistan, Tel. +92 992 383591; Fax: +92 992 383441Correspondence[email protected]
,
Ghulam MustafaDepartment of Environmental Sciences, Quaid-i-Azam University, Islamabad45320, Pakistan, Tel. +92 51 90644138Correspondence[email protected]
,
Tariq MahmoodDepartment of Chemistry, COSMATS Institute of Information Technology, Abbottabad22060, Pakistan, Tel. +92 992 383591; Fax: +92 992 383441Correspondence[email protected]
,
Amir WaseemDepartment of Chemistry, Quaid-i-Azam University, Islambad45320, Pakistan, Tel. +92 051 90642039Correspondence[email protected]
&
Abdur Rahman KhanDepartment of Chemistry, COSMATS Institute of Information Technology, Abbottabad22060, Pakistan, Tel. +92 992 383591; Fax: +92 992 383441Correspondence[email protected]
 show all
Pages 7915-7924 | Received 25 Sep 2013, Accepted 05 May 2014, Published online: 04 Jun 2014
 
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Abstract

Removal of toxic heavy metals from water matrices is an important challenge in water pollution. In this study, a solid-phase extraction method based on physical adsorption is reported for the removal of Pb(II). Two modified silica sorbents were developed by direct immobilization of 1-butyl-3-methylimidazolium bis(trifluoromethylsulfonyl) imide (C4) and 1-hexyl-3-methylimidazolium bis(trifluoromethylsulfonyl) imide (C6), respectively, on silica surface. Surface modification and characterization of adsorbents were confirmed by FTIR and SEM. Both the sorbents showed enhanced sorption capacity for Pb(II), however, sorbent loaded with 1-butyl-3-methylimidazolium bis(trifluoromethylsulfonyl) imide showed relatively increased removal efficiency when compared to silica loaded with 1-hexyl-3-methylimidazolium bis(trifluoromethylsulfonyl) imide. Batch studies were performed to optimize different variables that influence adsorption process i.e. effect of sorbent dosage, pH, time of contact, sorbate concentration, and temperature. Langmuir, Freundlich, and Temkin isotherms were applied to study adsorption phenomenon.

Acknowledgment

We thank the Higher Education Commission of Pakistan for startup research grants (A.M. and M.H.).

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