Ionic liquid modification of zeolite and its removal of chromate from water

This study focused on using imidazolium of different chain lengths to modify the negatively charged zeolite. The modification involves a cation exchange process of the organic cations of ionic liquids (ILs) for the alkali and alkaline earth elements on zeolite surfaces. X-ray diffraction analyses revealed that the uptake of ILs was on the external surfaces. Fourier transform infrared analyses showed that different mechanisms were attributed to IL uptake on zeolite at below and above the external cation exchange capacity. After modification, the zeolite reversed its surface charge to positive, thus enhancing adsorptive removal of anionic contaminants such as chromate from water. At the same time, the modified zeolite increased their total organic carbon content, and thus could promote better adsorptive removal of hydrophobic organic contaminants from water, too. These features enable IL-modified zeolite to be used as inexpensive sorbents for the removal of multi-types of contaminants from water simultaneously.

[1]  Guocheng Lv,et al.  Modification of a Ca-montmorillonite with ionic liquids and its application for chromate removal. , 2014, Journal of hazardous materials.

[2]  Juan Li,et al.  Adsorption and desorption characteristics of imidazole-modified silica for chromium(VI) , 2013 .

[3]  K. Hayakawa,et al.  Characterization and Functionality of Immidazolium Ionic Liquids Modified Magnetic Nanoparticles , 2013 .

[4]  M. Riekkola,et al.  Ionic liquid-modified materials for solid-phase extraction and separation: a review. , 2012, Analytica chimica acta.

[5]  M. Xanthos,et al.  Sequential modification of cationic and anionic nanoclays with ionic liquids , 2011 .

[6]  A Klamt,et al.  Predicting the critical micelle concentrations of aqueous solutions of ionic liquids and other ionic surfactants. , 2009, Chemistry.

[7]  Mi-Kyung Lee,et al.  Imidazolium derivatives functionalized MCM-41 for catalytic conversion of carbon dioxide to cyclic carbonate , 2009 .

[8]  H. Hong,et al.  An FTIR investigation of hexadecyltrimethylammonium intercalation into rectorite. , 2008, Spectrochimica acta. Part A, Molecular and biomolecular spectroscopy.

[9]  P. Urbaszek,et al.  Determination of the adsorption mechanism of imidazolium-type ionic liquids onto kaolinite: implications for their fate and transport in the soil environment , 2008 .

[10]  H. Abdollahi,et al.  Interaction of anionic dyes and cationic surfactants with ionic liquid character. , 2008, Journal of colloid and interface science.

[11]  B. Buszewski,et al.  Study of sorption kinetics of some ionic liquids on different soil types. , 2008, Chemosphere.

[12]  J. Fernández,et al.  Micelle formation of imidazolium ionic liquids in aqueous solution , 2008 .

[13]  P. Stepnowski,et al.  Adsorption of alkylimidazolium and alkylpyridinium ionic liquids onto natural soils. , 2007, Environmental science & technology.

[14]  C. Detellier,et al.  Reactivity of kaolinite in ionic liquids: preparation and characterization of a 1-ethyl pyridinium chloride–kaolinite intercalate , 2005 .

[15]  D. Gorman-Lewis,et al.  Experimental study of the adsorption of an ionic liquid onto bacterial and mineral surfaces. , 2004, Environmental science & technology.

[16]  Robin D. Rogers,et al.  Ionic liquids : industrial applications for green chemistry , 2002 .

[17]  Z. Li.  Oxyanion sorption and surface anion exchange by surfactant-modified clay minerals , 1999 .

[18]  R. Bowman,et al.  Counterion Effects on the Sorption of Cationic Surfactant and Chromate on Natural Clinoptilolite , 1997 .

[19]  R. Bowman,et al.  Topological and Thermal Properties of Surfactant-Modified Clinoptilolite Studied by Tapping-Mode® Atomic Force Microscopy and High-Resolution Thermogravimetric Analysis , 1997 .

[20]  J. Hupka,et al.  Changes in zeta potential of imidazolium ionic liquids modified minerals--Implications for determining mechanism of adsorption. , 2013, Chemosphere.

[21]  J. Filser,et al.  Sorption and desorption of imidazolium based ionic liquids in different soil types. , 2009, Chemosphere.

[22]  M. Arai,et al.  Synthesis and adsorption properties of smectite-like materials prepared using ionic liquids , 2009 .

[23]  M. Zha,et al.  Effects of montmorillonite interlayer micro-circumstance on the PP melting intercalation , 2008 .

[24]  Guangxue Zhang,et al.  Effect of Hydrophobic Carbon Chain Length on the Crystal Structure of MCM-41 , 2008 .

[25]  J. Beaulieu,et al.  Sorption of imidazolium-based ionic liquids to aquatic sediments. , 2008, Chemosphere.

[26]  R. Bowman,et al.  Regeneration of surfactant-modified zeolite after saturation with chromate and perchloroethylene. , 2001, Water research.