Interactions of ammonium-smectite with volatile organic compounds from leachates. (2nd January 2018)

• Record Type: Journal Article
• Authors: Gautier, Mathieu; Muller, Fabrice; Forestier, Lydie Le
• Is Part Of: Clay minerals. Volume 52:Number 1(2017)
• Page Start: 143
• Page End: 159
• Publication Date: 2018-01-02
• Subjects: NH4+, -- aniline, -- clay barrier, -- montmorillonite, -- short-chain, -- sorption, -- volatile organic compounds, -- waste landfill, -- FTIR; Clay minerals -- Periodicals; Clay -- Periodicals; 549.6
• DOI: 10.1180/claymin.2017.052.1.10
• Languages: English
• ISSNs: 0009-8558

Abstract

Abstract: The percolation of water through waste landfills produces leachates with high concentrations of which can generate -exchanged clays within geochemical barriers. These leachates also contain several volatile organic compounds (VOCs) which can interact with the clay barrier. The aim of the present study was to characterize the sorption of eight short-chain VOCs (acetonitrile, methyl tert-butyl ether, dichloromethane, benzene, phenol, ethanol, acetone and aniline) on -smectite, and to identify their sorption mechanisms. The samples treated were characterized by carbon and nitrogen elemental analysis, infrared spectroscopy, powder X-ray diffraction, and thermogravimetric analysis. For acetonitrile, methyl tert-butyl ether, dichloromethane and benzene, no sorption was detected. Phenol, ethanol and acetone were sorbed very weakly, through Van der Waals interactions. Aniline molecules were sorbed strongly on -smectite mainly with hydrogen bonds between aniline and interlayer water molecules. However, aniline sorption decreased the hydrophilic character of the -smectite, which may increase the permeability of the clay barrier.