Abstract
The present study aims to investigate the co-sorption characteristic of Sulfamethoxazole (SMX) and Cu(II) onto two typical soils with different properties in China. The sorption of SMX and Cu(II) onto soil is carried out by batch method. The results indicated that Cu(II) co-presence significantly increased SMX adsorption on Black soils, but decreased SMX adsorption on Brown soils. The further kinetic models fitting found, however, that Cu(II) co-presence had little effect on the sorption process of SMX onto soils. The co-sorption of SMX and Cu(II) on soil mineral surface was confirmed by the X-ray photoelectron spectroscopy and Energy Spectrum Analysis based on the variation of elemental bonding energy after adsorption. The further Infrared Spectrometric Analysis proved that SMX and Cu(II) were bonded on soil mineral surface by coordination of Cu(II) with the N reactive groups of SMX. Finally, in view of the different sorption of SMX on Brown and Black soils after Cu(II) addition, it could conclude that the coordination is not favourable to SMX adsorption onto soil mineral phases.
Published Version
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