Adsorption of two antibiotics and bisphenol A on Dianchi peat
GAO Peng1, NIU Yi-fan2, REN Xin2, YANG Dong2, PENG Hong-bo2
1. Faculty of Environmental Science & Engineering, Kunming University of Science & Technology, Kunming 650500, China;
2. Faculty of Agriculture and Food, Kunming University of Science & Technology, Kunming 650500, China
The Dianchi peat soil was collected from Dianchi Lake in Kunming, Yunnan, China. The peat soil was treated by different concentrations of NaOH solutions, and effect of alkali solution for the properties of peat soil and the sorption characteristics of contaminants was evaluated. Adsorption mechanisms of two antibiotics, sulfamethoxazole (SMX), carbamazepine (CBZ), and bisphenol A (BPA) on peat soils before/after NaOH treated were discussed. Effects of the properties for contaminants as well as the peat soils on their sorption characteristics were investigated. Adsorption isotherms for SMX, CBZ and BPA were well fitted by the Freundlich model, and the fitting results showed that the Freundlich nonlinearity factor n values of BPA were the lowest among these three contaminants, which may be due to its asymmetric structural characteristics. As the concentration of NaOH increased, adsorption of these three contaminants on peat soils was BPA > CBZ > SMX. BPA has two phenolic hydroxyl groups and thus it could interact with peat soils by polar interaction, this may result in the highest sorption of it on peat soils. Adsorption of CBZ was higher than that of SMX was due to the hydrophobic interactions between CBZ/SMX and peat soils. Adsorption of SMX, CBZ and BPA on peat soils treated by NaOH solutions was not increased, this suggested that the sorption processes and mechanisms of ionic compounds on peat soils were complex, many factors such as functional groups and solubility of contaminants, the contents of organic carbon and functional groups of peat soils affected the sorption. The butterfly structure and two hydroxyl groups of BPA may lead to its specific adsorption on peat soil, which resulted in the highest adsorption coefficient. The organic carbon content of peat soil increased but the specific surface area may decrease after NaOH treated, and thus reducing the adsorption of these three contaminants. Therefore, adsorption of these three ionic compounds on the peat soils was affected by various factors, including the functional groups and solubility of adsorbates, the organic carbon content and functional groups of peat soils in this study.
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