Abstract
This study mainly focused on the adsorption of 2-methylisoborneol (2-MIB) and geosmin (GSM) form water onto a new type of adsorbent (attapulgite) (ATP) and thermally modified attapulgite (T-ATP). The adsorption isotherm and the adsorption kinetics of GSM onto T-ATP were studied in batch experiments. Meanwhile, the effect of temperature and pH on the removal efficiency and the absorbed amount of GSM and 2-MIB was also investigated. Experimental results show that the optimal concentrations of adsorption of GSM and 2-MIB onto ATP and T-ATP were both 1 g/L. The adsorption of GSM onto T-ATP better followed pseudo-second-order model. Freundlich isotherm fit the experimental data (the adsorption of GSM onto T-ATP) better than Langmuir isotherm. Besides, the best operational condition of adsorption of GSM and 2-MIB onto ATP and T-ATP was at lower temperature (5°C) and under neutral pH (6.5 ∼ 7.5). Although the adsorption of GSM onto T-ATP was nonspontaneous, it was an exothermic reaction, in terms of the thermodynamic parameters (positive of ΔG° and negative of ΔH° and ΔS°). The weak adsorption reaction could take place by simply raising shaking speeds.
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