【摘 要】
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EAB zeolite was successfully prepared and applied to selective adsorption of Li+,Na+ and K+ ions.The physical and chemical properties of the adsorbent were char
【机 构】
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National Engineering Laboratory for Methanol to Olefins, Dalian National Laboratory for Clean Energy
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EAB zeolite was successfully prepared and applied to selective adsorption of Li+,Na+ and K+ ions.The physical and chemical properties of the adsorbent were characterized by X-ray diffraction (XRD),X-ray fluorescence (XRF),scanning electron microscope (SEM) and thermogravimetry (TG) methods.The ion exchange behaviours for Li+,Na+ and K+ ions in monomcomponent and multicomponent solutions were studied.In independent ion exchange,the ion exchange capacities ratios α(Na/Li) and α(K/Li) were 3.8 and 6.2,respectively.In competitive ion exchange,the selectivities β(Na/Li) and β(K/Li) increased with the initial concentrations and reached 409 and 992 when the initial concentrations was 100 mmol/L.The thermodynamic study results showed that Gibbs free energy change (AG(Ξ)) of ion exchange reaction between Li-EAB and K+ was-34.96 kJ/mol,indicating that ion exchange of K+ ions was more energetically favourable than Li+ ions.The calculation results showed that the energy barriers of ion exchange increased in the order K+ ＜ Na+ ＜ Li+.The study shows that EAB zeolite is potential to be used in the separation of alkali ions.
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