【摘 要】
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The sorption properties of amino methylene phosphonic resin(APAR) for Ag(Ⅰ) were studied. The amino methylene phosphonic acid resin(APAR) has a good adsorption
【机 构】
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Department of Chemistry,College of Food Science
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The sorption properties of amino methylene phosphonic resin(APAR) for Ag(Ⅰ) were studied. The amino methylene phosphonic acid resin(APAR) has a good adsorption ability for Ag(Ⅰ) at pH=6.0 in the NAc-NaAc medium. The statically saturated adsorption capacity is 272 mg/g resin, Ag(Ⅰ) adsorbed on APAR can be eluted by 5% (NH2)2CS-0.5 mol/L hydrochloric acid quantitatively. The adsorption rate constants determined under various temperatures are k15℃=3.89× 10-5 s-1, k25℃=5.93 × 10-5 s-1,k35℃=7.59 × 10-5 s-1, k45℃=9.45 × 10-5 s-1, respectively. The apparent activation energy of adsorption, Ea is 22.8 kJ/mol, the enthalpy change (ΔH) of sorption is 17.4 kJ/mol. The adsorption mechanism shows that the functional group of APAR coordinates with Ag(Ⅰ)to form coordination bond, the coordination molar ratio of the functional group of APAR to Ag(Ⅰ) is 1: 1.
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