Experimental results indicated that the resin of 4-aminopyridine (4-APR) showed good ability to adsorb Mo(Ⅵ) at pH=4.1 in the HAc-NaAc medium.The statically saturated sorption capacity was 594 mg Mo(Ⅵ)·(...Experimental results indicated that the resin of 4-aminopyridine (4-APR) showed good ability to adsorb Mo(Ⅵ) at pH=4.1 in the HAc-NaAc medium.The statically saturated sorption capacity was 594 mg Mo(Ⅵ)·(g resin)-1,Mo(Ⅵ) adsorbed on 4-APR could be eluted by 3 mol·L-1 HCl or 3 mol·L-1 NaOH quantitatively. The sorption rate constants determined at various temperatures were respectively k15℃=2.24×10-5 s-1,k25℃=3.30×10-5 s-1,k35℃=4.79×10-5 s-1,and k45℃=6.85×10-5 s-1.The sorption apparent activation energy Ea was 29.1 kJ·mol-1.The sorption mechanism showed that the nitrogen atoms of the functional group of 4-APR coordinated with Mo(Ⅵ) to form coordination bonds,and the coordination molar ratio of [4-AP] to Mo(Ⅵ) was 1∶2.展开更多
文摘Experimental results indicated that the resin of 4-aminopyridine (4-APR) showed good ability to adsorb Mo(Ⅵ) at pH=4.1 in the HAc-NaAc medium.The statically saturated sorption capacity was 594 mg Mo(Ⅵ)·(g resin)-1,Mo(Ⅵ) adsorbed on 4-APR could be eluted by 3 mol·L-1 HCl or 3 mol·L-1 NaOH quantitatively. The sorption rate constants determined at various temperatures were respectively k15℃=2.24×10-5 s-1,k25℃=3.30×10-5 s-1,k35℃=4.79×10-5 s-1,and k45℃=6.85×10-5 s-1.The sorption apparent activation energy Ea was 29.1 kJ·mol-1.The sorption mechanism showed that the nitrogen atoms of the functional group of 4-APR coordinated with Mo(Ⅵ) to form coordination bonds,and the coordination molar ratio of [4-AP] to Mo(Ⅵ) was 1∶2.