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以黄腐酸(FA)为功能单体,Ni~(2+)为模板,Fe_3O_4/SiO_2为磁核,成功制备了新型离子印迹磁球(Fe_3O_4/SiO_2/FA)。研究结果表明:当水溶剂总体积为50mL时,其最佳制备工艺条件是:Fe_3O_4/SiO_2为1g,KH-560为1.2mL,FA(0.01g/mL)为30mL,NiCl_2·6H_2O(0.03g/mL)为12mL,反应温度为60℃。在Cr~(3+)和Pb~(2+)竞争离子存在条件下,相对选择性系数Ni~(2+)/Cr3+、Ni~(2+)/Pb~(2+)分别是221.44和609.72,表明Fe_3O_4/SiO_2/FA对Ni~(2+)离子具有较高的选择识别能力;经过5次吸附-脱附实验后,离子印迹磁球仍然具有较好的吸附使用性能。
A novel ion imprinted magnetic sphere (Fe_3O_4 / SiO_2 / FA) was successfully prepared by using fulvic acid (FA) as the functional monomer, Ni 2+ as the template and Fe_3O_4 / SiO_2 as the magnetic core. The results show that when the total volume of water solvent is 50 mL, the optimum preparation conditions are as follows: 1 g Fe_3O_4 / SiO_2, 1.2 mL KH-560, 30 mL FA (0.01 g / mL), 0.03 mL / mL) was 12 mL and the reaction temperature was 60 ° C. The relative selectivity coefficients of Ni 2+ / Cr 3+ and Ni 2+ / Pb 2+ in the presence of Cr 3+ and Pb 2+ ions were 221.44 and 609.72, indicating that Fe 3 O 4 / SiO 2 / FA has high selective recognition ability for Ni 2+ ions. After five adsorption-desorption experiments, the ion-imprinted magnetic ball still has good adsorption performance.