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以功能化纳米Fe_3O_4粒子和功能化凹凸棒黏土纳米棒晶为交联点形成刚性无机网络骨架,以含羧基活性官能团的丙烯酸为聚合单体,采用“一锅法”反相悬浮工艺制得具有三维网络交联结构的新型软磁性珠状纳米Fe_3O_4/聚丙烯酸/纳米凹凸棒晶三元纳米复合微凝胶,并研究了其机械强度、磁性能及对Pb~(2+)的吸附性能。实验结果表明:以功能化纳米Fe_3O_4粒子和凹凸棒黏土纳米棒晶为交联剂,获得的微凝胶具有优异的机械强度和超顺磁性;在pH为5的100mg/g Pb~(2+)溶液中,复合微凝胶对Pb~(2+)的吸附容量大于43mg/g,吸附的Pb~(2+)在0.3mol/L HCl水溶液中仅需100min即可完全解吸,经5次吸附-解吸循环使用后,吸附容量和解吸率几乎不变,再生使用性很好。
A rigid inorganic network framework was formed by functionalized Fe_3O_4 particles and functionalized attapulgite clay nanorods. The acrylic acid with carboxyl functional groups was used as the monomer for the polymerization. The “one-pot” reverse phase suspension process was used A novel soft magnetic bead-like nano-Fe_3O_4 / polyacrylic acid / nano-attapulgite crystal ternary nanocomposite microgel with three-dimensional network cross-linked structure was obtained and its mechanical strength, magnetic properties and Pb 2+ adsorption properties . The experimental results show that the microgel has excellent mechanical strength and superparamagnetism with functionalized nano-Fe 3 O 4 particles and attapulgite clay nanorod crystal as the cross-linking agent. At pH 5 of 100 mg / g Pb 2+ ), The adsorption capacity of composite microgel to Pb 2+ is more than 43 mg / g, the adsorbed Pb 2+ can be completely desorbed in only 100 min in 0.3 mol / L HCl aqueous solution. After 5 times Adsorption - desorption cycle, the adsorption capacity and desorption rate almost unchanged, good reproducibility.