Abstract: A new poly(acrylic acid-acrylic sodium) bentonite composite with the mass ratio of 8 to 2 for bentonite to acrylic acid without neutralization was prepared by aqueous solution polymerization with bentonite as the main raw material, acrylic acid partially neutralized as monomer, and characterized. It is indicated that the monomer was intercalated into the bentonite interlayers and polymerized without damage of the bentonite lamellar structure. The bentomite composite had excellent adsorption and regeneration properties to lead and fluorine ions, its adsorption capacity was significantly superior to calcium bentonite and other modified bentonite reported in literatures. When 0.5 g of the bentonite composite was used to treat 50 mL of Pb2+-containing solution at the concentration of 80 mg/L or F- at 16.104 mg/L, its equilibrium adsorption capacity to Pb2+ and F-, and their removal rate were 6.70 mg/g and 83.69%, and 1.01 mg/g and 62.95%, respectively. The adsorption equilibrium data of Pb2+ and F- on the bentonite composite were consistent with the Langmuir and Freundlich isotherm equations respectively.

Key words: bentonite, poly(acrylic acid-acrylic sodium), lead ion, fluorine ion, adsorption

摘要： 以钙基膨润土为主要原料，部分中和的丙烯酸为聚合单体，采用水溶液聚合法，制备了膨润土与未中和丙烯酸单体的质量比例为8:2的聚丙烯酸-丙烯酸钠钙基复合膨润土，并对其进行表征. 结果表明，单体插层在膨润土层间发生聚合反应，但未破坏钙基膨润土的片层结构. 复合膨润土产品对铅离子和氟离子具有良好的吸附和再生性能，吸附量优于钙基膨润土和文献报道的其他改性膨润土；0.5 g复合膨润土处理50 mL浓度为80 mg/L的Pb2+溶液和16.104 mg/L的F-溶液时，平衡吸附量和去除率分别为6.70 mg/g, 83.69%和1.01 mg/g, 62.95%. 复合膨润土对Pb2+和F-的平衡吸附分别符合Langmuir和Freundlich等温吸附方程.

关键词: 膨润土, 聚丙烯酸-丙烯酸钠, 铅离子, 氟离子, 吸附