Abstract:

Using corn starch(St) and zwitterionic monomer(ZM) as main raw materials, zwitterionic graft copolymerized starch(ZS) was prepared through solution polymerization and chemical cross-linking method. The product was characterized by FTIR, TGA-DSC, XRD and SEM-EDS. Static adsorption effects of the product on Cu²⁺ was evaluated. The results showed that St changed from crystal to amorphous structure. The product had good thermal stability under 270℃. Saturated adsorption amount of Cu²⁺ was 63 mg/g. The adsorption process conformed to pseudo-second-order kinetic model and Freundlich isotherm adsorption model. The product had good adsorption performance and it did not precipitate in high concentration Cu²⁺ solution.

Key words: zwitterionic polymer, starch, adsorbent, copper ions, anti polyelectrolyte effect

摘要：

以玉米淀粉（St）和两性离子单体（ZM）为主要原料，通过溶液聚合和化学交联制备了两性离子接枝共聚淀粉（ZS）。使用FTIR、TGA-DSC、XRD、SEM-EDS对产物进行了表征，评价了产物对Cu²⁺的静态吸附效果。结果表明：St从结晶态转变为无定型态，产物在270℃以下热稳定性良好，对Cu²⁺的最大吸附量为63 mg/g，吸附过程符合准二级动力学模型和Freundlich等温模型。产物在高浓度Cu²⁺溶液中不聚沉，吸附性能良好。

关键词: 两性离子聚合物, 淀粉, 吸附剂, 铜离子, 反聚电解质效应

CLC Number: 

• X703.5

• TQ424