以改性松香(马来松香乙二醇丙烯酸酯,EGMRA)和丙烯酰胺(AM)为聚合单体,采用悬浮聚合法合成了改性松香-丙烯酰胺二元共聚物。采用静态法研究了该聚合物对青蒿素吸附过程的热力学和动力学特性,对吸附过程进行控制机理判断。结果表明,该共聚物对青蒿素具有良好的吸附能力,最佳吸附条件为:以体积分数为60%的乙醇为溶剂配制青蒿素溶液,质量浓度为4.0 mg/mL,聚合物为20~40目,吸附温度50℃,振荡频率110 rpm,平衡吸附时间为5 h,饱和吸附量Qe=39.78 mg/g。聚合物等温吸附青蒿素的平衡吸附数据符合Langmiur方程,属单分子层吸附。吸附等温线与Langmiur方程高度相关,相关系数R2〉0.99。拟一级吸附动力学模型可较好的描述吸附过程,膜扩散为此吸附体系控制步骤,通过菲克定律计算出膜扩散系数D=6.55×10-9cm2/s。
The copolymer was synthesized with modified rosin (ethylene glycol maleic resinate acrylate, EGMRA) and aerylamide (AM) as the polymerization monomers by using suspension polymerization. The thermodynamic and kinetic characteristics of the copelymer for artemisinin were studied under static conditions. The control mechanism of the ad- sorption process was also investigated. The experimental results showed that the copelymer possessed excellent adsorption performance for artemisinin. The optimal static adsorption conditions were :4.0 mg/mL of artemisinin (mass concentra- tion) in 60% alcohol solution (volume fraction) was adsorbed by 20-40 mesh eopelymer at 50 ~C with oscillating at 110 rpm. The equilibrium adsorption time and the saturation adsorption capacity were 5 h and 39.78 mg/g dried eopelymer, respectively. The equilibrium adsorption data can be well fitted to the Langmuir equation, the eorrealafion coefficient was higher than 0.99. The pseudo first-order equation can describe the adsorption process well. Film diffusion was the key step in this adsorption system. The diffusion coefficient (D) was calculated using Fiek' s equation from the first portions of the adsorption curves, D = 6.55 × 10 9 cm2/s.