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以木质素磺酸钙(LS-Ca)、丙烯酸(AA)为原料,乙二醇二甲基丙烯酸酯(EDMA)为交联剂制备了木质素磺酸钙改性丙烯酸复合吸附树脂(LSAA).采用红外光谱、扫描电子显微镜、热重分析、比表面分析和吸附实验对LSAA树脂的性能进行表征.结果显示,LSAA树脂的初始分解温度为291.2℃,具有良好的热稳定性;表面粗糙,介孔丰富,树脂表面有较丰富的羟基等活性基团.LSAA对甲基橙的吸附过程受p H值的影响,298 K,p H=3时,24 h吸附量为188.33 mg/g;Langmuir和Freundlich方程均能较好地拟合甲基橙在LSAA树脂上的吸附等温线,吸附动力学过程符合准二级动力学方程,吸附为以物理吸附为主的放热过程.KannanSundaram模型拟合说明,LSAA的吸附过程分为吸附剂表面吸附、孔道缓慢扩散及小孔缓慢扩散3个阶段,直线都不经过原点,内扩散不是控制吸附过程的唯一步骤.
Calcium lignosulfonate-modified acrylic acid composite adsorbent resin (LSAA) was prepared from calcium lignosulfonate (LS-Ca), acrylic acid (AA) and ethylene glycol dimethacrylate (EDMA) The properties of LSAA resin were characterized by FTIR, SEM, TGA, surface area analysis and adsorption experiments.The results showed that the initial decomposition temperature of LSAA resin was 291.2 ℃ with good thermal stability, The mesopores are abundant and the surface of the resin is rich in hydroxyl groups. The adsorption of methyl orange by LSAA is affected by the p H value. When the adsorption amount is 298 K and the adsorption amount is 188.33 mg / g at p H = 3, The Langmuir and Freundlich equations fit the adsorption isotherms of methyl orange on LSAA resin well, the adsorption kinetics follows the pseudo-second-order kinetic equation, and the adsorption is the exothermic process based on physical adsorption. In conclusion, the adsorption process of LSAA is divided into adsorbent surface adsorption, slow propagation of pores and slow diffusion of pores. All the straight lines do not pass through the origin and internal diffusion is not the only step to control the adsorption process.