胺化超高交联吸附树脂的制备及其吸附热力学

Preparation and adsorption thermodynamics of aminated-hypercrosslinked polymeric adsorbents

超高交联树脂上负载不同的胺基,制备了3种不同质量摩尔浓度的胺基修饰的吸附树脂,研究了其对水体系中苯酚和苯胺的静态吸附行为和热力学性质.结果表明:树脂对苯酚和苯胺的吸附量均随着胺基质量摩尔浓度增加而下降,但树脂对苯胺的吸附量下降更大.回归方程的相关因子都大于0.99,表明Langmuir和Freundlich方程均能较好地描述苯酚和苯胺在3种树脂上的吸附行为,对苯酚的吸附是物理吸附和氢键吸附的共同作用,而对苯胺的吸附以物理作用为主.所有Freundli-ch拟合方程的指数均大于1,对苯酚和苯胺的吸附均为优惠吸附.热力学数据表明:吸附均是放热过程,吸附质在树脂表面的吸附是自发过程.吸附嫡变绝对值随树脂中胺基质量摩尔浓度增加而增加,胺基使吸附质与树脂结合更为紧密.

Three types of aminated-hypercrosslinked polymeric adsorbents were successfully prepared.The static adsorption and thermodynamics of the adsorption for phenol and aniline onto the home-made adsorbents from aqueous solution were investigated.The results show that the adsorption capacities of phenol and aniline are both decreased with the increasing of amido content,while the decreased rate of aniline is bigger than that of phenol.The correlation coefficients are all over 0.99,which shows that both Langmuir and Freundlich models can well illuminate the adsorption process.The adsorption of phenol is pushed by physical and chemical interaction,while the adsorption of aniline is mainly pushed by physical interaction.Indexes of n in Freundlich regression equations are all over 1,which means that the adsorptions for both phenol and aniline are favorable adsorption.Thermodynamics data indicate that the adsorptions of phenol and aniline are exothermic and spontaneous process.The absolute value of adsorption entropy change increases with the increasing of amido content,which means that strong interaction between adsorbate and adsorbent is formed by amido.