间氨基酚修饰超高交联吸附树脂的合成及吸附性能

Synthesis and adsorption characteristics of hypercrosslinked polymeric adsorption resin modified by m-aminophenol

合成了间氨基酚修饰超高交联吸附树脂(MMAR)。用红外光谱等进行表征,并用于吸附水溶液中2-氨基吡啶的研究。热力学研究结果表明,Freundlich吸附等温方程能够对静态吸附等温线进行很好的拟合。吸附焓变ΔH<0,其绝对值小于46 KJ.mo-l1,表明以物理吸附为主以及该吸附剂容易脱附的特征;△G<0,说明吸附是自发行为;△S<0,表明吸附质分子在树脂表面上的运动受到了限制。动力学研究结果表明,吸附符合一级动力学方程,吸附速率随着温度的升高而增大,颗粒内扩散是速率控制步骤之一。表观活化能Ea<10 KJ.mo-l1,说明吸附较容易进行。

A new hypercrosslinked polymeric adsorption resin modified by m-Aminophenol（MMAR） is prepared.The structure of resin was characterized by FT-IR,the adsorption behaviors of 2-Aminopyridine in aqueous solution,including the static equilibrium adsorption and dynamic have been studied.Equilibrium data for 2-Aminopyridine the adsorption of from aqueous solutions by MMAR,Adsorption data were modeled using the Freundlich adsorption isotherm,but it do not fit well into the Langmuir equations.The ΔH absolute value was in less than 46 KJ·mol-1.The adsorption was an indicative of physical adsorption character and an easier desorption property.The negative value of ΔG indicates the spontaneous nature of the adsorption process,and the negative value of ΔS shows the 2-Aminopyridine molecule movement was fall under restrict at the solid interface.Kinetic results showed that on the adsorption behaviors of 2-Aminopyridine on MMAR resin in line with the first-order kinetic equation,the adsorption rate with increasing temperature.The adsorption rate mainly control was intra-particle diffusion.Ea10 KJ·mol-1,indicates an easier adsorption property.