氨基丙二醇功能化硼螯合树脂的制备及其硼酸吸附性能

分别用3-氨基-1，2-丙二醇（3-APD）和2-氨基-1，3-丙二醇（2-APD）对多孔氯甲基聚苯乙烯树脂（CMPS）进行修饰，制备得到含邻、间位二羟基官能团的硼螯合树脂：PS-3-APD和PS-2-APD。用傅里叶红外光谱仪（FTIR）、元素分析仪（EA）、压汞仪（MIP）和激光粒度仪（LPS）对材料进行表征，确认功能单体成功接枝于氯球上。对两种树脂进行了静态提硼性能研究，分别考察了原料液pH、初始硼酸浓度、外来金属离子对硼酸吸附量的影响，当溶液pH为9.15～9.20时，两种树脂对硼酸吸附量最大；溶液中Na⁺、Mg²⁺、Ca²⁺的存在会一定程度削弱树脂对硼酸吸附性能。吸附动力学表明其吸附速率较快，且均满足准二级动力学模型。与Freundlich相比，吸附等温线更符合Langmuir模型，拟合得到的理论最大吸附量分别为0.730mmol/g和0.868mmol/g。本文对未来新型硼螯合树脂的开发及工业化应用提供参考和指导。

Preparation of amino propanediol functionalized boron-chelating resins and application in adsorption of boric acid

Two boron-chelating resins containing aliphatic 1,2-diols and 1,3-diols were prepared from porous chloromethyl polystyrene(CMPS)functionalized by 3-amino-1,2-propanediol(3-APD) and 2-amino-1,3-propanediol(2-APD),respectively. The newly synthesized resins were characterized by FTIR,EA,MIP and LPS. The FTIR spectra showed that the functional monomers were successfully grafted onto the polymer matrix. The effect of pH of boron solution,initial boric acid concentration,and foreign ions on the boron adsorption on the synthesized sorbents were studied in batch model. The maximum boron capacities of PS-3-APD and PS-2-APD could be obtained when the pH of boron solution was in the range of 9.15-9.20. Besides,the presence of foreign ions such as Na⁺,Mg²⁺,Ca²⁺ would deteriorate the adsorption performance due to the competitive adsorption. Kinetic studies showed that both resins adsorbed boric acid from aqueous solutions very quickly and their kinetic curves could be fitted well with pseudo second order model. Boron adsorption isotherms on both resins were better correlated with Langmuir model than with Freundlich model. The calculated maximum boron capacities of PS-3-APD and PS-2-APD by Langmuir equation were 0.730mmol/g and 0.868mmol/g,respectively. This study may offer helpful guidance in the development of novel high-performance boron adsorbents.