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通过Friedel-Crafts反应和化学修饰反应制备了乙基纤维素修饰的超高交联吸附树脂ECMR,采用傅里叶变换红外光谱和比表面及孔径分析对树脂结构和表面参数进行分析表征。通过静态吸附.脱附、吸附动力学和小柱吸附-脱附实验探讨了ECMR树脂对四环素的吸附行为。结果表明:ECMR树脂的BET比表面积为1083.9m~2/g,微孔面积为885.7 m~2/g。与NDA150相比,ECMR树脂对四环素具有更好的吸附性能,2种树脂对四环素的吸附量均随着温度升高而增加,吸附过程存在着较强的不可逆的化学吸附作用。2种树脂对四环素吸附动力学过程符合准一级方程,颗粒内扩散是吸附过程的主要控制步骤。小柱吸附-脱附结果表明ECMR:树脂对四环素的饱和吸附量较大,Methanol/4%NaOH(V_1/V_2=1/1)的溶液能够很好的使ECMR树脂再生。
The ECCR modified by ethyl cellulose was prepared by Friedel-Crafts reaction and chemical modification reaction. The structure and surface parameters of the resin were characterized by Fourier transform infrared spectroscopy and specific surface area and pore size analysis. The adsorption behavior of tetracycline by ECMR resin was discussed by static adsorption, desorption, adsorption kinetics and column adsorption-desorption experiments. The results showed that the BET specific surface area of ECMR resin was 1083.9m 2 / g and the micropore area was 885.7 m 2 / g. Compared with NDA150, ECMR resin has better adsorption capacity for tetracycline. The adsorption amount of tetracycline for both resins increased with the increase of temperature, and there was a strong irreversible chemisorption in the adsorption process. The adsorption kinetics of tetracycline by two kinds of resins accorded with quasi-first-order equation, and intra-particle diffusion was the main control step of adsorption process. The results of column adsorption-desorption show that ECMR resin adsorbs more saturated tetracycline, and the solution of Methanol / 4% NaOH (V_1 / V_2 = 1/1) can regenerate the ECMR resin well.