一种后交联大孔吸附树脂的合成及其对苯酚和维生素B12吸附性能研究

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工业二乙烯苯悬浮聚合制备的大孔树脂,在二氯乙烷溶剂中以无水三氯化铁为催化剂进行悬挂双键后交联反应,得到的后交联树脂的比表面积和孔容都有显著增加.低温氮气吸附/脱附等温线得到的孔径分布曲线证明初始共聚物PDT-55(polydivinylbenzene,toluene as porogen)和PDH-55(polydivinylbenzene,heptane andtoluene as porogen)经后交联反应,所形成的新孔以微孔为主.树脂对水溶液中苯酚和维生素B12(VB12)的静态吸附研究发现树脂经后交联后,对苯酚的吸附量有显著提高,但对VB12的吸附量增加不大,原因是分子尺寸较大的VB12无法进入由悬挂双键后交联反应所形成的微孔.树脂PDT-55pc对苯酚的吸附量大于商品树脂XAD-4;后交联前后树脂PDT-55、PDT-55pc(post-crosslinking of PDT-55)、PDH-55、PDH-55pc(post-crosslinking ofPDH-55)对VB12的吸附量均大于树脂XAD-4.在本研究的实验条件下,Langmiur和Freundlich吸附等温线方程能很好地拟合树脂对水溶液中苯酚和VB12的吸附,相关系数在0.99以上.静态吸附动力学实验结果表明后交联前后树脂对苯酚的吸附较VB12更容易达到吸附平衡.吸附动力学数据的拟合结果显示,McKay二级吸附动力学模型符合树脂对苯酚的吸附,而对VB12的吸附更符合Lagergren一级吸附动力学模型. The macroporous resin prepared by suspension polymerization of industrial divinylbenzene is crosslinked by double dangling double bonds in the solvent of dichloroethane with anhydrous ferric chloride as catalyst. The specific surface area and pore volume The results of pore size distribution curve of low temperature nitrogen adsorption / desorption isotherms showed that the initial copolymer PDT-55 (polydivinylbenzene, toluene as porogen) and PDH-55 (polydivinylbenzene, heptane andtoluene as porogen) The new pores formed mainly by micropores.The static adsorption of resin to the aqueous solution of phenol and vitamin B12 (VB12) showed that after the resin was crosslinked, the adsorption amount of phenol increased significantly, but the adsorption amount of VB12 increased Because the larger molecular size of VB12 can not enter the micro-pores formed by the cross-linking reaction of dangling double bonds.The adsorption capacity of PDT-55pc resin to phenol is larger than that of commercial resin XAD-4. The post-crosslinking resin PDT-55 , PDT-55pc (post-crosslinking of PDT-55), PDH-55 and PDH-55pc (post-crosslinking of PDH-55) all adsorb VB12 more than resin XAD- 4. Under the experimental conditions of this study, Langmiur And Freundlich adsorption isotherm equations Which can well fit the adsorption of phenol and VB12 in aqueous solution with the correlation coefficient of above 0.99.The results of static adsorption kinetics show that the adsorption of phenol on the resin before and after postcrosslinking can reach the adsorption equilibrium more easily than VB12.The adsorption kinetics data The fitting results show that McKay’s second-order kinetic model is in agreement with the resin adsorption of phenol, while the adsorption of VB12 accords with Lagergren first-order kinetic model.
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