【摘要】 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.更多还原

【Abstract】 A post-crosslinked polymeric adsorbent was prepared by Friedel-Crafts reaction of the pendant vinyl groups.It was obvious that both the specific surface area and the pore volume of starting copolymers increased significantly after post-crosslinking.Nitrogen adsorption/desorption isotherms and pore size distribution curves revealed that the new pores of the resulted copolymers formed by post-crosslinking reaction were mainly micropores.The results of static adsorption indicated that the adsorbents sorption capability of phenol had been greatly improved after post-crosslinked,while this phenomenon was not obvious to VB₁₂.It could be attributed to the molecular size of VB₁₂,which prevented VB₁₂ diffusing from solution phase into the micropore region formed by postcrosslinking.PDT-55pc exhibited higher adsorption capacity of phenol than the commercial macroporous resin XAD-4.The adsorption capacity of VB₁₂ onto adsorbent PDT-55（polydivinylbenzene,toluene as porogen）,PDT-55pc（post-crosslinking of PDT-55）,PDH-55（polydivinylbenzene,heptane and toluene as porogen）,PDH-55pc（post-crosslinking of PDH-55） was larger than that onto XAD-4.The equilibrium adsorption curves for resins adsorbed phenol and VB₁₂ showed good agreement with the Langmuir and Freundlich isotherm equations.Correlation coefficients were larger than 0.99.Adsorption kinetic curves indicated that the time for adsorption equilibrium of phenol was shorter than that of VB₁₂.The kinetic data were then fitted to the pseudo-first order and pseudo-second order models.The results showed that phenol uptake onto adsorbents could be followed by the pseudo-second order model,while VB₁₂ onto adsorbents would be more suitably represented by the pseudo-first order model.更多还原