CPVA微球表面接枝对羟基苯磺酸钠及其对茶碱的吸附研究

Grafting of sodium p-hydroxybenzene sulfonate on surface of CPVA microspheres and its adsorption for theophylline

通过分子设计将2-氯乙基异氰酸酯(CIC)键合至聚乙烯醇微球(CPVA)表面制得CPVA-CIC,再将对羟基苯磺酸钠(HSS)固载于CPVA-CIC上制得功能微球CPVA-HSS。通过红外光谱(FI-TR)、扫描电子显微镜(SEM)及Zeta电位仪对功能微球进行表征,并考察主要因素对接枝微球固载量的影响,探索功能微球CPVA-HSS对茶碱分子的吸附性能及吸附机理。结果表明,通过CIC改性,阴离子单体HSS成功固载于基质CPVA表面,形成功能微球CPVA-HSS。CPVA-HSS对茶碱吸附5 h达到平衡,凭借其强的静电相互作用,pH5时在水溶液中吸附容量可达60 mg/g,随着温度的降低吸附量升高,而随介质盐度的增大吸附容量降低。功能微球的重复使用性较好。

Through molecular design,2-chloroethyl isocyanate(CIC)is bonded onto the surface of polyvinyl alcohol microspheres(CPVA)to obtain CPVA-CIC.Sodium p-hydroxybenzene sulfonate(HSS)is solidly loaded on CPVA-CIC to produce CPVA-HSS functional microspheres,which are characterized by means of infrared spectroscopy(FT-IR),scanning electron microscopy(SEM)and zeta potential.The effects of main factors on the loading capacity of the grafted microspheres are examined and investigated.The adsorption performance and mechanism of CPVA-HSS for theophylline molecules are explored.Experimental results indicate that through CIC modification,HSS anionic monomer is successfully solidified on the surface of CPVA substrate to form CPVA-HSS.The adsorption of CPVA-HSS for theophylline has reached equilibrium in 5 h.Thanks to its strong electrostatic interaction,CPVA-HSS's adsorption capacity can reach 60 mg·g-1 in an aqueous solution with a pH of 5.The adsorption capacity of CPVA-HSS increases with the decrease of temperature,and declines with the increase of medium salinity.CPVA-HSS functional microspheres exhibit good reusability.