β-环糊精微球的制备及其对α-萘酚和3,5-二硝基水杨酸吸附性能的研究

Synthesis of β-cyclodextrin polymer and adsorption study for α-naphthol and 3,5-bisnitro salicylic acid

研究了以β-环糊精(β-CD)为原料,环氧氯丙烷为交联剂,采用反相乳液聚合法制备的β-环糊精聚合物微球(β-CDPM)对α-萘酚和3,5-二硝基水杨酸的吸附行为和脱附行为,分析了其动力学特征,绘制了不同温度下的吸附等温线。结果表明,β-CDPM对α-萘酚和3,5-二硝基水杨酸的吸附平衡时间为2 h,对两种有机物的一级吸附动力学模型和二级吸附动力学模型都有较好拟合,相关系数分别为0.953 77和0.999 37;0.969 23和0.998 95。在30,40,50℃下吸附等温线符合Langmuir方程和Freundlick方程,且在不同温度下拟合得到的1/n分别为:1.258 58,1.047 46和0.896 24;0.513 05,0.981 95和0.724 67基本上都<1,属优惠吸附;随时间的延长,脱附量不断增大,且在72 h后基本达到平衡。

β-Cyclodextrin polymer microspheres （β-CDPM） were synthesized from β-cyclodextrin （β-CD）by inverse emulsion polymerization with epichlorohydrin as a cross linking agent.Thermodynamic and kinetic characteristics as well as adsorption of β-CDPM for α-naphthol and 3,5-bisnitro salicylic acid from aqueous solution were investigated.Static adsorption isotherms at different temperatures illustrated that adsorption of α-naphthol and 3,5-bisnitro salicylic acid on β-CDP microspheres reached a balance after 2 h.The adsorption fitted with the first-and second-order dynamic equations,and the correlation coefficients were 0.953 77 and 0.999 37 ; 0.969 23 and 0.998 95,respectively.The Langmuir and the Freundlick adsorption isotherm equations were adapted for the adsorption characteristics ofβ-CDPM for α-naphthol and 3,5-bisnitro salicylic acid at temperatures of 30,40,50 ℃.And in different temperature fitting get 1/n respectively is：1.258 58,1.047 46 and 0.896 24 ;0.513 05,0.981 95 and 0.724 67 basically all less than 1,adsorption of preferential.With the extension of time release kinetics release quantity has been increasing,and the release of the 72 h after basic balance.