鞣酸模板交联壳聚糖/凹凸棒石黏土复合树脂的制备与表征

以鞣酸为模板,采用乳化交联法制备了鞣酸模板交联壳聚糖/凹土复合树脂(TA-CS/ATP)。采用扫描电子显微镜(SEM)和傅里叶变换红外光谱仪(FT-IR)分别对树脂形貌和结构进行表征,用孔参数对其性能进行评价。考察了模板分子的加入量对树脂吸附容量的影响,并根据洗脱率对模板洗脱液进行选择。结果表明:与非模板树脂相比,当壳聚糖与模板的质量比为1.00∶0.05时,树脂的孔度值和膨胀率分别从48%和57.41%提高到79%和87.05%,吸附容量由314.7 mg/g增加到445.7 mg/g。树脂的再生性能研究表明,凹土和模板分子的加入,使树脂在酸中的失重率从18.45%降低到6.18%,且树脂经过4次再生使用仍然具有较高的吸附容量。

Preparation and characterization of crosslinked chitosan/attapulgite composite resin with tannic acid as a template

The crosslinked chitosan/attapulgite composite resin(TA-CS/ATP) is prepared by emulsion cross-linking method with tannic acid as a template.The morphology and structure of the resin are characterized by SEM and FT-IR.The performance of resin is evaluated by pore parameters.The effect of the amount of template on the adsorption of resin is investigated.The results show that,comparing with the non-templated resin,when the ratio of crosslinked chitosan and template is 1.00∶0.05,the porosity values and expansion rate of resin increase from 48% and 57.41% to 79% and 87.05%,respectively.At the same time,the adsorption of templated resin is increased from 314.7 mg/g to 445.7 mg/g.The result of regeneration of the resin suggests that the loss weight rate of resin in acid decreases from 18.45% to 6.18% when ATP and template molecular are incorporated to the resin.Moreover,the adsorption capacity is also high after four times regeneration.