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

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

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。

The crosslinked chitosan/attapulgite composite resin （TA-CS/ATP） is prepared by emulsion crosslinking 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 erosslinked 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.