交联黄原酸化壳聚糖树脂对水溶液中棒曲霉素的吸附

Adsorption of patulin from aqueous solutions using cross-linked xanthated chitosan resin

以壳聚糖为吸附剂,戊二醛作为交联剂,采用反相悬浮交联法制备球状壳聚糖树脂,利用二硫化碳作为改性剂,在碱性条件下对壳聚糖树脂进行黄原酸化改性,制备成交联黄原酸化壳聚糖树脂(crosslinked xanthated chitosan resin,CXCR)。对CXCR进行红外表征,并研究了其对水溶液中棒曲霉素的吸附性能。结果表明,CXCR在棒曲霉素初始浓度为8 mg/L,CXCR用量为1 g/L,溶液p H值=4,25℃下吸附16 h,吸附量可达6.53 mg/g,可有效地吸附水溶液中的棒曲霉素。CXCR对棒曲霉素的吸附符合拟二级动力学模型;吸附热力学符合Freundlich吸附等温线模型。CXCR有望作为一种新型的材料用于棒曲霉素的吸附,具有广阔的应用前景。

Cross-linked xanthated chitosan resin was prepared by the method of inverse suspension cross-linking using glutaraldehyde as cross-linking agent and carbon disulfide as modification agent.The addition of thiol group on cross-linked chitosan enhanced its interaction with patulin in aqueous solution and increased the ad-sorption ability of CXCR for patulin.The adsorption mechanism of CXCR for patulin was characterized by FT-IR.The influence of various parameters on the adsorption capacity of CXCR for patulin was investigated.The results showed that the adsorption capacity was 6.53 mg/g when 8 mg/L patulin was adsorbed at pH=4,25 ℃for 1 6 h by adding 1 g/L CXCR.The adsorption process was found to follow pseudo-second order kinetics mod-el.The experimental data fitted Freundlich adsorption isotherm model.It indicated that CXCR is a very promis-ing biosorbent for the adsorption of patulin from aqueous solutions.