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采用浸渍沉淀相分离法制备了壳聚糖-聚乙烯醇(CS-PVA)吸附膜。通过扫描电子显微镜表征证实,此法制得的膜表面粗糙多孔,是一种疏松结构,对Cd2+的吸附效果大大高于流延法制得的光滑致密膜。对浸渍沉淀相分离法制得的膜进行了吸附时间、吸附pH以及吸附剂量等影响因素的考察,结果表明,这些因素对Cd2+的去除率影响显著,在pH=6、吸附膜质量与初始质量浓度100 mg/L的Cd2+溶液体积比为50 mg/mL、吸附时间240 min时,Cd2+的去除率最大。对吸附前后膜结构的变化进行了红外光谱仪、X射线衍射仪的分析,并对膜的“吸附-脱附”循环使用次数进行了研究,确定此法制得吸附膜性能稳定,可以有效去除Cd2+。
Chitosan-polyvinyl alcohol (CS-PVA) adsorption film was prepared by impregnation and precipitation phase separation. Scanning electron microscopy confirmed that the surface of the film prepared by this method is rough and porous, which is a loose structure. The Cd2 + adsorption effect is much higher than that of the smooth dense film prepared by the casting method. The results showed that these factors had a significant effect on the removal rate of Cd2 +. At pH = 6, the adsorption membrane mass and the initial mass concentration The removal rate of Cd2 + was the highest when the volume ratio of 100 mg / L Cd2 + was 50 mg / mL and the adsorption time was 240 min. The changes of membrane structure before and after adsorption were analyzed by infrared spectroscopy and X-ray diffractometer, and the number of “adsorption-desorption” cycles of membrane was studied. The results showed that the adsorption membrane was stable and could be effectively removed Cd2 +.