壳聚糖-聚乙烯醇吸附膜的制备及对Cd2＋吸附性能的研究  

PREPARATION AND Cd^(2+) ADSORPTION CAPACITY OF CHITOSAN-POLYVINYL ALCOHOL MEMBRANE

作　　者：吴婷婷 李磊 王玉如 邹路易[2] 顾文秀 

机构地区：[1]江南大学化学与材料工程学院 [2]江南大学环境与土木工程学院:江苏无锡,214122

出　　处：《水处理技术》2013年第3期44-47,50,共5页Technology of Water Treatment

基　　金：中央高校基本科研业务费专项资金(JUSRP211A08)

摘　　要：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+。The chitosan/polyvinyl alcohol（CS-PVA） adsorption membrane was prepared by immersion-precipitation phase inversion technique.The morphology of the prepared membrane was described by scanning electronic microscopy.The surface of the membrane is rough,porous and loose,quite different from the membrane prepared by means of casting,which had a smooth and dense structure.Its adsorption capacity of Cd2＋is higher than that of the dense membrane.In addition,the adsorption time,pH and the dosage of the membrane produced by immersion-precipitation phase inversion technique were investigated.The results show that these factors have a pronounced effect on the removal of Cd2＋,and the maximum removal rate is reached at pH= 6,the solid-liquid ratio of the adsorbent and initial Cd2＋solution（100 mg/L） is 50 mg/mL and adsorption time is 240 min.The changes of the membrane structure before and after adsorption were analysed by FT-IR and XRD,and the reused times of the membrane were investigated.The results indicate that the membrane is stable and effective to remove Cd2＋.

关 键 词：壳聚糖 聚乙烯醇 吸附膜 重金属离子 

分 类 号：TQ028.8[化学工程]