低聚壳聚糖-水滑石的自组装、表征及脱铅性能研究  

Self-assembly,Characterization and Lead Ion Adsorption Performance of Chitosan-LDHs

作　　者：那骥宇[1] 陈慧[1] 梁宝臣[1] 那平[2] 

机构地区：[1]天津理工大学化学化工学院,天津300384 [2]天津大学化工学院,天津300072

出　　处：《材料导报》2010年第22期109-112,118,共5页Materials Reports

基　　金：国家科技支撑计划项目(2007BAI46B04)

摘　　要：利用水滑石类层柱化合物(LDHs)处理重金属阳离子污染物,目前国内研究尚少。选用具有生物安全性的壳聚糖为改性剂,通过自组装共沉淀反应和表面修饰技术使其与水滑石基体形成超分子体系,制备出具有强螯合性能的低聚壳聚糖-水滑石(COS-LDHs)。实验表明,经少量COS-LDHs处理1.5h后,水溶液中Pb2+的质量浓度从5mg/L降到2μg/L以下;XRD、XPS、FT-IR、TG-DTA、BET、TEM等表征说明COS-LDHs在自组装过程中结晶良好、层间结构稳定、比表面积增加且改性分子与基体的复合良好。It is infrequent to use LDHs as a scavenger in the area of heavy metal cation removal. Chitosan which has biological safety is chosen as modifier, COS-LDHs with strong chelating property is prepared by the self-as- sembly coprecipitation and surface modification technology. It shows that concentration of lead ions decreases from 5mg/L to 2p.g/L after 1.5h treatment with COS-LDHs. Good crystallization, stable layer structure and large specific surface area are characterized by XRD, XPS, FT-IR, TG-DTA, BET and TEM results. Good combination of modifier and substrate is obtained.

关 键 词：水滑石 螯合作用 壳聚糖 重金属 痕量 

分 类 号：O636.1[理学—高分子化学]