壳聚糖-LDHs的合成及吸附Cu^(2+)的实验研究  

SYNTHESIS AND ADSORPTION OF Cu^(2+) BY CHITOSAN-LDHs

作　　者：蔡丽华 崔正吉 胡萧逸 郭达 施晓文[2] CAI Lihua;CUI Zhengji;HU Xiaoyi;GUO Da;SHI Xiaowen(Environmental and Biological Engineering College Wuhan Technology and Business University,Wuhan 430065,China;School of Resource and Environmental Sciences,Wuhan University,Wuhan 430063,China)

机构地区：[1]武汉工商学院环境与生物工程学院,武汉430065 [2]武汉大学资环学院,武汉430063

出　　处：《离子交换与吸附》2018年第4期326-336,共11页Ion Exchange and Adsorption

基　　金：湖北省教育厅科研计划基金资助项目B2016338

摘　　要：以壳聚糖、氯化镁、氯化铝作为主要原料,在100℃水热条件下,通过原位合成的方法制备了一种壳聚糖复合多层材料(壳聚糖-LDHs),利用扫描电镜及X射线衍射仪、红外光谱等对所得样品的结构进行了表征。以其为吸附剂吸附Cu^(2+),通过单因素实验和L9 (3~3)正交试验研究了pH值、吸附时间及初始浓度对吸附效果的影响。结果表明,壳聚糖-LDHs吸附Cu^(2+)的最佳条件是pH=3.5、吸附时间为60min、初始浓度为21mg/L,吸附平衡时去除率为99.2%、吸附容量为32.56mg/g。通过研究该吸附机理发现,其动力学特征符合准二级动力学方程,通过与3种等温吸附模型拟合,得出该吸附剂对Cu^(2+)的吸附效果很好,属于化学吸附。A chitosan composite multilayer （chitosan-LDHs） was prepared at 100℃ hydrothermal condition with chitosan, magnesium chloride and aluminum chloride as raw materials. The Structures and properties were carefully characterized by scanning electron microscopy （SEM）, X-ray diffraction （XRD）. Adsorption experiments indicated that the chitosan-LDHs showed the good adsorption capability for Cu2＋ through single factor experiment and L9（33） orthogonal experiment. The results showed that the adsorption time of chitosan composite multilayers as adsorbent was pH 3.5, the adsorption time was 60min, the initial concentration was 21mg/L, the removal rate was 99.2% and the adsorption capacity was 32.56mg/g. According to the adsorption kinetics simulation, the Cu2＋ adsorption of chitosan-LDHs corresponds to Pseudo-second-order kinetics, and studied Langmuir, Freundlich and D-R isotherm model, which implies a dominant chemical adsorption.

关 键 词：壳聚糖 层状双金属氢氧化物 复合物 吸附 CU^2+ 

分 类 号：O648.8[理学—物理化学]