圆片Mg-Al双氢氧化物的制备及其对水中刚果红的去除  

Synthesis of Circular Plate-like Mg-Al Layered Double Hydroxide and Its Removal of Congo Red from Aqueous Solution

作　　者：李兵[1] 张永兴[1] 刘亲壮[1] 刘忠良[1] 

机构地区：[1]淮北师范大学物理与电子信息学院,安徽淮北235000

出　　处：《淮北师范大学学报（自然科学版）》2017年第1期31-35,共5页Journal of Huaibei Normal University：Natural Sciences

基　　金：国家自然科学基金青年项目(11504120;51302102);安徽省自然科学基金青年项目(1608085QE90)

摘　　要：以水和乙醇为混合溶剂,制备Mg-Al层状双氢氧化物,样品具有单分散圆片结构.利用X射线衍射(XRD)、扫描电子显微镜(SEM)、透射电子显微镜(TEM)对样品结构进行表征.进一步研究样品对水中有机污染物刚果红(CR)的吸附性能,吸附等温曲线遵循Langmuir模型,吸附动力学曲线符合准二级模型,其最大吸附量为129.87 mg/g,表明制备的Mg-Al双氢氧化物是一种高效有机染料吸附剂.最后探讨样品对刚果红的吸附机制,主要以离子交换为主.In this paper,monodispersed and uniform circular plate-like magnesium-aluminum layered doublehydroxide（Mg-Al LDHs）was synthesized by an ethanol-water mediated solvothermal method. The struc-tures were characterized by X-ray diffraction（XRD）,scanning electron microscope（SEM）and transmissionelectron microscopy（TEM）. They were used as adsorbents for removal of Congo red（CR）from aqueous so-lution,and the adsorption isotherm and kinetics process were further investigated. The adsorption isothermand kinetics of Mg-Al LDHs can be described by the Langmuir isotherm and the pseudo-second-order kinet-ics. The maximum adsorption capacity was about 129.87 mg/g,which are higher than those of the other met-al oxide nanostructures,indicating that the Mg-Al LDHs we synthesized are high-performance adsorbents fororganic dye removal. The adsorption mechanism for the Mg-Al LDHs is ion exchange.

关 键 词：混合溶剂热 镁铝层状双氢氧化物 吸附 离子交换 

分 类 号：O614.0[理学—无机化学]