醋酸根型层状双氢氧化物与蒙脱石的插层组装作用研究  

Intercalation Assembly of Acetate Intercalated Layered Double Hydroxide and Montmorillonite

作　　者：梁启超[1] 陈耀[1] 李存军[1] 谢襄漓[2] 王海[1] 王林江 

机构地区：[1]桂林理工大学材料科学与工程学院,桂林541004 [2]桂林理工大学化学与生物工程学院,桂林541004 [3]广西有色金属及特色材料加工国家重点实验室培育基地,桂林541004 [4]有色金属清洁冶炼与综合利用广西高校重点实验室,桂林541004

出　　处：《人工晶体学报》2015年第10期2874-2880,共7页Journal of Synthetic Crystals

基　　金：国家自然基金(41272064;51462007;41572034)

摘　　要：在水热法合成硝酸根型层状双氢氧化物（NO3-LDH）的基础上,用离子交换法制备醋酸根离子插层层状双氢氧化物（Aco-LDH）。在超声作用下,利用水分子对Aco-LDH层间域内氢键网络的破坏作用实现了Aco-LDH的剥离。利用蒙脱石在水中的溶胀特性实现了其片层的分散剥离。将剥离后的LDH片层与剥离蒙脱石（MMT）进行插层组装获得了LDH/MMT层状复合材料。用XRD、FTIR、TEM、AFM、N2吸附-脱附等手段对样品进行了表征。结果表明,当Aco-LDH浓度为1 mg/m L时,在水中超声处理获得厚度为5~20 nm的LDH片层。蒙脱石分散后其层间距扩大,结晶程度降低。插层组装作用获得的LDH/MMT层状复合材料的主体为蒙脱石,LDH与MMT之间形成片-片组装结构,复合物的层间距为1.50 nm,接近单元LDH片层与单元MMT片层的堆叠结构厚度,比表面积达105.89 m2/g。Acetate-intercalated layered double hydroxide （Aco-LDH） was prepared by ion-exchange of NO3-LDH with sodium acetate trihydrate. The Aco-LDH was delaminated by ultrasonic processing in aqueous solution and montmorillonite （MMT） was dispersed into lamella in water. The LDH/MMT layered composite was gained by electrostatic attraction of delaminated LDH nanosheets with the interlayer of MMT. The composite was characterized by X-ray diffraction （XRD）, fourier transform infrared spectroscopy （ FTIR）, transmission electron microscope （ TEM）, atomic force microscope （ AFM ） and N2-adsorption/desorption. The results show that the thickness of delaminated Aco-LDH nanosheets was 5 nm to 20 nm at the Aco-LDH concentration of 1 mg/mL. The LDH/MMT layered composite obtained by intercalation assembly has sheet-by-sheet assembly structure, and the interlayer space of the composite is 1.50 nm, which is almost the thickness summation of one LDH sheet and one MMT sheet. The specific surface area of the composite is 105.89 m2/g.

关 键 词：层状双氢氧化物 离子交换 蒙脱石 剥离 插层组装 

分 类 号：TB332[一般工业技术—材料科学与工程]