正丁醇/水混合溶剂中一步合成NO_3-LDH的研究  

The synthesis of nitrate-intercalated layered double hydroxides(NO_3-LDH) in n-BuOH/water mixed solvents

作　　者：黄改玲[1] 孙迎迎[1] 陈凤华[1] 马淑兰[2] 

机构地区：[1]郑州轻工业学院材料与化学工程学院,郑州450002 [2]北京师范大学化学学院,北京100875

出　　处：《北京化工大学学报（自然科学版）》2017年第6期56-62,共7页Journal of Beijing University of Chemical Technology(Natural Science Edition)

基　　金：河南省高校科技创新人才支持计划(15HASTIT048);河南省科技厅基础与前沿技术研究项目(162300410216);河南省高等学校青年骨干教师资助计划(2015GGJS-181)

摘　　要：以尿素为沉淀剂,正丁醇/水混合液为溶剂,采用水热法直接合成层状双金属氢氧化物Zn Al-NO_3-LDHs。通过X射线衍射(XRD)、傅里叶变换红外光谱(FT-IR)、扫描电镜(SEM)和元素分析(CHN)等对所得样品进行表征,证明在尿素存在条件下,NO-3进入LDHs层间;XRD、SEM结果和丁达尔现象显示所得NO_3-LDHs可在甲酰胺溶液中剥离。对尿素存在条件下形成NO_3-LDH而非CO3-LDH的机理进行了探讨。以氯化盐和硫酸盐为原料,采用本文方法成功合成了Cl-LDH和SO4-LDH,此研究结果可为制备不同阴离子插层的LDHs提供一种简单直接的方法。ZnAl-NO3-LDHs have been directly synthesized in an n-Bu OH/water system using urea as a precipitating agent via a hydrothermal method. The as-prepared samples were characterized by XRD,FT-IR,SEM,TEM and elemental analysis. The results confirmed that NO-3 ions had been intercalated into the LDHs interlayer galleries even in the presence of urea. The Tyndall phenomenon,XRD and SEM results showed that the obtained NO3-LDHs could be delaminated in formamide. The mechanism of the formation of NO3-LDH rather than the expected CO3-LDH in the presence of urea has been discussed. Using this method,two other types of LDHs with Cl-and SO2-4 anions in the interlayer galleries were also successfully synthesized by using metal chloride salts and metal sulfate salts as starting reagents,respectively. Our findings may provide a cheap and direct way to prepare LDHs with the desired anions in the interlayer galleries.

关 键 词：硝酸根型层状双金属化合物(NO3-LDHS) 正丁醇/水 剥离 生长机理 

分 类 号：O643.3[理学—物理化学]