高分散镁铝层状双氢氧化物的煅烧改性及其对甲基橙的吸附性能研究  

Calcination Modification of Highly Dispersed Magnesium-Aluminum Layered Double Hydroxides and Its Adsorption Properties for Methyl Orange

作　　者：奚羽 郑国源[1,2] 吴彩红 王吉林 王燕舞[3] 龙飞 邹正光[1,2] XI Yu;ZHENG Guoyuan;WU Caihong;WANG Jilin;WANG Yanwu;LONG Fei;ZOU Zhengguang(Guangxi Key Laboratory of Optical and Electronic Materials and Devices, School of Materials Science and Engineering, Guilin University of Technology, Guilin 541004, China;Collaborative Innovation Center for Exploration of Hidden Nonferrous Metal Deposits and Development of New Materials in Guangxi, Guilin University of Technology, Guilin 541004, China;College of Environmental Science and Engineering, Guilin University of Technology, Guilin 541004, China)

机构地区：[1]桂林理工大学材料科学与工程学院,广西光电材料与器件重点实验室,桂林541004 [2]桂林理工大学,广西有色金属隐伏矿床勘查及材料开发协同创新中心,桂林541004 [3]桂林理工大学环境科学与工程学院,桂林541004

出　　处：《人工晶体学报》2020年第3期532-541,共10页Journal of Synthetic Crystals

基　　金：国家自然科学基金(51672052);广西“特聘专家”专项经费。

摘　　要：以Mg(NO3)2·6H2O为镁源,Al(NO3)3·9H2O为铝源,采用水热法制备了高分散的镁铝层状双氢氧化物MgAl-LDH,并高温煅烧生成MgAl-LDO。利用场发射扫描电子显微镜(FE-SEM)、X射线衍射(XRD)、透射电子显微镜(TEM)、傅里叶变换红外光谱(FTIR)、X射线光电子分析(XPS)、氮气吸附-脱附法对产物进行表征分析,并且探讨了其吸附机理。结果表明,2种产物的吸附过程对比于Langmuir吸附模型基本一致,其中MgAl-LDO的比表面积更大,吸附性能更好,对甲基橙的最大吸附量可达925.9 mg·g^-1。吸附机制包括化学作用、氢键、静电作用和表面络合作用。Using Mg(NO3)2·6H2O as the magnesium source and Al(NO3)3·9H2O as the aluminum source,a highly dispersed magnesium-aluminum layered double hydroxide MgAl-LDH was prepared by hydrothermal method and calcined to generate MgAl-LDO.The product was characterized and analyzed by Field emission scanning electron microscope(FE-SEM),X-ray diffraction(XRD),transmission electron microscope(TEM),Fourier transform infrared spectroscopy(FTIR),X-ray photoelectron analysis(XPS),nitrogen adsorption-desorption method,and its adsorption mechanism was discussed.The results show that the adsorption process of the two products is basically the same as the Langmuir adsorption model.Among them,the specific surface area of MgAl-LDO is larger and the adsorption performance is better.The maximum adsorption capacity of methyl orange can reach 925.9 mg·g^-1.Adsorption mechanisms include chemical interaction,hydrogen bonding,electrostatic interaction,and surface complexation.

关 键 词：层状双氢氧化物 水热法 吸附 甲基橙 纳米片状 

分 类 号：O647.3[理学—物理化学]