软模板法制备三维花状MgAl-LDH及其吸附性能
Preparation by Using Soft Template and Adsorption Properties of Three-Dimensional Flower-like MgAl-LDH
作者单位E-mail
黄云 南昌大学资源环境与化工学院鄱阳湖环境与资源利用教育部重点实验室, 南昌 330031  
马若男 南昌大学资源环境与化工学院鄱阳湖环境与资源利用教育部重点实验室, 南昌 330031  
曾宪哲 南昌大学资源环境与化工学院鄱阳湖环境与资源利用教育部重点实验室, 南昌 330031  
相明雪 南昌大学资源环境与化工学院鄱阳湖环境与资源利用教育部重点实验室, 南昌 330031  
崔锡俊 南昌大学资源环境与化工学院鄱阳湖环境与资源利用教育部重点实验室, 南昌 330031  
章萍 南昌大学资源环境与化工学院鄱阳湖环境与资源利用教育部重点实验室, 南昌 330031
南昌大学环境检测中心, 南昌 330031 
zhangping@ncu.edu.cn 
摘要: 采用软模板法,以十二烷基硫酸钠(SDS)为模板剂,经水热合成制得三维花状双金属(MgAl)氢氧化物(3D-MgAl LDH)。通过XRD、FT-IR、SEM及TEM等表征手段,研究了原料Mg/Al物质的量之比、SDS浓度及反应时间对产物微观结构和表面形貌的影响规律,并初步探讨了3D-MgAl LDH的形成机理。结果表明,当nMg/nAl=2,SDS浓度为0.1 mol·L-1,水热反应时间为6 h时,可形成结晶度良好、花球形貌完整,纳米片厚度均一的三维花状LDH。在3D-MgAl LDH的形成过程中,SDS既以阴离子形态参与LDH形成,又因其类球状胶束特性附着在已形成的LDH表面或边缘诱导LDH纳米片交叉生长形成三维花状。吸附实验表明,3D-MgAl LDH对非离子型有机污染物具有良好的吸附作用,最大吸附量约为31 mg·g-1,去除率达到100%。
关键词: 三维花状  镁铝LDHs  软模板  吸附  
基金项目: 国家自然科学基金(No.214167014,21767018)、江西省杰出青年人才(No.20171BCB23017)、中国博士后科学基金第61批面上项目(No.2017M184133)和南昌大学研究生创新专项资金(No.CX 2017289)资助。
Abstract: Three-dimensional flower-like LDH (3D-MgAl LDH) microspheres were successfully synthesized via hydrothermal method. The sodium dodecylsulfate was used as soft template. The effect of Mg/Al mole ratio, the concentration of SDS and the reaction time on the crystallinity, composition and morphology of 3D-MgAl LDH were investigated by XRD, FT-IR, SEM and TEM. The results show that the optimal condition for uniform 3D-MgAl LDH microspheres with high crystallinity, regular flower-like morphology and thickness uniformity of nanosheets are as follows, nMg/nAl=2, the concentration of SDS was 0.1 mol·L-1, and reaction time of 6 h. In addition, the growth mechanism of 3D-MgAl LDH was also inferred, SDS was used for intercalated anion to form LDH as well as could form micelles that bond to the outside surfaces and plate edges of LDH, which induced LDH nanosheet cross-growth. Finally, the adsorption activity present that 3D-MgAl LDH exhibits great adsorption capacity of ca. 30 mg·g-1 for naphthalene and the removal rate of 100%.
Keywords: three-dimensional flower-like  Mg-Al LDH  soft template  adsorption  naphthalene
投稿时间:2018-01-04 修订日期:2018-03-21
摘要点击次数:  135
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黄云,马若男,曾宪哲,相明雪,崔锡俊,章萍.软模板法制备三维花状MgAl-LDH及其吸附性能[J].无机化学学报,2018,34(5):925-932.
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