| 锌镍铝水滑石微球的制备及吸附性能 |
| Preparation and Adsorption Properties of Microspheres of ZnNiAl Layered Double Hydroxides |
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| 摘要: 以Zn（NO3）2·6H2O、Ni（NO3）2·6H2O、Al（NO3）3·9H2O和尿素为原料，采用一步水热法制备分散性良好的三元锌镍铝水滑石（ZnNiAl-LDHs）微球。通过X射线衍射（XRD）、傅里叶转换红外光谱（FTIR）、场发射扫描电镜（FESEM）、透射电镜（TEM）和氮气吸附-脱附等测试手段对样品的结构和形貌进行表征，并比较ZnNiAl-LDHs和ZnAl-LDHs对甲基橙（MO）的吸附性能。结果表明，ZnNiAl-LDHs是由纳米片组成、具有3D结构的微球，粒径为1~2.5 μm，比表面积为156 m2·g-1，远大于ZnAl-LDHs的比表面积38 m2·g-1；ZnNiAl-LDHs和ZnAl-LDHs对甲基橙的饱和吸附量分别为329.60和143.47 mg·g-1，ZnNiAl-LDHs表现出更强的吸附能力，其吸附等温线和吸附动力学分别符合Langmuir等温线模型和准二级动力学模型。 |
| 关键词: 锌镍铝水滑石 微球 吸附 甲基橙 |
| 基金项目: |
| Abstract: Uniform well-defined ZnNiAl-LDHs microspheres have been fabricated via a simple hydrothermal method with Zn(NO3)2·6H2O, Ni(NO3)2·6H2O, Al(NO3)3·9H2O and urea as materials. The phase identification and morphology of the LDHs were characterized by XRD, FTIR, SEM, TEM and N2 adsorption-desorption. And the adsorption performance of ZnNiAl-LDHs and ZnAl-LDHs toward methyl orange (MO) was compared. Results show that ZnNiAl-LDHs microspheres have a three dimensional structure which composed of nanosheets, and their particle size is in the range of 1~2.5 μm. The specific surface area of ZnNiAl-LDHs microspheres is 156 m2·g-1 which is much larger than that of ZnAl-LDHs (38 m2·g-1). The saturation adsorbance of ZnNiAl-LDHs and ZnAl-LDHs toward MO are 329.60 and 143.47 mg·g-1, respectively, which shows that ZnNiAl-LDHs exhibits excellent adsorption performance. The adsorption kinetics and adsorption isotherms of ZnNiAl-LDHs microspheres can be well described by the pseudo-second order kinetic and Langmuir isotherm. |
| Keywords: ZnNiAl-LDHs microspheres adsorption methyl orange |
| 投稿时间：2016-05-30 修订日期：2016-09-28 |
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| 王澜,葛圣松,邵谦,李健,杜玲玉.锌镍铝水滑石微球的制备及吸附性能[J].无机化学学报,2016,32(11):1896-1904. |
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