SnNb2O6纳米片的合成及对达氟沙星的吸附

doi:10.7503/cjcu20190005

摘要/Abstract

摘要：

通过水热反应制备了新型SnNb₂O₆纳米片吸附剂, 并利用X射线衍射(XRD)、扫描电子显微镜(SEM)和比表面积及孔径分析等手段对其结构和形貌进行了表征. 以第三代喹诺酮类抗生素达氟沙星为吸附质, 进行了影响因素实验、吸附动力学实验及等温吸附实验, 探究了SnNb₂O₆对达氟沙星的吸附性能和吸附机理. 实验结果表明, SnNb₂O₆吸附剂具有片状形貌, 层状单斜相晶体结构, 比表面积为52.89 m²/g. 吸附剂用量、吸附温度、溶液pH值及吸附时间均对吸附率有一定影响. 相应的等温吸附曲线可以较好地拟合Freundlich方程, 且动力学实验数据可以用拟二级动力学方程描述, 其中液膜扩散为主要控制步骤. 在35 ℃下, 吸附剂用量为0.09 g, 控制溶液pH值为6.02时, 吸附30 min即可达到较好效果, 此时达氟沙星的吸附去除率为93.1%.

关键词: 吸附剂, SnNb₂O₆, 纳米片, 达氟沙星

Abstract:

A novel SnNb₂O₆ nano-adsorbent was prepared via hydrothermal method. The structure and morphology of the sample were characterized by X-ray powder diffraction(XRD), scanning electron microscopy(SEM) and Brunauer-Emmett-Teller(BET) techniques. Danofloxacin, as one of the third generation of quinolone antibiotics, was used as the adsorption target. The influencing factors experiment, adsorption kinetics experiment and isothermal adsorption experiment were designed to investigate the adsorption performance and adsorption mechanism of SnNb₂O₆ adsorbent. The results showed that the SnNb₂O₆ adsorbent has a layered monoclinic phase crystal structure with a specific surface area of 52.89 m²/g. In addition, the amount of adsorbent, adsorption temperature, pH value and adsorption time all have an effect on the adsorption efficiency. The adsorption process conforms to the Freundlich equation at 35 ℃ and the adsorption kinetics meets the Pseudo-second-order kinetic equation, suggesting liquid film diffusion is dominant factor in adsorption process. At optimal conditions of 35 ℃ and pH=6.02 with the dosage of 0.09 g, the adsorption efficiency is up to 93.1% in 30 min.

Key words: Adsorbent, SnNb₂O₆, Nanoplates, Danofloxacin

中图分类号:

O611.3

TrendMD:

赵洁, 宋强, 郭笑, 吴飞, 田昊川, 卢朝薇. SnNb₂O₆纳米片的合成及对达氟沙星的吸附. 高等学校化学学报, 2019, 40(6): 1121.

ZHAO Jie,SONG Qiang,GUO Xiao,WU Fei,TIAN Haochuan,LU Zhaowei. Synthesis of SnNb₂O₆ Nanoplates and Its Application for Danofloxacin Adsorption^†. Chem. J. Chinese Universities, 2019, 40(6): 1121.

图/表 11

Fig.1 XRD patterns of SnNb2O6

Fig.2 SEM images of SnNb2O6 with different magnifications

Fig.3 Crystal structure of SnNb2O6

Fig.4 N2 adsorption-desorption isotherms of SnNb2O6 nanoplates

Fig.5 Pore size distribution of SnNb2O6 obtained from N2 adsorption data

Fig.6 Effect of SnNb2O6 dosage on the adsorption of danofloxacin

Fig.7 Effect of solution temperature on the adsorption of danofloxacin

Fig.8 Effect of pH on danofloxacin adsorption by SnNb2O6 nanoplates

Fig.9 Effect of time on danofloxacin adsorption by SnNb2O6 nanoplates

Fig.10 Pseudo-second order kinetic curve of danofloxacin adsorption

Fig.11 Adsorption curve of danofloxacin fitted by Freundlich equation

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SnNb₂O₆纳米片的合成及对达氟沙星的吸附

Synthesis of SnNb₂O₆ Nanoplates and Its Application for Danofloxacin Adsorption^†

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