Synthesis of SnNb2O6 Nanoplates and Its Application for Danofloxacin Adsorption†

doi:10.7503/cjcu20190005

Abstract

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

CLC Number:

O611.3

TrendMD:

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

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

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