A novel amino-functionalized magnetic silica (Fe3O4@SiO2-NH2) was easily prepared via a one-step method integrating the immobilization of 3-aminopropyltriethoxysilane with a sol-gel process of tetraethyl orthosilicate into a single process. This showed significant improvement in the adsorption capacity of anionic dyes. The product (Fe3O4@SiO2-NH2) was characterized with scanning electron microscopy, Fourier transform infrared spectroscopy, energy dispersive X-ray spectrometry, zeta potential and vibrating sample magnetometry. The adsorption performance of Fe3O4@SiO2-NH2 was then tested by removing acid orange 10 (AO10) and reactive black 5 (RB5) from the aqueous solutions under various experimental conditions including initial solution pH, initial dye concentrations, reaction time and temperature. The results indicated that the maximum adsorption capacity of AO10 and RB5 on Fe3O4@SiO2-NH2 was 621.9 and 919.1 mg g−1 at pH 2, respectively. The sorption isotherms fit the Langmuir model nicely. Similarly, the sorption kinetic data were better fitted into the pseudo-second order kinetic model than the pseudo-first order model. In addition, the thermodynamic data demonstrated that the adsorption process was endothermic, spontaneous and physical. Furthermore, Fe3O4@SiO2-NH2 could be easily separated from aqueous solutions by an external magnetic field, and the preparation was reproducible.
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Research Article|
January 02 2017
Enhanced adsorption removal of anionic dyes via a facile preparation of amino-functionalized magnetic silica
Xiao-Shui Li;
Xiao-Shui Li
State Key Laboratory of Biogeology and Environmental Geology, China University of Geosciences, Wuhan 430074, China
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Yu-Han Fan;
Yu-Han Fan
State Key Laboratory of Biogeology and Environmental Geology, China University of Geosciences, Wuhan 430074, China
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Shou-Wen Zhang;
Shou-Wen Zhang
State Key Laboratory of Biogeology and Environmental Geology, China University of Geosciences, Wuhan 430074, China
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Shi-Hua Qi
State Key Laboratory of Biogeology and Environmental Geology, China University of Geosciences, Wuhan 430074, China
E-mail: shihuaqi@cug.edu.cn
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Water Sci Technol (2017) 75 (6): 1399–1409.
Article history
Received:
August 11 2016
Accepted:
December 16 2016
Citation
Xiao-Shui Li, Yu-Han Fan, Shou-Wen Zhang, Shi-Hua Qi; Enhanced adsorption removal of anionic dyes via a facile preparation of amino-functionalized magnetic silica. Water Sci Technol 23 March 2017; 75 (6): 1399–1409. doi: https://doi.org/10.2166/wst.2017.009
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