首页|Tetraethylenepentamine-functionalized magnetic mesoporous composites as a novel adsorbent for the removal Cr(Ⅲ)-ethylenediaminetetraacetic acid in complex solution
Tetraethylenepentamine-functionalized magnetic mesoporous composites as a novel adsorbent for the removal Cr(Ⅲ)-ethylenediaminetetraacetic acid in complex solution
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A novel tetraethylenepentamine(TEPA)functionalized magnetic mesoporous silica adsorbent(FNMs/TEPA)was prepared for the adsorption of Cr(Ⅲ)-ethylenediaminetetraacetic acid(EDTA)from wastewater.The characterization of the prepared adsorbent certified that TEPA was modified onto the magnetic mesoporous silicon(FNMs),while FNMs/TEPA maintained the ordered mesoporous and pristine magnetic properties.The batch adsorption experiments demonstrated that TEPA significantly enhanced the removal capacity of the adsorbent for Cr(Ⅲ)-EDTA.FNMs/TEPA exhibited an excellent adsorption property(13.84 mg·g-1)at pH 4.0.Even in the presence of high concentrations of coexisting ions and organic acids,the adsorption performance of FNMs/TEPA was stable.Experimental character-ization and DFT demonstrated that the adsorption of Cr(Ⅲ)-EDTA was ascribed to the electrostatic interaction,hydrogen bonding,and complexation between Cr(Ⅲ)-EDTA and amino groups on the adsorbent surface.The analysis of the independent gradient model(IGM)shows that electrostatic interaction is the main mode of action in the adsorption process.Moreover,FNMs/TEPA demonstrated remarkable reusability in three regeneration cycles.These findings indicated that FNMs/TEPA possessed excellent application prospects in the disposal of wastewater containing Cr(Ⅲ)-EDTA.
TEPA functionalized magnetic mesoporoussiliconAdsorptionCr(Ⅲ)-EDTADensity functional theory calculations
Zhi Hu、Jiahong Wang、Tongtong Sun
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School of Environmental Science and Engineering,Shaanxi University of Science & Technology,Xi'an 710021,China
Shaanxi Key Laboratory of Green Preparation and Functionalization of Inorganic Materials,Xi'an 710021,China
National Natural Science Foundation of ChinaKey Research and Development Program of Shaanxi,China
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