Abstract
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.
基金项目
National Natural Science Foundation of China(22076111)
Key Research and Development Program of Shaanxi,China(2024GX-YBXM-427)
NETL
NSTL
万方数据