首页|The hierarchically nitrogenous magnetic porous carbon prepared by ZIF-67 through mesoporous silica-protected calcination for rapid Cr(VI) removal
The hierarchically nitrogenous magnetic porous carbon prepared by ZIF-67 through mesoporous silica-protected calcination for rapid Cr(VI) removal
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NSTL
Elsevier
? 2021 Elsevier Inc.A novel magnetic composite with hierarchically porous nature is prepared by a facile synthetic strategy for the highly toxic chromium (Cr(VI)) removal. The magnetic NMPC@mSiO2 with defined mesoporous shell is successfully fabricated by one-step carbonization of ZIF-67@mSiO2, which is prepared through a simple one-pot method. Benefiting from the protection of mSiO2 during pyrolysis process, NMPC@mSiO2-800 owns high specific surface area, hierarchically porous structure and increased C–N content. It shows an excellent Cr(VI) removal performance with an adsorption capacity rising to 158.11 mg·g?1 from 78.60 mg·g?1 (NMPC-800). Moreover, the prepared NMPC@mSiO2-800 exhibits antijamming capability for Cl?1/SO42? with a negligible adverse impact on Cr(VI) removal. The kinetic studies show that the Cr(VI) removal on NMPC@mSiO2-800 confirms to pseudo-second-order model equipped with a relatively large adsorption rate constant, revealing the ability to quickly adsorb Cr(VI). The thermodynamic parameters manifest Cr(VI) adsorption is spontaneous and endothermic. Besides, the NMPC@mSiO2-800 can be quickly recovered from the system due to the magnetic porous carbon. Herein, NMPC@mSiO2-800 has a broad application prospect in Cr(VI) removal due to its excellent adsorption capacity, good antijamming ability, high adsorption rate and easy magnetic separation.
NSTL
Elsevier
