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Facile Fabrication of N‑Doped Magnetic Porous Carbon for Highly Efficient Mercury Removal

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journal contribution
posted on 12.07.2018, 00:00 by Lijin Huang, Man He, Beibei Chen, Bin Hu
N-doped magnetic porous carbon (N-MPC) is an emerging adsorbent for water pollution control. However, high cost and multisteps procedure make the direct fabrication of N-MPCs difficult until now. Herein, highly dispersed N-MPCs were synthesized by a facial one-pot solid-state pyrolysis strategy. Heating the mixture of ZnO, Co­(OH)2, and 2-methylimidazole (HmIm), Zn/Co bimetallic ZIFs formed at the initial stages, being the primary self-template to produce N-MPCs during subsequent high-temperature treatment. By altering the pyrolysis temperature and the molar ratio of ZnO/Co­(OH)2 in the precursor, the magnetism, nitrogen content, and surface areas of N-MPCs can be easily controlled. Due to its high special surface areas and the decoration of abundant nitrogen functional groups (pyrrole-N and pyridinic-N), the optimized N-MPC-700-7/3 exhibited a superior adsorption performance for Hg2+ uptake (489 mg g–1). Moreover, the N-MPCs exhibited fast dynamics in adsorption (K2 = 0.47 g mg–1 min–1) and good chemical stability. The simple, sustainable, and impressive method provides an attractive way to manufacture efficiency MPC sorbents, and the prepared N-MPCs merit good application potential in environmental remediation.