Abstract
Nitrogen-doped porous carbon (ZC) is prepared by modification with ammonia for increasing the specific surface area and surface polarity after carbonization of zeolite imidazole framework-8 (ZIF-8). The structure and properties of these ZCs were characterized by Transmission electron microscopy, X-ray diffraction, N2 sorption, X-ray photoelectron spectroscopy and Fourier transform infrared spectroscopy. Through static adsorption tests of these carbons, the sample obtained at 600 °C was selected as an excellent adsorbent, which exhibited an excellent acetone capacity of 417.2 mg g−1 (25 °C) with a very large surface area and high-level nitrogen doping (13.55%). The microporosity, surface area and N-containing groups of the materials, pyrrolic-N, pyridinic-N, and oxidized-N groups in particular, were found to be the determining factors for acetone adsorption by means of molecular simulation with density functional theory. These findings indicate that N-doped microporous carbon materials are potential promising adsorbents for acetone.
Highlights
The emission of volatile organic compounds (VOCs) vapors has caused serious air pollution and a large loss of valuable chemicals [1,2,3,4]
The metal-organic frameworks (MOFs) have been used as a template and/or precursor to prepare porous carbon materials with novel structures and chemical properties, such as high surface area, large pore volume, tunable pore size and high content of heteroatoms [3,18,19], So far, a variety of MOFs, such as zeolite imidazole framework-8 (ZIF-8) [18,20], Al-PCP [21], and MOF-5 [19,22]
The slight differences observed in the surface morphology of ammonia treated with ZIF-derived N-doped porous carbon (ZC) may be possibly attributed to reaction of NH3 with the carbon species, and the ammonia-treated ZC samples show different morphologies depending on the temperature
Summary
The emission of volatile organic compounds (VOCs) vapors has caused serious air pollution and a large loss of valuable chemicals [1,2,3,4]. A wide variety of adsorbents have been explored for VOCs adsorption, including activated carbon [7,8], silica [9], carbon nanotubes [10] and metal-organic frameworks (MOFs) [11]. Among these adsorbents, porous carbon materials have enormous commercial potential due to their easy-to-control pore structures, larger surface areas, and good chemical/thermal stability in production and regeneration. The synergistic effects of nitrogen-containing surface functional groups of porous carbon on its acetone adsorption properties were investigated
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