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论文类型：期刊论文
发表时间：2018-01-01
发表刊物：Journal of colloid and interface science
收录刊物：PubMed、SCIE
卷号：528
页面范围：45-52
ISSN号：1095-7103
关键字：Metal-organic frameworks; Volatile organic compounds; Hollow carbon materials; Co/N co-doped; Photocatalyst
摘要：In this work, the hollow Co/N co-doped carbon frameworks (Co/N-C) were successfully constructed by in situ transformation of zeolitic imidazolate frameworks (ZIF-67) through polycondensation of dopamine. The hollow and porous structure of Co/N-C was demonstrated by transmission electron microscopy (TEM). The doping and Co-N-C active sites were verified by X-ray photoelectron spectroscopy (XPS). The UV-vis diffusion reflectance spectra (UV-vis DRS) of hollow Co/N-C nanoparticles reflected a significant enhancement of optical absorption in the range of 300-800 nm. With hollow porous structure, strong optical absorption and rich Co-N-C active sites, the Co/N-C exhibited a high photocatalytic performance by using gaseous toluene as a model pollutant, and the degradation efficiency of gaseous toluene was found to be around 78.2% under mild conditions (i.e., Temperature = 273 K, Pressure = 1 atom, lambda ≥ 420 nm, t = 6 h). The photocatalytic degradation process and mechanism of toluene were further investigated by in situ Fourier transform infrared (FTIR) spectroscopy, which indicated that multiple hydroxylation and benzen ring opening are both involved in the catalytic elimination processes, and the initial intermediate species including benzaldehyde and benzoic acid were firstly derived from the hydroxylation due to the hydroxyl radical followed by further oxidation into carbon dioxide and water. Copyright © 2018 Elsevier Inc. All rights reserved.