A facile sulfur-assisted method to synthesize porous alveolate Fe/g-C3N4 catalysts with ultra-small cluster and atomically dispersed Fe sites
发布时间：2020-07-06
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- 论文类型：
- 期刊论文
- 发表时间：
- 2020-08-01
- 发表刊物：
- CHINESE JOURNAL OF CATALYSIS
- 收录刊物：
- SCIE
- 文献类型：
- J
- 卷号：
- 41
- 期号：
- 8
- 页面范围：
- 1198-1207
- ISSN号：
- 0253-9837
- 关键字：
- Sulfur-assisted synthesis; Porous alveolate structure; Ultra-small cluster and atomically dispersed active sites; Fe/g-C3N4; Advanced oxidation processes
- 摘要：
- Heterogeneous catalysts with ultra-small clusters and atomically dispersed (USCAD) active sites have gained increasing attention in recent years. However, developing USCAD catalysts with high-density metal sites anchored in porous nanomaterials is still challenging. Here, through the template-free S-assisted pyrolysis of low-cost Fe-salts with melamine (MA), porous alveolate Fe/g-C3N4 catalysts with high-density (Fe loading up to 17.7 wt%) and increased USCAD Fe sites were synthesized. The presence of a certain amount of S species in the Fe-salts/MA system plays an important role in the formation of USCAD S-Fe-salt/CN catalysts; the S species act as a "sacrificial carrier" to increase the dispersion of Fe species through Fe-S coordination and generate porous alveolate structure by escaping in the form of SO2 during pyrolysis. The S-Fe-salt/CN catalysts exhibit greatly promoted activity and reusability for degrading various organic pollutants in advanced oxidation processes compared to the corresponding Fe-salt/CN catalysts, due to the promoted accessibility of USCAD Fe sites by the porous alveolate structure. This S-assisted method exhibits good feasibility in a large variety of S species (thiourea, S powder, and NH4SCN) and Fe salts, providing a new avenue for the low-cost and large-scale synthesis of high-density USCAD metal/g-C3N4 catalysts. (C) 2020, Dalian Institute of Chemical Physics, Chinese Academy of Sciences. Published by Elsevier B.V. All rights reserved.
- 第一作者
- An, Sufeng
- 合写作者
- Miller, Jeffrey T.,Song, Chunshan,Liu, Jiaqiang,Li, Keyan,Wan, Gang,Liang, Yan,Ji, Donghui,Liu, Wei,Liu, Zhongmin,Guo, Xinwen,Zhang, Guanghui
- 通讯作者
- Li, KY; Guo, XW (reprint author), Dalian Univ Technol, Sch Chem Engn, PSU DUT Joint Ctr Energy Res, State Key Lab Fine Chem, Dalian 116024, Liaoning, Peoples R China.