Roles of N-Vacancies over Porous g-C3N4 Microtubes during Photocatalytic NOx Removal | |
Wang, Zhenyu2,3,5; Huang, Yu2,3; Chen, Meijuan5; Shi, Xianjin2,3; Zhang, Yufei2,3; Cao, Junji2,3,5; Ho, Wingkei4; Lee, Shun Cheng1 | |
刊名 | ACS APPLIED MATERIALS & INTERFACES |
2019-03-20 | |
卷号 | 11期号:11页码:10651-10662 |
关键词 | N-vacancy tubular g-C3N4 porosity photocatalytic NOx removal |
ISSN号 | 1944-8244 |
DOI | 10.1021/acsami.8b21987 |
通讯作者 | Huang, Yu(huangyu@ieecas.cn) |
英文摘要 | The development of catalysts that effectively activate target pollutants and promote their complete conversion is an admirable objective in the environmental photocatalysis field. In this work, graphitic carbon nitride (g-C3N4) microtubes with tunable N-vacancy concentrations were controllably fabricated using an in situ soft-chemical method. The morphological evolution of C3N4 from the bulk to the porous tubular architecture, is discussed in detail with the aid of time-resolved hydrothermal experiments. We found that the NO removal ratio and apparent reaction rate constant of the g-C3N4 microtubes were 1.8 and 2.6 times higher than those of pristine g-C3N4, respectively. By combining detailed experimental characterization and density functional theory calculations, the effects of N-vacancies in the g-C3N4 microtubes on O-2 and NO adsorption activation, electron capture, and electronic structure were systematically investigated. These results demonstrate that surface N-vacancies act as specific sites for the adsorption activation of reactants and photoinduced electron capture, while enhancing the light-absorbing capability of g-C3N4. Moreover, the porous wall structures of the as-prepared g-C3N4 microtubes facilitate the diffusion of reactants, and their tubular architectures favor the oriented transfer of charge carriers. The intermediates formed during photocatalytic NO removal processes were identified by in situ diffuse reflectance infrared Fourier transform spectroscopy, and different reaction pathways over pristine and N-deficient g-C3N4 are proposed. This study provides a feasible strategy for air pollution control over g-C3N4 by introducing N-vacancy and porous tubular architecture simultaneously. |
资助项目 | National Key Research and Development Program of China[2016YFA0203000] ; National Key Research and Development Program of China[2017YFC0212200] ; National Science Foundation of China[41573138] ; National Science Foundation of China[51878644] ; Key Research and Development Program of Shaanxi Province[2018ZDCXL-SF-02-04] ; Hundred Talent Program of the Chinese Academy of Sciences |
WOS关键词 | GRAPHITIC CARBON NITRIDE ; INTERFACIAL CHARGE-TRANSFER ; SELF-SACRIFICIAL SYNTHESIS ; NANOSHEETS ; HETEROJUNCTIONS ; SEPARATION ; COMPOSITE ; OXIDE ; WATER ; TIO2 |
WOS研究方向 | Science & Technology - Other Topics ; Materials Science |
语种 | 英语 |
出版者 | AMER CHEMICAL SOC |
WOS记录号 | WOS:000462260000023 |
资助机构 | National Key Research and Development Program of China ; National Science Foundation of China ; Key Research and Development Program of Shaanxi Province ; Hundred Talent Program of the Chinese Academy of Sciences |
内容类型 | 期刊论文 |
源URL | [http://ir.ieecas.cn/handle/361006/14209] |
专题 | 地球环境研究所_粉尘与环境研究室 第四纪科学与全球变化卓越创新中心 |
通讯作者 | Huang, Yu |
作者单位 | 1.Hong Kong Polytech Univ, Dept Civil & Environm Engn, Hong Kong, Peoples R China 2.CAS Ctr Excellence Quaternary Sci & Global Change, Xian 710061, Shaanxi, Peoples R China 3.Chinese Acad Sci, Inst Earth Environm, Key Lab Aerosol Chem & Phys, SKLLQG, Xian 710061, Shaanxi, Peoples R China 4.Educ Univ Hong Kong, Dept Sci & Environm Studies, Hong Kong, Peoples R China 5.Xi An Jiao Tong Univ, Sch Human Settlements & Civil Engn, Xian 710049, Shaanxi, Peoples R China |
推荐引用方式 GB/T 7714 | Wang, Zhenyu,Huang, Yu,Chen, Meijuan,et al. Roles of N-Vacancies over Porous g-C3N4 Microtubes during Photocatalytic NOx Removal[J]. ACS APPLIED MATERIALS & INTERFACES,2019,11(11):10651-10662. |
APA | Wang, Zhenyu.,Huang, Yu.,Chen, Meijuan.,Shi, Xianjin.,Zhang, Yufei.,...&Lee, Shun Cheng.(2019).Roles of N-Vacancies over Porous g-C3N4 Microtubes during Photocatalytic NOx Removal.ACS APPLIED MATERIALS & INTERFACES,11(11),10651-10662. |
MLA | Wang, Zhenyu,et al."Roles of N-Vacancies over Porous g-C3N4 Microtubes during Photocatalytic NOx Removal".ACS APPLIED MATERIALS & INTERFACES 11.11(2019):10651-10662. |
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