期刊
JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY
卷 40, 期 -, 页码 168-175出版社
JOURNAL MATER SCI TECHNOL
DOI: 10.1016/j.jmst.2019.09.026
关键词
Component arrangement; Charge-transfer route; NCQDs dual role; Charge mediator; Upconversion photoluminescence
资金
- National Research Foundation of Korea (NRF) - Korea government (MSIP) [2016R1A2B4009122, 2017R1A4A1015628]
To investigate whether the arrangement of componentsin multi-composite photocatalysts may affect their photocatalytic properties, due to different charge-transfer routes, two ternary-nanocomposite photocatalysts with different component arrangements, comprising N-doped carbon quantum dots (NCQDs), g-C3N4 (CN), and Bi2WO6 (BWO) (hereafter referred to as NCQDs/CNIBWO), were developed, and the photocatalytic degradation of model hazardous vapors under visible-light illumination was investigated. Type I NCQDs/CN/BWO, which was developed by the combination of NCQDs/BWO and CN, exhibited photocatalytic ability superior to that of type II NCQDs/CN/BWO, which was developed by the combination of CN/BWO and NCQDs; the superior photocatalytic ability corresponded to the dual properties of NCQDs: charge mediation and upconversion photoluminescence. Moreover, the photocatalytic ability of NCQDs/CN/BWO was greater than those of the reference catalysts; in addition, this photocatalyst exhibited outstanding photochemical stability. Additionally, the effects of CN/(BWO + CN) weight ratio of the CN/BWO dual nanocomposites and the NCQDs/(BWO + CN + NCQDs) weight percentage of NCQDs/CN/BWO ternary nanocomposites on the pollutant removal efficiency were investigated. The plausible mechanisms over the two NCQDs/CN/BWO photocatalysts for the degradation of hazardous vapors were discussed. The component arrangement approach proposed herein afforded a technique toward the perceptive development of novel multi-component heterostructures for the photocatalytic degradation of hazardous vapors. (C) 2019 Published by Elsevier Ltd on behalf of The editorial office of Journal of Materials Science & Technology.
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