Visible-light-activated N-doped CQDs/g-C3N4/Bi2WO6 nanocomposites with different component arrangements for the promoted degradation of hazardous vapors

• 来源期刊: 材料科学技术（英文版）
• 年，卷（期）: 2020,（5）
• 页码范围: 168-175
• 页数: 8页
• 语种: 英文

摘要

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-C3 N4 (CN),and Bi2WO6 (BWO) (hereafter referred to as NCQDs/CN/BWO),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.