DOI: 10.1016/j.jcou.2017.02.004
Scopus记录号: 2-s2.0-85012885987
论文题名: g-C3N4/(Cu/TiO2) nanocomposite for enhanced photoreduction of CO2 to CH3OH and HCOOH under UV/visible light
作者: Adekoya D.O. ; Tahir M. ; Amin N.A.S.
刊名: Journal of CO2 Utilization
ISSN: 22129820
出版年: 2017
卷: 18 语种: 英语
英文关键词: CO2 photoreduction
; Formic acid
; g-C3N4-TiO2 nanocomposites
; Methanol
; Visible light
Scopus关键词: Carbon
; Carbon dioxide
; Efficiency
; Electromagnetic wave absorption
; Electronic structure
; Energy gap
; Formic acid
; Irradiation
; Light absorption
; Methanol
; Nanocomposites
; Photocatalysts
; Titanium dioxide
; Titanium nitride
; Adsorption desorption
; Graphitic carbon nitrides
; Photo-reduction
; Photocatalytic systems
; Photogenerated electrons
; Visible light
; Visible light absorption
; Visible-light irradiation
; Light
英文摘要: Graphical abstract: Cu-modified graphitic carbon nitride (g-C3N4) and titanium dioxide (TiO2) nanocomposites for enhanced photocatalytic CO2 reduction with H2O under UV and visible light irradiations have been investigated. The photocatalysts, prepared by pyrolysis and impregnation were characterized by XRD, FE-SEM, TEM, FT-IR, N2 adsorption-desorption, XPS, UV-vis DRS and PL spectroscopy. The Cu-metal loaded over TiO2 and g-C3N4 enhanced CO2 reduction efficiency to CH3OH and HCOOH by fostering carrier charge separation. The Cu-metal in the composite as well as the wt.% ratio of g-C3N4 and TiO2 also influenced the photoactivity and products selectivity. The low band gap, electronic structure and visible light absorption capacity of g-C3N4 facilitated the transfer of photo-generated electrons to Cu/TiO2 in the composite. Moreover, the position of the metal in the composite affected the electrons distribution and hence enhanced the photoactivity. The maximum yield of the products detected under visible light were 2574 and 5069μmol/g.cat of CH3OH and HCOOH, respectively. The yield of CH3OH under visible light was four fold higher compared to UV-light irradiation. The ratio (30:70) of g-C3N4 and Cu/TiO2 in the composite and the use of visible light improved the efficiency of the photocatalytic system. The stability of the photocatalyst prevailed in continuous CH3OH production under visible light irradiation compared to UV-light in cyclic runs. Possible reaction mechanisms were proposed to understand the movement of electrons and holes and the function of both UV and visible light for CO2 reduction over the g-C3N4/TiO2 (30:70) photocatalyst. © 2017 Elsevier Ltd. 资助项目: Ministry of Higher Education
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/52773
Appears in Collections: 影响、适应和脆弱性
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Recommended Citation:
Adekoya D.O.,Tahir M.,Amin N.A.S.. g-C3N4/(Cu/TiO2) nanocomposite for enhanced photoreduction of CO2 to CH3OH and HCOOH under UV/visible light[J]. Journal of CO2 Utilization,2017-01-01,18