Details

Autor(en) / Beteiligte

• Sivakumar, Radhakrishnan
• Park, Kiseong
• Thomas, Jesty
• Yoon, Seok Min
• Yoon, Minjoong

Titel

Solar catalytic CO2 reduction over POM-entrapped zeolites decorated with TiO2 nanocomposites in water: Highly efficient and selective production of CH3OH via Z-scheme charge separation

Ist Teil von

• Journal of environmental chemical engineering, 2024-04, Vol.12 (2), p.112052, Article 112052

Ort / Verlag

Elsevier Ltd

Erscheinungsjahr

2024

Quelle

Alma/SFX Local Collection

Beschreibungen/Notizen

• Polyoxometalate (POM)-entrapped zeolite Y decorated with AgNTiO2 nanocomposies (AgNTiO2 @POM-Zeolite) were fabricated as inorganic co-photocatalytic systems, and their structures were characterized by XRD, FESEM, TEM, XPS, DRS, and ICPAES analysis. The incident-photon-to-electron conversion efficiency (IPCE) of the thin film of AgNTiO2 @POM-Zeolite was observed to be higher than that of AgNTiO2-POM to confirm the photoinduced charge separation between AgNTiO2 and POM across the zeolites, and its action spectrum was shifted toward longer wavelength to be resolved into two bands as the optical absorption spectrum. The photocatalytic water splitting by AgNTiO2 @POM-Zeolite was also observed to produce O2 with a negligible amount of H2 in contrast to inefficient water splitting by zeolite-free AgNTiO2 nanochains or AgNTiO2-POM, indicating that zeolite plays important role in facile transportation of protons. These results imply that the AgNTiO2 @POM-Zeolite is totally inorganic artificial photosynthetic system for the proton-assisted Z-scheme electron transport between AgNTiO2 nanochains and POM across zeolite surface via stepwise excitation with two visible lights. Accordingly, under simulated solar illumination, the photocatalytic reduction of CO2 in water was observed to show over 95% selectivity of CH3OH and O2 production with much higher conversion rate (240μmol/g cat/h) than ever reported. The newly designed photocatalysts are useful for highly efficient production of solar chemical fuels as well as mitigation of CO2. [Display omitted] •POM-entrapped zeolite (POM-zeolite) were fabricated by in-situ methods.•AgNTiO2 nanochains were decorated on the surface of POM-zeolite as solar catalyst.•Solar catalytic CO2 reduction to CH3OH and water splitting was examined.•The production of CH3OH showed high selectivity and superior rate (240 μmol/gcat/h).•The zeolite hybrid is a sustainable artificial photosynthetic system for CO2-mitigation.