Z-Scheme Bi/Bi₂O₂CO₃/Layered Double-Hydroxide Nanosheet Heterojunctions for Photocatalytic CO₂ Reduction under Visible Light

Abstract

A Z-scheme Bi2O2CO3/Bi/NiAl-LDH (BBOC/LDH) nanosheet heterojunction was fabricated by a hydrothermal method. The BBOC/LDH composites exhibited superior performance for photocatalytic CO2 reduction. A maximum yield of CH4 with the value of 56.64 μmol/gcat was achieved on 20%BBOC/LDH composite, which was 3.9-fold higher than pure LDH. The larger specific surface area, and the efficient separation of photoexcited electrons and holes attributed to the metal Bi SPR effect and Z-scheme heterojunction, enhanced the CO2 photoreduction performance.

Urchinlike W18O49/g-C3N4 Z-Scheme Heterojunction for Highly Efficient Photocatalytic Reduction of CO2 under Full Spectrum Light

“…This process can significantly reduce the charge carrier combination rate and achieve higher photocatalytic efficiency. The process of photoreduction of CO 2 can be described by the following formulas: − …”

A novel S-scheme heterojunction based on 0D/3D CeO2/Bi2O2CO3 for the photocatalytic degradation of organic pollutants

“…The XRD patterns of the synthesized CeO . 29 As shown in Fig. 3d, the high-resolution spectrum of Ce 3d shows three sets of spin-orbit dipole peaks with CeO 2 , where the peaks at 884.5 eV and 902.9 eV can be ascribed to Ce 3+ , which can demonstrate the presence of oxygen vacancies in both CeO 2 and CB-15.…”

Review of Graphitic Carbon Nitride and Its Composite Catalysts for Selective Reduction of CO2

“…Various metal oxides, pnictides, and chalcogenides have been attached onto g-C 3 N 4 in order to fabricate direct Z-scheme heterojunction photocatalyst composites. Oxides such as WO 3 and TiO 2 , Ni and Co-based phosphides, and sulfides such as Bi 2 S 3 and SnS 2 have been successfully conjugated with g-C 3 N 4 to make direct Z-scheme heterojunctions. − Many g-C 3 N 4 based direct Z-schemes have been synthesized for specifically employing in photocatalytic CO 2 reduction reactions. − A composite consisting of WO 3 /g-C 3 N 4 was designed by Ohno and co-workers for photocatalytic CO 2 reduction application, which showed significantly better photocatalytic performance as compared to the bare semiconductor catalysts . A double beam photoacoustic spectroscopy revealed that the heterojunction followed a direct Z-scheme recombination route.…”

“…The composite system showed enhancement of photocatalytic CO 2 reduction capability in terms of both reactivity and selectivity . For quite a long time, bismuth-based photocatalysts have been used in various photochemical transformations, and the CO 2 reduction reaction is no exception. ,− Chalcogenides, oxyhalides, and mixed metal oxides of bismuth have been used generously to fabricate direct Z-scheme heterojunctions with g-C 3 N 4 . Two-dimensional ultrathin nanosheets of BiVO 4 have been effectively coupled with 2D g-C 3 N 4 to construct a heterojunction related to the direct Z-scheme .…”