Controllable fabrication of a Cs₂AgBiBr₆ nanocrystal/mesoporous black TiO₂ hollow sphere composite for photocatalytic benzyl alcohol oxidation

Abstract

Photocatalytic selective oxidation of benzyl alcohol into benzaldehyde at normal temperature and pressure is one of important topics in the catalysis field. Here, lead-free double perovskite Cs2AgBiBr6 nanocrystal/mesoporous black TiO2...

Photothermal dependence on catalytic activity and selectivity of HMF and benzyl alcohol oxidation over Pd/1D‐TiO2 nanotubes

“…7. Under the light, Ti‐NTs were excited by light to generate electrons and holes: the electrons were enriched on the surface of Pd nanoparticles and combined with O 2 to form superoxide radical O 2 − , whereas the holes were enriched on the surface of the carrier and combined with the alcohol molecules to form alcohol cationic radical, and finally, the reaction between superoxide radicals and alcohol cationic radical generated benzaldehyde 36,37 . However, benzaldehyde is not the end of the reaction; it likewise continues to be oxidized by photogenerated holes in the system to eventually produce benzoic acid.…”

“…Under the light, Ti-NTs were excited by light to generate electrons and holes: the electrons were enriched on the surface of Pd nanoparticles and combined with O 2 to form superoxide radical O 2 − , whereas the holes were enriched on the surface of the carrier and combined with the alcohol molecules to form alcohol cationic radical, and finally, the reaction between superoxide radicals and alcohol cationic radical generated benzaldehyde. 36,37 However, benzaldehyde is not the end of the reaction; it likewise continues to be oxidized by photogenerated holes in the system to eventually produce benzoic acid. In the absence of an external light source, the first step of benzyl alcohol oxidation is that O nd Based on the data above for photothermal catalysis of benzyl alcohol and photothermal catalysis of HMF, it is clear that under light conditions, the hole oxidation produced by photoexcitation is very strong and easily oxidizes the aldehyde group to the carboxyl group.…”

All-in-one ultrathin nanoporous ZnIn2S4 with ameliorated photoredox capability: harvesting electron–hole pairs in cooperative hydrogen and benzaldehyde production

“…9 Recently, the selective oxidation of benzyl alcohol to its corresponding aldehyde (benzaldehyde) using photogenerated holes has emerged as a potent alternative to the conventional halogen-involving industrial process. [10][11][12][13] However, the use of additional additives (e.g. TEMPO) 14,15 and organic solvents (e.g.…”

Regulating the Active Sites of Cs2AgBiCl6 by Doping for Efficient Coupling of Photocatalytic CO2 Reduction and Benzyl Alcohol Oxidation

“…Among those, all inorganic metal halide double perovskites (Cs 2 AgBiX 6 , X = Cl, Br, I) have recently emerged as remarkable candidate photocatalysts due to their high extinction coefficient, low exciton binding energy, tunable band structure as well as high stability against light, heat and moisture. [20][21][22][23] Moreover, it is known that the Bi in Cs 2 AgBiX 6 can serve as a catalytic site for CO 2 reduction. [24,25] Nevertheless, the photocatalytic performance of Cs 2 AgBiX 6 is largely limited by the serious charge recombination and the lack of efficient catalytic sites for BA oxidation.…”

“…[24,25] Nevertheless, the photocatalytic performance of Cs 2 AgBiX 6 is largely limited by the serious charge recombination and the lack of efficient catalytic sites for BA oxidation. To address such limitations, various strategies, including morphology control, [26,27] construction of heterojunctions, [23] and bandgap tuning [28] have been developed for coupled photocatalysis. However, it is still challenging to simultaneously achieve efficient CO 2 reduction and BA oxidation on the Cs 2 AgBiX 6 .…”