Green Photocatalytic Oxidation of Benzyl Alcohol over Noble-Metal-Modified H₂Ti₃O₇ Nanowires

Abstract

One-dimensional H2Ti3O7 nanowires (NWs) supported by Au, Ag, and Pd monometallic nanoparticles (NPs) and Au–Pd bimetallic NPs were prepared and used for photochemical benzyl alcohol oxidation. Techniques, such as XRD, TEM, XPS, N2 physisorption, and diffuse reflectance ultraviolet–visible (DRUV–vis), were used to characterize the obtained catalysts. These results showed that the Pd/H2Ti3O7 NWs catalyst under light irradiation displayed an enhanced photocatalytic performance, nearly 2.6 times higher than that for the catalyst without irradiation and about 1.5 times higher than that for Pd/TiO2(P25) with irradiation. The enhanced benzyl alcohol oxidation activity for Pd/H2Ti3O7 NWs might be due to the favorable synergetic effect between Pd and H2Ti3O7 NWs. Particularly, highly dispersed Pd NPs with about 10.2 nm on H2Ti3O7 NWs can promoted the light harvesting ability. The well-matched contact boundary between H2Ti3O7 NWs and Pd NPs might promote separation for the photoinduced electron and hole pairs. After 5 recycle utilization cycles, there was no evident decline in activity and selectivity for the Pd/H2Ti3O7 NWs catalyst, which still maintained its original structure of H2Ti3O7 NWs. The current study provides a potential application in the green and highly efficient photocatalytic synthesis of other organic compounds and other environmental applications.

The photocatalytic NO-removal activity of g-C3N4 significantly enhanced by the synergistic effect of Pd0 nanoparticles and N vacancies

“…Meanwhile, two strong new peaks at around 335.0 and 340.2 eV appeared in the Pd 3d spectrum of Pd-CN-C. These two new peaks corresponded to the 3d 5/2 and 3d 3/2 of zero-valent Pd, [33][34][35] suggesting that Pd 2+ ions were reduced to the zero-valent Pd Environmental Science: Nano Paper during calcination under argon gas (Fig. 2d).…”

Au-Pd nanoparticles immobilized on TiO2 nanosheet as an active and durable catalyst for solvent-free selective oxidation of benzyl alcohol

“…Selective oxidation of alcohols to aldehydes is a crucial reaction in both laboratory and industry. Aldehydes are critical chemical intermediates for the production of pharmaceuticals, fragrances, plastics, and fine chemicals et al [1,2]. The traditional processes for benzaldehyde production involved chromates, permanganates, and peroxides together with organic solvents, which are not only expensive but also environmentally-unfriendly [3].…”

Few-Layered Phosphorene–Graphitic Carbon Nitride Nanoheterostructure as a Metal-Free Photocatalyst for Aerobic Oxidation of Benzyl Alcohol and Toluene

“…17−19 Several nanocomposites such as TiO 2 /Bi 2 MoO 6 and Pd/H 2 Ti 3 O 7 have been reported as effective photocatalysts to enhance the oxidation efficiency of aromatic alkanes. 20,21 The visible-lightdriven photocatalysts like Au and Pd nanoparticles and metal sulfide-based photocatalysts have also been developed for C− H bond oxidation with low to moderate conversion rates. 22 However, photocatalysis with noble or non-noble metals and metal oxides as the major component suffers from high cost, limited availability, and adverse environmental effect.…”