Assemblies of nanoparticles of CeO2–ZnTi-LDHs and their derived mixed oxides as novel photocatalytic systems for phenol degradation

Harnessing self-supported Au nanoparticles on layered double hydroxides comprising Zn and Al for enhanced phenol decomposition under solar light

“…p-benzoquinone/hydroquinone as primary intermediate species [36,39]. The peaks at 246, 263, 270, 275, and 289 nm were reported to appear in the UV absorption region for p-benzoquinone, trans-muconic acid, phenol, catechol, and hydroquinone [36,40] and in fact confirmed for 4.3-74 ppm of standard aqueous solutions (Fig.…”

“…Thus in the proposed reaction path for the second group, in addition to initial indirect ring opening via p-benzoquinone based on the 248-nm peak maximum at 20-40 min from the start of irradiation ( Fig. 8B-a, e-g), the oxidation of catechol to o-benzoquinone and the direct opening of the aromatic ring of o-benzoquinone to muconic acid also occurred [36]:…”

“…The temperature was kept constant at 298 K. After 30 min in darkness to ensure the adsorption equilibrium of phenol on the catalyst, the reactor was irradiated The peaks in the UV-visible spectra at 197 nm, 210 nm, 248 nm, and 270 nm were assigned to π-π* and n-π* transition for aromatic ring [35], p-benzoquinone, and phenol [36], respectively, and the spectra were deconvoluted using the four Gaussian peaks as follows:…”

Facile synthesis of mesoporous hierarchical Co3O4–TiO2 p–n heterojunctions with greatly enhanced gas sensing performance

“…Much attention has been paid to LDH because of their adjustable chemical composition, anion exchange ability, tunable charge density, and multifuntionalities, and they have been widely used in the fields of catalysis, optics, electrochemistry, adsorption, anion exchange, and polymer additives. [36][37][38][39][40] LDH have already been used as precursors to prepare different kinds of mixed metal oxides, [41][42][43] however, to the best of our knowledge, they are seldom adopted to fabricate p-n heterojunctions.…”

Layered Double Hydroxide Materials in Photocatalysis

“…The ZnAlIn-MMO nanocomposites with the band gaps in the range 2.50-2.60 eV display enhanced visible-light-driven photocatalytic activity for the degradation of MB compared with single-phased In 2 O 3 . Seftel et al [39] also reported a similar MMO heterostructure system consisting of nano-sized coupled ZnO/SnO 2 composite synthesized by the calcination of LDH precursors. This ZnO/SnO 2 MMO composite exhibits enhanced photocatalytic performance than the physic mixture of the two semiconductor oxides for the degradation of methyl orange (MO) dye.…”