Au/CeO(2) samples with various Au contents were prepared by the multistep (MS) photodeposition method. Their properties including particle size, dispersion, and photoabsorption investigated compared of using single-step (SS) The MS- SS-Au/CeO(2) used for selective oxidation benzyl alcohols to corresponding benzaldehydes in aqueous suspensions under irradiation visible light from a green LED, correlations between reaction rates physical investigated. Difference two methods was reflected...

Titanium(IV) oxide (TiO2) having both small platinum (Pt) nanoparticles and large gold (Au) particles without alloying nanoparticle coagulation was successfully prepared by the combination of traditional photodeposition Pt in presence a hole scavenger (PH) subsequent Au colloid (CPH) onto TiO2–Pt. an average diameter 13 nm were fixed on TiO2 TiO2–Pt samples change original size particles, Au/TiO2 Au/TiO2–Pt exhibited strong photoabsorption around 550 as result surface plasmon resonance (SPR)...

Photocatalytic H2 and O2 formations under visible light irradiation (λ > 400 nm) are demonstrated using Pt-Au nanopaticles for the reduction site WO3 oxidation in solid-state Pt/Au/WO3.

Nanocrystalline anatase titanium(IV) oxide (TiO2) particles were synthesized by hydrothermal crystallization in organic media (HyCOM) followed calcination at various temperatures up to 1273 K, and they characterized analysis of surface adsorption the substrates, as well X-ray diffraction (XRD) Brunauer−Emmet−Teller (BET) area measurements. These HyCOM TiO2 samples used for three kinds photocatalytic reactions: mineralization acetic acid (AcOH) aerated aqueous suspensions, dehydrogenation...

The molar amounts of defective sites (Md) in several titanium(IV) oxide (TiO2) powders were determined using photoinduced reactions electron accumulation deaerated aqueous solutions containing sacrificial hole scavengers and subsequent reduction methylviologen to its cation radical. Measurements pH dependence typical anatase rutile TiO2 showed that these electronic energy just below the conduction band edge ranges 0–0.35 V for 0–0.25 rutile. A linear relation Md with rate constant...

Gold nanoparticles supported on cerium(IV) oxide powder showed strong absorption at around 550 nm due to localized surface plasmon resonance of Au and exhibited a higher level activity than other Au-supporting samples in mineralization organic acids aqueous suspensions under irradiation visible light (> ca. 520 nm).

We found that plasmonic Au particles on titanium(<sc>iv</sc>) oxide (TiO₂) act as a visible-light-driven photocatalyst for overall water splitting free from any additives.

A functionalized plasmonic Au/TiO2 photocatalyst with an Ag co-catalyst was successfully prepared by the combination of two types photodeposition methods, and it quantitatively converted nitrobenzene 2-propanol to aniline acetone under irradiation visible light.

Gold nanoparticles supported on cerium(IV) oxide powder showing strong absorption at around 550 nm due to surface plasmon resonance oxidized aromatic alcohols corresponding aldehydes almost quantitatively in an aqueous suspension under irradiation of green light.

Titanium(IV) oxide (TiO2) having both small platinum (Pt) nanoparticles and large gold (Au) particles without alloying nanoparticle coagulation was successfully prepared by the combination of traditional photodeposition Pt subsequent Au colloid onto TiO2–Pt. The Au/TiO2 Au/TiO2–Pt samples exhibiting strong photoabsorption due to surface plasmon resonance (SPR) supported were used for reduction hexavalent chromium (Cr6+ in Cr2O72–) aqueous suspensions under irradiation visible light from a...

Thermal treatment of oxobis(2,4-pentanedionato-O,O′)titanium (TiO(acac)2) in ethylene glycol (EG) the presence sodium laurate and a small amount water at 300 °C was examined. X-Ray diffraction, transmission electron microscopy Raman spectroscopy revealed that microcrystalline brookite-type titanium(IV) oxide (TiO2) having an average size 14 × 67 nm formed this brookite sample not contaminated with other TiO2 phases such as anatase rutile. Sodium salts, TiO(acac)2 titanium source were...

The reaction of a stoichiometric mixture aluminum isopropoxide and yttrium acetate in 1,4‐butanediol at 300°C yielded crystalline garnet having an approximate particle size 30 nm. No other phases were detected. use ethylene glycol place afforded amorphous product.

Photocatalytic reduction of nitrobenzenes to corresponding aminobenzenes in aqueous suspensions titanium(IV) oxide (TiO(2)) containing hole scavengers under various conditions was examined. In photocatalytic m-nitrobenzenesulfonic acid (m-NBS) the presence formic (FA) deaerated conditions, m-aminobenzenesulfonic (m-ABS) produced almost quantitatively acidic and high efficiency (>99%) FA utilization as a scavenger achieved. No re-oxidation m-ABS occurred both absence FA. The yield explained...

Gold (Au) nanoparticles supported on titania (TiO2) and ceria have been applied to a visible-light-responding plasmonic photocatalyst functionalization of Au/TiO2 photocatalysts with cocatalysts were achieved by separate loading Au cocatalyst without alloying nanoparticle coagulation. Here we report effectiveness another formation core–shell structure in photocatalytic reaction induced SPR Au/TiO2. Newly functionalized gold–palladium particles TiO2 (Au@Pd/TiO2) successfully prepared using...

Colloidal gold (Au) nanoparticles were prepared and successfully loaded on titanium(IV) oxide (TiO2) without change in the original particle size using a method of colloid photodeposition operated presence hole scavenger (CPH). The Au supported TiO2 showed strong photoabsorption at around 550 nm due to surface plasmon resonance (SPR) exhibited photocatalytic activity mineralization formic acid aqueous suspensions under irradiation visible light (>ca. 520 nm). A linear correlation between...

A rhodium(III) ion (Rh3+)-modified TiO2 (Rh3+/TiO2) photocatalyst, prepared by a simple adsorption method and exhibiting high levels of photocatalytic activity in degradation organic compounds, was investigated using X-ray absorption fine structure (XAFS) measurements, (photo)electrochemical double-beam photoacoustic (DB-PA) spectroscopic photoluminescence measurements. Based on the results, features Rh3+ modifier working mechanism Rh3+/TiO2 photocatalyst are discussed. XAFS measurements...

Nonoxidative coupling of methane (NOCM) is an attractive reaction for the direct conversion to ethane and hydrogen. Although conventional catalytic NOCM needs high operating temperatures thus suffers from deactivation catalyst by coke formation, a photocatalytic can take place at low temperature, even around room temperature. In present study, gallium oxide photocatalyst with palladium bismuth dual cocatalyst (Pd-Bi/Ga2O3) was found exhibit activity selective NOCM, producing hydrogen upon...

The effect of calcination on photocatalytic activities was studied for highly crystalline TiO2 powder, which synthesized by the method hydrothermal crystallization in organic media (HyCOM). productions O2•-and H2O2 under ambient condition were monitored means luminol chemiluminescence probing. amount produced O2•- decreased with at lower temperatures parallel to decrease inner Ti3+ signal observed 77 K ESR spectroscopy. formation route aerated is mainly two-step O2 reduction presence...

Abstract Pump-probe diffuse reflectance measurements were carried out on particulate titanium(IV) oxide photocatalysts in the form of aqueous suspension and dry powder. A linear relation between second-order rate constants electron-hole recombination for powder systems was seen by analyses decay profile charge carriers. Presence air gave negligible effect kinetics, but loading platinum (Pt) significantly reduced constant.