Studies of the optical properties and catalytic capabilities noble metal nanoparticles (NPs), such as gold (Au) silver (Ag), have formed basis for very recent fast expansion field green photocatalysis: photocatalysis utilizing visible ultraviolet light, a major part solar spectrum. The reason this growth is recognition that localised surface plasmon resonance (LSPR) effect Au NPs Ag can couple light flux to conduction electrons NPs, excited enhanced electric fields in close proximity...

The intrinsic catalytic activity of palladium (Pd) is significantly enhanced in gold (Au)-Pd alloy nanoparticles (NPs) under visible light irradiation at ambient temperatures. NPs strongly absorb and efficiently enhance the conversion several reactions, including Suzuki-Miyaura cross coupling, oxidative addition benzylamine, selective oxidation aromatic alcohols to corresponding aldehydes ketones, phenol oxidation. Au/Pd molar ratio has an important impact on performance catalysts since it...

Shedding light: Nitroaromatic compounds on gold nanoparticles (3 wt %) supported ZrO2 can be reduced directly to the corresponding azo when illuminated with visible light or ultraviolet at 40 °C (see picture). The process occurs high selectivity and ambient temperature pressure, enables selection of intermediates that are unstable in thermal reactions. Detailed facts importance specialist readers published as ”Supporting Information”. Such documents peer-reviewed, but not copy-edited...

Supported nanoparticles (NPs) of nonplasmonic transition metals (Pd, Pt, Rh, and Ir) are widely used as thermally activated catalysts for the synthesis important organic compounds, but little is known about their photocatalytic capabilities. We discovered that irradiation with light can significantly enhance intrinsic catalytic performance these metal NPs at ambient temperatures several types reactions. These strongly absorb mainly through interband electronic transitions. The excited...

We report herein highly efficient photocatalysts comprising supported nanoparticles (NPs) of gold (Au) and palladium (Pd) alloys, which utilize visible light to catalyse the Suzuki cross-coupling reactions at ambient temperature. The alloy NPs strongly absorb light, energizing conduction electrons produce energetic surface sites. energized activates substrates these particles exhibit good activity on a range typical reaction combinations. photocatalytic efficiencies depend Au : Pd ratio NPs,...

Going down the tubes: The rapid uptake of 137Cs+ ions in sodium trititanate nanofibers (T3NF; see picture) and nanotubes (T3NT) triggers a phase transition or deformation thin titanate layers. Ag2O nanocrystals (5–10 nm) were bound to surface nanostructures efficiently captured I− anions (ca. 4.5 mmol per gram sorbent) from aqueous solutions by forming an AgI precipitate on titanates. Detailed facts importance specialist readers are published as ”Supporting Information”. Such documents...

Palladium (Pd)-catalyzed cross-coupling reactions are among the most important methods in organic synthesis. We report discovery of highly efficient and green photocatalytic processes by which reactions, including Sonogashira, Stille, Hiyama, Ullmann, Buchwald–Hartwig can be driven with visible light at temperatures slightly above room temperature using alloy nanoparticles gold Pd on zirconium oxide, thus achieving high yields. The absorb light, their conduction electrons gain energy, is...

Finely control of product selectivity is an essential issue in organic chemical production. In the synthesis functionalized anilines via reduction corresponding nitroarenes, challenge to selectively reduce only nitro group presence other reducible functional groups nitroarene molecules at a high reaction rate. Normally, reduced stepwise through series intermediates that remain as byproducts, increasing aniline cost. Here we report alloying small amounts copper into gold nanoparticles can...

Photocatalytic synthesis using visible light is a desirable chemical process because of its potential to utilize sunlight. Supported gold nanoparticles (Au-NPs) were found be efficient photocatalysts and the effects supports identified including CeO2, TiO2, ZrO2, Al2O3, zeolite Y. In particular Au/CeO2 exhibited high catalytic activity reduce nitro-aromatics azo compounds, hydrogenate azobenzene hydroazobenzene, ketones alcohols, deoxygenate epoxides alkenes at ambient temperatures, under...

Selective oxidation of aliphatic alcohols under mild and base-free conditions is a challenging process for organic synthesis. Herein, we report one-pot the direct oxidative esterification that significantly enhanced by visible-light irradiation at ambient temperatures. The new methodology uses heterogenerous photocatalysts gold–palladium alloy nanoparticles on phosphate-modified hydrotalcite support molecular oxygen as benign oxidant. can absorb incident light, light-excited metal electrons...

Gold nanoparticles supported on CeO(2) were found to be efficient photocatalysts for three selective reductions of organic compounds at ambient temperatures, under irradiation visible light; their reduction ability can tuned by manipulating the wavelength.

Selective epoxidation of various alkenes with molecular oxygen (O2) under mild conditions is a longstanding challenge in achieving syntheses epoxides. Cu-based catalysts have been found to be catalytically active for selective epoxidations. However, the application copper nanoparticles (CuNPs) photocatalyzed epoxidations encumbered by instability CuNPs air. Herein we report that supported on titanium nitride (TiN) without additional stabilizers not only are stable air but also can catalyze...

Here we report a class of photocatalysts: mixed-valence vanadium oxide particles grafted onto variety supports. In these catalysts V6O13 species with mixed oxidation states (V4+ or V5+) are believed to be catalytically active sites. These successfully enable alcohol selectively produce aldehydes and ketones using O2 as the oxidant. The catalytic process is driven by visible light irradiation at room temperature and, most importantly, progresses negligible overoxidation. can even oxidize...

Production of 2,5-furandicarboxylic acid (FDCA, a platform chemical for the industry in future) by selective aerobic oxidation 5-hydroxymethyl-furfural is crucial component to enable FDCA production from sugars. The challenge achieve high yield at low temperatures. Here, we report catalyst composed alloyed nanoparticles (containing 1.5 wt % Ag and Pd) supported on CeO2 nanofibers, which achieved an excellent (93%) 20 °C. Interesting observations include deterioration higher reaction...

Angestrahlt: Nitroarene auf Goldnanopartikeln (3 Gew.-% einem ZrO2-Träger) werden direkt zu den entsprechenden Azoverbindungen reduziert, wenn sie bei 40 °C mit sichtbarem oder ultraviolettem Licht bestrahlt (siehe Bild). Die Reaktion verläuft hoch selektiv Umgebungstemperatur und -druck ermöglicht die Selektion von Intermediaten, thermischen Reaktionen instabil sind. Detailed facts of importance to specialist readers are published as "Supporting Information". Such documents peer-reviewed,...

We find that visible light irradiation of gold–palladium alloy nanoparticles supported on photocatalytically inert ZrO2 significantly enhances their catalytic activity for oxidant-free dehydrogenation aromatic alcohols to the corresponding aldehydes at ambient temperatures. Dehydrogenation is also dominant process in selective oxidation with molecular oxygen. The strongly absorb and exhibit superior photocatalytic when compared either pure palladium or gold nanoparticles. Analysis a free...

The direct hydroamination of alkynes driven by visible light can be achieved in high yield and selectivity at ambient temperature using supported gold nanoparticles (AuNPs) as photocatalysts. Aniline molecules interact with activated AuNPs meanwhile could active sites on the support. findings reveal a new green approach for synthesis fine organic compounds provide insight into catalyst design activation CC triple bonds amines.

Iodine radioisotopes are released into the environment by nuclear industry and medical research institutions using radioactive materials. The 129I− anion is one of more mobile species due to a long half-life, it great challenge design long-term management solutions for such waste. In this study, new adsorbent structure with potential efficiently remove iodine anions (I−) from water devised: silver oxide (Ag2O) nanocrystals firmly anchored on surface titanate nanotubes nanofibers via coherent...

Nanofibers of sodium vanadate, consisting very thin negatively charged layers and exchangeable ions between the layers, are efficient sorbents for removal radioactive 137Cs+ 85Sr2+ cations from water. The exchange or with interlayer Na+ eventually triggered structural deformation trapping in nanofibers. Furthermore, when nanofibers were dispersed a AgNO3 solution at pH >7, well-dispersed Ag2O nanocrystals formed by firmly anchoring themselves on fiber surfaces along planes crystallographic...

Product selectivity of alkyne hydroamination over catalytic Au2 Co alloy nanoparticles (NPs) can be made switchable by a light-on/light-off process, yielding imine (cross-coupling product aniline and alkyne) under visible-light irradiation, but 1,4-diphenylbutadiyne in the dark. The low-flux light irradiation concentrates on catalyst, accelerating cross-coupling several orders magnitude even at very low overall concentrations (1.0×10-3 mol L-1 ). A tentative mechanism is that NPs absorb...

Abstract Metal nanoparticles (NPs) have emerged as a kind of new photocatalyst to drive various chemical reactions by visible‐light irradiation. A distinct advantage metal NP photocatalysts is that their light absorption not limited certain wavelength but instead they are able utilize broad range wavelengths, constituting large fraction the solar spectrum. NPs like gold, silver, and copper can strongly absorb visible due localized surface plasmon resonance (LSPR) effect. Recent developments...