Ammonia (NH3) is an essential chemical in modern society. It currently manufactured by the Haber-Bosch process using H2 and N2 under extremely high-pressure (>200 bar) high-temperature (>673 K) conditions. Photocatalytic NH3 production from water at atmospheric pressure room temperature ideal. Several semiconductor photocatalysts have been proposed, but all suffer low efficiency. Here we report that a commercially available TiO2 with large number of surface oxygen vacancies, when...

Photocatalytic production of hydrogen peroxide (H2O2) on semiconductor catalysts with alcohol as a source and molecular oxygen (O2) an is potential method for safe H2O2 synthesis because the reaction can be carried out without use explosive H2/O2 mixed gases. Early reported photocatalytic systems, however, produce significantly low selectivity (∼1%). We found that visible light irradiation (λ > 420 nm) graphitic carbon nitride (g-C3N4), polymeric semiconductor, in alcohol/water mixture O2...

Visible-light irradiation (λ > 450 nm) of gold nanoparticles loaded on a mixture anatase/rutile TiO2 particles (Degussa, P25) promotes efficient aerobic oxidation at room temperature. The photocatalytic activity critically depends the catalyst architecture: Au with <5 nm diameter located interface behave as active sites for reaction. This photocatalysis is promoted via plasmon activation by visible light followed consecutive electron transfer in Au/rutile/anatase contact site. activated...

Abstract Design of green, safe, and sustainable process for the synthesis hydrogen peroxide (H 2 O ) is a very important subject. Early reported processes, however, require palladium‐based catalysts. Herein we propose photocatalytic H driven by metal‐free catalysts with earth‐abundant water molecular oxygen (O as resources under sunlight irradiation ( λ &gt;400 nm). We use graphitic carbon nitride (g‐C 3 N 4 containing electron‐deficient aromatic diimide units Incorporating positively shifts...

Solar-to-chemical energy conversion is a challenging subject for renewable storage. In the past 40 years, overall water splitting into H2 and O2 by semiconductor photocatalysis has been studied extensively; however, they need noble metals extreme care to avoid explosion of mixed gases. Here we report that generating hydrogen peroxide (H2O2) from organic photocatalysts could provide new basis clean storage without metal risk. We found carbon nitride–aromatic diimide–graphene nanohybrids...

TiO2 loaded with Au–Ag bimetallic alloy particles efficiently produces H2O2 from an O2-saturated ethanol/water mixture under UV irradiation. This is achieved via the double effects created by particles. One efficient photocatalytic reduction of O2 on Au atoms promoting enhanced formation, due to separation photoformed electron–hole pairs at alloy/TiO2 heterojunction. Second suppressed decomposition formed decreased adsorption onto atoms.

A new rhodamine derivative (1) containing an ethylenediamine-N,N-diacetic acid moiety exhibits Cu(II)-selective strong green fluorescence, while showing very weak orange fluorescence with other metal cations.

Photocatalytic production of hydrogen peroxide (H2O2) from ethanol (EtOH) and molecular oxygen (O2) was carried out by visible light irradiation (λ > 420 nm) mesoporous graphitic carbon nitride (GCN) catalysts with different surface areas prepared silica-templated thermal polymerization cyanamide. On these catalysts, the photoformed positive hole oxidize EtOH conduction band electrons localized at 1,4-positions melem unit promote two-electron reduction O2 (H2O2 formation). The GCN 56 160 m2...

The design of a safe and sustainable process for the synthesis hydrogen peroxide (H2O2) is very important subject from viewpoint green chemistry. Photocatalytic H2O2 production with earth-abundant water molecular oxygen (O2) as resources an ideal process. A successful system based on organic semiconductor has been proposed; however, it suffers poor photostability. Here we report inorganic photocatalyst synthesis. Visible light irradiation (λ >420 nm) BiVO4 loaded Au nanoparticles (Au/BiVO4)...

Photocatalytic hydrogen peroxide (H2O2) production from water and molecular oxygen (O2) by sunlight is a promising strategy for green, safe, sustainable H2O2 synthesis. We prepared graphitic carbon nitride (g-C3N4) doped with electron-deficient biphenyl diimide (BDI) units simple calcination procedure. The g-C3N4/BDI catalyst, when photoirradiated visible light (λ >420 nm) in pure O2, successfully promotes oxidation the photogenerated valence band holes selective two-electron reduction of O2...

Ammonia (NH3) is an essential chemical in modern society, currently manufactured via the Haber–Bosch process with H2 and N2 under extremely high pressure (>200 bar) high-temperature conditions (>673 K). Toxic nitrate anion (NO3–) contained wastewater one potential nitrogen source. Selective NO3–-to-NH3 transformation eight-electron reduction, if promoted at atmospheric room temperature, may become a powerful recycling for NH3 production. Several photocatalytic systems have been proposed, but...

Ammonia is an indispensable chemical. Photocatalytic NH3 production via dinitrogen fixation using water by sunlight illumination under ambient conditions a promising strategy, although previously reported catalysts show insufficient activity. Herein, we showed that ultraviolet light irradiation of semiconductor, bismuth oxychloride with surface oxygen vacancies (BiOCl-OVs), in containing chloride anions (Cl–) N2 flow efficiently produces NH3. The OVs behave as the reduction sites photoformed...

The generation of hydrogen peroxide (H2O2) from water and dioxygen by sunlight-driven heterogeneous photocatalysis is a promising method for the artificial photosynthesis liquid solar fuel. We previously found that resorcinol–formaldehyde (RF) resin powders prepared high-temperature hydrothermal synthesis act as highly active semiconductor photocatalysts H2O2 generation. Herein, we report RF doped with poly(3-hexylthiophene-2,5-diyl) (RF/P3HT) exhibit enhanced photocatalytic activities....

Titanium dioxide with a mesoporous structure, when photoactivated in water, demonstrates an unprecedented photocatalytic activity, driven strongly by adsorption degree of molecules onto the catalyst surface, which promotes preferential conversion well-adsorbed molecule. This catalyzes selective transformation molecule into less-adsorbed molecule, so-labeled "stick-and-leave" transformation, direct hydroxylation benzene to phenol, one most difficult synthetic reactions, very high selectivity...

A rhodamine−cyclen conjugate (1) behaves as a highly sensitive and selective fluorescent chemosensor for Hg2+. The high emission selectivity is due to the formation of 1−Hg2+ 1:2 complex leading spirocycle opening 1.

A desulfurization and denitrogenation process for light oils has been investigated based on the chemical oxidation of sulfur- nitrogen-containing compounds using hydrogen peroxide acetic acid as oxidizing agent. Sulfur nitrogen compounds, when dissolved in n-tetradecane xylene, were oxidized under moderate conditions removed successfully. By use this basic process, although content actual was reduced to <22% corresponding feed values, sulfur failed be required deep level (0.05 wt %). This is...

Dual platinum action: A one-pot catalytic synthesis of benzimidazoles from the photoirradiation an alcohol solution containing ortho-arylenediamine and [email protected]2 nanoparticles is described. This reaction proceeded by platinum-assisted photocatalytic oxidation a dehydrogenation intermediates on surface nanoparticles. Detailed facts importance to specialist readers are published as "Supporting Information". Such documents peer-reviewed, but not copy-edited or typeset. They made...

Visible light irradiation (λ > 450 nm) of Pt-Cu bimetallic alloy nanoparticles (~3-5 supported on anatase TiO2 efficiently promotes aerobic oxidation. This is facilicated via the interband excitation Pt atoms by visible followed transfer activated electrons to conduction band. The positive charges formed oxidize substrates, and band reduce molecular oxygen, promoting photocatalytic cycles. apparent quantum yield for reaction catalyst ~17% under 550 nm monochromatic light, which much higher...

Photocatalytic production of hydrogen peroxide (H2O2) on semiconductor catalysts with alcohol as a source and molecular oxygen (O2) an has attracted much attention potential method for safe H2O2 synthesis, because the reaction can be carried out without use explosive H2/O2 mixed gases. Early reported photocatalytic systems aliphatic source, however, produce only few millimolar levels H2O2. We found that benzylic alcohols, when used photoreaction in water titanium dioxide (TiO2)...

A coumarin-spiropyran conjugate (2) shows a CN(-)-selective fluorescence enhancement under UV irradiation. This enables accurate determination of very low levels CN(-) (>0.5 μM).

Rejuvenating sunlight: Supported Au–Cu bimetallic alloy nanoparticles promote aerobic oxidation at room temperature under visible light (λ>450 nm) irradiation with little deactivation by the of surface Cu atoms oxygen. This is achieved through reduction oxidized Au atoms, a process which activated visible-light irradiation, even sunlight. As service to our authors and readers, this journal provides supporting information supplied authors. Such materials are peer reviewed may be re-organized...

Platinum (Pt) nanoparticles with <4 nm diameter loaded on graphitic carbon nitride (g-C3N4) by reduction at 673 K behave as efficient co-catalysts for photocatalytic hydrogen evolution under visible light (λ >420 nm). This is achieved strong Pt-support interaction due to the high temperature treatment, which facilitates transfer of photoformed conduction band electrons g-C3N4 Pt particles.

Thermally-induced isomerization of spiropyran derivatives in aqueous media has been studied. The colorless spirocyclic (SP) forms are isomerized to colored merocyanine (MC) even dark conditions at elevated temperature. Equilibrium, kinetic, and deuterium experiments reveal that the thermal SP → MC is due stabilization form by a hydrogen bonding interaction with water molecules. This leads ground state energy decreasing lower than form, resulting isomerization. property applicable rough...