scholarly journals Plasmonic Switching of the Reaction Pathway: Visible‐Light Irradiation Varies the Reactant Concentration at the Solid–Solution Interface of a Gold–Cobalt Catalyst

2019 ◽  
Vol 131 (35) ◽  
pp. 12160-12164 ◽  
Author(s):  
Erandi Peiris ◽  
Sarina Sarina ◽  
Eric R. Waclawik ◽  
Godwin A. Ayoko ◽  
Pengfei Han ◽  
...  
Keyword(s):  
Solid Solution ◽  
Visible Light ◽  
Visible Light Irradiation ◽  
Cobalt Catalyst ◽  
Reaction Pathway ◽  
Light Irradiation ◽  
Reactant Concentration ◽  
Solution Interface

scholarly journals Photocatalytic oxidation of benzene to phenol using dioxygen as an oxygen source and water as an electron source in the presence of a cobalt catalyst

2017 ◽  
Vol 8 (10) ◽  
pp. 7119-7125 ◽  
Author(s):  
Ji Won Han ◽  
Jieun Jung ◽  
Yong-Min Lee ◽  
Wonwoo Nam ◽  
Shunichi Fukuzumi
Keyword(s):  
Visible Light ◽  
Visible Light Irradiation ◽  
Photocatalytic Oxidation ◽  
Cobalt Catalyst ◽  
Electron Source ◽  
Light Irradiation ◽  
Turnover Number ◽  
High Turnover ◽  
Hydroxylation Of Benzene ◽  
Oxidation Of Benzene

The present study reports the first example of photocatalytic hydroxylation of benzene with O2 and H2O, both of which are the most green reagents, under visible light irradiation to afford a high turnover number.

scholarly journals Visible Light Responsive Strontium Carbonate Catalyst Derived from Solvothermal Synthesis

Catalysts ◽  
2020 ◽  
Vol 10 (9) ◽  
pp. 1069
Author(s):  
Pornnaphat Wichannananon ◽  
Thawanrat Kobkeatthawin ◽  
Siwaporn Meejoo Smith
Keyword(s):  
Visible Light ◽  
Visible Light Irradiation ◽  
Degradation Products ◽  
Reaction Pathway ◽  
Direct Injection ◽  
Radical Scavenging ◽  
Strontium Carbonate ◽  
Light Irradiation ◽  
Light Illumination ◽  
Strontium Hydroxide

A single crystalline phase of strontium carbonate (SrCO3) was successfully obtained from solvothermal treatments of hydrated strontium hydroxide in ethanol (EtOH) at 100 °C for 2 h, using specific Sr:EtOH mole ratios of 1:18 or 1:23. Other solvothermal treatment times (0.5, 1.0 and 3 h), temperatures (80 and 150 °C) and different Sr:EtOH mole ratios (1:13 and 1:27) led to formation of mixed phases of Sr-containing products, SrCO3 and Sr(OH)2 xH2O. The obtained products (denoted as 1:18 SrCO3 and 1:23 SrCO3), containing a single phase of SrCO3, were further characterized in comparison with commercial SrCO3, and each SrCO3 material was employed as a photocatalyst for the degradation of methylene blue (MB) in water under visible light irradiation. Only the 1:23 SrCO3 sample is visible light responsive (Eg = 2.62 eV), possibly due to the presence of ethanol in the structure, as detected by thermogravimetric analysis. On the other hand, the band gap of 1:18 SrCO3 and commercial SrCO3 are 4.63 and 3.25 eV, respectively, and both samples are UV responsive. The highest decolourisation efficiency of MB solutions was achieved using the 1:23 SrCO3 catalyst, likely due to its narrow bandgap. The variation in colour removal results in the dark and under visible light irradiation, with radical scavenging tests, suggests that the high decolourisation efficiency was mainly due to a generated hydroxyl-radical-related reaction pathway. Possible degradation products from MB oxidation under visible light illumination in the presence of SrCO3 are aromatic sulfonic acids, dimethylamine and phenol, as implied by MS direct injection measurements. Key findings from this work could give more insight into alternative synthesis routes to tailor the bandgap of SrCO3 materials and possible further development of cocatalysts and composites for environmental applications.

scholarly journals Cobalt-catalyzed aminocarbonylation of (hetero)aryl halides promoted by visible light

2020 ◽  
Vol 11 (27) ◽  
pp. 7210-7213 ◽  
Author(s):  
Alexander M. Veatch ◽  
Erik J. Alexanian
Keyword(s):  
Visible Light ◽  
Visible Light Irradiation ◽  
Cobalt Catalyst ◽  
Aryl Halides ◽  
Light Irradiation

An aminocarbonylation of (hetero)aryl halides using a simple cobalt catalyst under visible light irradiation is presented.

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