3-D hierarchical Ag/ZnO@CF for synergistically removing phenol and Cr(VI): Heterogeneous vs. homogeneous photocatalysis

2020 ◽  
Vol 558 ◽  
pp. 85-94 ◽  
Author(s):  
He Liang ◽  
Tianren Li ◽  
Jun Zhang ◽  
Dandan Zhou ◽  
Chengzhi Hu ◽  
...  
Keyword(s):  
Homogeneous Photocatalysis

Dissolution and Performing Homogeneous Photocatalysis of Polymeric Carbon Nitride

2018 ◽  
Author(s):  
Chaofeng Huang ◽  
Jing Wen ◽  
Yanfei Shen ◽  
Fei He ◽  
Li Mi ◽  
...  
Keyword(s):  
Conjugated Polymer ◽  
Carbon Nitride ◽  
Heterogeneous Catalysts ◽  
Methane Sulfonic Acid ◽  
Environment Friendly ◽  
The Poor ◽  
Catalytic Sites ◽  
Homogeneous Photocatalysis ◽  
Polymeric Carbon ◽  
First Time

<a></a><a>As a metal-free conjugated polymer, carbon nitride (CN) has attracted tremendous attention as heterogeneous (photo)catalysts. </a><a></a><a>By following prototype of enzymes, making all catalytic sites of accessible via homogeneous reactions is a promising approach toward maximizing CN activity, but hindered due to </a><a></a><a>the poor insolubility of CN</a>. Herein, we report the dissolution of CN in environment-friendly methane sulfonic acid and the homogeneous photocatalysis driven by CN for the first time with the activity boosted up to 10-times, comparing to the heterogeneous counterparts. Moreover, facile recycling and reusability, the <a>hallmark</a> of heterogeneous catalysts, were kept for the homogeneous CN photocatalyst via reversible precipitation using poor solvents. It opens new vista of CN in homogeneous catalysis and offers a successful example of polymeric catalysts in bridging gaps of homo/heterogeneous catalysis.

scholarly journals Water‐Soluble Polymeric Carbon Nitride Colloidal Nanoparticles for Highly Selective Quasi‐Homogeneous Photocatalysis

2019 ◽  
Vol 132 (1) ◽  
pp. 495-503 ◽  
Author(s):  
Igor Krivtsov ◽  
Dariusz Mitoraj ◽  
Christiane Adler ◽  
Marina Ilkaeva ◽  
Mariana Sardo ◽  
...  
Keyword(s):  
Carbon Nitride ◽  
Water Soluble ◽  
Colloidal Nanoparticles ◽  
Homogeneous Photocatalysis ◽  
Polymeric Carbon

scholarly journals Photocatalytic (Hetero)Arylation of C(sp3)–H Bonds with Carbon Nitride

2020 ◽  
Author(s):  
Saikat Das ◽  
Kathiravan Murugesan ◽  
GONZALO JAVIER VILLEGAS RODRIGUEZ ◽  
Jaspreet Kaur ◽  
Joshua Barham ◽  
...  
Keyword(s):  
Organic Semiconductor ◽  
Carbon Nitride ◽  
Hydrogen Atom Transfer ◽  
Graphitic Carbon ◽  
Graphitic Carbon Nitride ◽  
Nickel Catalysis ◽  
Direct Functionalization ◽  
Low Toxicity ◽  
Homogeneous Photocatalysis ◽  
Carbon Nitride Materials

Polymeric graphitic carbon nitride materials have attracted significant interest in recent years and found applications in diverse light-to-energy conversions such as artificial photosynthesis, CO<sub>2 </sub>reduction or degradation of organic pollutants. However, their utilization in synthetic photocatalysis especially in the direct functionalization of C(sp<sup>3</sup>)−H bonds remains underexplored. Herein, we report mesoporous graphitic carbon nitride (mpg-CN) as a heterogeneous organic semiconductor photocatalyst for direct arylation of sp<sup>3</sup> C−H bonds <i>via </i>a combination of<i> </i>hydrogen atom transfer and nickel catalysis. Our protocol has a broad synthetic scope (>70 examples including late-stage modification of densely functionalized bio-active molecules), is operationally simple, and shows high chemo- and regioselectivity. Facile separation and recycling of the mpg-CN catalyst in combination with its low preparation cost, innate photochemical stability and low toxicity are beneficial features overcoming typical shortcomings of homogeneous photocatalysis. Additionally, mechanistic investigations indicate that an unprecedented energy transfer process (EnT) from the organic semiconductor to the nickel complex is operating.

Homogeneous Photocatalysis

2016 ◽  
Author(s):  
Silvia E. Braslavsky ◽  
André M. Braun ◽  
Alberto E. Cassano ◽  
Alexei V. Emeline ◽  
Marta I. Litter ◽  
...  
Keyword(s):  
Homogeneous Photocatalysis

scholarly journals Treatment of Pesticides in Wastewater by Heterogeneous and Homogeneous Photocatalysis

2012 ◽  
Vol 2012 ◽  
pp. 1-6 ◽  
Author(s):  
Catalina Daniela Stan ◽  
Igor Cretescu ◽  
Cristina Pastravanu ◽  
Ioannis Poulios ◽  
Maria Drăgan
Keyword(s):  
Aqueous Solutions ◽  
Acid Medium ◽  
Homogeneous Catalysis ◽  
Oxidative Degradation ◽  
Heterogeneous Reactions ◽  
Mepiquat Chloride ◽  
Pesticide Concentration ◽  
Five Factors ◽  
Degradation Rates ◽  
Homogeneous Photocatalysis

The effect of different heterogeneous and homogeneous photocatalytic systems on the oxidative degradation of mepiquat chloride in aqueous solutions was investigated. In the case of heterogeneous reactions, the influence of five factors was studied: the type of catalyst, photocatalyst concentration, pH, pesticide concentration, and the presence of H2O2and/or Fe3+. For homogeneous catalysis, other factors were studied: the oxidising agent and the light source. Nearly complete degradation of mepiquat chloride was obtained after about 180 minutes in the presence of an acid medium (pH3) using a UV-A lamp and TiO2P-25 catalyst (0.5 g/L), for an initial pesticide concentration of 10 ppm. Degradation rates corresponding to homogeneous photocatalysis were lower compared to those corresponding to the use of TiO2as the photocatalyst.

Homogeneous photocatalysis of ethanol reduction of nitrobenzene by titanium complexes

1993 ◽  
Vol 28 (5-6) ◽  
pp. 319-321 ◽  
Author(s):  
A. I. Kryukov ◽  
S. Ya. Kuchmii ◽  
S. I. Kulik ◽  
A. V. Korzhak
Keyword(s):  
Titanium Complexes ◽  
Homogeneous Photocatalysis

Unraveling Side Reactions in the Photocatalytic Reduction of CO2: Evidence for Light-Induced Deactivation Processes in Homogeneous Photocatalysis

ChemCatChem ◽  
2015 ◽  
Vol 7 (4) ◽  
pp. 690-697 ◽  
Author(s):  
Simon Meister ◽  
Richard O. Reithmeier ◽  
Martin Tschurl ◽  
Ueli Heiz ◽  
Bernhard Rieger
Keyword(s):  
Photocatalytic Reduction ◽  
Side Reactions ◽  
Homogeneous Photocatalysis ◽  
Reduction Of Co2

Removal of benzoic acid in aqueous solution by Fe(III) homogeneous photocatalysis

2004 ◽  
Vol 38 (5) ◽  
pp. 1225-1236 ◽  
Author(s):  
Roberto Andreozzi ◽  
Raffaele Marotta
Keyword(s):  
Aqueous Solution ◽  
Benzoic Acid ◽  
Homogeneous Photocatalysis

scholarly journals Dissolution and homogeneous photocatalysis of polymeric carbon nitride

2018 ◽  
Vol 9 (41) ◽  
pp. 7912-7915 ◽  
Author(s):  
Chaofeng Huang ◽  
Jing Wen ◽  
Yanfei Shen ◽  
Fei He ◽  
Li Mi ◽  
...  
Keyword(s):  
Carbon Nitride ◽  
Heterogeneous Catalysts ◽  
Homogeneous Photocatalysis ◽  
Polymeric Carbon

After dissolution, a homogeneous carbon nitride photocatalyst showed boosted activity; meanwhile, the hallmarks of heterogeneous catalysts (facile separation and recycling) were retained.

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