The photocatalytic mechanism of organic dithienophosphole derivatives as highly efficient photo-redox catalysts

2020 ◽  
Vol 22 (36) ◽  
pp. 20721-20731
Author(s):  
Ping-Ping Sun ◽  
Weijie Chi ◽  
Devesh R. Kripalani ◽  
Kun Zhou
Keyword(s):  
Rate Constants ◽  
High Rate ◽  
Activation Barriers ◽  
Photocatalytic Mechanism ◽  
Highly Efficient ◽  
Redox Catalysts

Low activation barriers and high rate constants are obtained in both activation and deactivation processes featuring DTP derivatives as highly efficient photo-redox catalysts.

3D self-assembled VS4 microspheres with high pseudocapacitance as highly efficient anodes for Na-ion batteries

Nanoscale ◽  
2018 ◽  
Vol 10 (46) ◽  
pp. 21671-21680 ◽  
Author(s):  
Wenbin Li ◽  
Jianfeng Huang ◽  
Liangliang Feng ◽  
Liyun Cao ◽  
Shuwei He
Keyword(s):  
Active Sites ◽  
High Capacity ◽  
Rate Capability ◽  
High Rate ◽  
High Rate Capability ◽  
Highly Efficient ◽  
Pseudocapacitive Behavior ◽  
Surface Active ◽  
Self Assembled ◽  
Cycling Life

The decreasing crystallinity of VS4 microspheres greatly increases the surface active sites, and then promotes the pseudocapacitive behavior, and finally leads to the high capacity, long cycling life and high rate capability.

An efficient and eco-friendly method for the thiol-Michael addition in aqueous solutions using amino acid ionic liquids (AAILs) as organocatalysts

2020 ◽  
Vol 92 (1) ◽  
pp. 97-106
Author(s):  
Roberto Figueroa Guíñez ◽  
José G. Santos ◽  
Ricardo A. Tapia ◽  
Jackson J. Alcazar ◽  
Margarita E. Aliaga ◽  
...  
Keyword(s):  
Aqueous Solution ◽  
Ionic Liquids ◽  
Amino Acid ◽  
Efficient Method ◽  
Michael Addition ◽  
Rate Constants ◽  
Michael Reaction ◽  
High Rate ◽  
Reusable Catalyst ◽  
Reaction Conditions

AbstractA series of amino-acid based ionic liquids (Bmim[AA]s) have been synthesized and evaluated as catalysts, in aqueous solution. The results of a kinetic study of the thiol-Michael reaction of L-Cysteine with trans-β-nitrostyrene demonstrated the advantages of using (Bmim[AA]s) as organocatalysts. The benefits include high rate constants; mild reaction conditions; and, a reusable catalyst, which leads to a simple and efficient method for these important kinds of reactions.

Sol–Gel Assisted Isotropic Morphological Progression in Nanostructured MoO3 and Allied Investigations on Photocatalytic Dye-Degradation

2019 ◽  
Vol 19 (6) ◽  
pp. 3479-3486 ◽  
Author(s):  
Nilam Qureshi ◽  
Manish Shinde ◽  
Sudhir Arbuj ◽  
Sunit Rane ◽  
Anand Bhalerao ◽  
...  
Keyword(s):  
Methylene Blue ◽  
Optical Properties ◽  
Photocatalytic Degradation ◽  
Rate Constants ◽  
Dye Degradation ◽  
Sol Gel ◽  
High Rate ◽  
Photocatalytic Dye Degradation ◽  
Gel Technique ◽  
Synthesis Protocol

We report tunable-morphology oriented facile yet scalable route to synthesize 1D (nanorod) and 2D (nanobelt) MoO3 nanostructures at gram scale using conventional as well as sonochemistry assisted sol–gel technique. The structural, morphological and optical properties of the samples can be befittingly altered by varying the synthesis protocol. The resultant orthorhombic MoO3 nanomorphs demonstrated efficient and expeditious photocatalytic degradation of the pollutant dye, Methylene Blue (MB). We have observed that appreciable photocatalytic MB dye-degradation can be accomplished within 30 minutes with high rate constants of 0.0786 min−1 and 0.233 min−1 for rod and belt-like MoO3-nanostructures, respectively. The pilot results indicate that the resultant MoO3 nanomorphs can be potentially used as solar light driven industrial photocatalyst material with their intrinsic photostability.

Solvolyse und Phosphorylierungrseaktionen von Polyphosphorsäureestern / Solvolysis and Phosphorylating Activity of Polyphosphate Esters

1971 ◽  
Vol 26 (7) ◽  
pp. 694-700 ◽  
Author(s):  
Hans Berger
Keyword(s):  
Potentiometric Titration ◽  
Rate Constants ◽  
Reaction Rates ◽  
High Rate ◽  
Catalytic Effects ◽  
Hydrolysis Of

Reaction rates of the ethanolysis and hydrolysis of the phenyl- and methylpolyphosphate-esters and of tetraphenylpyrophosphate were measured by potentiometric titration methods. Exceptionally high rate constants were obtained for the solvolysis of these compounds, some reactions occurring with half-times of less than 10 seconds. The phosphorylating activity of the phenylpolyphosphateester on polyfunctional nucleophilic compounds (SN2P-reaction) was tested and shown to exceed the activity of the conventional agent diphenylphosphoro-chloridate considerably. The catalytic effects of dimethylformamide were measured under several conditions and were shown to be complex solvent phenomena rather than conventional catalysis. The reactivity of the polyphosphate-esters is discussed with respect to their structure as well as the reactivity of P -O -P-bonds as a function of their ligands.

scholarly journals Highly efficient photocatalytic activity of Ag3PO4/Ag/ZnS(en)0.5 photocatalysts through Z-scheme photocatalytic mechanism

RSC Advances ◽  
2017 ◽  
Vol 7 (30) ◽  
pp. 18392-18399 ◽  
Author(s):  
Na Wei ◽  
Hongzhi Cui ◽  
Mingliang Wang ◽  
Xinzhen Wang ◽  
Xiaojie Song ◽  
...  
Keyword(s):  
Composite Material ◽  
Photocatalytic Activity ◽  
Hydrothermal Method ◽  
Facile Hydrothermal Method ◽  
Photocatalytic Mechanism ◽  
Highly Efficient

A novel Z-scheme Ag3PO4/Ag/ZnS(en)0.5 composite material was successfully prepared via a facile hydrothermal method and in situ precipitation.

Étude théorique des réactions d'abstraction d'hydrogène , avec R, X≡H, CH3, NH2,OH et F

1985 ◽  
Vol 63 (7) ◽  
pp. 1447-1456 ◽  
Author(s):  
Georges Leroy ◽  
Michel Sana ◽  
Anne Tinant
Keyword(s):  
Transition State ◽  
Rate Constants ◽  
Transition State Theory ◽  
Hydrogen Abstraction ◽  
State Theory ◽  
Arrhenius Behavior ◽  
Activation Barriers ◽  
Empirical Procedure ◽  
Semi Empirical ◽  
Theory And Experiment

Hydrogen abstraction reactions [Formula: see text] with R, X≡H, CH3, NH2,OH, and F have been studied at the abinitio 6-31G – UHF level. However, energetic properties were computed at the CI level. Rate constants and Arrhenius parameters have been obtained using the transition state theory formalism with Eckart's tunneling correction. The discrepancy between theoretical and experimental results led us to elaborate a semi-empirical procedure to calculate activation barriers, in which the bonds R—H and X—H are represented by Morse curves. Thus, the agreement between theory and experiment is much better. Moreover, the results obtained by this procedure demonstrate the non-Arrhenius behavior of all the reactions under consideration and allow us to rationalize a large number of experimental facts.

Highly Efficient Photocatalytic Activity of g-C3N4/Ag3PO4 Hybrid Photocatalysts through Z-Scheme Photocatalytic Mechanism under Visible Light

2014 ◽  
Vol 53 (19) ◽  
pp. 8018-8025 ◽  
Author(s):  
Hideyuki Katsumata ◽  
Tsubasa Sakai ◽  
Tohru Suzuki ◽  
Satoshi Kaneco
Keyword(s):  
Photocatalytic Activity ◽  
Visible Light ◽  
Photocatalytic Mechanism ◽  
Highly Efficient

Highly efficient (BiO)2CO3-BiO2-x-graphene photocatalysts: Z-Scheme photocatalytic mechanism for their enhanced photocatalytic removal of NO

2019 ◽  
Vol 240 ◽  
pp. 241-252 ◽  
Author(s):  
Yuefa Jia ◽  
Shiping Li ◽  
Jianzhi Gao ◽  
Gangqiang Zhu ◽  
Fuchun Zhang ◽  
...  
Keyword(s):  
Photocatalytic Mechanism ◽  
Highly Efficient ◽  
Photocatalytic Removal

Constructing highly-efficient electron transport channels in the 3D electrode materials for high-rate supercapacitors: The case of NiCo2O4@NiMoO4 hierarchical nanostructures

2017 ◽  
Vol 307 ◽  
pp. 687-695 ◽  
Author(s):  
Peng Zhang ◽  
Jinyuan Zhou ◽  
Wanjun Chen ◽  
Yuanyuan Zhao ◽  
Xuemei Mu ◽  
...  
Keyword(s):  
Electron Transport ◽  
Electrode Materials ◽  
High Rate ◽  
Hierarchical Nanostructures ◽  
Highly Efficient ◽  
Transport Channels ◽  
3D Electrode
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