Adsorption properties of manganese oxides prepared in aqueous-ethanol medium toward Sr(II) ions

2019 ◽  
Vol 321 (1) ◽  
pp. 243-253 ◽  
Author(s):  
A. I. Ivanets ◽  
V. V. Milutin ◽  
V. G. Prozorovich ◽  
T. F. Kouznetsova ◽  
N. A. Nekrasova
Keyword(s):  
Manganese Oxides ◽  
Aqueous Ethanol ◽  
Adsorption Properties ◽  
Ethanol Medium

Study on the Synthesis of Carboxymethylpachyman in the Aqueous-Ethanol Medium with the Assistance of Ultrasonics

2011 ◽  
Vol 236-238 ◽  
pp. 2810-2814
Author(s):  
Yong Jiang Wang ◽  
Xue Qian Wu ◽  
Shi Wang Liu ◽  
Yuan Feng Wu ◽  
Yan Ping Zhang
Keyword(s):  
Biological Activity ◽  
Aqueous Ethanol ◽  
Reaction Medium ◽  
Volume Ratio ◽  
Value Added ◽  
Poria Cocos ◽  
A Value ◽  
Ethanol Medium ◽  
Favorable Conditions ◽  
Carboxymethyl Pachyman

Water-insoluble β - ( 1 - 3 ) – D - glucan isolated from the sclerotium of Poria cocos hardly exhibits biological activity. Therefore, it is advantageous to produce a value-added product from Poria cocos. We extracted the β - ( 1 - 3 ) – D - glucan from the sclerotium of Poria cocos and synthesized a carboxymethylated derivative, carboxymethyl-pachyman (CMP). The influences on the degrees of substitution ( DS ) of CMP, for example, volume ratio of ethanol to water, [NaOH]/[MCA] ratio, reaction temperature and reaction time have been examined, respectively. The most favorable conditions for pachyman carboxymethylation are obtained with a [NaOH]/[MCA] ratio of 1.5, at 45°C for 60 minutes with a reaction medium consisting of a ethanol/water 80:20 (v/v) mixture.

Conductance Study of Benzyl Bromide Reaction with Cyclicamines in Aqueous-Ethanol Medium

2018 ◽  
Vol 7 (3.3) ◽  
pp. 143
Author(s):  
Veerati Radhika ◽  
. .
Keyword(s):  
Electrostatic Interactions ◽  
Mixed Solvent ◽  
Aqueous Ethanol ◽  
Benzyl Bromide ◽  
Frontier Molecular Orbital ◽  
Orbital Interactions ◽  
R Factor ◽  
Ethanol Medium ◽  
Solvation Of Ions ◽  
Homo Lumo

Nucleophilic substitution reaction of benzyl bromide and cyclicamines in ethanol aqueous intermediate reactivity can suggest that the nucleophile increases through their pKa values. A linear correlation exists between computed values of the dipole moment, rate and electronegativity of the nucelophiles. The two reactants suggest that frontier molecular orbital interactions ion-solvation and correlation of time with the HOMO-LUMO breach of that the reaction.  But it is not orbital controlled as well as forbidden by the electrostatic interactions along with mixed solvent composition between the reactants. The influence on the solvation of ions before reaction has been discuss with facilitate by R-factor. Thermodynamic properties are evaluate and report. The consequences of the learning to be interpreted in terms of ion-solvent exchanges and solvent properties comparing with electrostatic interaction between the reactants.   

Proline-Catalyzed Simple and Efficient Synthesis of 1,8-Dioxo-decahydroacridines in Aqueous Ethanol Medium

2008 ◽  
Vol 39 (2) ◽  
pp. 228-241 ◽  
Author(s):  
K. Venkatesan ◽  
Suresh S. Pujari ◽  
Kumar V. Srinivasan
Keyword(s):  
Aqueous Ethanol ◽  
Efficient Synthesis ◽  
Ethanol Medium

Highly selective arylhydrazone based “ON–OFF” fluorescent chemosensors for Zn2+ion, inhibitors for KB cell, 4LRH cancer protein and DFT studies

RSC Advances ◽  
2015 ◽  
Vol 5 (4) ◽  
pp. 2576-2585 ◽  
Author(s):  
Annamalai Subhasri ◽  
Chinnadurai Anbuselvan
Keyword(s):  
Molecular Docking ◽  
Cytotoxic Activity ◽  
Aqueous Ethanol ◽  
Dft Studies ◽  
Fluorescent Chemosensors ◽  
Simple Method ◽  
Ethanol Medium

Arylhydrazone based new Zn2+“ON–OFF” chemosensors in neutral aqueous ethanol medium have been designed by simple method. Additionally their cytotoxic activity towards KB cell and molecular docking with 4LRH cancer proteins also investigated.

scholarly journals Investigation into the adsorption of methylene blue on the surface of a "core–shell" type catalyst for the Fenton system

2020 ◽  
pp. 91-98
Keyword(s):  
Methylene Blue ◽  
Manganese Oxides ◽  
Equilibrium Constants ◽  
Protective Layer ◽  
Spectrophotometric Analysis ◽  
Adsorption Properties ◽  
Blue Dye ◽  
Core Shell ◽  
Fenton Process ◽  
Ferrite Core

The catalytic oxidation of organic substances, in particular by the Fenton method, is one of the effective methods of wastewater treatment. The oxidation efficiency is affected by the adsorption properties of the catalyst when using heterogeneous catalysts in the Fenton process. In this work, the adsorption kinetics of methylene blue dye from aqueous solutions of different concentrations on the surface of the synthesized nanostructured magnetosensitive catalyst CoFe2O4/SiO2/CoMnO2 was studied by spectrophotometric analysis and the kinetic parameters of the process were determined. The CoMnO2-based "core–shell" catalyst has a magnetically sensitive cobalt ferrite core coated with a protective layer of porous SiO2, on the surface of which clusters of cobalt and manganese oxides are placed as catalytic centers. The process of adsorption of methylene blue from an aqueous solution can be considered as a quasi-chemical reaction of displacement of solvent molecules from the adsorption layer by dye molecules. The equilibrium state is described by the Langmuir equation, in which the effective adsorption constant is the ratio of the equilibrium constants of the Langmuir interactions of the dye and the solvent, respectively, with the active center of the adsorbent. The limiting adsorption of methylene blue and the adsorption constant characterizing the affinity of the dye to the catalyst surface were determined. The specific area of the catalyst was calculated under the condition of a known landing plane of the dye molecule. The influence of the adsorption properties of the catalyst on the efficiency of the Fenton process was established.

Acidic Pyridinium Inner Salt as a New, Effective and Reusable Catalyst for the One-Pot Three-Component Synthesis of N-substituted 5-aryl-4-benzoyl-3-hydroxy-3-pyrrolin-2-ones in Aqueous Media

2021 ◽  
Vol 08 ◽  
Author(s):  
Roya Shahnaei ◽  
Hassan Kabirifard
Keyword(s):  
Aqueous Ethanol ◽  
Cold Water ◽  
Aromatic Aldehydes ◽  
Primary Amines ◽  
Elemental Analysis Data ◽  
Homogeneous Catalyst ◽  
Reusable Catalyst ◽  
Water Mixture ◽  
One Pot ◽  
Ethanol Medium

Background: The present method is facile and effective for the synthesis of N-substituted 5-aryl-4-benzoyl-3-hydroxy-3-pyrrolin-2-one derivatives which are obtained by one-pot three-component condensation reactions of aromatic aldehydes, primary amines and ethyl benzoylpyruvate in the presence of a novel homogeneous catalyst including acidic pyridinium inner salt (PIS) at 50°C in ethanol and water mixture as solvent. Methods: 5-Aryl-4-benzoyl-3-hydroxy-3-pyrrolin-2-ones were synthesized through a one-pot three-component tandem formation of Schiff base cyclocondensation reaction of aromatic aldehydes, primary amines and ethyl benzoylpyruvate in the presence of 10 mol% of acidic pyridinium inner salt as a catalyst under aqueous ethanol medium at 50°C. All obtained structures were confirmed by their elemental analysis data and IR, 1H NMR and 13C NMR spectroscopy. Results: Three-component synthesis of 5-aryl-4-benzoyl-3-hydroxy-3-pyrrolin-2-ones catalyzed by acidic pyridinium inner salt with aromatic aldehydes, primary amines and ethyl benzoylpyruvate in aqueous ethanol medium at 50°C was prepared. The achieved derivatives (eight entries) were well synthesized in excellent yields. Conclusion: We found acidic pyridinium inner salt as a proper catalyst for this method. Catalyst Novelty is excellent catalytic activity, easy separation of the reaction mixture by washing with cold water and reusability of the catalyst for six consecutive periods without disrupting the activity of this catalyst system.

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