The iron catalyzed oxidation of sulfur(IV) in aqueous solution: Differing effects of organics at high and low pH

1991 ◽  
Vol 96 (D2) ◽  
pp. 3085 ◽  
Author(s):  
L. R. Martin ◽  
M. W. Hill ◽  
A. F. Tai ◽  
T. W. Good
Keyword(s):  
Aqueous Solution ◽  
Low Ph ◽  
Catalyzed Oxidation

Ag (I) Catalyzed Oxidation of SO2 in Aqueous Solution Differing Effect of Benzoate Ions in Acidic Medium

2017 ◽  
Vol 7 (4) ◽  
Author(s):  
Arun Kumar Sharma ◽  
Pradeep Parasher ◽  
Rashmi Sharma ◽  
Davarakonda S.N. Prasad
Keyword(s):  
Aqueous Solution ◽  
Acidic Medium ◽  
Differing Effect ◽  
Catalyzed Oxidation

Pattern Formation in the Methylene Blue-Fructose-Oxygen System in Aqueous Solution and in Gel Systems

2000 ◽  
Vol 65 (9) ◽  
pp. 1394-1402 ◽  
Author(s):  
Ľubica Adamčíková ◽  
Mária Hupková ◽  
Peter Ševčík
Keyword(s):  
Aqueous Solution ◽  
Methylene Blue ◽  
Pattern Formation ◽  
Alkaline Ph ◽  
Initial Reactant ◽  
Nonlinear Reaction ◽  
Oxygen System ◽  
Hydrodynamic Processes ◽  
Liquid Layer Thickness ◽  
Catalyzed Oxidation

Spatial patterns in methylene blue-catalyzed oxidation of fructose at alkaline pH were found in aqueous solution and in gel systems. In a thin liquid layer (thickness >2.4 mm) a mixture of spots and stripes was formed by interaction of a nonlinear reaction and the Rayleigh or Maragoni instabilities. The pattern formation was affected by initial reactant concentrations and by the thickness of the reaction mixture layer. Long-lasting structures were formed in gel systems (polyacrylamide, agar, gelatin). These patterns also arise primarily from hydrodynamic processes.

scholarly journals Adsorption of Cr6+ Onto Unmodified and Hydrochloric Acid Modified African Nutmeg Pod (Monodora myristica) from Aqueous Solution

2019 ◽  
pp. 1-8
Author(s):  
F. U. Okwunodulu ◽  
H. O. Chukwuemeka-Okorie ◽  
N. M. Mgbemena ◽  
J. B. I. Kalu
Keyword(s):  
Aqueous Solution ◽  
Metal Ion ◽  
Correlation Coefficients ◽  
Freundlich Isotherm ◽  
Low Ph ◽  
Ion Concentration ◽  
Isotherm Models ◽  
Particle Sizes ◽  
Monodora Myristica ◽  
Best Fit

The removal of Cr6+ from aqueous solution using unmodified and hydrochloric modified African nutmeg pod was studied. The effects of particle size, pH and initial metal ions concentration adsorbed were investigated. The amount of metal ion adsorbed increased as the initial metal ion concentration increased and also decreased at low pH of 2 for both modified and unmodified African nutmeg pod.  400 µm and 250 µm were the optimum particle sizes for both modified and unmodified African nutmeg pod respectively, values given as 75.8 mg/g for the modified and 93.39 mg/g for the unmodified. Generally, it was observed that the unmodified African nutmeg pod showed greater adsorption capacity than the modified African nutmeg pod. The equilibrium experimental data were examined via Langmuir and Freundlich isotherm models.  Freundlich isotherm model gave the best fit for the data in both unmodified and modified African nutmeg pod based on the correlation coefficients (R2 values) gotten. The results of the study showed that the African nutmeg pod is efficient for the removal of Cr6+ from aqueous solutions especially when unmodified.

scholarly journals Vanadate ion-catalyzed oxidation of methane with hydrogen peroxide in an aqueous solution

2008 ◽  
Vol 48 (6) ◽  
pp. 440-443 ◽  
Author(s):  
V. B. Romakh ◽  
G. Süss-Fink ◽  
G. B. Shul’pin
Keyword(s):  
Aqueous Solution ◽  
Hydrogen Peroxide ◽  
Oxidation Of Methane ◽  
Catalyzed Oxidation

Rare Earth Ion from Aqueous Solution Removed by Polymer Enhanced Ultrafiltration Process

2011 ◽  
Vol 233-235 ◽  
pp. 959-964 ◽  
Author(s):  
Gui E Chen ◽  
De Sun ◽  
Zhen Liang Xu
Keyword(s):  
Aqueous Solution ◽  
Rare Earth ◽  
Low Ph ◽  
Water Soluble ◽  
Rare Earth Ion ◽  
Water Soluble Polymers ◽  
Soluble Polymers ◽  
Ion Rejection ◽  
Ultrafiltration Process ◽  
Added Salt

An efficiency of rare earth (europium, Eu) removal from aqueous solutions by polymer enhanced ultrafiltration (PEUF) process was investigated using two water-soluble polymers polyacrylic acid (PAA) and polyethylenimine (PEI). The effects of loading ratios of Eu to PAA or PEI, pH of solution and the added salt on Eu removal were evaluated. It was shown that the binding capacities for PAA and PEI to Eu ions were 0.8g Eu/g PAA and 0.5g Eu/g PEI, respectively. Eu ion rejection R decreased significantly at a low pH compared to the results at high pH, regardless of using PAA or PEI. Compared to the PAA case, PEI enhanced UF was more sensitive with changing pH. The effect of the added salt was slightly weak at pH 4-5.At the decomplexation stage, when permeate volume was equal to three times than that of the retentate, Eu removal efficiency (X) of Eu-PAA enhanced UF was 79.5% while that of Eu-PEI enhanced UF was 76.1%, and the polymer PAA and PEI could be recovered more than 97% and 93%, respectively. Eu in the retentate could be extracted effectively and the purified PAA and PEI solution were obtained. The recovered PAA and PEI solution was same as the fresh PAA and PEI solution in PEUF processes carried out by using the recovery recovered PAA and PEI as complex agents.

Removal of fluoride ions from aqueous solution at low pH using schwertmannite

2008 ◽  
Vol 152 (2) ◽  
pp. 571-579 ◽  
Author(s):  
Akbar Eskandarpour ◽  
Maurice S. Onyango ◽  
Aoyi Ochieng ◽  
Shigeo Asai
Keyword(s):  
Aqueous Solution ◽  
Low Ph ◽  
Fluoride Ions
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