Equilibrium, Kinetics and Thermodynamic Investigation of Oxalic Acid Adsorption from Aqueous Solutions on Bentonite and Carbon

2016 ◽  
Vol 5 (2) ◽  
pp. 134-144 ◽  
Author(s):  
F. Anouar ◽  
A. Mestari ◽  
A. Elmchaouri ◽  
N. Taoufik ◽  
A. Jada
Keyword(s):  
Oxalic Acid ◽  
Aqueous Solutions ◽  
Thermodynamic Investigation ◽  
Kinetics And Thermodynamic

Kinetics and Thermodynamic Investigation of Phosphate Adsorption on AlCl3 Modified Palygorskite

2013 ◽  
Vol 683 ◽  
pp. 530-533
Author(s):  
Yan Zhang ◽  
Xian Jun Lv ◽  
Xiao Yan Kou
Keyword(s):  
Aqueous Solutions ◽  
Langmuir Isotherm ◽  
Goodness Of Fit ◽  
Phosphate Adsorption ◽  
Order Model ◽  
Thermodynamic Investigation ◽  
Process Kinetics ◽  
Pseudo Second Order ◽  
Modified Palygorskite ◽  
Kinetics And Thermodynamic

The potential of AlCl3 modified palygorskite was assessed for adsorption of phosphate from aqueous solutions. The Langmuir isotherm adequately described adsorption with an R2 goodness of fit of 0.9683. The process kinetics was found to follow the pseudo-second-order model. Positive △H and △S values indicated that the adsorption of phosphate onto AlCl3 modified palygorskite was endothermic. Negative △G showed that the adsorption of phosphate onto this sorbent is feasible and spontaneous.

scholarly journals Selective removal of lead ions from aqueous solutions using SiO2–MoO3: Isotherm, kinetics and thermodynamic studies

2021 ◽  
Vol 3 ◽  
pp. 100083
Author(s):  
Jasmina Sulejmanović ◽  
Neira Kovač ◽  
Mustafa Memić ◽  
Elma Šabanović ◽  
Sabina Begić ◽  
...  
Keyword(s):  
Aqueous Solutions ◽  
Selective Removal ◽  
Lead Ions ◽  
Thermodynamic Studies ◽  
Kinetics And Thermodynamic

The metachors of polyvalent and associated electrolytes in aqueous solutions

1984 ◽  
Vol 49 (5) ◽  
pp. 1079-1089
Author(s):  
Jiří Čeleda ◽  
Stanislav Škramovský ◽  
Jana Žilková
Keyword(s):  
Experimental Data ◽  
Surface Tension ◽  
Oxalic Acid ◽  
Organic Acids ◽  
Aqueous Solutions ◽  
Preceding Paper ◽  
Weak Electrolytes ◽  
Direct Proportionality ◽  
Very High

The quantity metachor introduced in the preceding paper was evaluated from the experimental data on surface tension of the aqueous solutions for a set of polyvalent and weak electrolytes. The almost complete concentration independence of the metachor and its direct proportionality to the number of the free charges in a dissociated molecule (observed and theoretically substantiated in the above cited paper for strong 1,1-, 1,2- and 2,1-valent electrolytes) has been verified in the present paper also for electrolytes of the higher valency types. The metachor values of fully dissociated 1,1-, 1,2-, 1,3- and 1,4-valent electrolytes follow a ratio (5 ± 1) : (10 ± 1.5) : 15 : 22 cm3 mol-1. Association of the electrolytes decreases correspondingly the metachor value as one can see on the case of electrolytes with bulky ions (NH4SCN, KCH3COO, Na2S2O3, hexacyanoferrates(II) or with the free acids H2SO4, H2CrO4, H3PO4 etc. A weak, in the investigated concentration range neglibility dissociated oxalic acid, consisting of small hydrated hydrophilic molecules, exhibits metachor values close to zero. Dibasic organic acids with a larger number of hydrophobic CH2 groups reach very high negative metachor values, however, their salts again possess metachor values close to 10 cm3 mol-1 - in accordance with the values found for strong 1,2-valent electrolytes. The metachors of ZnCl2 and CdCl2 decrease sharply from the last mentioned value, with increasing concentration while the metachor value of zinc perchlorate remains unchanged at the level corresponding to the fully dissociated salt. This is in agreement with the well known sequence of tendency of the d10-cations to form complexes with the Cl- and ClO-4 anions. All these facts have verified that the metachor can be, in principle, applied for a diagnostic states of the electrolytes in aqueous solutions.

Removal of uranium(VI) from aqueous solutions by magnetic Schiff base: Kinetic and thermodynamic investigation

2012 ◽  
Vol 198-199 ◽  
pp. 412-419 ◽  
Author(s):  
Xiaofei Zhang ◽  
Caishan Jiao ◽  
Jun Wang ◽  
Qi Liu ◽  
Rumin Li ◽  
...  
Keyword(s):  
Schiff Base ◽  
Aqueous Solutions ◽  
Thermodynamic Investigation
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