Thermodynamic quantities for the interaction of Cl? with Mg2+, Ca2+ and H+ in aqueous solution from 250 to 325�C

1992 ◽  
Vol 21 (8) ◽  
pp. 761-788 ◽  
Author(s):  
S. E. Gillespie ◽  
J. L. Oscarson ◽  
X. Chen ◽  
R. M. Izatt ◽  
C. Pando
Keyword(s):  
Aqueous Solution ◽  
Thermodynamic Quantities

Thermodynamic quantities for the interaction of SO 4 2? with H+ and Na+ in aqueous solution from 150 to 320�C

1988 ◽  
Vol 17 (9) ◽  
pp. 841-863 ◽  
Author(s):  
J. L. Oscarson ◽  
R. M. Izatt ◽  
P. R. Brown ◽  
Z. Pawlak ◽  
S. E. Gillespie ◽  
...  
Keyword(s):  
Aqueous Solution ◽  
Thermodynamic Quantities

Thermodynamic quantities for the ionization of nitric acid in aqueous solution from 250 to 319�C

1992 ◽  
Vol 21 (8) ◽  
pp. 789-801 ◽  
Author(s):  
J. L. Oscarson ◽  
S. E. Gillespie ◽  
R. M. Izatt ◽  
X. Chen ◽  
C. Pando
Keyword(s):  
Aqueous Solution ◽  
Nitric Acid ◽  
Thermodynamic Quantities

Coordinating Properties of Aromatic and Aliphatic Sulfur with Bivalent Metals in Aqueous Solution. A Calorimetric Study

1979 ◽  
Vol 32 (4) ◽  
pp. 709 ◽  
Author(s):  
R Aruga
Keyword(s):  
Aqueous Solution ◽  
Ionic Strength ◽  
Complex Formation ◽  
Aqueous Medium ◽  
Formation Constants ◽  
Calorimetric Study ◽  
Thermodynamic Quantities ◽  
Direct Calorimetry ◽  
Bivalent Metals

Heats and entropies of complex formation of the thiophen-2-carboxylate ion with Ni2+, Cu2+, Zn2+ and Cd2+ have been determined by direct calorimetry, the formation constants being known from the literature. The measurements were carried out in aqueous medium at 25�C and an ionic strength of 1. The values of the thermodynamic quantities for thiophen-2-carboxylate, compared with those for (ethylthio)acetate and (phenylthio)acetate obtained previously, indicate a greater tendency for aromatic sulfur to form bonds with the above metals than for aliphatic sulfur. The causes of this behaviour are discussed.

Thermodynamic quantities for the interaction of H+ and Na+ with C2H3O 2 ? and Cl? in aqueous solution from 275 to 320�C

1988 ◽  
Vol 17 (9) ◽  
pp. 865-885 ◽  
Author(s):  
J. L. Oscarson ◽  
S. E. Gillespie ◽  
J. J. Christensen ◽  
R. M. Izatt ◽  
P. R. Brown
Keyword(s):  
Aqueous Solution ◽  
Thermodynamic Quantities

Osmotic and activity coefficients of sodium sulphate in water from 150 to 250 °C

1982 ◽  
Vol 60 (13) ◽  
pp. 1754-1758 ◽  
Author(s):  
Om N. Bhatnagar ◽  
A. N. Campbell
Keyword(s):  
Aqueous Solution ◽  
High Pressure ◽  
Activity Coefficients ◽  
Pressure Measurement ◽  
Vapour Pressure ◽  
Pressure Transducer ◽  
Solute Concentration ◽  
Sodium Sulphate ◽  
Thermodynamic Quantities ◽  
High Pressure Cell

Osmotic and activity coefficients of sodium sulphate in aqueous solution have been determined at temperatures up to 250 °C, at solute concentration from 0.3 m to saturation, by measurements of vapour pressure using a newly designed high pressure cell. A precision pressure transducer is used in this cell for pressure measurement. Certain thermodynamic quantities have been calculated from the activity coefficients.

scholarly journals Utilization of Agro-Waste in the Elimination of Dyes from Aqueous Solution: Equilibrium, Kinetic and Thermodynamic Studies

2021 ◽  
Vol 86 ◽  
pp. 11-23
Author(s):  
Nnaemeka John Okorocha ◽  
Chijioke E. Omaliko ◽  
Collins C. Osuagwu ◽  
Maureen O. Chijioke-Okere ◽  
Conrad K. Enenebeaku
Keyword(s):  
Aqueous Solution ◽  
Contact Time ◽  
Adsorption Process ◽  
Dye Adsorption ◽  
Batch Adsorption ◽  
Maximum Adsorption Capacity ◽  
Thermodynamic Quantities ◽  
Order Kinetic ◽  
Maize Cob ◽  
Adsorbent Dose

The prospective of maize cob powder (MCP) as an effective adsorbent for the removal of malachite green (MG) and congo red (CR) dyes from aqueous solution was investigated. The presence of functional groups and pores on maize cob powder were confirmed by FTIR and SEM analysis. Batch adsorption studies were conducted and various parameters such as contact time, adsorbent dosage, initial dye concentration, pH and temperature were examined to observe their effects in the dyes adsorption process. The optimum conditions for the adsorption of MG and CR onto the adsorbent (MCP) was found to be: contact time (60mins), pH (10.0) and temperature (303 K), adsorbent dose (1 g) for an initial MG dye concentration of 50 mg/L and contact time (80mins), pH (2.0) and temperature (343 K) for an initial CR dye concentration of 50 mg/L and adsorbent dose 1.0 g respectively. The experimental equilibrium adsorption data fitted best and well to the Freundlich isotherm model for CR dye adsorption and Langmuir Isotherm for MG adsorption. The maximum adsorption capacity was found to be 13.02 mg/g and 9.41 mg/g for the adsorption of MG and CR dyes respectively. The kinetic data conformed to the pseudo-second-order kinetic model. Thermodynamic quantities such as Gibbs free energy (ΔG0), enthalpy (ΔH0) and entropy (ΔS0) were evaluated and the negative values of ΔG0, ΔH0 and ΔS0 obtained indicated the spontaneous and exothermic nature of the MG adsorption process while positive enthalpy (ΔH0) indicated an endothermic nature of CR adsorption process.

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