calculated from model-free KAS and FWO methods. The optimized value of the E a and A have been calculated using the best equation. Also, the other thermodynamicfunctions (Δ H *, Δ S *, and ΔG*) have been obtained using these values
The molar heat capacities of the binary mixture composed of water and n-butanol were measured with an adiabatic calorimeter in the temperature range 78–320 K. The functions of the heat capacity with respect to thermodynamic temperature were established. A glass transition, solid–solid phase transition and solid–liquid phase transition were observed. The corresponding enthalpy and entropy of the solid–liquid phase transition were calculated, respectively. The thermodynamic functions relative to a temperature of 298.15 K were derived based on the relationships of the thermodynamic functions and the function of the measured heat capacity with respect to temperature.
Authors:P. Gauden, G. Rychlicki, A. Terzyk, and R. Wojsz
A new adsorption isotherm equation based on the extension of the potential theory of adsorption on microporous fractal solids
and corresponding thermodynamic functions were formulated and applied for description of the experimental data of adsorption
on a microporous carbon. The comparison of the obtained results with the original Dubinin-Astakhov equation is presented.
In this paper the dependence of thermodynamic functions (the differential molar enthalpy of adsorption ΔH and the differential
molar entropy of adsorption ΔS) on the fractal dimension D are discussed, as well.
Authors:V. Drebushchak, Yulia Kovalevskaya, I. Paukov, and Elena Boldyreva
Heat capacity of D- and DL-serine was measured using adiabatic calorimetry in a temperature range of 5.5 to 300 K, and then thermodynamic functions
were calculated. The difference in heat capacity (CPD-CPDL) between two species indicates a small anomaly in D-serine near 15 K and a systematic excess over DL for temperatures > 30 K. This is much larger, than a difference in thermodynamic functions measured so far for the polymorphs
of organic molecular crystals. The excess is fitted well to Einstein contribution with characteristic temperature of 185 K
which is equivalent to vibrational mode at 129 cm−1.
Solvent extraction on Zr(IV) were carried out at 5, 25 and 40 °C using Amberlite LA-2, TBP and HDEHP in toluene or kerosene from solutions of HCl, HBr or KI. The equilibrium constant Kex as well as the thermodynamic functions DG°, DH° and DS° of the nine extraction systems were deduced. The overall extraction equilibria were postulated from the obtained data.
Authors:Shao Hua, Han Jing-Tian, Sun Guo-Xin, Bao Bo-Rong, and Sun Si-Xiu
The extraction of uranium(VI) from nitric acid by N-octanoylpiperidine (OPPD) in toluene has been investigated at varying concentrations of nitric acid, extractant, salting-out agent LiNO3 and at different temperatures. The mechanism of extraction is discussed in the light of the results obtained. The extracted species have also been investigated using FT-IR spectrometry. The related thermodynamic functions were calculated.
Authors:M. Abd El Wahed, E. Nour, S. Teleb, and S. Fahim
Complexes of adenine, AdH, with cobalt, nickel and copper chlorides were prepared and their thermodynamic functions were determined.
The complexing processes are endothermic in nature. The thermal behaviour of complexes was followed up by using TG and DTA
analyses. The stoichiometry of thermal decomposition of the investigated complexes was suggested.
The extraction of Eu3+ from perchloric acid by ethyl hydrogen benzyl phosphonate (HEBP) dissolved in a series of organic diluents, has been studied at different temperatures. From the variation of the distribution ratio with temperature, the thermodynamic functions H, S and G have been determined. The meaning of the experimentally obtained thermodynamic quantities is discussed.
The extraction of U(VI) with newly synthesized long chain alkyl amide, N,N-dibutyldodecanamide (DBDA), in toluene has been studied. The dependence of the extraction on nitric acid and DBDA concentrations and temperature from nitric acid solution has been considered. The extracted species has also been investigated using FT-IR spectrometry. The related thermodynamic functions were calculated. The separation factor between U(VI) and Th(IV) is higher and there is no third phase formation under the conditions studied.