Refractive Indices for the Binary Mixtures of N,N-Dimethylformamide with 2-Butanol and 2-Pentanol at Temperatures 303.15 K, 313.15 K, and 323.15 K
Aklima Jahan,
Md. Ashraful Alam,
Md. Ashiqur Rahman Khan,
Shamim Akhtar
Issue:
Volume 7, Issue 4, December 2018
Pages:
55-62
Received:
8 December 2018
Accepted:
20 December 2018
Published:
10 January 2019
DOI:
10.11648/j.ajpc.20180704.11
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Abstract: The refractive index values have been measured as a function of composition range at temperatures 303.15 K, 313.15 K, and 323.15 K and at ambient pressure and reported here. From these data, refractive index deviations, ΔnD, excess molar refraction, RmE, were calculated and correlated by the Redlich-Kister-type polynomial equation to derive the coefficients and estimated the standard deviation values. For both systems, ΔnD were found to be both positive and negative. Excess molar refraction, RmE, versus mole fraction, x1, of N,N-dimethylformamide curves were calculated and found as sigmoid at all temperatures. The variation of these properties with composition and temperature of the binary mixtures were discussed in terms of intermolecular interactions.
Abstract: The refractive index values have been measured as a function of composition range at temperatures 303.15 K, 313.15 K, and 323.15 K and at ambient pressure and reported here. From these data, refractive index deviations, ΔnD, excess molar refraction, RmE, were calculated and correlated by the Redlich-Kister-type polynomial equation to derive the coe...
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An Experimental Investigation of Pristine Barite Adsorption on Sodium Oleate and Sodium Palmitate
Nwoko Christopher Ikpe Amadi,
Nkwoada Amarachi Udoka,
Okoji Josephine,
Opah Solomon
Issue:
Volume 7, Issue 4, December 2018
Pages:
63-72
Received:
15 December 2018
Accepted:
9 January 2019
Published:
28 January 2019
DOI:
10.11648/j.ajpc.20180704.12
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Abstract: Characterization of the pristine barite mineral was established using a scanning electron microscope (SEM) and Fourier Transform Infra-Red (FTIR). Barite was applied for sodium oleate and sodium palmitate adsorption in aqueous solutions. Equilibrium adsorption data were fitted into two adsorption isotherms, three kinetic models and thermodynamic study. The concentration of the ion and pH in the solution proved to be a controlling factor in the adsorption process. Sodium oleate and sodium palmitate soaps adsorbed strongly onto the barite mineral at pH 9 and a temperature of 293k. They result was affected by the high bulk density and chemical resistance nature of barite indicated by successive increase in dosage amount. The effect of concentration and time typically gave a C-type adsorption isotherm. Adsorptive isotherm showed that sodium palmitate adsorption over natural barite was better described by the Langmuir adsorption isotherm while oleate desorption gave a good fitting with Freundlich isotherm. The adsorptive kinetics of sodium palmitate fitted well into pseudo 1 st order and 2nd order kinetics. Intra particle diffusion was not the rate-determining step. Thermodynamic study showed a physio-sorption that was exothermic. Hence the findings showed that pristine barite absorbs at optimum pH and temperature of 9 and 293K.
Abstract: Characterization of the pristine barite mineral was established using a scanning electron microscope (SEM) and Fourier Transform Infra-Red (FTIR). Barite was applied for sodium oleate and sodium palmitate adsorption in aqueous solutions. Equilibrium adsorption data were fitted into two adsorption isotherms, three kinetic models and thermodynamic st...
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