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Generalization of the Flory-Huggins Model for Characterizing the Thermodynamic Properties of Binary Solutions
-- R E Hoehn and J M Honig
The Flory-Huggins model for binary solutions has been reexamined numerically in detail. Calculations
have been executed that show the dependence of various thermodynamic functions on the relative size of the
two constituents and on the degree of their interactions. This has led to the examination of the conditions
needed for phase separation.
© 2009 IUP. All Rights Reserved.
Physicochemical Studies of Some Azomethines of P-Amino Benzoic Acid in Some Solvents at 308.15 K
-- Shipra Baluja, Pranav Inamdar and Jagdish Movaliya
Some physicochemical properties, such as density and heat of solution of some azomethines of p-amino
benzoic acid have been determined in 1, 4-dioxane (DO) and dimethyl formamide (DMF), while conductance in
DMF and dimethyl sulphoxide (DMSO) at 308.15 K.
© 2009 IUP . All Rights Reserved.
Decolorization of Violet 5BN Dye from Textile Wastewater: A Comparison of Different Methods
-- Mausumi Mukhopadhyay, Jyotirmoyi V and Pavithra G
In this study, a comparison of different methods used for the decolorization of violet
5BN dye from textile wastewater was made. The various methods devised for this purpose were
oxidation, coagulation and adsorption separately, and in combination, coagulation with oxidation and adsorption
with oxidation. The efficiency of these methods was compared to select the effective method for 5BN
dye decolorization. The effect of different parameters like time and amount of chemical added were
investigated. Oxidation and its combinations were found to be the most effective methods, with the maximum efficiency
of 99.8% obtained with adsorption. Coagulation with alum, poly-aluminium chloride and adsorbent bagasse
were 86.7%, 71.3% and 76% efficient, respectively.
© 2009 IUP . All Rights Reserved.
Adsorption of Small Molecules on Ti-Zeolites: An Embedded Cluster Approach
-- Ramesh C Deka, Paritosh Mondal and Bulumoni Kalita
The structure and energy of Ti substituted MFI zeolite and its adsorption behavior with small molecules
viz., water, hydrogen peroxide, methanol and ammonia are studied using 5T and 16T model clusters. Full
geometry optimization has been carried out for 5T cluster with B3LYP/6-31G (d,p), LANL2DZ level and 16T cluster
using ONIOM method at B3LYP/6-31G (d, p), LANL2DZ: RHF/3-21G, 3-21G (d) level. The systematic
investigation of adsorption of small molecules on Ti(IV) site of TS-1 shows that ammonia molecule perturbs the
local environment of Ti(IV) to a great extent than water, hydrogen peroxide and methanol.
© 2009 IUP . All Rights Reserved.
Sulfonation Reaction Kinetics of Polystyrene (Ethylene Butylene) Polystyrene
-- Elamathi S, Usha D and Sangeetha D
Sulfonation kinetics of polystyrene-block-poly-(ethylene-ran-butylene)-block-polystyrene (PSEBS) has
been studied using chlorosulfonic acid as the sulfonating agent in chloroform medium. Sulfonation was observed
at 32 °C and 58 °C using UV-visible spectroscopy. Fractional sulfonation has been calculated from the
spectral absorption of the reaction system. The reaction was found to be of the first order with respect to the
concentration of the polymer. The reaction follows the Arrhenius equation over the temperature range of the study (0-58
°C) and the activation energy was calculated to be 3.3 kJ/mol.
© 2009 IUP . All Rights Reserved.
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