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    Separation of chromium (VI) from its liquid solution using new montmorillonite supported with amine based solvent
    (Elsevier Science Bv, 2016) Uslu, Hasan; Datta, Dipaloy; Azizian, Saeid
    The present work deals with the study of Cr (VI) adsorption onto montmorillonite (MM) and modified montmorillonite (MMT). The modification is done by using an amine based solvent, trioctylamine (TOA). Equilibrium and kinetic experiments are carried out to determine the effect of adsorbent dose (w, 0.05 g to 0.3 g for MM, 0.01 g to 0.06 g for MMT), initial Cr (VI) concentration (C-0, 25 mg L-1 to 125 mg L-1), pH (I to 9), and contact time (t, 10 min to 100 min) on the capacity of both the adsorbents. With an increase in the adsorbent dosage, the uptake capacity of MM and MMT for Cr (VI) is found to decrease but with an enhancement in the recovery efficiency. The optimum dosage of MM and MMT is proposed to be 02 g and 0.02 g, respectively. A better adsorption of Cr (VI) is observed at low pH values of aqueous solution, and is decreased with an increase in the value of pH. In the kinetic experiments, the percentage removal of Cr (VI) reaches to a constant value of 70.68% with MM (0.2 g) and 33.92% with MMT (0.02 g) after 80 min. Equilibrium data are analysed by using Langmuir and Freundlich isotherm models. Kinetic models such as pseudo-first order (PFO) and pseudo-second order (PSO) are used to predict the kinetics of the adsorption process by MM and MMT for the Cr (VI) removal. (C) 2016 Elsevier B.V. All rights reserved.
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    Separation of Organic and Inorganic Compounds for Specific Applications
    (Hindawi Publishing Corporation, 2015) Uslu, Hasan; Yankov, Dragomir; Azizian, Saeid; Ullah, Najeeb; Ahmad, Waqar
    Organic and inorganic compounds deal with the structure, properties, and reactions of compounds. Chemists in general and organic chemists in particular can create new molecules never before proposed which, if carefully designed, may have important properties for the betterment of the human experience. Organic and inorganic compounds play important role in industries such as the rubber, plastics, fuel, pharmaceutical, cosmetics, detergent, coatings, dyestuffs, and agrichemicals industries. The foundations of biochemistry, biotechnology, and medicine are built on organic compounds and their role in life processes. Most of the modern, high-technology materials are composed, at least in part, of organic and inorganic compounds. Clearly, separation of organic and inorganic compounds is critically important to our high standard of living. In this respect, we decided to publish this special issue. We have received many article submissions for this special issue. We selected the best 7 of them for publication. This special issue contains 5 original research papers and 2 review articles.