Yazar "Taqvi, Syed I. H." seçeneğine göre listele

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    A comparative study and evaluation of magnetic and nonmagnetic hydrogels towards mitigation of di butyl and di ethyl hexyl phthalate from aqueous solutions
    (ELSEVIER SCIENCE BV, 2016) Qureshi, Umair A.; Gübbük, İlkay Hilal; Ersöz, Mustafa; Solangi, Amber R.; Taqvi, Syed I. H.; Memon, Saima Q.
    This study was focused on preparation of a new hydrogel adsorbent material based on chitosan, polyvinyl alcohol and magnetic particles. These materials were prepared by varying their ratio and were compared with each other in terms of swelling and adsorption performance for two model endocrine disrupting compounds i.e. dibutyl phthalate (DBP) and diethyl hexyl phthalate (DEHP). Two gels (gel 0 and CS 0.5) were selected for differentiating their adsorption efficiencies as a function of pH, time, concentrations, temperature and interference in batch mode against toxic phthalates. Among the two gels, CS 0.5 was found to be promising than gel 0 and showed better performance toward DBP and DEHP removal. The adsorption mechanism was found to be dominated by hydrogen bonding on gel 0. Additionally, complexation interaction and hydrophobic interactions on CS 0.5 were playing crucial role. The gels can be applied effectively for the elimination of DBP and DEHP pollution from waste water. (C) 2015 Taiwan Institute of Chemical Engineers. Published by Elsevier B.V. All rights reserved.
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    Preparation of polyaniline montmorillonite clay composites for the removal of diethyl hexyl phthalate from aqueous solutions
    (TAYLOR & FRANCIS INC, 2016) Qureshi, Umair A.; Gübbük, İlkay Hilal; Ersöz, Mustafa; Solangi, Amber R.; Taqvi, Syed I. H.; Memon, Saima Q.
    The work presents the synthesis of polyaniline functionalized montmorillonite (PANI/MMT) clay composites and evaluation of their performance as an adsorbent for the mitigation of toxic diethyl hexyl phthalate (DEHP) from water. The formation of composite was confirmed by different analytical techniques such as FTIR, zeta potential analysis, XRD, SEM, and AFM. The adsorption capacity of PANI/MMT was superior to MMT. DEHP followed partition mechanism on PANI/MMT whereas MMT favored surface adsorption mechanism. The performance of PANI/MMT for DEHP removal was unaffected by the change in pH of solution, change in salinity, and hardness contents in aqueous system and consecutive adsorption desorption cycles compared to MMT. Furthermore, both PANI/MMT and MMT exhibited greater adsorption capacities as compared to the previously published work and showed satisfactory performance in real water samples.