title: Introduction of double amidoxime group by double post surface modification on poly(vinylbenzyl chloride) beads for higher amounts of organic dyes, As (V) and Cr (VI) removal.
abstract: In this study, the synthesis of micron-sized poly(vinylbenzyl chloride) (p(VBC)) beads and subsequent conversion of the reactive chloromethyl groups to double amidoxime group containing moieties by post modification is reported. The prepared beads were characterized by SEM and FT-IR spectroscopy. The amidoximated p(VBC) beads were used as adsorbent for the removal of organic dyes, such as eosin y (EY) and methyl orange (MO), and heavy metals containing complex ions such as dichromate (Cr2O7(2-)) and arsenate (HAsO4(2)(-)) from aqueous media. The effect of the adsorbent dose on the percent removal, the effect of initial concentration of adsorbates on the adsorption rate and their amounts were also investigated. The Langmuir, Freundlich and Temkin adsorption isotherms were applied to the adsorption processes. The results indicated that the adsorption of both dichromate and arsenate ions obeyed the Langmuir adsorption model. Interestingly, it was found that the prepared beads were capable of removing significant amounts of arsenate and dichromate ions from tap and river (Sarıcay, Canakkale-Turkey) water.
authors.affiliation: Department of Chemistry, Quaid-i-Azam University, Islamabad 45320, Pakistan.
authors.forename: Muhammad
authors.initials: M
authors.lastname: Ajmal
authors.affiliation: Canakkale Onsekiz Mart University, Faculty of Science & Arts, Chemistry Department, Terzioglu Campus, 17100 Canakkale, Turkey; Nanoscience and Technology Research and Application Centers (NANORAC), Canakkale Onsekiz Mart University, 17100 Canakkale, Turkey.
authors.forename: Sahin
authors.initials: S
authors.lastname: Demirci
authors.affiliation: Faculty of Pharmacy, Yuzuncu Yil University, Campus, Van 65080, Turkey.
authors.forename: Yusuf
authors.initials: Y
authors.lastname: Uzun
authors.affiliation: Department of Chemistry, Quaid-i-Azam University, Islamabad 45320, Pakistan.
authors.forename: Mohammad
authors.initials: M
authors.lastname: Siddiq
authors.affiliation: Chemical Engineering Departments, Yuzuncu Yil University, Campus, Van 65080, Turkey.
authors.forename: Nahit
authors.initials: N
authors.lastname: Aktas
authors.affiliation: Canakkale Onsekiz Mart University, Faculty of Science & Arts, Chemistry Department, Terzioglu Campus, 17100 Canakkale, Turkey; Nanoscience and Technology Research and Application Centers (NANORAC), Canakkale Onsekiz Mart University, 17100 Canakkale, Turkey. Electronic address: sahiner71@gmail.com.
authors.forename: Nurettin
authors.initials: N
authors.lastname: Sahiner
keywords: Adsorption of dyes/arsenate and dichromate ion; Chemical modification; Microgel; Polymeric beads; Surface modification