title: Epichlorohydrin crosslinked carboxymethyl cellulose-ethylenediamine imprinted polymer for the selective uptake of Cr(VI).
abstract: A new ion-imprinted polymer (IIP) was synthesized from sodium carboxymethyl cellulose and used for the adsorption of hexavalent chromium from aqueous solution. Epichlorohydrin was used to stabilize the polymer before ethylenediamine (EDA) ligand and Cr(VI) were introduced. The obtained IIP was characterized with FTIR, XPS, TGA,13C NMR, SEM, EDX, BET and zeta sizer. The kinetics of adsorption followed a pseudo-second-order model while the Langmuir adsorption isotherm provided the best fit with a maximum adsorption capacity of 177.62mg/g at 25°C. The Langmuir adsorption capacity for the non-imprinted polymer (NIP) at 25°C was 149.93mg/g. Thermodynamic parameters indicated an endothermic process and spontaneous adsorption of Cr (VI) on the polymers. IIP adsorbent was successfully recycled 5 times using 0.1M NaOH as a leachate; 98% Cr(VI) was desorbed during the last adsorption-desorption cycle.
authors.affiliation: Department of Applied Chemistry, University of Johannesburg, Doornfontein, 2028, Johannesburg, South Africa.
authors.forename: Tarisai
authors.initials: T
authors.lastname: Velempini
authors.affiliation: Department of Applied Chemistry, University of Johannesburg, Doornfontein, 2028, Johannesburg, South Africa. Electronic address: kriveshinip@uj.ac.za.
authors.forename: Kriveshini
authors.initials: K
authors.lastname: Pillay
authors.affiliation: Department of Applied Chemistry, University of Johannesburg, Doornfontein, 2028, Johannesburg, South Africa.
authors.forename: Xavier Y
authors.initials: XY
authors.lastname: Mbianda
authors.affiliation: Department of Applied Chemistry, University of Johannesburg, Doornfontein, 2028, Johannesburg, South Africa; Centre for Nanomaterials Science Research, University of Johannesburg, South Africa.
authors.forename: Omotayo A
authors.initials: OA
authors.lastname: Arotiba
mesh_terms: D000327:Adsorption; D002266:Carboxymethylcellulose Sodium / Q000737:chemistry*; D002857:Chromium / Q000737:chemistry* / Q000302:isolation & purification*; D004811:Epichlorohydrin / Q000737:chemistry*; D005029:Ethylenediamines / Q000737:chemistry*; D007700:Kinetics; D054802:Molecular Imprinting; D011108:Polymers / Q000138:chemical synthesis* / Q000737:chemistry; D013816:Thermodynamics
chemical_list: D005029:Ethylenediamines; D011108:Polymers; D004811:Epichlorohydrin; D002857:Chromium; C074702:chromium hexavalent ion; C031234:ethylenediamine; D002266:Carboxymethylcellulose Sodium
keywords: Adsorption; Ethylenediamine; Surface imprinting