title: Ion-imprinted modified chitosan resin for selective removal of Pd(II) ions.
abstract: In this work, a selective Pd(II) ions chelating resin based on 2-aminobenzaldehyde modified chitosan Schiff's base (Pd-CAZ) was synthesized through ion-imprinting technique. All the performed chemical and morphological changes during the modification and Pd(II) ion-imprinting process were investigated using instrumental techniques including FTIR, (1)H NMR, XRD and SEM. In addition, the mechanism of Pd(II) binding to the synthesized polymeric active sites was elucidated using both XPS and FTIR spectra, and the results indicated that Pd(II) ions coordinated in square planar geometry. Also, the selective extraction experiments with respect to Pd-CAZ and control non-imprinted NI-CAZ resins were performed to obtain the fundamental thermodynamic, kinetic and isotherm parameters. In all cases the adsorption was endothermic, spontaneous, fit well with pseudo-second order kinetic model and Langmuir adsorption isotherm model with maximum adsorption capacities of 275±0.4 and 114±0.2 mg/g for Pd-CAZ and NI-CAZ, respectively. Moreover, the regeneration and recovery experiments indicated that the resin maintain about 96% of its original activity after the fifth adsorption-desorption cycle, revealing the high economic value.
authors.affiliation: Chemistry Department, Deanery of Academic Services, Taibah University, Yanbu Branch, Yanbu El-Bahr, Saudi Arabia; Chemistry Department, Faculty of Science, Mansoura University, Mansoura, Egypt. Electronic address: monierchem@yahoo.com.
authors.forename: M
authors.initials: M
authors.lastname: Monier
authors.affiliation: Chemistry Department, Deanery of Academic Services, Taibah University, Yanbu Branch, Yanbu El-Bahr, Saudi Arabia; Chemistry Department, Faculty of Science, Mansoura University, Mansoura, Egypt. Electronic address: doaasaif@yahoo.com.
authors.forename: D A
authors.initials: DA
authors.lastname: Abdel-Latif
authors.affiliation: Chemistry Department, Faculty of Science, Mansoura University, Mansoura, Egypt.
authors.forename: Y G
authors.initials: YG
authors.lastname: Abou El-Reash
mesh_terms: D000327:Adsorption; D001547:Benzaldehydes / Q000737:chemistry; D048271:Chitosan / Q000737:chemistry*; D006863:Hydrogen-Ion Concentration; D007477:Ions / Q000737:chemistry / Q000302:isolation & purification; D007700:Kinetics; D015394:Molecular Structure; D010165:Palladium / Q000737:chemistry / Q000302:isolation & purification*; D010316:Particle Size; D012117:Resins, Synthetic / Q000737:chemistry*; D012545:Schiff Bases / Q000737:chemistry; D013499:Surface Properties; D013816:Thermodynamics
chemical_list: D001547:Benzaldehydes; D007477:Ions; D012117:Resins, Synthetic; D012545:Schiff Bases; C000062:2-aminobenzaldehyde; D010165:Palladium; D048271:Chitosan
keywords: Chitosan; Ion-imprinting; Palladium ion; Schiff base