Author(s):
Adauto, Anais ; Khan, Sabir [UNESP] ; Augusto da Silva, Matheus [UNESP] ; Gomes Neto, José Anchieta [UNESP] ; Picasso, Gino ; Sotomayor, Maria del Pilar Taboada [UNESP]
Date: 2020
Persistent ID: http://hdl.handle.net/11449/200426
Origin: Oasisbr
Subject(s): Atomic absorption spectroscopy; Cadmium (II) adsorption; Hybrid materials; Ion imprinted polymer; Polymers; Atomic absorption spectroscopy; Atomic absorption spectroscopy; Cadmium (II) adsorption; Cadmium (II) adsorption; Hybrid materials; Hybrid materials; Ion imprinted polymer; Ion imprinted polymer; Polymers; Polymers
Description
Made available in DSpace on 2020-12-12T02:06:18Z (GMT). No. of bitstreams: 0 Previous issue date: 2020-08-01
Fondo Nacional de Desarrollo Científico, Tecnológico y de Innovación Tecnológica
Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)
Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq)
Two new ionic imprinted hybrid polymers (IIHP) and their corresponding non imprinted hybrid polymers (NIHP) were synthesized. The prepared IIHP was highly selective to Cd2+. To prepare the IIHP, 1-vinylimidazole (VIN) was used as the functional monomer, (3-mercaptopropyl) trimethoxysilane (MP) or (3-aminopropyl) trimethoxysilane (AMP) was used as the functional organosilane, trimethylolpropane (TRIM) was used as the crosslinking agent, AIBN was used as a radical initiator and TEOS was used as a functional precursor. The functional monomer was selected considering calculations based on the density functional theory (DFT). The fabricated materials were characterized via field emission gun scanning electron microscopy (FEG-SEM), Fourier transform infrared spectroscopy (FTIR), energy dispersive X-ray spectroscopy (EDX) and thermogravimetric analysis (TGA). The maximum adsorption capacity of Cd2+ was achieved at a pH of 7.2 in the tris-HCl medium. The adsorption test indicated that the reaction followed pseudo second order kinetics, and the equilibrium sorption data fitted well into the Langmuir isotherm model. The relative selectivity coefficients of polymers IIHP-VIN-AMP and IIHP-VIN-MP, as evaluated in binary mixtures of Cd2+ and interferent cations (Pb2+, Zn2+, Hg2+, Cu2+, Ni2+, Ca2+, Mg2+, and Na+) at different molar ratios, were greater than one due to the presence of specific recognition sites for Cd2+ ions. Moreover, the selective materials exhibited a high reusability and reproducibility in the context of Cd2+ adsorption. These adsorbent materials, specifically IIHP-VIN-MP, exhibited a % removal efficiency of more than 90% for the Cd2+ in river water samples.
Laboratory of Physical Chemistry Research Faculty of Sciences National University of Engineering, Av. Tupac Amaru 210
Department of Analytical Chemistry Institute of Chemistry State University of São Paulo (UNESP)
National Institute for Alternative Technologies of Detection Toxicological Evaluation and Removal of Micropollutants and Radioactives (INCT-DATREM)
Department of Analytical Chemistry Institute of Chemistry State University of São Paulo (UNESP)
Fondo Nacional de Desarrollo Científico, Tecnológico y de Innovación Tecnológica: # 237-2015
Fondo Nacional de Desarrollo Científico, Tecnológico y de Innovación Tecnológica: #023-2019
FAPESP: #2014/25264–3
FAPESP: #2014/50945–4
CNPq: #306650/2016–9
CNPq: #465571/2014–0
