Synthesis, characterization and application of a novel ion hybrid imprinted polymer to adsorb Cd(II) in different samples

Autor(es)

Adauto, Anais ^[1] ; Khan, Sabir ^{[2, 1]} ; da Silva, Matheus Augusto ^[2] ; Gomes Neto, Jose Anchieta ^[2] ; Picasso, Gino ^[1] ; Taboada Sotomayor, Maria del Pilar ^{[2, 3]}

Afiliação do(s) autor(es)

^[1] Natl Univ Engn, Fac Sci, Lab Phys Chem Res, Av Tupac Amaru 210, Lima - Peru

^[2] State Univ Sao Paulo UNESP, Inst Chem, Dept Analyt Chem, BR-14801970 Araraquara, SP - Brazil

^[3] Natl Inst Alternat Technol Detect Toxicol Evaluat, Araraquara, SP - Brazil

• Tipo de documento: Artigo Científico
• Fonte: Environmental Research; v. 187, AUG 2020.
• Citações Web of Science: 0

Resumo

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. (AU)

• Processo FAPESP: 14/50945-4 - INCT 2014: Instituto Nacional de Tecnologias Alternativas para Detecção, Avaliação Toxicológica e Remoção de Micropoluentes e Radioativos
• Beneficiário: Maria Valnice Boldrin
• Modalidade de apoio: Auxílio à Pesquisa - Temático
• Processo FAPESP: 14/25264-3 - Desenvolvimento e aplicação de novos sensores químicos nanoestruturados baseados em polímeros biomiméticos
• Beneficiário: Maria Del Pilar Taboada Sotomayor
• Modalidade de apoio: Auxílio à Pesquisa - Regular