title: Assessment of molecularly imprinted polymers (MIPs) in the preconcentration of disperse red 73 dye prior to photoelectrocatalytic treatment.
abstract: Magnetic molecularly imprinted polymers (MMIPs) have become a research hotspot due to their two important characteristics: target recognition and magnetic separation. This paper presents the preparation, characterization, and optimization of an MMIP for the preconcentration of disperse red 73 dye (DR73) and its subsequent efficient degradation by photoelectrocatalytic treatment. The MMIPs were characterized by scanning electron microscopy (SEM), which revealed homogeneous distribution of the particles. Excellent encapsulation of magnetite was confirmed by transmission electron microscopy (TEM). A study of dye binding showed that the dye was retained more selectively in the MIP, compared to the NIP. The release of DR73 from the imprinted polymers into methanol and acetic acid was analyzed by UV-Vis spectrophotometry. The extracts showed higher absorbance values for MMIP, compared to MNIP, confirming greater adsorption of dye in the MMIP material. The extracts were then subjected to photoelectrocatalytic treatment. LC-MS/MS analysis following this treatment showed that the dye was almost completely degraded. Hence, the combination of MMIP extraction and photoelectrocatalysis offers an alternative way of selectively removing an organic contaminant, prior to proceeding with its complete degradation.
authors.affiliation: Department of Analytical Chemistry, Institute of Chemistry, São Paulo State University (UNESP), São Paulo, Brazil.
authors.forename: Jefferson Honorio
authors.initials: JH
authors.lastname: Franco
authors.affiliation: Group of Sensors and Biosensors, Autonomous University of Barcelona, Barcelona, Spain.
authors.forename: Alejandra Ben
authors.initials: AB
authors.lastname: Aissa
authors.affiliation: Department of Analytical Chemistry, Institute of Chemistry, São Paulo State University (UNESP), São Paulo, Brazil.
authors.forename: Guilherme Garcia
authors.initials: GG
authors.lastname: Bessegato
authors.affiliation: Group of Sensors and Biosensors, Autonomous University of Barcelona, Barcelona, Spain.
authors.forename: Laura Martinez
authors.initials: LM
authors.lastname: Fajardo
authors.affiliation: Department of Analytical Chemistry, Institute of Chemistry, São Paulo State University (UNESP), São Paulo, Brazil.
authors.forename: Maria Valnice Boldrin
authors.initials: MV
authors.lastname: Zanoni
authors.affiliation: Group of Sensors and Biosensors, Autonomous University of Barcelona, Barcelona, Spain.
authors.forename: María Isabel
authors.initials: MI
authors.lastname: Pividori
authors.affiliation: Department of Analytical Chemistry, Institute of Chemistry, São Paulo State University (UNESP), São Paulo, Brazil. mpilar@iq.unesp.br.
authors.forename: Maria
authors.initials: M
authors.lastname: Del Pilar Taboada Sotomayor
mesh_terms: D000327:Adsorption; D001391:Azo Compounds / Q000737:chemistry*; D002384:Catalysis; D002853:Chromatography, Liquid; D008280:Magnetics; D008855:Microscopy, Electron, Scanning; D046529:Microscopy, Electron, Transmission; D054802:Molecular Imprinting; D055668:Photochemical Processes; D011108:Polymers / Q000737:chemistry; D053719:Tandem Mass Spectrometry
chemical_list: D001391:Azo Compounds; D011108:Polymers; C051919:Fantagen-rubine
keywords: Adsorption; Advanced oxidation process; Molecularly imprinted polymers; Photoelectrocatalytic oxidation; Textile dye degradation; Wastewater treatment