title: Influence of exchange group of modified glycidyl methacrylate polymer on phenol removal: A study by batch and continuous flow processes.
abstract: Contamination of water by phenol is potentially a serious problem due to its high toxicity and its acid character. In this way some treatment process to remove or reduce the phenol concentration before contaminated water disposal on the environment is required. Currently, phenol can be removed by charcoal adsorption, but this process does not allow easy regeneration of the adsorbent. In contrast, polymeric resins are easily regenerated and can be reused in others cycles of adsorption process. In this work, the interaction of phenol with two polymeric resins was investigated, one of them containing a weakly basic anionic exchange group (GD-DEA) and the other, a strongly basic group (GD-QUAT). Both ion exchange resins were obtained through chemical modifications from a base porous resin composed of glycidyl methacrylate (GMA) and divinyl benzene (DVB). Evaluation tests with resins were carried out with 30 mg/L of phenol in water solution, at pH 6 and 10, employing two distinct processes: (i) batch, to evaluate the effect of temperature, and (ii) continuous flow, to assess the breakthrough of the resins. Batch tests revealed that the systems did not follow the model proposed by Langmuir due to the negative values obtained for the constant b and for the maximum adsorption capacity, Q0. However, satisfactory results for the constants KF and n allowed assuming that the behavior of systems followed the Freundlich model, leading to the conclusion that resin GD-DEA had the best interaction with the phenol when in a solution having pH 10 (phenoxide ions). The continuous flow tests corroborated this conclusion since the performance of GD-DEA in removing phenol was also best at pH 10, indicating that the greater availability of the electron pair in the resin with the weakly basic donor group contributed to enhance the resin's interaction with the phenoxide ions.
authors: Federal Institute of Education, Science and Technology of Rio de Janeiro (IFRJ), Av. República do Paraguai, 120, 25050-100, Duque de Caxias, RJ, Brazil; Federal University of Rio de Janeiro, Science and Technology of Polymers Program, Av. Horácio Macedo, 2030, Block J, Cidade Universitária, 21941-598, Rio de Janeiro, RJ, Brazil. Electronic address: thiago.aversa@ifrj.edu.br.
authors: Thiago Muza
authors: TM
authors: Aversa
authors: Federal University of Rio de Janeiro, Science and Technology of Polymers Program, Av. Horácio Macedo, 2030, Block J, Cidade Universitária, 21941-598, Rio de Janeiro, RJ, Brazil.
authors: Carla Michele Frota
authors: CMF
authors: da Silva
authors: Federal University of Rio de Janeiro, Science and Technology of Polymers Program, Av. Horácio Macedo, 2030, Block J, Cidade Universitária, 21941-598, Rio de Janeiro, RJ, Brazil.
authors: Paulo Cristiano Silva
authors: PCS
authors: da Rocha
authors: Federal University of Rio de Janeiro, Science and Technology of Polymers Program, Av. Horácio Macedo, 2030, Block J, Cidade Universitária, 21941-598, Rio de Janeiro, RJ, Brazil; Federal University of Rio de Janeiro, Metallurgy and Materials Engineering Program, Av. Horácio Macedo, 2030, Block F, Cidade Universitária, 21941-598, Rio de Janeiro, RJ, Brazil.
authors: Elizabete Fernandes
authors: EF
authors: Lucas
mesh_terms: D000327:Adsorption; D004852:Epoxy Compounds / Q000737:chemistry*; D006801:Humans; D007475:Ion Exchange Resins; D008689:Methacrylates / Q000737:chemistry*; D019800:Phenol / Q000737:chemistry*; D011108:Polymers; D062065:Wastewater; D014874:Water Pollutants, Chemical / Q000737:chemistry*; D018508:Water Purification / Q000379:methods
chemical_list: D004852:Epoxy Compounds; D007475:Ion Exchange Resins; D008689:Methacrylates; D019800:Phenol; D011108:Polymers; D062065:Wastewater; D014874:Water Pollutants, Chemical; C007870:glycidyl methacrylate
keywords: Adsorption; Bacth and continuous flow processes; Crosslinked poly(glycidyl methacrylate); Isotherm models; Phenol; Water treatment