USO DE CARVÕES ATIVADOS PARA REMOÇÃO DE 5-(HIDROXIMETIL)-2-FURALDEIDO (HMF) EM AMOSTRAS DE XAROPES DE AMIDO DE MILHO.

• Autor(a) principal: Nascimento, Patricia Micaelle Klack de Brito do
• Data de Publicação: 2018
• Tipo de documento: Dissertação
• Idioma: por
• Título da fonte: Biblioteca Digital de Teses e Dissertações do UNICENTRO
• Texto Completo: http://tede.unicentro.br:8080/jspui/handle/jspui/1025
• topic: HMF; isotermas; remoção; mel; xarope de amido de milho; adsorção; HMF; isotherms; removal; honey; corn starch syrup; adsorption; CIENCIAS EXATAS E DA TERRA::QUIMICA

This work presents a study of removal of 5-(Hydroxymethyl)-2-furaldehyde (HMF) in corn starch syrups with the use of different activated carbons, pinus (CAP), mineral betuminous (CMB) e mixture of activated carbon plus diatomaceous earth (CAP-TD). Firstly, the physical and chemical characteristics of each material were analyzed through a characterization study being evaluated the parameters: zero charge point, granulometry, scanning electron microscopy (MEV, Microscopia Eletrônica de Varredura, in portuguese), elemental analysis of the sample (EDS análise elemental da amostra, in portuguese), pH, iodine number, ash percentage, molasses index, surface area ( area superficial, in portuguese BET) and analysis of the number of acid and basic groups by titration of Boehm. The determination of HMF concentration in standard aqueous solutions and in the real samples of corn starch syrups were determined by method spectrophotometric. After characterization of the materials, adsorption capacity studies were carried out, evaluating the amount of mass required for adsorption of HMF, as well as the evaluation of the contact time for the adsorption process to occur. From the analysis of the results, it can be verified that for the CAP, CMB and CAP-TD, with masses of 0.05 g, the ideal contact time for that there was adsorption of HMF, it was from 4 minutes for CAP, 5 minutes for CMB and 10 minutes for CAP-TD, with removal rates of 95%, 50% and 57%, respectively. After obtaining the removal rates of HMF by each material in aqueous solutions containing HMF standard, the adsorption capacity of the activated carbon in real samples of corn starch syrups was evaluated. In this second stage, the maximum dosage of carbon required for total removal of HMF by each material was verified, and the application in three different samples was carried out. It was verified that the CAP requires a dosage of 1.200 g, the CMB of 2.200 g, and the CAP-TD de 4.000 g, for removal above 90% of initial concentration of HMF in solution of corn starch syrup. This study showed that activated carbons are efficient in the removal of HMF, reaching concentrations below the allowed limit. Furthermore, they can be used for HMF mitigation, post-processing in industry.