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Development of Recirculating Photocatalytic Reactor with TiO2 Supported on Post-consumption Polystyrene Film: Evaluation of Hazardous Food Colorants Degradation

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Abstract 

This paper describes the development of a recirculating photocatalytic reactor with UV-C radiation and TiO2 supported on polystyrene films obtained from post-consumer packaging. The dye mixture of brilliant blue and erythrosine used in the food industry was treated by UV/H2O2, UV/H2O2/TiO2-suspension, and UV/H2O2/TiO2-supported processes. The degradation kinetics was evaluated, and models with which to predict the concentration of the dye mixture were proposed. A degradation of 100% was achieved after 390 min for 9.2 mmol∙L−1 of H2O2 when using the TiO2 supported (333 mg∙L−1). The catalytic and non-catalytic mathematical models had a good fit for the experimental data, in the case of the recirculating photocatalytic reactor operating a first-order catalytic reaction. The values of the reaction rate constant for the models were 0.0107 ± 0.0054, 0.0178 ± 0.0011, and 0.0341 ± 0.0017 mgdyes∙L−1∙m2∙W−1∙min−1 for the UV/H2O2, UV/H2O2/TiO2-suspension and UV/H2O2/TiO2-supported processes, respectively. The good performance of the reactor developed suggests that it could be used in the degradation of organic components. TiO2 supported on post-consumer polystyrene packaging eliminates the need for the separation step after treatment, thus making it a low-cost process and reducing losses. The material used as a support is an easily available residue. Thus, it can be concluded that the photocatalytic reactor developed is a good alternative for the treatment of food dyes on aqueous media.

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The datasets generated during and/or analyzed during the current study are available from the corresponding author on reasonable request.

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Acknowledgements

The authors are very grateful to the following Brazilian fostering agencies and institutions: Fundação de Amparo à Ciência e Tecnologia de Pernambuco (FACEPE), the Conselho Nacional de Desenvolvimento Científico e Tecnológico—Brasil (CNPq), Fundação de Apoio ao Desenvolvimento da Universidade Federal de Pernambuco (FADE/UFPE), Núcleo de Química Analítica Avançada de Pernambuco (NUQAAPE/FACEPE, APQ-0346-1.06/14 process).

Funding

This study was financed in part by the Coordenação de Aperfeiçoamento de Pessoal de Nível Superior—Brasil (CAPES)—Finance Code 001. The authors would also like to thank Trajano Ltda-ME Company for providing the dyes and Evonik Brasil Ltda Company for providing the TiO2.

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Correspondence to Joan Manuel Rodríguez-Díaz or Marta Maria Menezes Bezerra Duarte.

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de Melo Santos Moura, M.M., do Nascimento, G.E., Sales, D.C.S. et al. Development of Recirculating Photocatalytic Reactor with TiO2 Supported on Post-consumption Polystyrene Film: Evaluation of Hazardous Food Colorants Degradation. Water Air Soil Pollut 233, 513 (2022). https://doi.org/10.1007/s11270-022-05997-9

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  • DOI: https://doi.org/10.1007/s11270-022-05997-9

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