Investigation of paracetamol degradation using LED and UV-C photo-reactors
| Autor: | Marcos André Soares Oliveira, Marta Maria Menezes Bezerra Duarte, Joan Manuel Rodríguez-Díaz, Rayany Magali da Rocha Santana, Beatriz Galdino Ribeiro, Graziele Elisandra do Nascimento, Maurício Alves da Motta Sobrinho, Deivson C. S. Sales, Daniella Carla Napoleão |
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| Rok vydání: | 2020 |
| Předmět: |
Environmental Engineering
Chromatography Kinetic model Ultraviolet Rays Chemistry Iron Hydrogen Peroxide 02 engineering and technology Factorial experiment 010501 environmental sciences 021001 nanoscience & nanotechnology medicine.disease_cause 01 natural sciences medicine Degradation (geology) 0210 nano-technology Oxidation-Reduction Escherichia coli Water Pollutants Chemical Degradation reaction Acetaminophen 0105 earth and related environmental sciences Water Science and Technology |
| Zdroj: | Water Science and Technology. 81:2545-2558 |
| ISSN: | 1996-9732 0273-1223 |
| Popis: | This work investigates the efficiency of LED and UV-C photo-reactors for paracetamol degradation using advanced oxidative processes. Among the evaluated processes, photo-Fenton was the most efficient for both radiations. Degradations greater than 81% (λ 197 nm) and 91% (λ 243 nm) were obtained in the kinetic study. These degradations were also observed by means of the reduction in the peaks in both spectral scanning and high-performance liquid chromatography analysis. The good fit of the Chan and Chu kinetic model shows that the degradation reaction has pseudo-first order behavior. Toxicity tests did not indicate the inhibition of growth of Lactuca sativa seeds and Escherichia coli bacterium. However, the growth of strains of the Salmonella enteritidis bacterium was inhibited in all the samples, demonstrating that only this bacterium was sensitive to solutions. The proposed empirical models obtained from the 24 factorial designs were able to predict paracetamol degradation. These models could, at the same levels assessed, be used to predict the percentage of degradation in studies using other organic compounds. The LED and UV-C photo-reactors were, when employing the photo-Fenton process, able to degrade paracetamol, thus highlighting the efficiency of LED radiation when its power (three times smaller) is compared to that of UV-C radiation. |
| Databáze: | OpenAIRE |
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