1. Kinetics and statistical approach for 2,5-dichlorophenol degradation in short reaction times by solar TiO2/glass photocatalysis
- Author
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M. M. Morones-Esquivel, José B. Proal-Nájera, Cynthia M. Núñez-Núñez, J. L. Hernández-Mendoza, Luis A. González-Burciaga, and Guillermo Osorio-Revilla
- Subjects
Aqueous solution ,Order of reaction ,010405 organic chemistry ,Chemistry ,General Chemical Engineering ,Chemical oxygen demand ,Kinetics ,Evaporation ,Analytical chemistry ,010402 general chemistry ,01 natural sciences ,0104 chemical sciences ,Absorbance ,Photocatalysis ,Degradation (geology) - Abstract
Aqueous 2,5-dichlorophenol (2,5-DCP) degradation was studied. Degradation was performed by solar photolysis and heterogeneous photocatalysis on TiO2 synthesized by sol-gel method. A thin film solar reactor of 1 m2 surface area was used. Solution was recirculated for 30 min under a laminar regime, with 20° and 26° surface slopes, under different temperatures and radiation. Samples were taken every 5 min to determine chemical oxygen demand (COD) and absorbance at λ= 280 nm. A 23 factorial with covariates and repeated measures experimental design was used to determine degradation kinetics of 2,5-DCP in short reaction times, having two response variables: COD and concentration of 2,5-DCP, determined at 280 nm. The factors were: reactor inclination angles (20° and 26°), flow (355 L/h and 407 L/h) and process (photolysis and photocatalysis); and covariates: solar radiation, temperature, evaporation and initial concentration of 2,5-DCP. By comparing the kinetic constants of both processes using Student-t statistic, significant differences (p
- Published
- 2019
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