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 <0.05) between them were found. Degradation reaction of 2,5-DCP in short times by solar photocatalysis, clearly showed a reaction order n = 1, reaching degradation of 75% (20 min), 83% (25 min) and up to 95% (30 min).
Translated title of the contribution | Kinetics and statistical approach for 2,5-dichlorophenol degradation in short reaction times by solar TiO2/glass photocatalysis |
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Original language | English |
Pages (from-to) | 555-568 |
Number of pages | 14 |
Journal | Revista Mexicana de Ingeniera Quimica |
Volume | 19 |
Issue number | 2 |
DOIs | |
State | Published - 1 May 2020 |
Keywords
- 2,5-dichlorophenol degradation
- Kinetics
- Short reaction times
- Solar heterogeneous photocatalysis
- Statistics