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- Title
Methyl Orange Photo-Degradation by TiO 2 in a Pilot Unit under Different Chemical, Physical, and Hydraulic Conditions.
- Authors
Petrella, Andrea; Spasiano, Danilo; Cosma, Pinalysa; Rizzi, Vito; Race, Marco; Mascolo, Maria Cristina; Ranieri, Ezio; López-Ramón, María V.
- Abstract
The photo-catalytic degradation of a textile azo-dye as Methyl Orange was studied in an innovative unit constituted by a channel over which a layer of titanium dioxide (TiO2) catalyst in anatase form was deposited and activated by UVB irradiation. The degradation kinetics were followed after variation of the chemical, physical, and hydraulic/hydrodynamic parameters of the system. For this purpose, the influence of the TiO2 dosage (g/cm3), dye concentration (mg/L), pH of the solution, flow-rate (L/s), hydraulic load (cm), and irradiation power (W) were evaluated on the degradation rates. It was observed that the maximum dosage of TiO2 was 0.79 g/cm3 while for higher dosage a reduction of homogeneity of the cement conglomerate occurred. The Langmuir–Hinshelwood (LH) kinetic model was followed up to a dye concentration around 1 mg/L. It was observed that with the increase of the flow rate, an increase of the degradation kinetics was obtained, while the further increase of the flow-rate associated with the modification of the hydraulic load determined a decrease of the kinetic rates. The results also evidenced an increase of the kinetic rates with the increase of the UVB intensity. A final comparison with other dyes such as Methyl Red and Methylene Blue was carried out in consideration of the pH of the solution, which sensibly affected the removal efficiencies.
- Subjects
DEGRADATION of textiles; METHYLENE blue; AZO dyes; TITANIUM dioxide
- Publication
Processes, 2021, Vol 9, Issue 2, p205
- ISSN
2227-9717
- Publication type
Article
- DOI
10.3390/pr9020205