Revista: | Revista mexicana de física |
Base de datos: | PERIÓDICA |
Número de sistema: | 000460940 |
ISSN: | 0035-001X |
Autores: | Cedeño, E1 Plazas Saldaña, J3 Gordillo Delgado, F3 Bedoya, A1 Marín, E1 |
Instituciones: | 1Instituto Politécnico Nacional, Ciudad de México. México 2Universidade Estadual de Campinas, Campinas, Sao Paulo. Brasil 3Universidad del Quindío, Armenia, Quindío. Colombia |
Año: | 2018 |
Periodo: | Sep-Oct |
Volumen: | 64 |
Número: | 5 |
Paginación: | 507-511 |
País: | México |
Idioma: | Inglés |
Tipo de documento: | Artículo |
Enfoque: | Analítico, teórico |
Resumen en inglés | In this work, we describe the application of a micro-spatial thermal lens spectroscopy setup (thermal lens microscope, TLM) with coaxial counter-propagating pump, and probe laser beams, and an integrated passive optical Fabry-Perot, to quantify the Cr-VI concentration in water during a photocatalytic reaction in-situ. A series of test samples was analyzed using the 1.5 diphenil carbazide colorimetric method. A calibration curve was obtained by plotting of the TLM signal as a function of the concentration of Cr(VI) in a range between 0 and 10 μg/L (1 𝜇g/L = 1 ppb, part per billion), with a detection limit of 53 ng/L (1 ng/L = 1 ppt, part per trillion). A solution of 10 𝜇g/L Cr(VI) in distillated water was placed into a cell in contact with an iron-incorporated titanium dioxide film, which was previously grown onto a 1 mm thick glass microscope slide by the sol-gel dip-coating technique. The TLM signal was registered as a function of the photocatalysis time measured from the beginning of the process, radiating the film with UV-violet light. The Cr(VI) concentration was determined with the calibration curve and after the first 50 minutes a reduction of 95 % of Cr(VI) was observed, being the chemical reaction kinetic described by a potential time decreasing function |
Disciplinas: | Física y astronomía |
Palabras clave: | Física, Microscopía de lente térmica, Fotocatálisis, Cromo hexavalente, Dióxido de titanio |
Keyword: | Physics, Thermal lens microscopy, Photocatalysis, Hexavalent chromium, Titanium dioxide |
Texto completo: | Texto completo (Ver HTML) Texto completo (Ver PDF) |