| Revista: | Revista mexicana de física |
| Base de datos: | PERIÓDICA |
| Número de sistema: | 000460940 |
| ISSN: | 0035-001X |
| Autors: | Cedeño, E1 Plazas Saldaña, J3 Gordillo Delgado, F3 Bedoya, A1 Marín, E1 |
| Institucions: | 1Instituto Politécnico Nacional, Ciudad de México. México 2Universidade Estadual de Campinas, Campinas, Sao Paulo. Brasil 3Universidad del Quindío, Armenia, Quindío. Colombia |
| Any: | 2018 |
| Període: | Sep-Oct |
| Volum: | 64 |
| Número: | 5 |
| Paginació: | 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 |
| Disciplines | Física y astronomía |
| Paraules clau: | Física, Microscopía de lente térmica, Fotocatálisis, Cromo hexavalente, Dióxido de titanio |
| Keyword: | Physics, Thermal lens microscopy, Photocatalysis, Hexavalent chromium, Titanium dioxide |
| Text complet: | Texto completo (Ver HTML) Texto completo (Ver PDF) |
