| Autor: |
Vanichvattanadecha, Chutima, Jaroenworaluck, Angkhana, Henpraserttae, Pimpun, Wimuktiwan, Panida, Manpetch, Panlekha, Singhapong, Wadwan |
| Zdroj: |
Journal of Porous Materials; Aug2021, Vol. 28 Issue 4, p1137-1153, 17p |
| Abstrakt: |
SBA-16, a kind of highly ordered mesoporous silica, was synthesized via a sol–gel method used as the supporter of TiO2 nanoparticles. With variation of Si/Ti molar ratios at 5.6, 1.4 and 0.7, SBA-16/TiO2 nanocomposites were prepared. In this study, pristine TiO2 was also synthesized as a control sample. Prior use, as-synthesized powders were calcined at 500 °C for 4 h. Physicochemical properties of the calcined powders were characterized by using various techniques. Degradation studies of a commercial paraquat (PQ) herbicide, having blue color from addition of the unknown dye, were performed using the SBA-16/TiO2 nanocomposites compared with the SBA-16 support and the pristine TiO2. Experimental results showed that the blue colors of the solutions were faded very quickly within 30 min when tested with SBA-16 and 5.6 SBA-16/TiO2 in dark conditions. The solutions were completely decolorized when the UV light was on for all composites and the pristine TiO2. The degradation of the dye was mainly depended on the adsorption process on SBA-16 surfaces. Photodegradation of PQ in the solutions was started by the nanocomposites and TiO2 tested under UV illumination conditions. The dye was completely degraded and the concentrations of PQ in the prepared solutions were reduced and reached to the maximum reduction at 70% within 24 h by 1.4 SBA-16/TiO2. Kinetic mechanisms for the differences of degradation characteristics by the catalysts under light-on and off conditions were studied, discussed and modelled. [ABSTRACT FROM AUTHOR] |
| Databáze: |
Complementary Index |
| Externí odkaz: |
|
Full text from SpringerLink