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TiO2 immobilized on Manihot carbon: optimal preparation and evaluation of its activity in the decomposition of indigo carmine.

Antonio-Cisneros CM, Dávila-Jiménez MM, Elizalde-González MP, García-Díaz E - Int J Mol Sci (2015)

Bottom Line: Applications of carbon-TiO2 materials have attracted attention in nanotechnology due to their synergic effects.The results indicated that it was possible to use Manihot residues and glycerol to prepare an anatase-containing material with a basic surface and a significant SBET value.The TiO2/carbon eliminated nearly 100% of the dye under UV irradiation using the optimal conditions found by a Taguchi L4 orthogonal array considering the specific surface, temperature and initial concentration.

View Article: PubMed Central - PubMed

Affiliation: Centro de Química -ICUAP, Universidad Autónoma de Puebla Ciudad Universitaria, Edif. H103, Puebla 72570, Mexico.

ABSTRACT
Applications of carbon-TiO2 materials have attracted attention in nanotechnology due to their synergic effects. We report the immobilization of TiO2 on carbon prepared from residues of the plant Manihot, commercial TiO2 and glycerol. The objective was to obtain a moderate loading of the anatase phase by preserving the carbonaceous external surface and micropores of the composite. Two preparation methods were compared, including mixing dry precursors and immobilization using a glycerol slurry. The evaluation of the micropore blocking was performed using nitrogen adsorption isotherms. The results indicated that it was possible to use Manihot residues and glycerol to prepare an anatase-containing material with a basic surface and a significant SBET value. The activities of the prepared materials were tested in a decomposition assay of indigo carmine. The TiO2/carbon eliminated nearly 100% of the dye under UV irradiation using the optimal conditions found by a Taguchi L4 orthogonal array considering the specific surface, temperature and initial concentration. The reaction was monitored by UV-Vis spectrophotometry and LC-ESI-(Qq)-TOF-MS, enabling the identification of some intermediates. No isatin-5-sulfonic acid was detected after a 60 min photocatalytic reaction, and three sulfonated aromatic amines, including 4-amino-3-hydroxybenzenesulfonic acid, 2-(2-amino-5-sulfophenyl)-2-oxoacetic acid and 2-amino-5-sulfobenzoic acid, were present in the reaction mixture.

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Scanning electron microscopy images of the TiO2/carbon composites (left) and EDS spectra obtained at magnification 200× for semi-quantitative analysis (right). MT-G05 (a); MT-G5 (b) and MT-G50 (c).
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ijms-16-01590-f003: Scanning electron microscopy images of the TiO2/carbon composites (left) and EDS spectra obtained at magnification 200× for semi-quantitative analysis (right). MT-G05 (a); MT-G5 (b) and MT-G50 (c).

Mentions: All of the prepared TiO2/carbon composites were black, and their morphologies were similar. Figure 3 shows the SEM images of the samples prepared by mixing the TiO2 slurry with the raw residues in glycerol suspensions (variant (b) in Figure 1): MT-G05 (a), MT-G5 (b) and MT-G50 (c). The incorporation of the TiO2 nanoparticles or aggregates into the striae of the Manihot carbon trunks was possible. The images indicated immobilization of TiO2 agglomerates on the surface of MT-G5 as well as the presence of a free carbonaceous surface. The surface of composite MT-G50 (Figure 3c), which contained 10-fold more TiO2, exhibited a crust of TiO2 covering the carbonaceous surface to a greater extent. For this material, we could expect near semiconductor behavior.


TiO2 immobilized on Manihot carbon: optimal preparation and evaluation of its activity in the decomposition of indigo carmine.

Antonio-Cisneros CM, Dávila-Jiménez MM, Elizalde-González MP, García-Díaz E - Int J Mol Sci (2015)

Scanning electron microscopy images of the TiO2/carbon composites (left) and EDS spectra obtained at magnification 200× for semi-quantitative analysis (right). MT-G05 (a); MT-G5 (b) and MT-G50 (c).
© Copyright Policy
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC4307322&req=5

ijms-16-01590-f003: Scanning electron microscopy images of the TiO2/carbon composites (left) and EDS spectra obtained at magnification 200× for semi-quantitative analysis (right). MT-G05 (a); MT-G5 (b) and MT-G50 (c).
Mentions: All of the prepared TiO2/carbon composites were black, and their morphologies were similar. Figure 3 shows the SEM images of the samples prepared by mixing the TiO2 slurry with the raw residues in glycerol suspensions (variant (b) in Figure 1): MT-G05 (a), MT-G5 (b) and MT-G50 (c). The incorporation of the TiO2 nanoparticles or aggregates into the striae of the Manihot carbon trunks was possible. The images indicated immobilization of TiO2 agglomerates on the surface of MT-G5 as well as the presence of a free carbonaceous surface. The surface of composite MT-G50 (Figure 3c), which contained 10-fold more TiO2, exhibited a crust of TiO2 covering the carbonaceous surface to a greater extent. For this material, we could expect near semiconductor behavior.

Bottom Line: Applications of carbon-TiO2 materials have attracted attention in nanotechnology due to their synergic effects.The results indicated that it was possible to use Manihot residues and glycerol to prepare an anatase-containing material with a basic surface and a significant SBET value.The TiO2/carbon eliminated nearly 100% of the dye under UV irradiation using the optimal conditions found by a Taguchi L4 orthogonal array considering the specific surface, temperature and initial concentration.

View Article: PubMed Central - PubMed

Affiliation: Centro de Química -ICUAP, Universidad Autónoma de Puebla Ciudad Universitaria, Edif. H103, Puebla 72570, Mexico.

ABSTRACT
Applications of carbon-TiO2 materials have attracted attention in nanotechnology due to their synergic effects. We report the immobilization of TiO2 on carbon prepared from residues of the plant Manihot, commercial TiO2 and glycerol. The objective was to obtain a moderate loading of the anatase phase by preserving the carbonaceous external surface and micropores of the composite. Two preparation methods were compared, including mixing dry precursors and immobilization using a glycerol slurry. The evaluation of the micropore blocking was performed using nitrogen adsorption isotherms. The results indicated that it was possible to use Manihot residues and glycerol to prepare an anatase-containing material with a basic surface and a significant SBET value. The activities of the prepared materials were tested in a decomposition assay of indigo carmine. The TiO2/carbon eliminated nearly 100% of the dye under UV irradiation using the optimal conditions found by a Taguchi L4 orthogonal array considering the specific surface, temperature and initial concentration. The reaction was monitored by UV-Vis spectrophotometry and LC-ESI-(Qq)-TOF-MS, enabling the identification of some intermediates. No isatin-5-sulfonic acid was detected after a 60 min photocatalytic reaction, and three sulfonated aromatic amines, including 4-amino-3-hydroxybenzenesulfonic acid, 2-(2-amino-5-sulfophenyl)-2-oxoacetic acid and 2-amino-5-sulfobenzoic acid, were present in the reaction mixture.

Show MeSH
Related in: MedlinePlus