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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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(a) X-ray powder diffraction patterns of sample MT-G5 showing the characteristic planes of anatase (A); (b) Micro-Raman spectra at five different sites of MT-G05. * = sample holder.
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ijms-16-01590-f005: (a) X-ray powder diffraction patterns of sample MT-G5 showing the characteristic planes of anatase (A); (b) Micro-Raman spectra at five different sites of MT-G05. * = sample holder.

Mentions: The phase content of P25 Degussa TiO2 is not consistent, and it may vary from batch to batch. Nevertheless, P25 Degussa TiO2 is a mixture of anatase and rutile phases with a predominance of anatase (>80%). Figure 5a shows the XRD pattern of the MT-G5 composite. Despite the low intensity of the peaks, the persistence of the anatase phase was observed (PDF 96-900-9087 from the Crystallography Open Database). The series of composites prepared in this work exhibited similar diffractograms with the main peak corresponding to the (101) plane of anatase at approximately 2θ = 25.32°.


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)

(a) X-ray powder diffraction patterns of sample MT-G5 showing the characteristic planes of anatase (A); (b) Micro-Raman spectra at five different sites of MT-G05. * = sample holder.
© Copyright Policy
Related In: Results  -  Collection

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

ijms-16-01590-f005: (a) X-ray powder diffraction patterns of sample MT-G5 showing the characteristic planes of anatase (A); (b) Micro-Raman spectra at five different sites of MT-G05. * = sample holder.
Mentions: The phase content of P25 Degussa TiO2 is not consistent, and it may vary from batch to batch. Nevertheless, P25 Degussa TiO2 is a mixture of anatase and rutile phases with a predominance of anatase (>80%). Figure 5a shows the XRD pattern of the MT-G5 composite. Despite the low intensity of the peaks, the persistence of the anatase phase was observed (PDF 96-900-9087 from the Crystallography Open Database). The series of composites prepared in this work exhibited similar diffractograms with the main peak corresponding to the (101) plane of anatase at approximately 2θ = 25.32°.

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