Hierarchically structured TiO 2 -based composites for Fenton-type oxidation processes
A novel hierarchically structured composite aimed as a stable catalyst for the heterogeneous Fenton-type (HFT) oxidation process was developed by using a cost-effective and versatile technique. Prussian Blue nanoparticles (PBNP) were dispersed onto aligned macroporous TiO 2 (rutile) monoliths prepar...
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2019
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| Acceso en línea: | https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_03014797_v236_n_p591_Doumic http://hdl.handle.net/20.500.12110/paper_03014797_v236_n_p591_Doumic |
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paper:paper_03014797_v236_n_p591_Doumic2023-06-08T15:27:57Z Hierarchically structured TiO 2 -based composites for Fenton-type oxidation processes Heterogeneous Fenton-type oxidation Hierarchically structured porous materials Prussian Blue nanoparticles Stability ferrous gluconate hydrogen peroxide hydroxyl radical organic compound oxidizing agent titanium dioxide catalysis catalyst composite dispersion dye experiment hydrogen peroxide mass transfer nanoparticle oxidation oxide porous medium rutile titanium total organic carbon adsorption Article catalyst decomposition Fenton reaction field emission scanning electron microscopy flow rate Fourier transform infrared spectroscopy heat treatment hysteresis liquid mineralization oxidation porosity surface area temperature thermogravimetry X ray diffraction A novel hierarchically structured composite aimed as a stable catalyst for the heterogeneous Fenton-type (HFT) oxidation process was developed by using a cost-effective and versatile technique. Prussian Blue nanoparticles (PBNP) were dispersed onto aligned macroporous TiO 2 (rutile) monoliths prepared via directional freezing of aqueous dispersions of TiO 2 nanoparticles. The catalytic performance was evaluated in the HFT oxidation of an azo dye frequently used as a model contaminant, Orange G (OG). Experiments were carried out in a liquid batch-recycle reactor, in which the liquid flow rate was set to ensure negligible external mass transfer resistance. The catalyst exhibited good activity to form highly oxidative radicals from hydrogen peroxide decomposition, which readily discolored OG. Significant reduction of the time required to attain complete discoloration and improvement in TOC removal were achieved by adjusting operating conditions and oxidant dosage strategies. Almost complete OG conversion at around 90 min and 34.4% of TOC removal after 4 h were achieved by using the best evaluated strategy. The catalyst activity was tested under specific operating conditions and remained unaltered during 42 cycles of 4 h each (total 168 h). The fresh and used PBNP/TiO 2 catalysts and the support were thoroughly characterized by several techniques. Results supported the excellent stability exhibited by the catalyst in the OG HFT oxidation. © 2019 Elsevier Ltd 2019 https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_03014797_v236_n_p591_Doumic http://hdl.handle.net/20.500.12110/paper_03014797_v236_n_p591_Doumic |
| institution |
Universidad de Buenos Aires |
| institution_str |
I-28 |
| repository_str |
R-134 |
| collection |
Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) |
| topic |
Heterogeneous Fenton-type oxidation Hierarchically structured porous materials Prussian Blue nanoparticles Stability ferrous gluconate hydrogen peroxide hydroxyl radical organic compound oxidizing agent titanium dioxide catalysis catalyst composite dispersion dye experiment hydrogen peroxide mass transfer nanoparticle oxidation oxide porous medium rutile titanium total organic carbon adsorption Article catalyst decomposition Fenton reaction field emission scanning electron microscopy flow rate Fourier transform infrared spectroscopy heat treatment hysteresis liquid mineralization oxidation porosity surface area temperature thermogravimetry X ray diffraction |
| spellingShingle |
Heterogeneous Fenton-type oxidation Hierarchically structured porous materials Prussian Blue nanoparticles Stability ferrous gluconate hydrogen peroxide hydroxyl radical organic compound oxidizing agent titanium dioxide catalysis catalyst composite dispersion dye experiment hydrogen peroxide mass transfer nanoparticle oxidation oxide porous medium rutile titanium total organic carbon adsorption Article catalyst decomposition Fenton reaction field emission scanning electron microscopy flow rate Fourier transform infrared spectroscopy heat treatment hysteresis liquid mineralization oxidation porosity surface area temperature thermogravimetry X ray diffraction Hierarchically structured TiO 2 -based composites for Fenton-type oxidation processes |
| topic_facet |
Heterogeneous Fenton-type oxidation Hierarchically structured porous materials Prussian Blue nanoparticles Stability ferrous gluconate hydrogen peroxide hydroxyl radical organic compound oxidizing agent titanium dioxide catalysis catalyst composite dispersion dye experiment hydrogen peroxide mass transfer nanoparticle oxidation oxide porous medium rutile titanium total organic carbon adsorption Article catalyst decomposition Fenton reaction field emission scanning electron microscopy flow rate Fourier transform infrared spectroscopy heat treatment hysteresis liquid mineralization oxidation porosity surface area temperature thermogravimetry X ray diffraction |
| description |
A novel hierarchically structured composite aimed as a stable catalyst for the heterogeneous Fenton-type (HFT) oxidation process was developed by using a cost-effective and versatile technique. Prussian Blue nanoparticles (PBNP) were dispersed onto aligned macroporous TiO 2 (rutile) monoliths prepared via directional freezing of aqueous dispersions of TiO 2 nanoparticles. The catalytic performance was evaluated in the HFT oxidation of an azo dye frequently used as a model contaminant, Orange G (OG). Experiments were carried out in a liquid batch-recycle reactor, in which the liquid flow rate was set to ensure negligible external mass transfer resistance. The catalyst exhibited good activity to form highly oxidative radicals from hydrogen peroxide decomposition, which readily discolored OG. Significant reduction of the time required to attain complete discoloration and improvement in TOC removal were achieved by adjusting operating conditions and oxidant dosage strategies. Almost complete OG conversion at around 90 min and 34.4% of TOC removal after 4 h were achieved by using the best evaluated strategy. The catalyst activity was tested under specific operating conditions and remained unaltered during 42 cycles of 4 h each (total 168 h). The fresh and used PBNP/TiO 2 catalysts and the support were thoroughly characterized by several techniques. Results supported the excellent stability exhibited by the catalyst in the OG HFT oxidation. © 2019 Elsevier Ltd |
| title |
Hierarchically structured TiO 2 -based composites for Fenton-type oxidation processes |
| title_short |
Hierarchically structured TiO 2 -based composites for Fenton-type oxidation processes |
| title_full |
Hierarchically structured TiO 2 -based composites for Fenton-type oxidation processes |
| title_fullStr |
Hierarchically structured TiO 2 -based composites for Fenton-type oxidation processes |
| title_full_unstemmed |
Hierarchically structured TiO 2 -based composites for Fenton-type oxidation processes |
| title_sort |
hierarchically structured tio 2 -based composites for fenton-type oxidation processes |
| publishDate |
2019 |
| url |
https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_03014797_v236_n_p591_Doumic http://hdl.handle.net/20.500.12110/paper_03014797_v236_n_p591_Doumic |
| _version_ |
1768544911957688320 |