Formation of TiO2 photoanodes by simultaneous electrophoretic deposition of anatase and rutile particles for photoassisted electrolytic copper ions removal

Peralta-Ruiz, Yeimmy; Lizcano-Beltrán, Erika M.; Laverde, Dionisio; Acevedo–Peña, Próspero; Córdoba, E.M.

doi:10.1590/s0100-40422012000300011

Cited by 12 publications

(9 citation statements)

References 29 publications

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“…In this context, photoelectrocatalysis (PEC) using semiconductor materials such as titanium oxide (TiO 2 ), which is low-cost, chemically stable and quantum efficient 3 , has emerged as one of the most promising advanced oxidation processes for the removal of contaminants from natural water sources. In order to perform TiO 2 PEC, photon illumination with a wavelength equal or less than 388 nm is required, which corresponds to the ultraviolet (UV) region and promotes the generation of electron-hole pairs that contribute to the redox process [3][4][5] . However, the sunlight spectrum has its maximum radiation between 400-700 nm, and only a small fraction of this range corresponds to UV light.…”

Section: Introductionmentioning

confidence: 99%

N and F Codoped TiO2 Thin Films on Stainless Steel for Photoelectrocatalytic Removal of Cyanide Ions in Aqueous Solutions

et al. 2017

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N-F codoped TiO 2 films were immobilized on stainless steel sheets through a combined approach involving a dip-coating technique and a hydrothermal treatment, followed by calcination at 400°C in the presence of air. Photocatalyst characterization was conducted using XRD, Raman and UV-VIS spectroscopy as well as SEM. The films were tested in a three-electrode cell for the photoelectrocatalytic degradation of CN-containing compounds. The results showed that the increase in the degradation rate of CN-containing compounds is both influenced by a synergistic effect of the doping agents and strongly dependent on the concentration of CN-containing compounds in the solution. Nitrogen contributed to the enhanced photoactivity under visible light due to the generation of localized states within the band gap of TiO 2 , whereas the presence of fluoride improved the superficial properties of the film, which resulted in higher amounts of CN-containing compounds that were degraded by direct charge transfer through the photogenerated holes.

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Section: Introductionmentioning

confidence: 99%

N and F Codoped TiO2 Thin Films on Stainless Steel for Photoelectrocatalytic Removal of Cyanide Ions in Aqueous Solutions

et al. 2017

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“…Given these characteristics, TiO 2 is the most commonly employed material in photocatalytic applications. [1][2][3] Several techniques have been employed in the fabrication of TiO 2 thin films: Sputtering, 4 electrophoretic deposition, 5,6 sol-gel deposition, 7 and spray pyrolysis, 8 to cite the most common. Amongst these, the sol-gel route is the widest used, due to the low sintering temperatures required, process versatility and homogeneity at the molecular level.…”

Section: Introductionmentioning

confidence: 99%

Enhanced photocatalytic activity of TiO2 films by modification with polyethylene glycol

Ramírez‐Santos¹,

Acevedo–Peña²,

Córdoba³

2012

Quím. Nova

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Recebido em 15/1/12; aceito em 22/6/12; publicado na web em 18/9/12 Titanium dioxide porous thin films on the Anatase phase were deposited onto glass slides by the sol-gel method assisted with polyethylene glycol (PEG). The dip-coated films were characterized using scanning electron microscopy (SEM), thermogravimetric analysis (TGA and DTG), UV-visible spectroscopy and X-ray diffraction (XRD). The photocatalytic activity of the films was determined by means of methyl-orange oxidation tests. The resultant PEG-modified films were crack-free and developed a porous structure after calcination at 500 °C. Photo-oxidation tests showed the dependency of catalytic activity of the films on the number of layers (thickness) and porosity, i.e. of the interfacial area.

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“…En la muestra de LDSR se observan los picos 2θ a 26.6° [17] y 28.6° que corresponden a la presencia de óxido de silicio. La muestra de HDSR presentó picos a 27.8° que corresponde a TiO2 [18], a 48.8º que corresponde a óxido de silicio [19] y a 47.7º que indica la presencia de ZnO [20]. Ambas muestras presentaron picos 2θ a 29.…”

Section: Hdvw Ldvwunclassified

Estudio de las propiedades termo-mecánicas y de inflamabilidad de mezclas poliméricas de PP con residuos sólidos pirolíticos de desechos vehiculares

Baca¹,

Tupayachy-Quispe²,

Vilca³

et al. 2019

Proceedings of the 17th LACCEI International Multi-Conference for Engineering, Education, and Technology: “Industry, Innovation

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The final disposal of vehicles out of use gives rise to an environmental issue, so that, in Europe there are companies dedicated to the disassembly and recovery of those components that can be reused, among these components are plastic waste. In the present research, it is proposed to treat those plastics through a pyrolytic process with the purpose of transforming them into solid residue, in order to be used as part of the additives in a flame retardant system in a polypropylene matrix. Vehicle wastes were segregated by relative density method (ASTM D 792-08), characterized and were subsequently incorporated into a process of thermal pyrolysis. Using the resultant pyrolytic solid residue (PSR), a polymer mixture was prepared which had the polypropylene as matrix. Its thermal, mechanical and flammability properties were evaluated through the Thermogravimetric analysis, Modulus of elasticity, Tensile strength, Percentage of deformation and the Limiting oxygen index. Vehicle waste (DPV) are formed by 82.97% of high density residue, which allowed to obtain 32.08% of High density pyrolytic solid residue (HDSR), while using low density waste, 6.69% of Low density pyrolytic solid waste (LDSR) was obtained. Regarding its thermo-mechanical and flammability properties, it was noted that adding the PSR obtained from low density and high density wastes influenced the properties of the polypropylene matrix. As for their mechanical properties, if we compare the matrix formed by polypropylene and retarding additives with and without PSR; the maximum strength in the polypropylene matrix with LDSR showed a slight decrease, while the matrix with HDSR showed a slight increase. In addition, in the LDSR and HDSR samples, the percentage of deformation of the material decreased by 52.02% and 49.17%, respectively. While the modulus of elasticity was increased by 30.12% for the sample with LDSR and 30.73% with HDSR. Likewise, the addition of PSR did not increase its flame retardant activity since the Limiting oxygen index value remained the same as when flame retardant additives were added, in 30%; while with HDSR it decreased to 29%. This indicates that the composition of the above-mentioned solid residues favors to the polypropylene composites considering that the addition of the PSR brought with it the decrease of the concentration of other additives used and of the polypropylene. This due to the chemical composition of the pyrolytic solid residues that act as a source of carbon and flame retardant minerals reinforcing their fireproof properties.

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Formation of TiO2 photoanodes by simultaneous electrophoretic deposition of anatase and rutile particles for photoassisted electrolytic copper ions removal

Cited by 12 publications

References 29 publications

N and F Codoped TiO2 Thin Films on Stainless Steel for Photoelectrocatalytic Removal of Cyanide Ions in Aqueous Solutions

N and F Codoped TiO2 Thin Films on Stainless Steel for Photoelectrocatalytic Removal of Cyanide Ions in Aqueous Solutions

Enhanced photocatalytic activity of TiO2 films by modification with polyethylene glycol

Estudio de las propiedades termo-mecánicas y de inflamabilidad de mezclas poliméricas de PP con residuos sólidos pirolíticos de desechos vehiculares

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