Selective Photooxidation and Photoreduction Processes at Surface-Modified by Grafted Vanadyl

Амаделли, Р.; Samiolo, Luca; Maldotti, Andrea; Molinari, Alessandra; Gazzoli, Delia

doi:10.1155/2011/259453

Cited by 15 publications

(19 citation statements)

References 57 publications

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“…Upon irradiation a spectrum appeared consisting of six lines (a triplet of doublets) with hyperfine splitting constants a N = 15.3 G and a H = 2.7 G assigned to the PBN-OH adduct [46]. Irradiation of the three selected TiO 2 samples led, in all cases, to the oxidation of the alcohol to hydroxy-alkyl radicals (R 2 Á COH) that were trapped by PBN as inferred from the triplet of doublets with a N = 15.5 G and a H = 3.5 G [44,47]. The ratios of intensities of the R 2 Á COH signal were 1.15 and 1.27.…”

Section: Epr Spin-trappingmentioning

confidence: 95%

Preparation and Photoactivity of Nanocrystalline TiO2 Powders Obtained by Thermohydrolysis of TiOSO4

et al. 2013

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Nanocrystalline TiO 2 photocatalysts were synthesized in mild conditions by thermohydrolysis of TiOSO 4 in water at 100°C and post-calcination treatment at various temperatures. The TiO 2 powders were characterized by X-ray diffraction, X-ray photoelectron spectroscopy, specific surface area determinations, scanning electron microscopy and electron paramagnetic resonance measurements. The photoactivity of the samples was tested employing the photodegradation of 4-nitrophenol in liquid-solid regimen and the photooxidation of gaseous 2-propanol. The best results were obtained with the powder calcined at 600°C for 10 h. Surprisingly, the not calcined sample was the most active for the abatement of NO x under irradiation.

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Section: Epr Spin-trappingmentioning

confidence: 95%

Preparation and Photoactivity of Nanocrystalline TiO2 Powders Obtained by Thermohydrolysis of TiOSO4

et al. 2013

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“…Cr(VI) has a toxicity one hundred times higher than that of Cr(III). Advanced oxidation processes have demonstrated their usefulness in cleaning of industrial wastewater [12][13][14]. After the photoreduction of Cr(VI), it can be separated from the suspension by several procedures.…”

Section: Introductionmentioning

confidence: 99%

Photoreduction of Cr(VI) Ions in Aqueous Solutions by UV/ Photocatalytic Processes

Ma¹,

Shen

Lin

2012

International Journal of Photoenergy

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This study discussed the photoreduction of Cr(VI) ions in aqueous solutions by UV/TiO 2 photocatalytic processes under various operational factors. Experimental results showed that the removal rate of Cr(VI) increased with decreasing solution pH values and with increasing dosages of organic compounds, indicating that the recombination rate of electrons and h + can be retarded in the reaction systems by the addition of the scavenger, thus raising the reaction rate of Cr(VI). The relationship of the chemical reaction rate of Cr(VI), TiO 2 dosage, and changes of Cr(VI) concentration was expressed by the pseudo-first-order kinetic equation. Comparing the experimental results of two different doping metals in modified TiO 2 photoreduction systems, the removal rate of Cr(VI) by the Ag/TiO 2 process is larger, possibly because the electron transferring ability of Ag is superior to that of Cu. However, the photoreduction rates of Cr(VI) by modified UV/TiO 2 processes are worse than those by a nonmodified commercial UV/TiO 2 process.

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“…After 30 min of adsorption during dark conditions, a decrease of the UV band is observed occurring at 225 nm and 276 nm. After that, a minimal degradation is observed at the end of adsorption process; during the 60 and 90 minutes of photocatalytic degradation an additional band at 248 nm is observed; this band is assigned to the byproducts formed during the photocatalytic process and according to literature corresponds to the formation of an amino-diol [26,27]. Amino-diol is a byproduct of ATL fragmentation due to the participation of hydroxyl radicals (OH • ) and irradiation UV effect during the photocatalytic degradation reaction.…”

Section: Silver Lixiviation Testmentioning

confidence: 75%

“…According to UV-Vis spectroscopy measurements that indicate a maximum degradation of 80%, for the Ag@H 2 Ti 3 O 7 1.0 catalyst, only a 50% of the ATL is mineralized into CO 2 and water; the remaining 30% is converted into a simple molecule, the byproduct amino-diol [26,27]. The photocatalytic process has a high efficiency when there is a higher percentage of adsorption.…”

Section: Toc Analysismentioning

confidence: 99%

H₂Ti₃O₇ Nanotubes Decorated with Silver Nanoparticles for Photocatalytic Degradation of Atenolol

Hinojosa-Reyes

Camposeco-Solís

Ruíz

et al. 2017

Journal of Nanomaterials

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The photocatalytic degradation/adsorption process of the -blocker atenolol (ATL) under UV irradiation is described using two types of silver decorated catalysts: silver/titania and silver/titanates. The silver ions were reduced on the surface of TiO 2 -P25-Degussa using gallic acid. Silver/titanates were prepared by a microwave-assisted hydrothermal method using the silver/titania as the starting material to obtain the hydrogen titanate (H 2 Ti 3 O 7 ) structure with tubular morphology. These materials were characterized by X-ray diffraction, UV-Vis spectroscopy, N 2 physisorption, temperature programmed reduction, TEM, and FTIR spectroscopy. During the photocatalytic process, the ATL molecules were completely converted to amino-diol byproducts. It is the first time that these materials have been applied during the photocatalytic process in the degradation of pharmaceuticals products. The success of the silver nanoparticles (2 nm) consists of the homogeneous distribution over the surface of titanate nanotubes inhibiting the hole/electron recombination promoting the oxidation process. The Ag@H 2 Ti 3 O 7 with a concentration of silver as 1.0% shows the highest adsorption/degradation of ATL than the Ag@TiO 2 and the P25-Degussa. The great performance in the reuse test consists in the strong attachment of the silver nanoparticles on the titanium surface that inhibits the silver lixiviation during the photocatalytic tests.

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Selective Photooxidation and Photoreduction Processes at Surface-Modified by Grafted Vanadyl

Cited by 15 publications

References 57 publications

Preparation and Photoactivity of Nanocrystalline TiO2 Powders Obtained by Thermohydrolysis of TiOSO4

Preparation and Photoactivity of Nanocrystalline TiO2 Powders Obtained by Thermohydrolysis of TiOSO4

Photoreduction of Cr(VI) Ions in Aqueous Solutions by UV/ Photocatalytic Processes

H₂Ti₃O₇ Nanotubes Decorated with Silver Nanoparticles for Photocatalytic Degradation of Atenolol

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Selective Photooxidation and Photoreduction Processes at Surface-Modified by Grafted Vanadyl

Cited by 15 publications

References 57 publications

Preparation and Photoactivity of Nanocrystalline TiO2 Powders Obtained by Thermohydrolysis of TiOSO4

Preparation and Photoactivity of Nanocrystalline TiO2 Powders Obtained by Thermohydrolysis of TiOSO4

Photoreduction of Cr(VI) Ions in Aqueous Solutions by UV/ Photocatalytic Processes

H2Ti3O7 Nanotubes Decorated with Silver Nanoparticles for Photocatalytic Degradation of Atenolol

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Product

Resources

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H₂Ti₃O₇ Nanotubes Decorated with Silver Nanoparticles for Photocatalytic Degradation of Atenolol