Resource efficiency analysis for photocatalytic degradation and mineralization of estriol using TiO2 nanoparticles

Ramírez-Sánchez, Irwing M.; Tuberty, Shea R.; Hambourger, Mike; Bandala, Erick R.

doi:10.1016/j.chemosphere.2017.06.046

Cited by 26 publications

(14 citation statements)

References 68 publications

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“…The photocatalytic standard was Aeroxide ® TiO 2 P25, and the load was 20 mg L −1 . The choice of catalyst load was based on our previous work on • OH generation of Aeroxide ® TiO 2 P25 [16]. For zero-iron TiO 2 and Fe-TiO 2 materials, the catalyst load used was 320 mg L −1 , which produced a • OH generation rate under high UV irradiation to set a baseline.…”

Section: Hydroxyl Radical Generationmentioning

confidence: 99%

“…Although there are many known AOPs, since Coleman's work [12], photocatalysis using titanium dioxide (TiO2) has been identified as one of the most effective methods to degrade estrogens in water [13]. Several reports recognized that TiO2 can degrade estrogens, which prevents increases in estrogenic activity in water [14,15] and partially or completely mineralizing estrogens [14,16].…”

Section: Introductionmentioning

confidence: 99%

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Photocatalytic Degradation of Estriol Using Iron-Doped TiO2 under High and Low UV Irradiation

Ramírez-Sánchez

Bandala

2018

Catalysts

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Iron-doped TiO2 nanoparticles (Fe-TiO2) were synthesized and photocatalitically investigated under high and low fluence values of UV radiation. The Fe-TiO2 physical characterization was performed using X-ray Powder Diffraction (XRD), Brunauer–Emmett–Teller (BET) surface area analysis, Transmission Electron Microscopy (TEM), Scanning Electron Microscopy (SEM), Diffuse Reflectance Spectroscopy (DRS), and X-ray Photoelectron Spectroscopy (XPS). The XPS evidenced that the ferric ion (Fe3+) was in the TiO2 lattice and unintentionally added co-dopants were also present because of the precursors of the synthetic method. The Fe3+ concentration played a key role in the photocatalytic generation of hydroxyl radicals (•OH) and estriol (E3) degradation. Fe-TiO2 accomplished E3 degradation, and it was found that the catalyst with 0.3 at.% content of Fe (0.3 Fe-TiO2) enhanced the photocatalytic activity under low UV irradiation compared with TiO2 without intentionally added Fe (zero-iron TiO2) and Aeroxide® TiO2 P25. Furthermore, the enhanced photocatalytic activity of 0.3 Fe-TiO2 under low UV irradiation may have applications when radiation intensity must be controlled, as in medical applications, or when strong UV absorbing species are present in water.

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Section: Hydroxyl Radical Generationmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Photocatalytic Degradation of Estriol Using Iron-Doped TiO2 under High and Low UV Irradiation

Ramírez-Sánchez

Bandala

2018

Catalysts

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“…Hydroxyl radicals, which have powerful oxidising properties, are generated during photocatalytic reaction. [40][41][42] P-nitrosodimethylaniline (PNDA) was used as the hydroxyl radicals probe compound. PNDA is selectively oxidized only by hydroxyl radicals, and does not react with superoxide anions and other oxidizing compounds that contribute little to the photocatalytic process.…”

Section: Photocatalytic Test Using Mb and Uvmentioning

confidence: 99%

Formation of Stainless Steel Nanoballs via Submerged Glow-discharge Plasma and their Microstructural Analysis with Evaluation of Photocatalytic Activity

et al. 2018

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Stainless steel has shown potential as a catalytic material in bulk form. However, it only becomes active in an aqueous acidic environment and elevated temperatures. This study aims to produce stainless steel nanoparticles that have high photocatalytic activity in a neutral medium and at room temperature and to elucidate the photocatalytic activity mechanism of the nanoparticles. Spherical, photocatalytic nanoparticles called "nanoballs" were synthesized by the submerged glow-discharge method. Stainless steel SUS316L grade wire was used as the cathode, platinum mesh was used as the anode while the electrolyte was potassium carbonate. The nanoballs were obtained after centrifuging and washing with water. The physical characteristics of the photocatalytic nanoballs were analysed by scanning electron microscopy, high-resolution transmission electron microscopy, energy-dispersive X-ray spectroscopy and X-ray diffraction. The nanoballs were mixed with methylene blue and irradiated with ultraviolet light for the evaluation of photocatalytic reaction. The photodecomposition samples were determined using UV-vis spectrometry. The by-products of the photodecomposition were evaluated using mass spectrometry. The results show that stainless steel nanoballs have photocatalytic activity when irridiated with ultraviolet light at room temperature. Submerged glow-discharge plasma method can synthesize nanoparticles rapidly using only metal wires as the electrode.

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“…Alternatively, we suggest an empirical relationship between the E3 degradation pseudo-first order rate constant (k1) and Fe content (at.%) in TiO2 as described in Eq. (13). Where k1 pseudo-first order constant, ke is electron trap constant, ka electron recombination constant, δ at % doped TiO2, and c and α system constant.…”

Section: Relationship Between Fe Content and Kinetic Constantmentioning

confidence: 99%

“…Advanced Oxidation Process (AOPs) have been reported as a promising technique and, among AOPs, photocatalytic processes using titanium dioxide (TiO2) has been identified as one of the most effective methods to degrade estrogens in water [10]. Several reports recognized TiO2 to degrade estrogens, avoiding increases in estrogenic activity in water [11,12] and able of partially or completely mineralize estrogens [11,13].…”

Section: Introductionmentioning

confidence: 99%

Photocatalytic Degradation of Estriol Using Iron-Doped TiO2 under High and Low UV-Irradiation

Ramírez-Sánchez¹,

Bandala²

2018

Preprint

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Iron Doped TiO2 nanoparticles (Fe-TiO2) were synthesized and photocatalitically investigated under high and low fluence values of UV-radiation. The Fe-TiO2 physical characterization was performed using X-ray Powder Diffraction (XRD), Brunauer-Emmett-Teller (BET) surface area analysis, Transmission Electron Microscope (TEM), Scanning Electron Microscope (SEM), Diffuse Reflectance Spectroscopy (DRS), and X-Ray Photoelectron Spectroscopy (XPS) technique. The XPS evidenced that ferric ion (Fe3+) was in the lattice of TiO2 and co-dopants no intentionally added were also present due to the precursors of the synthetic method. The Fe3+ concentration played a key role in the photocatalytic generation of hydroxyl radical (•OH) and estriol (E3) degradation. Fe-TiO2 materials accomplished E3 degradation, and it was found that the catalyst with 0.3 at. % content of Fe (0.3 Fe-TiO2) enhanced the photocatalytic activity under low UV-irradiation compared with no intentionally Fe-added TiO2 (zero-iron TiO2) and Aeroxide® TiO2 P25. Furthermore, the enhanced photocatalytic activity of 0.3 Fe-TiO2 under low UV-irradiation may have applications when radiation intensity must be controlled, as in medical applications, or when strong UV absorbing species are present in water.

show abstract

Resource efficiency analysis for photocatalytic degradation and mineralization of estriol using TiO2 nanoparticles

Cited by 26 publications

References 68 publications

Photocatalytic Degradation of Estriol Using Iron-Doped TiO2 under High and Low UV Irradiation

Photocatalytic Degradation of Estriol Using Iron-Doped TiO2 under High and Low UV Irradiation

Formation of Stainless Steel Nanoballs via Submerged Glow-discharge Plasma and their Microstructural Analysis with Evaluation of Photocatalytic Activity

Photocatalytic Degradation of Estriol Using Iron-Doped TiO2 under High and Low UV-Irradiation

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