Micro-TiO2 coated glass surfaces safely abate drugs in surface water

Cerrato, G.; Bianchi, Claudia L.; Galli, F.; Pirola, Carlo; Morandi, Sara; Capucci, V.

doi:10.1016/j.jhazmat.2018.09.057

Cited by 24 publications

(13 citation statements)

References 34 publications

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“…TiO 2 is one the most employed semiconductors. It has found applications in water and air purification [16][17][18], sterilization [19], self-cleaning building materials [20], defogging [21], and H 2 generation from water splitting [22]. TiO 2 is cheaper and more photo-chemically and chemically stable than other semiconductors [13].…”

Section: Introductionmentioning

confidence: 99%

The Sonophotocatalytic Degradation of Pharmaceuticals in Water by MnOx-TiO2 Systems with Tuned Band-Gaps

et al. 2019

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Advanced oxidation processes (AOPs) are technologies to degrade organic pollutants to carbon dioxide and water with an eco-friendly approach to form reactive hydroxyl radicals. Photocatalysis is an AOP whereby TiO2 is the most adopted photocatalyst. However, TiO2 features a wide (3.2 eV) and fast electron-hole recombination. When Mn is embedded in TiO2, it shifts the absorption wavelength towards the visible region of light, making it active for natural light applications. We present a systematic study of how the textural and optical properties of Mn-doped TiO2 vary with ultrasound applied during synthesis. We varied ultrasound power, pulse length, and power density (by changing the amount of solvent). Ultrasound produced mesoporous MnOx-TiO2 powders with a higher surface area (101–158 m2 g−1), pore volume (0-13–0.29 cc g−1), and smaller particle size (4–10 µm) than those obtained with a conventional sol-gel method (48–129 m2 g−1, 0.14–0.21 cc g−1, 181 µm, respectively). Surprisingly, the catalysts obtained with ultrasound had a content of brookite that was at least 28%, while the traditional sol-gel samples only had 7%. The samples synthesized with ultrasound had a wider distribution of the band-gaps, in the 1.6–1.91 eV range, while traditional ones ranged from 1.72 eV to 1.8 eV. We tested activity in the sonophotocatalytic degradation of two model pollutants (amoxicillin and acetaminophen). The catalysts synthesized with ultrasound were up to 50% more active than the traditional samples.

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Section: Introductionmentioning

confidence: 99%

The Sonophotocatalytic Degradation of Pharmaceuticals in Water by MnOx-TiO2 Systems with Tuned Band-Gaps

et al. 2019

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“…However, this type of reactor design is prone to photocatalyst deactivation due to the limited irradiated surface area [45]. In this respect, immobilization of the photocatalyst on substrates such as Rashig rings [50] can promote the overall photocatalyst surface area and mass transfer due to turbulent flow conditions within the reactor. Other concerns regard filming problems at the glazing/lamp surface due to accumulation of dirt from wastewater, and the need of air or oxygen purging to maintain aeration in the closed reactor.…”

Section: Figurementioning

confidence: 99%

Towards Scaling-up Photocatalytic Process for Multiphase Environmental Applications: A Review

Mg¹,

Djellabi²,

Meroni³

et al. 2021

Preprint

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Recently, we have witnessed a booming development of composites and multi-dopant metal oxides to be employed as novel photocatalysts. Yet the practical application of photocatalysis for environmental purposes is still elusive. Concerns about the unknown fate and toxicity of nanoparticles, unsatisfactory performance in real conditions, mass transfer limitations and durability issues have so far discouraged investments in full-scale applications of photocatalysis. Herein, we provide a critical overview of the main challenges that are limiting large-scale application of photocatalysis in air and water/wastewater purification. We then discuss the main approaches reported in the literature to tackle these shortcomings, such as the design of photocatalytic reactors that retain the photocatalyst, the study of degradation of micropollutants in different water matrices, and the development of gas-phase reactors with optimized contact time and irradiation. Furthermore, we provide a critical analysis of research-practice gaps such as treatment of real water and air samples, degradation of pollutants with actual environmental concentrations, photocatalyst deactivation, and cost and environmental life-cycle assessment.

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“…Recent studies support the low-efficiency for immobilized catalysts, which is associated with a decrease in the surface area exposed to the solution. For example, Cerrato et al 76 studied the immobilization of TiO 2 on glass materials for the degradation of Ibuprofen under UV-C radiation, finding that the application in suspension allows to achieve the best results for the degradation of the studied drug.…”

Section: Photocatalytic Activity and Mechanismmentioning

confidence: 99%

“…The results showed values lower than 5% and 10% for the photolysis and dark adsorption tests, respectively, which correspond to commonly published in research related to targets of molecular adsorption and photolysis of organic compounds, such as pesticides, dyes, and pharmaceuticals, among others. 55,76,77 h…”

Section: Photocatalytic Activity and Mechanismmentioning

confidence: 99%

Cypermethrin elimination using Fe-TiO₂ nanoparticles supported on coconut palm spathe in a solar flat plate photoreactor

Solano

Herrera

2020

Advanced Composites Letters

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In this research, the photocatalytic degradation of cypermethrin using iron-titanium dioxide (Fe-TiO2) nanoparticles supported in a biomaterial was evaluated. The nanoparticles of TiO2 were synthesized by the green chemistry method assisted by ultrasound and doped by chemical impregnation using Fe+3:Ti molar ratios of 0, 0.05, 0.075 and 0.1 to make efficient use of direct sunlight ( λ > 310 nm). All nanoparticles were immobilized on the surface of coconut spathe ( Cocos nucifera). The degradation was carried out at room temperature and natural pH in a flat plate solar reactor, on which the composite material was subjected. The concentration of cypermethrin was determined after 12,000 J m−2 of accumulated radiation from gas chromatography–mass spectrometry and the resulting material was characterized by scanning electron microscopy, transmission electron microscopy, X-ray diffraction, Fourier-transform infrared spectroscopy, ultraviolet–visible diffuse reflectance spectroscopy, and Brunauer-Emmett-Teller (BET) surface area. The best results were achieved with the use of Evonik TiO2 P-25, Fe:Ti = 0 and Fe:Ti = 0.05 in suspension, with percentages of degradation of cypermethrin of 99.84%, 99.62%, and 100%, respectively. However, the materials supported on the biomaterial of coconut allowed to reach degradation percentages higher than 80%, with the advantage that it minimizes operating costs, as they are not necessarily filtering or centrifuging processes to separate the catalyst.

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Micro-TiO2 coated glass surfaces safely abate drugs in surface water

Cited by 24 publications

References 34 publications

The Sonophotocatalytic Degradation of Pharmaceuticals in Water by MnOx-TiO2 Systems with Tuned Band-Gaps

The Sonophotocatalytic Degradation of Pharmaceuticals in Water by MnOx-TiO2 Systems with Tuned Band-Gaps

Towards Scaling-up Photocatalytic Process for Multiphase Environmental Applications: A Review

Cypermethrin elimination using Fe-TiO₂ nanoparticles supported on coconut palm spathe in a solar flat plate photoreactor

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Micro-TiO2 coated glass surfaces safely abate drugs in surface water

Cited by 24 publications

References 34 publications

The Sonophotocatalytic Degradation of Pharmaceuticals in Water by MnOx-TiO2 Systems with Tuned Band-Gaps

The Sonophotocatalytic Degradation of Pharmaceuticals in Water by MnOx-TiO2 Systems with Tuned Band-Gaps

Towards Scaling-up Photocatalytic Process for Multiphase Environmental Applications: A Review

Cypermethrin elimination using Fe-TiO2 nanoparticles supported on coconut palm spathe in a solar flat plate photoreactor

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Product

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Cypermethrin elimination using Fe-TiO₂ nanoparticles supported on coconut palm spathe in a solar flat plate photoreactor