Solar treatment (H2O2, TiO2-P25 and GO-TiO2 photocatalysis, photo-Fenton) of organic micropollutants, human pathogen indicators, antibiotic resistant bacteria and related genes in urban wastewater

Moreira, Nuno F.F.; Narciso-da-Rocha, Carlos; Polo-López, María Inmaculada; Pastrana‐Martínez, Luisa M.; Faria, Joaquim L.; Manaia, Célia M.; Fernández‐Ibáñez, Pilar; Nunes, Olga C.; Silva, Adrián M.T.

doi:10.1016/j.watres.2018.01.064

Cited by 216 publications

(69 citation statements)

References 75 publications

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“…Several studies have been published using different approaches to develop photocatalysts that can address the above shortcoming [7], by creating defect structures on the catalyst [128], by metal deposition on the catalyst surface [129], by semiconductor coupling of the energy bands [130] and by doping with metals/non-metal ions [131]. TiO2 combinations with noble metals (e.g., silver, gold and platinum) [63] or with carbon-based materials such as graphene-based materials [132,133], have also been examined. Other carbon materials have been widely studied, including activated carbons [134,135], carbon xerogels [136], carbon nanotubes [137,138], graphite [139], and more recently graphitic carbon nitride [140].…”

Section: Photocatalysismentioning

confidence: 99%

Impact of water matrix on the removal of micropollutants by advanced oxidation technologies

Ribeiro

Moreira

Puma

et al. 2019

Chemical Engineering Journal

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429

110

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Micropollutants (MPs) in the aquatic compartments originate from many sources and particularly from the effluents of urban wastewater treatment plants (UWWTPs). Advanced oxidation technologies (AOTs) usually applied after biological processes, have recently emerged as effective tertiary treatments for the removal of MPs, but the oxidation rates of the single compounds may be largely affected by the constituent species of the water matrix. These species include dissolved organic matter and inorganic species (e.g., carbonate, bicarbonate, nitrite, sulphate, chloride). This review analyses the impact of such substances on common AOTs including photolysis, UV/H2O2, Fenton, photocatalysis, and ozone-based processes. The degradation efficiency of single MPs by AOTs results from the combined impact of the water matrix constituents, which can have neutral, inhibiting or promoting effect, depending on the process and the mechanism by which these water components react. Organic species can be either inhibitors (by light attenuation; scavenging effects; or adsorption to catalyst) or promoters (by originating reactive oxygen species (ROS) which enhance indirect photolysis; or by regenerating the catalyst). Inorganic species can also be either inhibitors (by scavenging effects; formation of radicals less active than hydroxyl radicals; iron complexation; adsorption to catalyst or decrease 2 of its effective surface area) or promoters (e.g., nitrate ions by formation of ROS; iron ions as additional source of catalyst). The available data reviewed here is limited and the role and mechanisms of individual water components are still not completely understood. Further studies are needed to elucidate the wide spectrum of reactions occurring in complex wastewaters and to increase the adoption of AOTs in UWWTPs.

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Section: Photocatalysismentioning

confidence: 99%

Impact of water matrix on the removal of micropollutants by advanced oxidation technologies

Ribeiro

Moreira

Puma

et al. 2019

Chemical Engineering Journal

Self Cite

429

110

View full text Add to dashboard Cite

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“…Additionally, a theoretical case study is performed to use the model to design a translucent monolith for the degradation of pharmaceutical micropollutants during wastewater treatment. It is well known in literature that TiO 2 in combination with light can be used to degrade micropollutants . In this case study an optimal monolith is simulated, providing guidelines to design a translucent monolith for wastewater treatment.…”

Section: Introductionmentioning

confidence: 99%

First generation of translucent monoliths for photochemical applications

Jacobs

Kayahan

Thomassen

et al. 2020

J Adv Manuf & Process

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Monolith structures are a common method to scale flow chemistry tools up to industrial throughput. Internally illuminated monolith reactors (IIMRs) were their versions for photochemistry. The channels inside the monolith were illuminated with optical fibers coated with a photocatalyst such as TiO 2 . The majority of the light in an IIMR was however not utilized to illuminate the reaction medium. Furthermore, the monolith was always made of opaque materials, making it impossible for unabsorbed light to illuminate other channels, lowering the photochemical space-time yield (PSTY), a benchmark for the overall energy efficiency of a photoreactor. In this paper, the potential of a translucent monolith structure for scalable photochemical process design was tested. Due to the translucent nature of the monolith, there was no need for optical fibers or multiple light sources to provide the necessary photon flux and distribution. There has never been a study of translucent monoliths in the open literature and no design parameters have been investigated. This research studies the first translucent monoliths and their design principles by varying the channel size, channel distance as well as the amount of unit cells with a ray tracing algorithm in COMSOL Multiphysics. A model was developed, validated and used to design a monolith for the photodegradation of micropollutants in a case study. A theoretical improvement of seven orders of magnitude in PSTY was obtained compared to IIMRs making this reactor design a promising candidate for more efficient photochemical processes. K E Y W O R D Sadditive manufacturing, COMSOL multiphysics, modeling and simulation, process intensification, ray tracing, translucent monolith

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“…Over the last decade, scientific research interest for developing such a photocatalyst has been growing exponentially [6,[15][16][17][18][19]. Among the reported photocatalysts, TiO 2 -based photocatalysts seem to be more popular because of their chemical stability, strong oxidizing power, nontoxicity, and low cost [20][21][22]. However, there are still some drawbacks that need to be addressed for this type of photocatalyst.…”

Section: Introductionmentioning

confidence: 99%

A C-Doped TiO2/Fe3O4 Nanocomposite for Photocatalytic Dye Degradation under Natural Sunlight Irradiation

et al. 2019

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Magnetically recyclable C-doped TiO2/Fe3O4 (C-TiO2/Fe3O4) nanocomposite was successfully synthesized via a sol–gel method. The synthesized samples were characterized using SEM, energy-dispersive X-ray spectroscopy (EDS), FTIR, and UV-VIS diffuse reflectance spectroscopy (DRS) techniques. The results clearly showed that a C-TiO2/Fe3O4 nanocomposite was produced. The photocatalytic activities of the prepared pristine (TiO2), C-doped TiO2 (C-TiO2) and C-TiO2/Fe3O4 were evaluated by the photodegradation of methyl orange (MO) under natural sunlight. The effect of catalyst loading and MO concentration were studied and optimized. The C-TiO2/Fe3O4 nanocomposite exhibited an excellent photocatalytic activity (99.68%) that was higher than the TiO2 (55.41%) and C-TiO2 (70%) photocatalysts within 150 min. The magnetic nanocomposite could be easily recovered from the treated solution by applying external magnetic field. The C-TiO2/Fe3O4 composite showed excellent photocatalytic performance for four consecutive photocatalytic reactions. Thus, this work could provide a simple method for the mass production of highly photoactive and stable C-TiO2/Fe3O4 photocatalyst for environmental remediation.

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Solar treatment (H2O2, TiO2-P25 and GO-TiO2 photocatalysis, photo-Fenton) of organic micropollutants, human pathogen indicators, antibiotic resistant bacteria and related genes in urban wastewater

Cited by 216 publications

References 75 publications

Impact of water matrix on the removal of micropollutants by advanced oxidation technologies

Impact of water matrix on the removal of micropollutants by advanced oxidation technologies

First generation of translucent monoliths for photochemical applications

A C-Doped TiO2/Fe3O4 Nanocomposite for Photocatalytic Dye Degradation under Natural Sunlight Irradiation

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