Photoelectrocatalytic degradation of 17α-ethinylestradiol and estrone under UV and visible light using nanotubular oxide arrays grown on Ti-0.5wt%W

Oliveira, Marizilda Escudeiro de; Barroso, Bruno Lupi; Almeida, Juliana de; Moraes, Maria de Lourdes Leite de; Rodrigues, Christiane de Arruda

doi:10.1016/j.envres.2020.110044

Cited by 29 publications

(5 citation statements)

References 41 publications

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“…In contrast, the combination of filtration and photocatalysis considerably increased the 17α-ethinylestradiol removal from the aqueous medium, showing that the membrane coating with TiO 2 nanoparticles effectively reduces the hormone concentration by degrading this compound ( Figure 10 B). The products of degradations of 17α-ethinylestradiol by UV radiation have been proposed in the literature [ 56 ]. It is important to note that UV-Vis was also used to monitor the solution to check for any release of colored substances into the solution, which did not occur, suggesting that the coating applied provides both photocatalytic activity and membrane protection from UV exposure during the experimental time tested.…”

Section: Resultsmentioning

confidence: 99%

Stability of Polymeric Membranes to UV Exposure before and after Coating with TiO2 Nanoparticles

et al. 2021

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The combination of photocatalysis and membrane filtration in a single reactor has been proposed, since the photocatalytic treatment may degrade the pollutants retained by the membrane and reduce fouling. However, polymeric membranes can be susceptible to degradation by UV radiation and free radicals. In the present study, five commercial polymeric membranes were exposed to ultraviolet (UV) radiation before and after applying a sol–gel coating with TiO2 nanoparticles. Membrane stability was characterized by changes in hydrophilicity as well as analysis of soluble substances and nanoparticles detached into the aqueous medium, and by Fourier transform infrared spectroscopy (FTIR), scanning electron microscope (SEM), and energy-dispersive X-ray spectrometry (EDS) for structural, morphological, and elemental distribution analysis, respectively. The TiO2 coating conferred photocatalytic properties to the membranes and protected them during 6 h of UV radiation exposures, reducing or eliminating chemical and morphological changes, and in some cases, improving their mechanical resistance. A selected commercial nanofiltration membrane was coated with TiO2 and used in a hybrid reactor with a low-pressure UV lamp, promoting photocatalysis coupled with cross-flow filtration in order to remove 17α-ethinylestradiol spiked into an aqueous matrix, achieving an efficiency close to 100% after 180 min of combined filtration and photocatalysis, and almost 80% after 90 min.

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Section: Resultsmentioning

confidence: 99%

Stability of Polymeric Membranes to UV Exposure before and after Coating with TiO2 Nanoparticles

et al. 2021

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“…The degradation of E1 and its transformation to a new product was explained by Escudeiro Oliveira et al [14]. There are two major steps in the degradation routes in a hydroxyl radical-containing medium of E1.…”

Section: 2) Surface Morphology Propertiesmentioning

confidence: 99%

“…PMR combines photocatalysis and membrane filtration, offering a comprehensive approach to water and wastewater treatment, especially with micropollutant removal. Furthermore, numerous studies have utilized titanium dioxide (TiO2) as a catalyst due to its high photocatalytic activity when exposed to UV irradiation, which generates hydroxyl radicals capable of breaking down pollutants into smaller, less toxic compounds [14][15][16]. TiO2 is valued for its stability, cost-effectiveness, and eco-friendly properties [17] making it a promising candidate for addressing micropollutants in wastewater treatment processes.…”

Section: Introductionmentioning

confidence: 99%

Monitoring of Estrone from Hospital Wastewater and its Removal by Photocatalytic Membrane Reactor

Karnjanamit,

Thammakhet-Buranachai,

Jutaporn

et al. 2024

App. Envi. Res.

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Steroid hormones, classified as endocrine-disrupting compounds (EDCs), pose significant environmental and health concerns due to their persistence and potential adverse effects. This study investigates the presence of estrone (E1) in hospital wastewater and the efficiency of E1 removal through a photocatalytic membrane reactor (PMR). Wastewater samples were collected from two hospitals with different wastewater treatment processes. The concentration of E1 was analyzed using a combination of solid phase extraction (SPE) and liquid chromatography-tandem mass spectrometry (LC-MS/MS). The PMR experimental setup involved a polyvinylidene fluoride (PVDF) membrane incorporated with 1 wt% titanium dioxide (PVDF/TiO2). The PMR performance was evaluated with and without UVC radiation. The membranes were characterized for their water contact angle (WCA) and surface morphology. The maximum concentration of E1 in the hospital wastewater was 2.46 ± 1.90 ng L-1. The PMR, operated for 180 min, demonstrated that PVDF/TiO2 (UV) exhibited the highest E1 removal efficiency (96.7 ± 1.4%). This superior performance was attributed to the synergistic effect of PVDF/TiO2 membrane filtration combined with UV irradiation, enhancing the removal capacity. The removal of E1 in the PVDF/TiO2 membrane (36.5 ± 2.7%) surpassed that of the PVDF membrane (32.6 ± 7.8%). The kinetics analysis indicated that the degradation of E1 followed pseudo first-order kinetics. These findings underscore the potential of PMR technology, specifically employing PVDF/TiO2 membranes with UV irradiation, for efficient removal of E1 from hospital wastewater, offering insights for future applications in mitigating micropollutant release into the environment.

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“…Based on their results, the doped samples presented enhanced photocatalytic activity in comparison to samples without doping, as well as other semiconductors, when subjected to both types of light irradiation. This superiority was attributed to reduced recombination rates of photo-produced charges and a flat-band potential's shift towards more negative values [221].…”

Section: Tio2-based Photocatalysts For Effective Elimination Of Pharm...mentioning

confidence: 99%

Photocatalytic TiO2-Based Nanostructures as a Promising Material for Diverse Environmental Applications: A Review

Gatou,

Syrrakou,

Lagopati

et al. 2024

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Contemporary technological and industrial advancements have led to increased reliance on chemicals for product innovation, leading to heightened contamination of water sources by traditional pollutants (organic dyes, heavy metals) and disease-causing microorganisms. Wastewater treatment processes now reveal “emerging pollutants”, including pharmaceuticals, endocrine disruptors, and agricultural chemicals. While some are benign, certain emerging pollutants can harm diverse organisms. Researchers seek cost-effective water purification methods that completely degrade pollutants without generating harmful by-products. Semiconductor-based photocatalytic degradation, particularly using titanium dioxide (TiO2), is popular for addressing water pollution. This study focuses on recent applications of TiO2 nanostructures in photocatalysis for eliminating various water pollutants. Structural modifications, like doping and nanocomposite formation, enhance photocatalyst performance. The study emphasizes photocatalytic elimination mechanisms and comprehensively discusses factors impacting both the mechanism and performance of nano-TiO2-based photocatalysts. Characteristics of TiO2, such as crystal structure and energy band-gap, along with its photocatalytic activity mechanism, are presented. The review covers the advantages and limitations of different TiO2 nanostructure production approaches and addresses potential toxicity to human health and the environment. In summary, this review provides a holistic perspective on applying nano-TiO2 materials to mitigate water pollution.

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Photoelectrocatalytic degradation of 17α-ethinylestradiol and estrone under UV and visible light using nanotubular oxide arrays grown on Ti-0.5wt%W

Cited by 29 publications

References 41 publications

Stability of Polymeric Membranes to UV Exposure before and after Coating with TiO2 Nanoparticles

Stability of Polymeric Membranes to UV Exposure before and after Coating with TiO2 Nanoparticles

Monitoring of Estrone from Hospital Wastewater and its Removal by Photocatalytic Membrane Reactor

Photocatalytic TiO2-Based Nanostructures as a Promising Material for Diverse Environmental Applications: A Review

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