TiO2 thick films supported on stainless steel foams and their photoactivity in the nonylphenol ethoxylate mineralization

Silva, Salatiel Wohlmuth da; Bortolozzi, Juan Pablo; Banús, Ezequiel David; Bernardes, Andréa Moura; Ulla, Maria Alicia del H.

doi:10.1016/j.cej.2015.08.057

Cited by 29 publications

(15 citation statements)

References 60 publications

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“…Many studies in the literature use TiO 2 P25 (Degussa) (Chong et al 2010;Li et al 2013;Jonidi-Jafari et al 2015;Ma et al 2015) since, besides having these advantages, it presents a surface area of 50 m 2 g −1 and the percentages of anatase and rutile phases are 75 and 25 %, respectively, which favors its high performance in photocatalytic reactions (Silva et al 2016). Therefore, in this study, TiO 2 P25, Degussa, was used in photocatalytic reactions.…”

Section: Introductionmentioning

confidence: 98%

“…The semiconductor most commonly used in photocatalytic processes is TiO 2 , since it has high efficiency, chemical and thermal stability, nontoxicity, and relatively low cost (Chong et al 2010;Li et al 2013;Ma et al 2015;Silva et al 2016). Many studies in the literature use TiO 2 P25 (Degussa) (Chong et al 2010;Li et al 2013;Jonidi-Jafari et al 2015;Ma et al 2015) since, besides having these advantages, it presents a surface area of 50 m 2 g −1 and the percentages of anatase and rutile phases are 75 and 25 %, respectively, which favors its high performance in photocatalytic reactions (Silva et al 2016).…”

Section: Introductionmentioning

confidence: 99%

“…Advanced oxidation processes (AOPs) have been widely studied for the degradation of persistent organic contaminants present in water (Pereira et al 2012;Li et al 2013;Tisa et al 2014;Wang et al 2014;Silva et al 2016). This technology is characterized by the generation of the hydroxyl radical (HO • ), which has a high standard reduction potential (E 0 = 2.8 V), and therefore, it is able to oxidize organic contaminants to their mineralization (Marmitt et al 2010;Wang et al 2014).…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Degradation of organic contaminants in effluents—synthetic and from the textile industry—by Fenton, photocatalysis, and H2O2 photolysis

Lima

Pereira

Moura

et al. 2016

Environ Sci Pollut Res

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In this study, the oxidation of the dye rhodamine B (RhB), present in a synthetic effluent, and the degradation of organic matter present in a textile effluent, were assessed by photolysis (HO, UV), homogeneous Fenton (Fe, HO), and photocatalysis (TiO, UV). The results showed that photolysis and Fenton had an efficiency of 100 % and photocatalysis, 96 %, to discoloration 10 mg L RhB, present in the synthetic effluent. The best experimental conditions determined for these reactions showed that the one performed with 51 mg L HO and UV light had the best results, where 100 % of RhB was discolored in only 6 min of reaction. The optimum conditions determined in the first part of this study for the RhB oxidation did not show satisfactory results for the degradation of organic matter present in the textile effluent sample, and it was necessary to increase the amount of reagents in the three processes. After resizing the concentration of the reagents for the reactions with the textile effluent, the following reductions of color, total organic carbon (TOC), and total soluble solids (SS) were obtained: photocatalysis 29, 25, and 32 %; photolysis 85, 69, and 35 %; Fenton 98, 90, and 23 %; and biological (followed by physicochemical) treatment carried out by the textile industry 96, 48, and 9 %. It is observed that the Fenton reaction showed the best result, followed by photolysis reaction, a treatment carried out by industry and, at last, photocatalysis.

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Section: Introductionmentioning

confidence: 98%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Degradation of organic contaminants in effluents—synthetic and from the textile industry—by Fenton, photocatalysis, and H2O2 photolysis

Lima

Pereira

Moura

et al. 2016

Environ Sci Pollut Res

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“…[9] The use of highly porous inorganic foams as supports for photocatalytic nanoparticles has been an attempt to address these twin issues. [10] Foams are 3D macroporous materials with defined porosity, [11] whose properties, e.g., pore size, shape, and permeability, [12] can be controlled during their synthesis. [13] Alumina foams have been used as a support for grafting of titania (TiO 2 ) nanoparticles, showing higher photocatalytic efficiency than TiO 2 slurries in a pilot-scale photocatalytic oxidation reactor under UV irradiation.…”

mentioning

confidence: 99%

Photocatalytic ZnO Foams for Micropollutant Degradation

Guaraldo

Wenk

Mattia

2021

Advanced Sustainable Systems

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due to seasonal changes, water types, and wastewater treatment plant (WWTP) configurations. [4] This is a global problem, with widespread presence of micropollutants in both influent and effluent from WWTPs in Asia, North America, and Europe. [4,5] However, conventional wastewater treatment plants both in urban and industrial areas are unable to effectively remove organic micropollutants. [5] Tertiary treatment for the removal of micropollutants, including advanced oxidation processes (AOPs), has been implemented in some countries, but remains expensive and energy intensive. [6] Among potential AOPs, photo catalysis has been shown to be effective at degrading pesticides, hormones, pharmaceuticals, and endocrine disruptors. [7] However, its implementation has, so far, been hampered by cost and safety concerns associated with the use of slurries on one hand, [7,8] and the low activity of immobilized photocatalyst configurations on the other. [9] The use of highly porous inorganic foams as supports for photocatalytic nanoparticles has been an attempt to address these twin issues. [10] Foams are 3D macroporous materials with defined porosity, [11] whose properties, e.g., pore size, shape, and permeability, [12] can be controlled during their synthesis. [13] Alumina foams have been used as a support for grafting of titania (TiO 2 ) nanoparticles, showing higher photocatalytic efficiency than TiO 2 slurries in a pilot-scale photocatalytic oxidation reactor under UV irradiation. [12] The photocatalytic removal of the herbicide paraquat was performed using TiO 2 / SiC foams, with TOC removal of 90% achieved in a flow reactor under UV irradiation. [14] A TiO 2 foam, prepared using a polymeric sacrificial layer, was used for the degradation of several organic pollutants including hexadecane, phenol, atrazine, RhB, and thiobencarb, under visible light irradiation, showing better removal performance than a slurry using P25 TiO 2 nanoparticles, with high stability and mineralization degree. [15] Complete mineralization of phenol was achieved using TiO 2 nanoparticles grafted onto Al 2 O 3 foams, with higher photocatalytic activity than the corresponding powder dispersion. [16] Further improvements in photocatalytic performance have been achieved by increasing the loading of TiO 2 nanoparticles onto the foam supports. [17] Regardless of their presence, as slurries or supported, the practical impossibility of ensuring that there is no leaching of nanoparticles from WWTPs, has induced the EU and other regulators to restrict their use in water treatment. [18] A potential alternative, proposed here, is to create foams that are inherently photocatalytic, i.e., made of a material that is photoactive, Photocatalytic foams can concomitantly overcome the disadvantages of slurry and immobilized photocatalysts in water treatment. However, foams have, so far, been restricted to nanoparticles grafting onto inert foam substrates, with the consequent risk of nanoparticle release into the environment. In this work, self-supporting, highly por...

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“…[1][2][3] Adsorbent compounds incorporated in TiO 2 increase the photocatalytic activity by collecting pollutants onto the surface of the photocatalyst from the solution. Currently most of the studies are focused on the immobilization of TiO 2 on supports, including NiO, 4) polymers, 5) stainless steel, 6) reduced graphene oxide, 7) zeolites, 8) etc. Among the above materials, zeolites are considered to be important TiO 2 supports, owing to their large surface area, high thermal stability and eco-friendly nature.…”

Section: Introductionmentioning

confidence: 99%

Hydrochloric Acid Treatment: An Effective Method to Enhance the Catalytic Performance of TiO<sub>2</sub> Stellerite Composite Photocatalyst on Methyl Orange

et al. 2016

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Stellerite (a natural zeolite) was used as substrate for titanium dioxide deposition. Stellerite was treated at 363 K with hydrochloric acid solutions of different concentrations (0.2-1.0 mol L −1 ) for 4 hours. The resulting composite samples were characterized by scanning electron microscopy (SEM), energy dispersive X-ray (EDX), Fourier transform infrared spectroscopy (FT-IR), BET surface area analysis and X-ray diffraction (XRD). The hydrochloric acid treatment caused the creation of micropores with 1 nm diameter. The result illustrates that stellerite possesses strongly acid-resistant property in hydrochloric acid solutions with a concentration no higher than 0.4 mol L . The recycling of the TiO 2 /stellerite photocatalyst was also investigated, and the methyl orange degradation rate was 75.0% of the initial rate after four cycles.

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TiO2 thick films supported on stainless steel foams and their photoactivity in the nonylphenol ethoxylate mineralization

Cited by 29 publications

References 60 publications

Degradation of organic contaminants in effluents—synthetic and from the textile industry—by Fenton, photocatalysis, and H2O2 photolysis

Degradation of organic contaminants in effluents—synthetic and from the textile industry—by Fenton, photocatalysis, and H2O2 photolysis

Photocatalytic ZnO Foams for Micropollutant Degradation

Hydrochloric Acid Treatment: An Effective Method to Enhance the Catalytic Performance of TiO<sub>2</sub> Stellerite Composite Photocatalyst on Methyl Orange

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