Photocatalytic ozonation using doped TiO2 catalysts for the removal of parabens in water

Gomes, João; Leal, Inês; Bednarczyk, Katarzyna; Gmurek, Marta; Stelmachowski, M.; Diak, Magdalena; Quinta‐Ferreira, Mário; Costa, Raquel; Quinta‐Ferreira, Rosa M.; Martins, Rui C.

doi:10.1016/j.scitotenv.2017.07.180

Cited by 82 publications

(43 citation statements)

References 44 publications

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“…For this, the toxicity assessment over three different species Vibrio fischeri, Corbicula fluminea and Lepidium sativum was performed. The results achieved with the loading of 0.5 wt % onto TiO 2 were obtained from a previous work [22]. The present study allows for understanding that the increase of noble metals load does not necessarily mean an increase in the parabens degradation, TOC and COD removal efficiency.…”

Section: Introductionsupporting

confidence: 68%

“…The photon flux was obtained using ferrioxalate actinometer [22] and was calculated at 5.75 × 10 −7 einstein/Ls. In order to reduce the effect of external sunlight exposure, the photoreactor was covered with aluminum foil, since these photocatalysts are very sunlight sensitive.…”

Section: Methodsmentioning

confidence: 99%

“…Moreover, an increase of Ag loading can increase the photogenerated electron scavenging [21]. The effect of doped TiO 2 at 0.5 wt % loading (Ag, Au, Pd and Pt) and pure TiO 2 was compared on the mixture of parabens degradation using UVA radiation coupled with ozone [22]. Thus, the effect of metal loading onto TiO 2 must be carefully analyzed.…”

Section: Introductionmentioning

confidence: 99%

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Effect of Noble Metals (Ag, Pd, Pt) Loading over the Efficiency of TiO2 during Photocatalytic Ozonation on the Toxicity of Parabens

et al. 2018

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Abstract:The conventional wastewater treatments are inadequate for emerging contaminants detoxification. Photocatalytic ozonation with suitable catalyst can be considered as a suitable solution on the removal of these compounds. The aim of this study was to verify the effect of Ag, Pd and Pt with different loadings (0.1, 0.5 and 1% wt %) onto TiO 2 surface for the degradation of a mixture of parabens (methyl, ethyl, propyl, butyl and benzyl) through photocatalytic ozonation. Chemical oxygen demand (COD) and total organic carbon (TOC) was also analyzed after treatments, as well as the effect of the treatment on the samples toxicity over different species, including bacteria, clams and plants. The effect of metal loading on the parabens degradation; COD and TOC removal is very dependent upon the type of noble metal used. This can be related with the different pathways influenced by the metal load. On the one hand, it can be related with the reduction of electron-hole recombination phenomenon, and, on the other hand, the trapping of electrons by the metals reduces the amount of ozonide and hydroxyl radicals produced. In terms of toxicity, apparently the best results were achieved with the intermediate noble metal load. However, the effect of noble metal load must be analyzed case to case.

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Section: Introductionsupporting

confidence: 68%

Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Effect of Noble Metals (Ag, Pd, Pt) Loading over the Efficiency of TiO2 during Photocatalytic Ozonation on the Toxicity of Parabens

et al. 2018

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“…Morphological and surface characterization of the sample (Pt/TiO2, Pd/TiO 2 and Ag/TiO 2 ) were studied earlier and published in our previous papers [7], [8].…”

Section: A Methodsology For Identifying the Chemical Composition Of Thmentioning

confidence: 99%

An Experimental Study of the Photocatalytic Hydrogen Production in the Laboratory-Scale Set-Up Depending on the Process Conditions

Stelmachowski¹,

Bednarczyk²,

Gmurek³

2017

WIT Transactions on Ecology and the Environment

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Concern for the environment and the use of renewable energy sources are the two main priorities of energy policy combined with an environmental policy that is based on the principles of sustainable development. Many aspects should be taken into account in the case of energy production based on biomass/biofuels, in particular, the possibility of the formation of additional by-products. Glycerol is the main by-product during the trans-esterification of vegetable oils to biodiesel. The photocatalytic hydrogen production from the glycerol-water solution is less energy consuming reaction in comparison (for example) with its steam reforming or bio-conversion because it can be processed under mild conditions and low temperature. The paper presents the experimental results of the application process of photocatalytic hydrogen production from an aqueous solution of glycerol, with the use of TiO2 doped with noble metals (platinum, palladium, silver) as a photocatalyst under solar-like light irradiation. The aim was to compare the hydrogen productivity depending on the catalyst concentration, the kind of the doped metal and the amount of the metal in the catalyst. The reaction (glycerol-water with suspended catalyst) mixture was irradiated by Xe-arc lamps (100 W). The influence of the doped metal on the hydrogen yield was studied for the photocatalysts prepared by the sol-gel and photodeposition method. The photocatalysts have been studied using scanning electron microscopy (SEM) with EDX (Quanta FEI 200F, Oxford Instruments X-Max50), X-ray powder diffraction analysis (XRD) and X-ray photoelectron spectroscopy (XPS). It was proved, that glycerol is a good and efficient substance for the photocatalytic hydrogen production. The prepared and studied photocatalysts are characterized by high stability and very high yield under used process conditions. The experiments were performed in the quartz reactor with volume 1200 cm3. The volume of the reaction solution containing aqueous glycerol solution was 600 cm 3 . The maximum hydrogen production was about 269.13·10-3 [mole H2/(h·gcat)] and it was observed for TiO2 doped by platinum (1% by weight; prepared by photodeposition) for 4.5% aqueous solution of glycerol.

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“…Furthermore, the hydrogen peroxide can be in excess and react with the hydroxyl radicals produced to further production of water Equation (5) or decompose Equation (6). The hydroperoxyl radical produced according to Equation (5) can present a synergetic effect for phenolic acids degradation due to the presence of the saturated bonds such as benzenic rings [33]. However, this radical presents lower oxidant power when compared with the hydroxyl radical.…”

Section: Fenton's Processmentioning

confidence: 99%

Catalytic Efficiency of Red Mud for the Degradation of Olive Mill Wastewater through Heterogeneous Fenton’s Process

Domingues

Assunção

Gomes

et al. 2019

Water

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Olive mill wastewater is a challenging effluent, especially due to its toxicity related to the presence of phenolic compounds. Fenton's process was analysed on the abatement of phenolic acids typically found in this kind of effluents. To overcome the main drawback of Fenton's process, a waste from the aluminium industry commonly called red mud was used as a heterogeneous source of iron. The adsorption of simulated effluent on the red mud was negligible. Therefore, the degradation of phenolic acids during Fenton's process was due to oxidation by hydroxyl radicals. The amount of red mud and hydrogen peroxide were optimized regarding phenolic acids degradation. The optimal conditions leading to the highest removal of contaminants (100% of phenolic acids degradation and 25% of mineralization after 60 min of reaction) were 1 g/L of catalyst and 100 mg/L of hydrogen peroxide. The possibility of recovering treated water for agricultural purposes was evaluated by assessing the toxic impact over a wide range of species. The toxicity observed for the treated samples was mainly related to the residual hydrogen peroxide remaining after treatment.

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Photocatalytic ozonation using doped TiO2 catalysts for the removal of parabens in water

Cited by 82 publications

References 44 publications

Effect of Noble Metals (Ag, Pd, Pt) Loading over the Efficiency of TiO2 during Photocatalytic Ozonation on the Toxicity of Parabens

Effect of Noble Metals (Ag, Pd, Pt) Loading over the Efficiency of TiO2 during Photocatalytic Ozonation on the Toxicity of Parabens

An Experimental Study of the Photocatalytic Hydrogen Production in the Laboratory-Scale Set-Up Depending on the Process Conditions

Catalytic Efficiency of Red Mud for the Degradation of Olive Mill Wastewater through Heterogeneous Fenton’s Process

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