Detoxification of parabens using UV-A enhanced by noble metals—TiO2 supported catalysts

Gomes, João; Leal, Inês; Bednarczyk, Katarzyna; Gmurek, Marta; Stelmachowski, M.; Zaleska-Medynska, Adriana; Quinta‐Ferreira, Mário; Costa, Raquel; Quinta‐Ferreira, Rosa M.; Martins, Rui C.

doi:10.1016/j.jece.2017.06.010

Cited by 55 publications

(60 citation statements)

References 39 publications

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“…However, rutile and brookite were also identified in a smaller amount. The diffractogram of pure TiO 2 was presented in a previous study [29]. The presence of the doping metals on TiO 2 does not change the XRD pattern, independently of the loading of noble metals considered.…”

Section: Catalysts Characterizationmentioning

confidence: 81%

“…The effect of different noble metals loads on parabens degradation was analysed as a function of TOD. The UVA radiation is not able to effectively degrade parabens, and just 3% of removal was achieved [29]. On the other hand, for ozone alone, total parabens degradation needed an increase on TOD of 3-fold compared with photocatalytic ozonation.…”

Section: Effect Of Noble Metal Loading On the Parabens Degradationmentioning

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: Catalysts Characterizationmentioning

confidence: 81%

Section: Effect Of Noble Metal Loading On the Parabens Degradationmentioning

confidence: 99%

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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“…Some studies with TiO 2 modified with noble metals have already been conducted. Photocatalytic oxidation with pure and TiO 2 modified with Ag, Au, Pd, and Pt for parabens mixture under UV-A [25], as well as natural sunlight [26], proved that the catalysis enhances the elimination of these compounds as compared with direct photolysis. Improved elimination efficiency was also reported with respect to trimethoprim in the process with Au, Ag, Cu, and Ni nanoparticles deposited on the TiO 2 surface [27].…”

Section: Of 19mentioning

confidence: 98%

Solar Photocatalytic Degradation of Sulfamethoxazole by TiO2 Modified with Noble Metals

et al. 2019

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Application of solar photocatalysis for water treatment is intensively studied. In this work, we investigated TiO2 modified with platinum (Pt/TiO2) and palladium (Pd/TiO2) using sulfamethoxazole (SMX) as the model contaminant. We considered the following parameters: (i) level of TiO2 modification with Pt/Pd, (ii) initial concentration of photocatalysts, (iii) geographic location where processes were conducted, and (iv) natural water matrix. The catalysts characterized by SEM, EDX, DRS, and XRD techniques showed successful deposition of Pd and Pt atoms on TiO2 surface that enabled light absorption in the visible (Vis) range, and therefore caused efficient SMX removal in all tested conditions. A comparison of the rate constants of SMX degradation in various conditions revealed that modification with Pd gave better results than modification with Pt, which was explained by the better optical properties of Pd/TiO2. The removal of SMX was higher with Pd/TiO2 than with Pt/TiO2, independent of the modification level. In the experiments with the same modification level, similar rate constants were achieved when four times the lower concentration of Pd/TiO2 was used as compared with Pt/TiO2. Formation of four SMX transformation products was confirmed, in which both amine groups are involved in photocatalytic oxidation. No toxic effect of post-reaction solutions towards Lepidium sativum was observed.

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“…Single and catalytic ozonation were carried out in a 2 L glass reactor with a thermostatic water-bath to maintain the temperature (25 ± 1 • C) and continuous stirring using a magnetic stirrer at 700 rpm [33,34]. Moreover, when a solid catalyst was used, the size of particles used was lower than 105 µm.…”

Section: Experimental Procedures For Single and Catalytic Ozonationmentioning

confidence: 99%

Removal of Enteric Pathogens from Real Wastewater Using Single and Catalytic Ozonation

Gomes

Frasson

Quinta‐Ferreira

et al. 2019

Water

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Water scarcity is one of the main problems of this century. Water reclamation appears as an alternative due to the reuse of treated wastewater. Therefore, effluents treatment technologies (activated sludge, rotary biological discs, percolating beds) must be improved since they are not able to remove emerging contaminants such as enteric pathogens (bacteria and virus). These pollutants are difficult to remove from the wastewater and lead to adverse consequences to human health. Advanced oxidation processes, such as single and catalytic ozonation, appear as suitable complements to conventional processes. Catalytic ozonation was carried out using a low-cost material, a volcanic rock. Single and catalytic ozonation were capable of promoting total Escherichia coli removal from municipal wastewater after 90 min of contact. The presence of volcanic rock increases disinfection efficiency since E. coli regrowth was not observed. The identified viruses (Norovirus genotype I and II and JC virus) were completely removed using catalytic ozonation, whereas single ozonation was not able to eliminate JC virus even after 150 min of treatment. The higher performance of the catalytic process can be explained by the formation of hydroxyl radicals, proving that disinfection occurs in the liquid bulk and not due to adsorption at the volcanic rock.

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Detoxification of parabens using UV-A enhanced by noble metals—TiO2 supported catalysts

Cited by 55 publications

References 39 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

Solar Photocatalytic Degradation of Sulfamethoxazole by TiO2 Modified with Noble Metals

Removal of Enteric Pathogens from Real Wastewater Using Single and Catalytic Ozonation

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