Heterogeneous photo-Fenton processes using zero valent iron microspheres for the treatment of wastewaters contaminated with 1,4-dioxane

Barndõk, Helen; Blanco, Laura; Hermosilla, Daphne; Blanco, Ángeles

doi:10.1016/j.cej.2015.08.097

Cited by 100 publications

(37 citation statements)

References 29 publications

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“…Photocatalytic analysis was performed using a total volume of 50 ml of synthetic solution, which was comprised of 1,4-dioxane (100 mg l −1 ) dissolved in deionized water and TiO 2 catalyst (1 g l −1 ). The concentration of 1,4-dioxane is similar or even lower than the concentration that may be found in industrial wastewater [64,65]. A sample was taken every 30 min, with a total reaction time of 240 min.…”

Section: Photocatalysismentioning

confidence: 99%

“…This synthetic cyclic ether was chosen because it is commonly present in industrial effluents since it is widely used as solvent and it can be produced as by-product in different chemical processes [62,63]. The impact on human health of 1,4-dioxane is of growing interest as it has been classified in Group 2B (as a probable human carcinogen) by the US Environmental Protection Agency (EPA) [62,[64][65][66][67][68]. Conventional solvent removal method and biodegradation treatments are not enough to remove 1,4-dioxane from waste water due to its properties such as high volatility in its pure form but high water solubility [64,65,[69][70][71].…”

Section: Introductionmentioning

confidence: 99%

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Modification of TiO₂ with hBN: high temperature anatase phase stabilisation and photocatalytic degradation of 1,4-dioxane

Byrne¹,

Rhatigan²,

Hermosilla³

et al. 2019

J. Phys. Mater.

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This paper examines the modification of anatase TiO 2 with hexagonal boron nitride (hBN) and the impact this coupling has on the temperature of the anatase to rutile phase transition and photocatalytic activity. All samples were 100% anatase when calcined up to 500°C. At 600°C, all BN-modified samples contain mixed rutile and anatase phases, with 8% and 16% BN-TiO 2 showing the highest anatase contents of 64.4% and 65.5% respectively. The control sample converted fully to rutile at 600°C while the BN modified sample converted to rutile only at 650°C. In addition to TiO 2 phase composition, XRD also showed the presence of bulk boron nitride peaks, with the peak at 26°i ndicating the graphite-like hBN structure. Density functional theory calculations of hBN-rings adsorbed at the anatase (101) surface show strong binding at the interface; new interfacial bonds are formed with key interfacial features being formation of B-O-Ti and N-Ti bonds. Models of extended hBN sheets at the anatase (101) surface show that formation of B-O and N-Ti bonds along the edge of the hBN sheet anchor it to the anatase surface. 16% BN-TiO 2 at 500°C showed a significant increase in the photocatalytic degradation of 1,4-dioxane when compared with pure anatase TiO 2 at 500°C. This arises from the effect of hBN on anatase. The computed density of states (DOS) plots show that interfacing anatase with BN results in a red shift in the TiO 2 energy gap; N-p states extend the valence band maximum (VBM) to higher energies. This facilitates transitions from high lying N-p states to the Ti-d conduction band. A simple photoexcited state model shows separation of electrons and holes onto TiO 2 and BN, respectively, which promotes the photocatalytic activity.

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Section: Photocatalysismentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Modification of TiO₂ with hBN: high temperature anatase phase stabilisation and photocatalytic degradation of 1,4-dioxane

Byrne¹,

Rhatigan²,

Hermosilla³

et al. 2019

J. Phys. Mater.

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“…Heat (Lee et al 2012; Johnson et al 2008; Ghauch et al 2012), base (Furman et al 2010; Liang et al 2007; Liang and Guo 2012), and transition metals (Li el al. 2017; Cheng et al 2016; Barndok et al 2016) are commonly used activators for ISCO. This study will focus on two activators practical for in-situ applications, ferrous ion (Fe 2+ ) and base (NaOH).…”

Section: Introductionmentioning

confidence: 99%

Treatment of 1,4-dioxane and trichloroethene co-contamination by an activated binary persulfate-peroxide oxidation process

Yan

Liu

et al. 2018

Environ Sci Pollut Res

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The efficacy of a binary oxidant system, hydrogen peroxide (HO) and persulfate, was investigated for treatment of 1,4-dioxane (dioxane) and trichloroethene (TCE) co-contamination. Batch experiments were conducted to examine the catalytic efficiency of Fe and NaOH-based activation, oxidant decomposition rates, contaminant degradation effectiveness, and competitive degradation effects. For NaOH activation, the oxidant decomposition rate was moderate and sustained during the entire test period of 96 h. However, dioxane degradation was limited (~ 33%). Conversely, the oxidants were depleted within 24 h for the Fe-activated system, and dioxane degradation was complete within 4 h. The activation and radical generation processes were different between Fe and NaOH activation. Both dioxane and TCE underwent complete degradation in the co-contaminant experiment. The results of this study indicate that the Fe-catalyzed binary hydrogen peroxide-persulfate oxidant system is effective for oxidation of the tested contaminants separately and as co-contaminants.

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“…The significant improvement in the reaction rate is attributed to generation of additional • OH and regeneration of photo-recovered Fe 2þ in the presence of light. [32] Thus, reaction conditions undoubtedly manifest the relevance of light, oxidant, and ferrite on the photoFenton degradation procedure. Similar results were observed while using PMS as oxidant.…”

Section: Control Experimentsmentioning

confidence: 99%

Spinel Ferrite Mediated Photo‐Fenton Degradation of Phenolic Analogues: A Detailed Study Employing Two Distinct Inorganic Oxidants

Sharma

Singhal

2017

CLEAN Soil Air Water

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The present work demonstrates the applicability of ferrites as photo-Fenton catalysts for deterioration of different phenolic derivatives. To analyze optimal reaction conditions, experiments are performed with four magnetic spinel ferrites MFe 2 O 4 (M ¼ Co, Cu, Ni, and Zn) and two inorganic oxidants, i.e., hydrogen peroxide (HP) and potassium peroxymonosulfate (PMS). The reactions are performed using p-nitrophenol as phenolic probe. CuFe 2 O 4 and CoFe 2 O 4 possessed excellent ability to activate HP and PMS, respectively, among all four synthesized catalysts. A noteworthy aspect of two oxidizing agents is that the concentration of PMS used during the reaction is four times less than HP. Further, the broad pH activity of PMS provides a significant advantage over HP. The optimal reaction conditions, when HP is the oxidant in the photo-Fenton degradation, are 0.50 g L À1 MFe 2 O 4 , pH 2.5, and 8.8 mM HP. Although PMS is active in a wide pH range (2-10), adequate reaction conditions are 0.50 g L À1 MFe 2 O 4 , natural pH, and 2.2 mM PMS.The photo-Fenton activity of ferrites is extended to the degradation of different nitro-and chloro-analogs of phenol (2-nitrophenol, 3-nitrophenol, 4-nitrophenol, 2,4-dinitrophenol, 2,4,6-trinitrophenol, 2-chlorophenol, 3-chlorophenol, 4-chlorophenol, 2,4-dichlorophenol) with only two ferrites (CuFe 2 O 4 and CoFe 2 O 4 ). A comparative study is performed with the two oxidants (HP and PMS) with positive results. Finally, stability and reusability of magnetic ferrites as catalysts are also studied to prove their use in phenolic solution treatment.

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Heterogeneous photo-Fenton processes using zero valent iron microspheres for the treatment of wastewaters contaminated with 1,4-dioxane

Cited by 100 publications

References 29 publications

Modification of TiO₂ with hBN: high temperature anatase phase stabilisation and photocatalytic degradation of 1,4-dioxane

Modification of TiO₂ with hBN: high temperature anatase phase stabilisation and photocatalytic degradation of 1,4-dioxane

Treatment of 1,4-dioxane and trichloroethene co-contamination by an activated binary persulfate-peroxide oxidation process

Spinel Ferrite Mediated Photo‐Fenton Degradation of Phenolic Analogues: A Detailed Study Employing Two Distinct Inorganic Oxidants

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Heterogeneous photo-Fenton processes using zero valent iron microspheres for the treatment of wastewaters contaminated with 1,4-dioxane

Cited by 100 publications

References 29 publications

Modification of TiO2 with hBN: high temperature anatase phase stabilisation and photocatalytic degradation of 1,4-dioxane

Modification of TiO2 with hBN: high temperature anatase phase stabilisation and photocatalytic degradation of 1,4-dioxane

Treatment of 1,4-dioxane and trichloroethene co-contamination by an activated binary persulfate-peroxide oxidation process

Spinel Ferrite Mediated Photo‐Fenton Degradation of Phenolic Analogues: A Detailed Study Employing Two Distinct Inorganic Oxidants

Contact Info

Product

Resources

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Modification of TiO₂ with hBN: high temperature anatase phase stabilisation and photocatalytic degradation of 1,4-dioxane

Modification of TiO₂ with hBN: high temperature anatase phase stabilisation and photocatalytic degradation of 1,4-dioxane