Elucidation of background organic matter matrix effect on photocatalytic treatment of contaminants using TiO2: A review

Uyguner-Demirel, Ceyda Senem; Birben, Nazmiye Cemre; Bekbölet, Miray

doi:10.1016/j.cattod.2016.12.030

Cited by 108 publications

(27 citation statements)

References 112 publications

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“…As one of the promising technologies with great potentials for energy and environment sustainability, solar-driven photocatalysis stringently requires effective semiconductor photocatalysts of broad absorption to visible-light, significant reactivity and remarkable stability under sunlight illumination [1][2][3][4][5][6]. Although exploring novel photocatalysts with stable crystal structures is appealing and exciting, tuning the electronic band structure of existing stable photocatalysts without significant change of crystallographic polymorph is a rather reliable and simple approach to tailoring their function.…”

Section: Graphic Abstractmentioning

confidence: 99%

Rapid synthesis of BiOBrxI1-x photocatalysts: Insights to the visible-light photocatalytic activity and strong deviation from Vegard’s law

et al. 2019

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Corresponding Authors: z.jiang@soton.ac.uk (ZJ), peter.edwards@chem.ox.ac.uk(PPE) Research Highlights  A rapid ultrasonication synthesis was adopted to prepare BiOBrxI1-x solid solutions;  Lattice parameters of the BiOBrxI1-x solid solutions strongly deviate from Vegard's law;  The nonlinear dependence of bandgaps on Br/I ratio are clarified;  Tuning I/Br ratios can tune both the VBM and CBM of the BiOBrxI1-x solid solutions;  The Bi-rich BiOBrxI1-x solid solutions are superior to BiOBr in photodegradation of RhB Abstract A series of visible-light-responsive BiOBrxI1-x solid solutions were prepared by a rapid and efficient ultrasonication synthesis and applied in photodegradation of Rhodamine B in aqueous solution. The detailed characterisations showed that the lattice parameters and their band structures of the BiOBrxI1-x solid solutions significantly deviated from the well-established Vegard's law for solid solution materials. The Mulliken electronegativity and valence band XPS analyses revealed that the substitution of Br by less electronegative iodine can simultaneously modulate the edges of conductance and valence band of the BiOBr, leading to nonlinear dependence of bandgap (Eg) on the halogen anion concentrations. Although the solid solution displayed superior RhB photodegration activity to BiOI, only Br-rich BiOBrxI1-x solid solutions (x>0.5) were more active than BiOBr and BiOI, with the optimal one is BiOBr0.75I0.25. The Brdependence of bandstructure and photocatalytic activity for the BiOBrxI1-x solid solutions as well as their rate-limiting radical species were also clarified based on experimental and theoretical analyses.

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Section: Graphic Abstractmentioning

confidence: 99%

Rapid synthesis of BiOBrxI1-x photocatalysts: Insights to the visible-light photocatalytic activity and strong deviation from Vegard’s law

et al. 2019

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“…The UV-A radiation (λ = 365 nm) with TiO 2 P25 result in complete removal after 180 min in first-order kinetics with Kap = 20.3 10 −3 min −1 , with 5 mgL −1 as initial concentration and 200 mg L −1 as the addition of the TiO2 P25 [3]. The complete mineralization of BPA was at pH 3 after 120 min; intermediates formed at higher pH values are most stable and therefore difficult to be decomposed and mineralized [13,14]. The TiO 2 sources as anatase, rutile, brookite, and their mixtures indicate the lower uptakes with less than 6% were over the raw TiO 2 .…”

Section: Single − Aromatic Intermediates + ˙Oh → Aromatic Ring Openedmentioning

confidence: 99%

Green Water Treatment for Pharmaceutical Pollution

Ortiz¹

2019

Green Chemistry [Working Title]

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Environmental sustainability demands the advancement in water treatment and the use of lighting natural resources. Brazil has one of the most stable and intense solar irradiation in the world. It has to be used not only for energy generation purposes but also and mostly for water treatment, water quality polishment, and furthermore water disinfection. The chapter performs a comparison of different green technologies for water treatment as natural solar irradiation, simulated solar photolysis, solar photo-Fenton with and without hydrogen peroxide addition (solar/ Fe), solar photo-Fenton with and without peroxide (solar/Fe/H 2 O 2), titanium oxide-mediated photocatalysis (UV/TiO 2), photolysis under UV irradiation, and UV treatment with hydrogen peroxide (UV/H 2 O 2). The chapter describes the solar photodecomposition calculations for pharmaceuticals and the emerging pollutants mostly found in polluted waters, including the decomposition route, kinetics, and process parameters. Many published works to point out the important properties to evaluate catalyzer and semiconductor materials after their use in photodecomposition processes. The essay includes the solar photodecomposition of dyes, carbamazepine, hormones, acetaminophen, antipyrine, bisphenol A, antibiotics, and the photodecomposition by-products. Finally, the chapter presents the synergistic effect between them with the probable mechanism and mineralization degree.

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“…Photocatalytic oxidation belongs to advanced oxidation processes (AOPs), which combine powerful oxidizing agents (catalytic initiators) with UV or near-UV light for the removal of resistant organic pollutants and xenobiotics [11][12][13][14][15]. Among them, photocatalytic oxidation has been proven to be a promising technology for water treatment in order to destruct a variety of organic and inorganic contaminants [15][16][17]. The majority of the photocatalysts studied are based on semiconductor materials [18,19].…”

Section: Introductionmentioning

confidence: 99%

Decolorization of Orange-G Aqueous Solutions over C60/MCM-41 Photocatalysts

et al. 2019

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The majority of the photocatalysts studied for azo-dye degradation are based on semiconductor materials. Studies reported on non-semiconducting materials are very scarce. In the present work, we studied the fullerene (C60) ability to accelerate photodegradation of the dye’s azo bond in the presence of ascorbic acid. A series of C60 supported on ordered mesoporous silica (MCM-41) catalysts, containing 1, 3, 6, 9, and 12 wt % of fullerene C60, was studied using Orange G (OG) as representative azo-dye. This study showed that partial decolorization is achieved in the dark by simple adsorption of the dye on the bare surface of the carrier. The extent of decolorization increases with the irradiation of the suspension due to photocatalytic degradation of the azo-bond. This is maximized over the sample containing 3 wt % of C60 and it has been attributed to the best combination of the extent of the dye adsorption with the high intrinsic photocatalytic activity of small C60 clusters predominated in this sample. This catalyst proved to be quite stable upon five subsequent photocatalytic cycles, losing less than 5% of its initial activity. No degradation of OG takes place in the absence of ascorbic acid.

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Elucidation of background organic matter matrix effect on photocatalytic treatment of contaminants using TiO2: A review

Cited by 108 publications

References 112 publications

Rapid synthesis of BiOBrxI1-x photocatalysts: Insights to the visible-light photocatalytic activity and strong deviation from Vegard’s law

Rapid synthesis of BiOBrxI1-x photocatalysts: Insights to the visible-light photocatalytic activity and strong deviation from Vegard’s law

Green Water Treatment for Pharmaceutical Pollution

Decolorization of Orange-G Aqueous Solutions over C60/MCM-41 Photocatalysts

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