Photocatalytic mechanism of metoprolol oxidation by photocatalysts TiO 2 and TiO 2 doped with 5% B: Primary active species and intermediates

Cavalcante, Rodrigo Pereira; Dantas, Renato F.; Bayarri, B.; González, Óscar Clavería; Giménez, José Carlos Moreno; Esplugás, Santiago; Machulek, Amílcar

doi:10.1016/j.apcatb.2016.04.054

Cited by 104 publications

(46 citation statements)

References 70 publications

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“…4,9 Electrons ejected to the conduction band can react with electron acceptors, such as molecular oxygen adsorbed onto the catalyst surface, forming superoxide anion radicals, O 2 •− (equation 6), 4 which react with protons to form hydroperoxyl radicals (HO 2 • ). Coupling of these radicals generates H 2 O 2 , which, undergoing photolysis, yield additional HO…”

Section: Introductionmentioning

confidence: 99%

Synthesis, Characterization, and Photocatalytic Activity of Pure and N-, B-, or Ag- Doped TiO2

Bezerra¹,

Cavalcante²,

Garcia³

et al. 2017

J. Braz. Chem. Soc.

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This article reports the synthesis and characterization of pure and N-, B-, and Ag-doped TiO 2 and the ability of these oxides to photodegrade methylene blue (MB) under sunlight or UV-ABC radiation. The compounds were synthesized using the sol-gel method and characterized by scanning electron microscopy, X-ray diffraction, diffuse reflectance spectroscopy, Fourier transform infrared spectroscopy, thermogravimetric analysis, and X-ray photoelectron spectroscopy. Photocatalytic efficiency was significantly increased by N-doping, resulting in 98% MB decomposition under UV-ABC irradiation for 180 min. Ag-and B-doped TiO 2 lowered MB degradation rates to 52 and 73%, respectively, compared with pure TiO 2 . The same behavior was observed with exposure to UV-Vis, with 88, 65, 60, and 42% MB removal with N-doped, pure, B-doped, and Ag-doped TiO 2 , respectively. Under visible light alone, N-doped TiO 2 exhibited higher photocatalytic efficiency than commercial P25-type TiO 2 . Photocatalysis with N-doped TiO 2 proved to be a promising alternative for MB degradation, given the potential of employing solar energy, thus minimizing operating costs.

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Section: Introductionmentioning

confidence: 99%

Synthesis, Characterization, and Photocatalytic Activity of Pure and N-, B-, or Ag- Doped TiO2

Bezerra¹,

Cavalcante²,

Garcia³

et al. 2017

J. Braz. Chem. Soc.

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“…[11] AOPs seem highly promising for treating drugs because they produce strong oxidizing species like hydroxyl radical ( * OH) and other reactive oxygen species (ROS), leading to mineralization of most organic pollutants in water. [4,[12][13][14] Photoelectro-Fenton (PEF) is one of the most powerful electrochemical AOPs (EAOPs). It is a sequential or hybrid process in which the oxidation power of * OH generated on site is synergistically combined with the photolytic ability of UVA photons.…”

Section: Introductionmentioning

confidence: 99%

Assessment of 4‐Aminoantipyrine Degradation and Mineralization by Photoelectro‐Fenton with a Boron‐Doped Diamond Anode: Optimization, Treatment in Municipal Secondary Effluent, and Toxicity

et al. 2019

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a] 4-Aminoantipyrine (4-AA), a persistent metabolite of dipyrone found in natural water, has been treated in 100 mL of aqueous 0.050 M Na 2 SO 4 solutions at pH 3.0 by photoelectro-Fenton (PEF) with a 4 W UVA lamp. The assays were performed in a cell equipped with a boron-doped diamond (BDD) anode and an air-diffusion cathode for H 2 O 2 generation. The formation of an unstable Fe(III)-4-AA complex with 1 : 2 molar ratio was evidenced. A 2 4 central composite design was used to assess the effect of four independent variables on PEF performance.The optimized conditions for 62.5 mg L À 1 4-AA were: current density of 77.5 mA cm À 2 and 47.75 mg L À 1 Fe 2 + , yielding 99 % 4-AA degradation at 7 min, and 45 % 4-AA mineralization with 3.2 % mineralization current efficiency at 130 min. Slightly slower degradation and similar mineralization were obtained under these conditions when 4-AA was spiked into a municipal secondary effluent, showing a low influence of natural organic matter on PEF. The initially high acute toxicity determined using Artemia salina was largely diminished upon PEF treatment.

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“…TiO2 has three crystalline phases, thus rutile, anatase, and brookite. For photocatalytic water treatment purposes, rutile and anatase are the two favourable crystalline phases because of their appropriate band gaps (3.2 eV for anatase and 3.0 eV for rutile) [104]. As illustrated in Figure 1.…”

Section: Photocatalytic Processesmentioning

confidence: 99%

“…TiO2 for photocatalytic removal of various micropollutants [110][111][112][113][114], e.g. 2-methyl-4chlorophenoxyacetic acid (MCPA) [115][116][117], mecoprop [118], clopyralid [118], metoprolol [104,119], 2,4-Dichlorophenoxyacetic Acid (2,4-D) [120], etc. For instance, Calza et al [61] reported efficient diclofenac removal over aqueous TiO2 suspensions.…”

Section: Figure 1 2 Schematic Representation Of Principles Of Photocmentioning

confidence: 99%

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Micropollutant degradation in water by photochemical processes

Yin¹

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Fast growing global population and economy result in an increasing water consumption worldwide. However, the amounts of usable water resources are limited: more than one-third of the accessible renewable fresh water on Earth is being exploited for industrial, agricultural, as well as domestic usage [1]. Locally, especially in water scarce areas, this is often reaching much higher levels, leading to overdraft of water resources [2]. Such facts call for the need to not only exploit new and alternative water resources but also to recycle water streams, to cope with the unfortunate increasing limitations in availability of fresh water sources. Meanwhile, the fast growing population and economy are leading to serious water pollution due to discharge of numerous contaminants into the environment, which in turn possess sever threats to the quality of water resources. Thus, the increasing worldwide demand for water consumption, the limited amount of water resources, and the water pollution make water treatment a vital measure to safeguard the water supply with sufficient quantity and quality that meets the demand of the society. Conventionally, concerns were given to pathogens, nutrients, heavy metals, suspended solids, and bulk organic pollutants (the amount of bulk organic pollutants generally present in concentrations at 0.1-10 g/l in waste water and often denoted with COD or BOD, meaning chemical or biological oxygen demand). Thus in most parts of the world water purification measures have been taken to tackle these problems [3, 4]. In recent decades, many emerging organic pollutants (generally present at rather low concentrations, i.e. ng/L to µg/L level, and therefore also termed as micropollutants). These include pharmaceuticals, antibiotics, herbicides, pesticides, chemicals from personal care products, etc., and have been detected the last two decades extensively in different water bodies worldwide. For instance, many pharmaceuticals were found in various portions of the aquatic system, i.e. in ground water, surface water, as well as in many drinking water sources according to a broad range of studies [5-11]. In a study conducted by Félix-Cañedo et al. in Mexico City, the presence of a group of organic micropollutants (including pharmaceuticals, hormones, herbicides) in several drinking water sources was reported, at concentrations ranging from ng/L to µg/L level [12]. In recent years, a broad range of micropollutants, including Other investigated homogeneous photochemical processes include UV/Cl2, UV/O3, UV/HOCl, UV/ClO2. Application of these techniques for removal of various micropollutants has been studied over last decades. It is reported that UV/Cl2 could achieve relatively good removal of carbamazepine from wastewater, but formation of toxic chlorinated byproducts was an issue [132, 133]. Kong et al. reported efficient degradation of atrazine by UV/Cl2 [134]. Examples of micropollutant removal by UV/O3, UV/HOCl, UV/ClO2, etc., are also abundant in literature [135-138]. 1.3 Research opportunities 1.3.1 Rese...

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Photocatalytic mechanism of metoprolol oxidation by photocatalysts TiO 2 and TiO 2 doped with 5% B: Primary active species and intermediates

Cited by 104 publications

References 70 publications

Synthesis, Characterization, and Photocatalytic Activity of Pure and N-, B-, or Ag- Doped TiO2

Synthesis, Characterization, and Photocatalytic Activity of Pure and N-, B-, or Ag- Doped TiO2

Assessment of 4‐Aminoantipyrine Degradation and Mineralization by Photoelectro‐Fenton with a Boron‐Doped Diamond Anode: Optimization, Treatment in Municipal Secondary Effluent, and Toxicity

Micropollutant degradation in water by photochemical processes

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