Photocatalytic degradation and mineralization of microcystin-LR under UV-A, solar and visible light using nanostructured nitrogen doped TiO2

Triantis, Theodoros M.; Fotiou, Theodora; Kaloudis, Triantafyllos; Kontos, Athanassios G.; Falaras, Polycarpos; Dionysiou, D. D.; Pelaez, Miguel; Hiskia, Anastasia

doi:10.1016/j.jhazmat.2011.11.042

Cited by 87 publications

(50 citation statements)

References 36 publications

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“…The addition of Evonik/Degussa P25 into visible light active NFTiO 2 was found to play a significant role in improving BET surface area, pore volume, porosity and the total TiO 2 mass content in the film [208]. Triantis et al [209] reported the mineralisation of MC-LR under various light sources. When irradiated with visible light over a wavelength of 4410 nm, standards such as Evonik/Degussa P25 and TiO 2 were seen to be completely inactive whereas the degradation of the toxin was easily achieved by N-TiO 2 due to a red-shift of the energy band gap to the visible light region (2.3 eV).…”

Section: R Fagan Et Al / Materials Science In Semiconductor Processingmentioning

confidence: 99%

A review of solar and visible light active TiO2 photocatalysis for treating bacteria, cyanotoxins and contaminants of emerging concern

Fagan

McCormack

Dionysiou

et al. 2016

Materials Science in Semiconductor Processing

497

195

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Section: R Fagan Et Al / Materials Science In Semiconductor Processingmentioning

confidence: 99%

A review of solar and visible light active TiO2 photocatalysis for treating bacteria, cyanotoxins and contaminants of emerging concern

Fagan

McCormack

Dionysiou

et al. 2016

Materials Science in Semiconductor Processing

497

195

View full text Add to dashboard Cite

“…Doping NTO with metals and non-metals creates new energy levels between the VB and CB of TiO 2 [121], which in turn reduces its band gap and helps the doped catalyst to absorb in the visible region (Figure 4). Recently, researchers have reported the successful doping of vanadium [122], iron [123], rhodium [50], palladium [124], and silver [125] metals, and carbon [105,126], nitrogen [51,96,105,121,124,127,128], sulfur [98,129], fluorine [96], and iodine [130] non-metals in NTO to achieve the visible light photocatalytic degradation of various chemicals and Escherichia coli in aqueous solution (Table 3). In all reports, except in silver doping, the visible light photocatalytic activity was mainly attributed to the associated red shift that originated from the creation of local bands between the VB and CB of NTO (Figure 4).…”

Section: Dopingmentioning

confidence: 99%

Photocatalytic Water Treatment by Titanium Dioxide: Recent Updates

Varghese²,

2012

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Photocatalytic water treatment using nanocrystalline titanium dioxide (NTO) is a well-known advanced oxidation process (AOP) for environmental remediation. With the in situ generation of electron-hole pairs upon irradiation with light, NTO can mineralize a wide range of organic compounds into harmless end products such as carbon dioxide, water, and inorganic ions. Photocatalytic degradation kinetics of pollutants by NTO is a topic of debate and the mostly reporting Langmuir-Hinshelwood kinetics must accompanied with proper experimental evidences. Different NTO morphologies or surface treatments on NTO can increase the photocatalytic efficiency in degradation reactions. Wisely designed photocatalytic reactors can decrease energy consumption or can avoid post-separation stages in photocatalytic water treatment processes. Doping NTO with metals or non-metals can reduce the band gap of the doped catalyst, enabling light absorption in the visible region. Coupling NTO photocatalysis with other water-treatment technologies can be more beneficial, especially in large-scale treatments. This review describes recent developments in the field of photocatalytic water treatment using NTO.

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“…7b). In fact, several authors reported that MC-LR removal by UV radiation alone is not efficient [9,11,[44][45][46][47], since the cyclic structure of the MC-LR (Fig. 7c) provides a high stability under sunlight and high temperatures (they can with-stand after many hours of boiling) [48][49][50][51].…”

Section: Oxidation Of Mc-lr By Photocatalysis Using Tio2 Based Paintmentioning

confidence: 99%

“…Upon absorption of suitable energy photons, electrons are injected from the valence to the conduction band of the semiconductor creating electron/hole pairs that originate mostly highly oxidizing hydroxyl and highly reduction superoxide radicals [8]. These species lead to the mineralization of different organic pollutants [4,9,10], including cyanotoxins [11]. Photocatalysis using TiO2 has been previously shown to effectively destroy MC-LR and related toxins in aqueous solutions even at extremely high concentrations [12,13].…”

Section: Introductionmentioning

confidence: 99%

Oxidation of microcystin-LR and cylindrospermopsin by heterogeneous photocatalysis using a tubular photoreactor packed with different TiO2 coated supports

Pinho

Azevedo

Miranda

et al. 2015

Chemical Engineering Journal

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The photocatalytic degradation of cyanotoxins in aqueous solutions using slurry suspensions of TiO2 implies a post-filtration step to retain the photocatalyst. In this work, 2D and 3D TiO2 thin films sup-ported in inert surfaces was proposed for the solar photocatalytic removal of cyanotoxins microcystin-LR (MC-LR) or cylindrospermopsin (CYN) in distilled and natural water under neutral pH conditions. The photocatalytic experiments were performed in a lab-scale tubular photoreactor with a compound parabolic collector (CPC) using simulated and natural solar radiation. The tubular photoreactor was packed with transparent cellulose acetate monoliths (CAM) coated with a P25 paste or sol-gel 2D TiO2 film or with a photocatalytic 3D TiO2-loaded exterior paint (PC500, VLP7000 and P25). The efficiency of the TiO2 photocatalytic system in the presence of hydrogen peroxide was also assessed. PVC or glass tubes and glass spheres, coated with a photocatalytic 3D TiO2-loaded exterior paint, were also tested as inert surfaces. The supports used in this work were chosen according to some characteristics, such as cost, surface resistance, surface area and transmissibility to UV radiation. The 2 toxins MC-LR and CYN were purified from Microcysts aeruginosa and Cylindrospermopsis raciborskii cultures, respectively. The photocatalytic system P25-CAM/H2O2 can be considered the most effective process, considering the cyanotoxins removal efficiency, the cost and the simplicity of the preparation.

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Photocatalytic degradation and mineralization of microcystin-LR under UV-A, solar and visible light using nanostructured nitrogen doped TiO2

Cited by 87 publications

References 36 publications

A review of solar and visible light active TiO2 photocatalysis for treating bacteria, cyanotoxins and contaminants of emerging concern

A review of solar and visible light active TiO2 photocatalysis for treating bacteria, cyanotoxins and contaminants of emerging concern

Photocatalytic Water Treatment by Titanium Dioxide: Recent Updates

Oxidation of microcystin-LR and cylindrospermopsin by heterogeneous photocatalysis using a tubular photoreactor packed with different TiO2 coated supports

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