Fabrication of highly visible active N, S co-doped TiO2@MoS2 heterojunction with synergistic effect for photocatalytic degradation of diclofenac: Mechanisms, modeling and degradation pathway

Irandost, Mozhgan; Akbarzadeh, Rokhsareh; Pirsaheb, Meghdad; Asadi, Anvar; Mohammadi, Parviz; Sillanpää, Mika

doi:10.1016/j.molliq.2019.111342

Cited by 65 publications

(17 citation statements)

References 67 publications

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“…The involvement of formed ROS into reaction mechanisms for OTC degradation was confirmed by scavenging tests using TB, AO, and BQ. Molybdenum disulfide (MoS 2 ), a two-dimensional (2D) layered metal chalcogenide with an indirect band gap of 1.1 eV and 1.9 eV direct band gap in monolayered form, with unique structure, low-cost, high thermal stability, and electrostatic integrity, is also a suitable candidate for forming heterojunction with TiO 2 (Type II Heterojunction) [61][62][63]. Hence, Kumar et al [64] reported its application in the photocatalytic degradation of paracetamol.…”

Section: Coupling Of Tio 2 With Metal Sulfidesmentioning

confidence: 99%

“…Hence, Kumar et al [64] reported its application in the photocatalytic degradation of paracetamol. Furthermore, Irandost et al [61] applied the modified MoS 2 /TiO 2 composite (they used N,S-co-doped TiO 2 ) in the photocatalytic degradation of DCF under visible LED lamp irradiation (Table 6). Hence, the synergistic effect of dopants in TiO 2 promoted its visible light activity, yielding the formation of e − /h + pairs in both composite phases.…”

Section: Coupling Of Tio 2 With Metal Sulfidesmentioning

confidence: 99%

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Recent Achievements in Development of TiO2-Based Composite Photocatalytic Materials for Solar Driven Water Purification and Water Splitting

et al. 2020

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Clean water and the increased use of renewable energy are considered to be two of the main goals in the effort to achieve a sustainable living environment. The fulfillment of these goals may include the use of solar-driven photocatalytic processes that are found to be quite effective in water purification, as well as hydrogen generation. H2 production by water splitting and photocatalytic degradation of organic pollutants in water both rely on the formation of electron/hole (e−/h+) pairs at a semiconducting material upon its excitation by light with sufficient photon energy. Most of the photocatalytic studies involve the use of TiO2 and well-suited model compounds, either as sacrificial agents or pollutants. However, the wider application of this technology requires the harvesting of a broader spectrum of solar irradiation and the suppression of the recombination of photogenerated charge carriers. These limitations can be overcome by the use of different strategies, among which the focus is put on the creation of heterojunctions with another narrow bandgap semiconductor, which can provide high response in the visible light region. In this review paper, we report the most recent advances in the application of TiO2 based heterojunction (semiconductor-semiconductor) composites for photocatalytic water treatment and water splitting. This review article is subdivided into two major parts, namely Photocatalytic water treatment and Photocatalytic water splitting, to give a thorough examination of all achieved progress. The first part provides an overview on photocatalytic degradation mechanism principles, followed by the most recent applications for photocatalytic degradation and mineralization of contaminants of emerging concern (CEC), such as pharmaceuticals and pesticides with a critical insight into removal mechanism, while the second part focuses on fabrication of TiO2-based heterojunctions with carbon-based materials, transition metal oxides, transition metal chalcogenides, and multiple composites that were made of three or more semiconductor materials for photocatalytic water splitting.

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Section: Coupling Of Tio 2 With Metal Sulfidesmentioning

confidence: 99%

Section: Coupling Of Tio 2 With Metal Sulfidesmentioning

confidence: 99%

Recent Achievements in Development of TiO2-Based Composite Photocatalytic Materials for Solar Driven Water Purification and Water Splitting

et al. 2020

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“…Lastly, titania nanocrystals produced the least amount of reactive oxygen species over a dose-response relationship, e.g., as much as 675 ± 18% relative fluorescence units at 1000 μg/mL to as little as 210 ± 22% relative fluorescence units at 0.1 μg/mL. Taken together, these data suggest that the cumulative effect of production and consumption of oxygen would ultimately determine the concentration of reactive oxygen species upon irradiation of nanomaterials in water (Nasseri et al 2018;Irandost et al 2019;Li et al 2019).…”

Section: Generation Of Reactive Oxygen Species Under Uv Irradiationmentioning

confidence: 78%

Copper, silver, and titania nanoparticles do not release ions under anoxic conditions and release only minute ion levels under oxic conditions in water: Evidence for the low toxicity of nanoparticles

et al. 2020

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It is widely assumed that the discharge of nanoparticles into the environment may cause adverse effects on organisms. Nonetheless, so far most nanoparticles have demonstrated little to no observed hazards in multiple biological test systems. It is not until nanoparticles undergo transformations, e.g., release of metal ions, that most environmental toxicities are induced, yet the ionization of nanoparticles in natural oxic and anoxic conditions is poorly known. We hypothesized that in anaerobic conditions, where oxidation is absent or limited, metal nanoparticles should not release metal ions. We investigated the transformation of three commercially produced materials, i.e., copper nanoparticles, silver nanoparticles, and titania nanocrystals with an average particle size of 50 nm. The nanoparticles were subjected to different environmental conditions including oxic/anoxic suspension, incubation with natural organic matter, and pH gradient, then subsequently analyzed for zeta potential, hydrodynamic diameter, concentration of released metal ions, and generation of reactive oxygen species. Transmission electron microscopy was used to assess morphological changes. Under oxic conditions, results show that only 9.4 μg/mL of copper ions and 6.9 μg/mL of silver ions were released from nanoparticles, when continuously stirred over 48 h. These levels are low compared to levels found in natural media. Moreover, under anoxic conditions, an insignificant amount of copper ions of 0.9 μg/mL and silver ions, of 0.2 μg/mL, were released. For titania nanoparticle, less than 0.05 μg/ mL ions were released under either oxic or anoxic conditions. Overall, our findings reveal the absence of ion release under anoxic conditions, and the very low levels of ion released under oxic conditions. As a consequence, the toxicity of Cu, Ag, and Ti nanoparticles should be very low in natural media.

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“…Among these methods, nonmetal elements doping have been proved to be helpful in the reduction of bandgap of TiO 2 and made it favourable to use visible light [9]. Until now, the non-metal elements including N, C, S, P, and O have been successfully doped into TiO 2 via various methods such as hydrothermal [3], calcination [10], sol-gel [11] and template method [12]. As for N,S-doped TiO 2 , the frequent route is based on the infiltration of nitrogen and sulphur sources along with annealing treatment [10][11][12][13], which leads to the lower doping efficiency, heterogeneous and uncontrollable.…”

Section: Introductionmentioning

confidence: 99%

“…Since the photocatalytic capability was found by Fujishima and Honda in 1972 [1], TiO 2 has attracted various attention due to its non‐toxic, chemical stability, and low‐cost [2]. However, the wide bandgap (3.2 eV) of pure TiO 2 determines the low visible‐light response which confined its further applications [3]. Therefore, how to expand the absorption of TiO 2 to the visible region has become the research hots.…”

Section: Introductionmentioning

confidence: 99%

Facile route for porous N,S co‐doped TiO ₂ nanoparticles for visible light‐driven photocatalysis

Ouyang

2020

Micro & Nano Letters

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Herein, porous N,S co‐doped TiO2 nanoparticle (N,S‐TiO2) with the high specific surface area were successfully obtained by a simple oil bath reaction and annealing post‐treatment. Especially, abundant nitrogen and sulphur elements were co‐doped into the resulted TiO2 nanoparticles, which greatly improved the visible light absorption ability of the material. The obtained products were characterised by scanning electron microscope, transmission electron microscopy, Brunauer–Emmett–Teller, X‐ray diffraction, Fourier transform‐infrared spectroscopy, ultraviolet–visible diffuse reflectance spectra and X‐ray photoelectron spectroscopy, respectively. In addition, the obtained N,S‐TiO2 exhibited superior tetracycline photocatalytic degradation activity, which can reach 84.9% within 60 min under irradiation of visible light and preserved excellent stability even after five recycles. Furthermore, the possible formation process of N,S‐TiO2 was discussed. In brief, the obtained N,S‐TiO2 can be used as a potential candidate for visible light‐driven photocatalysis.

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Fabrication of highly visible active N, S co-doped TiO2@MoS2 heterojunction with synergistic effect for photocatalytic degradation of diclofenac: Mechanisms, modeling and degradation pathway

Cited by 65 publications

References 67 publications

Recent Achievements in Development of TiO2-Based Composite Photocatalytic Materials for Solar Driven Water Purification and Water Splitting

Recent Achievements in Development of TiO2-Based Composite Photocatalytic Materials for Solar Driven Water Purification and Water Splitting

Copper, silver, and titania nanoparticles do not release ions under anoxic conditions and release only minute ion levels under oxic conditions in water: Evidence for the low toxicity of nanoparticles

Facile route for porous N,S co‐doped TiO ₂ nanoparticles for visible light‐driven photocatalysis

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Fabrication of highly visible active N, S co-doped TiO2@MoS2 heterojunction with synergistic effect for photocatalytic degradation of diclofenac: Mechanisms, modeling and degradation pathway

Cited by 65 publications

References 67 publications

Recent Achievements in Development of TiO2-Based Composite Photocatalytic Materials for Solar Driven Water Purification and Water Splitting

Recent Achievements in Development of TiO2-Based Composite Photocatalytic Materials for Solar Driven Water Purification and Water Splitting

Copper, silver, and titania nanoparticles do not release ions under anoxic conditions and release only minute ion levels under oxic conditions in water: Evidence for the low toxicity of nanoparticles

Facile route for porous N,S co‐doped TiO 2 nanoparticles for visible light‐driven photocatalysis

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Facile route for porous N,S co‐doped TiO ₂ nanoparticles for visible light‐driven photocatalysis