Dataset Information

Boosted Visible-Light Photodegradation of Methylene Blue by V and Co Co-Doped TiO?.

ABSTRACT: In this work, TiO? photocatalysts, co-doped with transition metal ions vanadium (V) and cobalt (Co) ((V,Co)?TiO?), were synthesized by the sol?gel method. The synthesized photocatalysts were characterized by X-ray diffraction (XRD), transmission electron microscopy (TEM), X-ray photoelectron spectroscopy (XPS), nitrogen adsorption and desorption measurement, UV-Vis absorption and photoluminescence spectrum (PL) spectra. The results show that V and Co co-doping has significant effects on sample average crystalline grain size, absorption spectrum, recombination efficiency of photo-induced electron-hole pairs (EHPs), and photocatalytic degradation efficiency of methylene blue (MB). (V,Co)?TiO? photocatalyst exhibits an obvious red shift of the absorption edge to 475 nm. Photocatalytic degradation rate of (V,Co)?TiO? sample for MB in 60 min is 92.12% under a Xe lamp with a cut-off filter (? > 400 nm), which is significantly higher than 56.55% of P25 under the same conditions. The first principles calculation results show that V and Co ions doping introduces several impurity energy levels, which can modulate the location of the valence band and conduction band. An obvious lattice distortion is produced in the meantime, resulting in the decrease in photo-generated EHP recombination. Thus, (V,Co)?TiO? photocatalyst performance is significantly improved.

SUBMITTER: Lv T

PROVIDER: S-EPMC6213182 | biostudies-literature | 2018 Oct

REPOSITORIES: biostudies-literature

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Boosted Visible-Light Photodegradation of Methylene Blue by V and Co Co-Doped TiO₂.

Lv Tianping T Zhao Jianhong J Chen Mingpeng M Shen Kaiyuan K Zhang Dongming D Zhang Jin J Zhang Genlin G Liu Qingju Q

Materials (Basel, Switzerland) 20181011 10

In this work, TiO₂ photocatalysts, co-doped with transition metal ions vanadium (V) and cobalt (Co) ((V,Co)⁻TiO₂), were synthesized by the sol⁻gel method. The synthesized photocatalysts were characterized by X-ray diffraction (XRD), transmission electron microscopy (TEM), X-ray photoelectron spectroscopy (XPS), nitrogen adsorption and desorption measurement, UV-Vis absorption and photoluminescence spectrum (PL) spectra. The results show that V and Co co-doping has significant effects on sample a ...[more]

PMID: 30314386

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Project description:The growing threat of emerging waterborne contaminants is a global concern, fuelled in part by the ineffectiveness of current remediation strategies. One of the most prominent remediation strategies is catalytic photodegradation, particularly with TiO2 nanoparticles (NPs), but its full utilization is hampered by using only UV radiation, which is scarce in sunlight. To fully benefit from the sunlight abundance, several efforts are focused on the tailoring of TiO2 to make it more active in visible (Vis) light. However, this target is yet to be met, sought for new developments. In a recent research paper entitled "Visible light-driven photodegradation of triclosan and antimicrobial activity against Legionella pneumophila with cobalt and nitrogen co-doped TiO2 anatase nanoparticles" [ 1 ], we investigated the co-doping potential of cobalt and nitrogen in TiO2 NPs for water decontamination, focusing on its application for the degradation of triclosan (TCS) under Vis LED light irradiation. Herein, the synthesis methodology for the preparation of doped TiO2 with nitrogen is described in detail, along with complementary data on the characterisation of all previously synthesised photocatalysts in the form of specific surface area determination (B.E.T. method) based on the obtained physisorption isotherms, X-ray photoelectron spectroscopy (XPS), and the automatic determination of bandgap energy through the diffuse reflectance spectra (DRS) analysis by using the GapExtractor© software. This dataset article also includes optimised photocatalytic reaction conditions, specifically conducted under monochromatic LED light irradiation. The employed LED irradiation conditions can support photocatalytic research in the field, since LED systems are costless and have a long-life span compared to most conventional UV-Vis systems. In addition, raw UV-Vis spectra and high-performance liquid chromatography (HPLC) chromatograms for monitoring the TCS degradation reaction are also included, as are powder X-ray diffractograms (XRD) of recycled doped-TiO2 photocatalysts, confirming the renewable efficiency of the synthesised photocatalysts to pursue green chemistry principles.

Dataset Information

Boosted Visible-Light Photodegradation of Methylene Blue by V and Co Co-Doped TiO?.

Publications

Boosted Visible-Light Photodegradation of Methylene Blue by V and Co Co-Doped TiO₂.

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