Novel formation of large area N-TiO2/graphene layered materials and enhanced photocatalytic degradation of antibiotics

Zhao, Wei; Duan, Jieli; Ji, Bang; Ma, Lizhe; Yang, Zhou

doi:10.1016/j.jece.2018.02.014

Cited by 36 publications

(12 citation statements)

References 25 publications

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“…Many methods have been investigated to achieve the visible light active TiO 2 photocatalyst. The methods followed made visible light activity by the doping of TiO 2 with transition metals [ 20 ]; doping of TiO 2 with non-metals [ 21 ]; and coupling of TiO 2 with grapheme et al [ 22 ]. It could extend the absorption property in the visible region.…”

Section: Introductionmentioning

confidence: 99%

Enhanced Antibacterial Activity of Silver Doped Titanium Dioxide-Chitosan Composites under Visible Light

Xie

Xia

et al. 2018

Materials

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Nano titanium dioxide (TiO2) with photocatalytic activity was firstly modified by diethanolamine, and it was then doped with broad spectrum antibacterial silver (Ag) by in situ method. Further, both Ag doped TiO2-chitosan (STC) and TiO2-chitosan (TC) composites were prepared by the inverse emulsion cross-linking reaction. The antibacterial activities of STC composites were studied and their antibacterial mechanisms under visible light were investigated. The results show that in situ doping and inverse emulsion method led to good dispersion of Ag and TiO2 nanoparticles on the cross-linked chitosan microsphere. The STC with regular particle size of 1–10 μm exhibited excellent antibacterial activity against E. coli, P. aeruginosa and S. aureus under visible light. It is believed that STC with particle size of 1–10 μm has large specific surface area to contact with bacterial cell wall. The increased antibacterial activity was attributed to the enhancement of both electron-hole separations at the surface of nano-TiO2 by the silver ions under the visible light, and the synergetic and sustained release of strong oxidizing hydroxyl radicals of nano-TiO2, together with silver ions against bacteria. Thus, STC composites have great potential applications as antibacterial agents in the water treatment field.

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Section: Introductionmentioning

confidence: 99%

Enhanced Antibacterial Activity of Silver Doped Titanium Dioxide-Chitosan Composites under Visible Light

Xie

Xia

et al. 2018

Materials

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“…The N2p form impurity states above the valance band (VB), which narrows the band gap energy of TiO 2 . According to literature reports, 37,38 Ti 4+ is reduced to Ti 3+ and oxygen vacancies can significantly prolong the lifetime of photo-electrons and restrain the recombination of photogenerated electrons and holes. The holes of the VB react with hydroxyl groups (OH − ) to generate •OH radicals.…”

Section: Resultsmentioning

confidence: 99%

Improving the photocatalytic activity of nitrogen-doped surface defect TiO_2-x nanobelts for degradation of organic pollutants

Zhang

Qin

Chen

et al. 2020

Journal of Chemical Research

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The synthesis of surface defect TiO2-x nanobelts with excellent visible light absorption is important to reduce costs, increase stability, and improve photocatalytic activity. In this work, we report that nitrogen-doped surface defect TiO2-x nanobelts are synthesized by annealing pristine TiO2 nanobelts in Ar/H2 (95%/5%) atmosphere followed by subsequent heat treatment in NH3 at various temperatures. The aim is to study the effect of the extent of the N-doping amount in the lattice of TiO2-x nanobelts on light absorption and photocatalytic activity. Considering the increase in organic pollutants in wastewater, the photocatalytic activity is measured by degrading rhodamine B (RhB) dye in water. The results demonstrate that the calcination temperature affects the doping level of N, and the b-TiO2-N550 sample exhibits higher photocatalytic performance than that of other samples under visible-light irradiation for the degradation of rhodamine B, which is up to 96.11%. The enhancement is ascribed to the synergistic effect of N-doping and self-doping oxygen vacancy (which extend the visible light absorption) and the separation efficiency of photogenerated carriers, which improves the photocatalytic activity.

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“…It is evident that in the high-voltage region, the reaction rate with the addition of catalyst has obvious advantages. This is because a higher applied voltage realized an improved activity and stability of the TiO 2 catalyst [17]. At the same time, the UV light and heat generated during the discharge can also directly act on the TIA molecules and the TiO 2 catalyst to enhance the degradation effect [18].…”

Section: The Effect Of Applied Voltage On the Degradation Of Tiamentioning

confidence: 99%

Degradation of tiamulin by a packed bed dielectric barrier plasma combined with TiO₂ catalyst

Yang¹,

Shen²,

Liu³

et al. 2022

Plasma Sci. Technol.

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Recently, the plasma catalyst was employed to efficient degrade the antibiotics residue in environment. In this study, the plasma generated in the packed bed dielectric barrier reactor (PBR) combined with TiO2 catalyst is used to degrade the antibiotic Tiamulin (TIA) that loads on the surface of simulated soil particles. The effects of applied voltage, composition of the working gas, gas flow rate, presence or absence of catalyst on the degradation effect were studied. It is found that plasma and catalyst can produce a synergistic effect at optimal conditions ( applied voltage 25 kV, O2 ratio 1%, gas flow rate 0.6 L/min， treatment time 5 minutes). The degradation efficiency of plasma combined catalyst can reach 78.6%, which is 18.4% higher than plasma without catalyst. When the applied voltage is 30 kV, the gas flow rate is 1L/min, and the O2 ratio is 1%, the plasma combined with TiO2 catalyst treats the sample for 5 minutes, and the degradation efficiency of TIA can reach 97%. It could be concluded that the higher applied voltage and longer processing times leads to more degradation, but also results in a lower energy efficiency. Besides, decreasing the O2 ratio and gas flow rate could improve the degradation efficiency. The relative distribution and identity of major TIA degradant generated was determined by UPLC-MS analysis. The mechanism of TIA removal by plasma and TiO2 catalyst was analyzed, and the possible path of degradation was discussed.

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Novel formation of large area N-TiO2/graphene layered materials and enhanced photocatalytic degradation of antibiotics

Cited by 36 publications

References 25 publications

Enhanced Antibacterial Activity of Silver Doped Titanium Dioxide-Chitosan Composites under Visible Light

Enhanced Antibacterial Activity of Silver Doped Titanium Dioxide-Chitosan Composites under Visible Light

Improving the photocatalytic activity of nitrogen-doped surface defect TiO_2-x nanobelts for degradation of organic pollutants

Degradation of tiamulin by a packed bed dielectric barrier plasma combined with TiO₂ catalyst

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Novel formation of large area N-TiO2/graphene layered materials and enhanced photocatalytic degradation of antibiotics

Cited by 36 publications

References 25 publications

Enhanced Antibacterial Activity of Silver Doped Titanium Dioxide-Chitosan Composites under Visible Light

Enhanced Antibacterial Activity of Silver Doped Titanium Dioxide-Chitosan Composites under Visible Light

Improving the photocatalytic activity of nitrogen-doped surface defect TiO2-x nanobelts for degradation of organic pollutants

Degradation of tiamulin by a packed bed dielectric barrier plasma combined with TiO2 catalyst

Contact Info

Product

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Improving the photocatalytic activity of nitrogen-doped surface defect TiO_2-x nanobelts for degradation of organic pollutants

Degradation of tiamulin by a packed bed dielectric barrier plasma combined with TiO₂ catalyst