Highly Visible Light Activity of Nitrogen Doped TiO2 Prepared by Sol–Gel Approach

Than, Le Dien; Luong, Ngo Sy; Ngo, Vu Dinh; Tien, Nguyen Manh; Dung, Ta Ngoc; Nghĩa, Nguyễn Mạnh; Loc, Nguyen Thai; Thu, Vũ Thị Hạnh; Лам, Тран Дай

doi:10.1007/s11664-016-4894-6

Cited by 27 publications

(8 citation statements)

References 21 publications

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“…A smaller bandgap (Eg 2.90 eV) was obtained in TiO 2 samples co-doped with C and N (TiO 2 -C,N 1:10%, TiO 2 -C,N 5:20%, particularly) in comparison to samples with a single dopant, C or N. Since the Eg changes, the dopants integration in the material modifications can be verified from previous works where authors showed that the incorporation of dopants reduces the Eg and it depends on the amount and type of the dopant [24]. Kim et al [25] reported that N content is inversely proportional to the Eg values, while higher N doping content is incorporated into the TiO 2 , the lower is the value of Eg, although it is also dependent on the calcination temperature.…”

Section: Synthesis and Characterization Of Powder Photocatalystssupporting

confidence: 60%

“…In the case of C-TiO 2 , the Eg was not modified by doping content. The bandgap change is due to the material modifications (doping) [24][25][26]. The C-N codoped TiO 2 catalysts allows holes to be located just above the valence band, which inhibits the electrons recombination [5,6] creating interband states.…”

Section: Synthesis and Characterization Of Powder Photocatalystsmentioning

confidence: 99%

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Water Disinfection Using Chitosan Microbeads With N-, C-, C-N/TiO2 By Photocatalysis Under Visible Light

et al. 2020

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Chitosan microbeads with C-doped TiO 2 , N-doped TiO 2 and C,N-codoped TiO 2 were prepared to obtain photocatalysts with higher photocatalytic efficiency, active under visible light and easy to removed from aqueous medium. TiO 2 powders were synthesized by the sol-gel method and modified using glucose and ammonium nitrate as source of C and N, respectively. Scanning electron microscope (SEM), X-ray diffraction (XRD), DRUV-Vis spectra and Raman techniques, were used to characterize the modified TiO 2 powders. The structural and physicochemical properties of the microbeads were analyzed by nitrogen physisorption, functional groups were identified by Fourier transform Infrared (FT-IR) spectroscopy and microbeads were observed by optical microscopy. The microbeads photocatalytic efficiency under visible light was evaluated monitoring the E. coli growth-inhibition, determined by colony count analysis (CFU-colony forming units). Results showed effectiveness in all tested composites to inhibit E. coli growth in 24 h under visible light. Furthermore chitosan microbeads with C,N-codoped TiO 2 showed the best performance in the degradation test being the most effective composite to achieving 99.99% of E. coli growth inhibition in less than 4 h.

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Section: Synthesis and Characterization Of Powder Photocatalystssupporting

confidence: 60%

Section: Synthesis and Characterization Of Powder Photocatalystsmentioning

confidence: 99%

Water Disinfection Using Chitosan Microbeads With N-, C-, C-N/TiO2 By Photocatalysis Under Visible Light

et al. 2020

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“…The binding energy positions of Ti 2p 1/2 and Ti 2p 3/2 can be found at approximately 464.0 and 458.3 eV respectively, being basically the same as that reported elsewhere [ 30 ]. This also indicates that, both before and after the sensitization of TiO 2 with Bi 2 O 3 , the oxidation state of the element Ti keeps the same, i.e., Ti 4+ , in the absence of Ti 3+ , and thus reveals the high purity of TiO 2 [ 31 ]. The broadening of the XPS peaks after the Bi 2 O 3 incorporation (0.05BiTNT vs. TNT) can be attributed to the electron transfer interactions between the matrix TiO 2 and the sensitizer Bi 2 O 3 [ 32 ].…”

Section: Resultsmentioning

confidence: 99%

Improving Visible Light-Absorptivity and Photoelectric Conversion Efficiency of a TiO2 Nanotube Anode Film by Sensitization with Bi2O3 Nanoparticles

Chang

Zhang

et al. 2017

Nanomaterials

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This study presents a novel visible light-active TiO2 nanotube anode film by sensitization with Bi2O3 nanoparticles. The uniform incorporation of Bi2O3 contributes to largely enhancing the solar light absorption and photoelectric conversion efficiency of TiO2 nanotubes. Due to the energy level difference between Bi2O3 and TiO2, the built-in electric field is suggested to be formed in the Bi2O3 sensitized TiO2 hybrid, which effectively separates the photo-generated electron-hole pairs and hence improves the photocatalytic activity. It is also found that the photoelectric conversion efficiency of Bi2O3 sensitized TiO2 nanotubes is not in direct proportion with the content of the sensitizer, Bi2O3, which should be carefully controlled to realize excellent photoelectrical properties. With a narrower energy band gap relative to TiO2, the sensitizer Bi2O3 can efficiently harvest the solar energy to generate electrons and holes, while TiO2 collects and transports the charge carriers. The new-type visible light-sensitive photocatalyst presented in this paper will shed light on sensitizing many other wide-band-gap semiconductors for improving solar photocatalysis, and on understanding the visible light-driven photocatalysis through narrow-band-gap semiconductor coupling.

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“…In recent years, nitrogen-doping TiO 2 (N-doped TiO 2 ) has gained intense interest due the broad absorption in the visible region the increased light absorption, hence efficient photoactivation by solar light. Previously, N-TiO 2 from calcined products of TiCl 4 in NH 4 OH was reported with photocatalytic high visible light activity which was ascribed to the interstitial nitrogen atoms within TiO 2 lattice units [10]. In another research, visible light active N-doped TiO 2 was prepared by mixing urea and TiO 2 powder under microwave irradiation.…”

Section: Introductionmentioning

confidence: 99%

Visible-Light Active Photocatalytic Dual Layer Hollow Fiber (DLHF) Membrane and Its Potential in Mitigating the Detrimental Effects of Bisphenol A in Water

et al. 2020

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The presence of bisphenol A (BPA) in various water sources has potentially led to numerous adverse effects in human such as increased in blood pressure and derangement in liver function. Thus, a reliable treatment for the removing BPA is highly required. This present work aimed to study the efficiency of visible light driven photocatalytic dual-layer hollow fiber (DLHF) membrane for the removal of BPA from water and further investigated its detrimental effects by using an in-vivo model. The prepared membranes were characterized for their morphology, particles distribution, surface roughness, crystallinity and light absorption spectra. The removal of 81.6% and 86.7% in BPA concentration was achieved for N-doped TiO2 DLHF after 360 min of visible and UV light irradiation, respectively. No significant changes for all three groups were observed in liver function test meanwhile the rats-exposed to untreated BPA water shows significance blood pressure increment contrary to rats-exposed to treated BPA water. Similarly, the normal morphology in both jejunum and ileum were altered in rats-exposed to untreated BPA water group. Altogether, the presence of N-doped TiO2 in DLHF are shown to significantly enhance the photocatalytic degradation activity under visible irradiation, which effectively mitigates the effect of BPA in an in-vivo model.

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Highly Visible Light Activity of Nitrogen Doped TiO2 Prepared by Sol–Gel Approach

Cited by 27 publications

References 21 publications

Water Disinfection Using Chitosan Microbeads With N-, C-, C-N/TiO2 By Photocatalysis Under Visible Light

Water Disinfection Using Chitosan Microbeads With N-, C-, C-N/TiO2 By Photocatalysis Under Visible Light

Improving Visible Light-Absorptivity and Photoelectric Conversion Efficiency of a TiO2 Nanotube Anode Film by Sensitization with Bi2O3 Nanoparticles

Visible-Light Active Photocatalytic Dual Layer Hollow Fiber (DLHF) Membrane and Its Potential in Mitigating the Detrimental Effects of Bisphenol A in Water

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