Remarkably enhanced photocatalytic activity by sulfur-doped titanium dioxide in nanohybrids with carbon nanotubes

Khang, Nguyen Cao; Van, Duong Quoc; Thủy, Nguyễn Minh; Minh, Nguyễn Văn; Minh, Phan Ngoc

doi:10.1016/j.jpcs.2016.06.011

Cited by 13 publications

(3 citation statements)

References 33 publications

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“…For comparison, the XRD patterns of commercial anatase TiO 2 (CTiO 2 ) and pristine CNTs are also presented. The two characteristic peaks of the CNTs, centered at 2 θ angles of 25.28° and 44.27°, are indexed to their (002) and (100) crystal planes, respectively 26 . The first broad peak corresponds to interlayer stacking, and the second, weaker peak is attributed to the interplanar stacking of aromatic systems.…”

Section: Resultsmentioning

confidence: 99%

Selective growth of Ti3+/TiO2/CNT and Ti3+/TiO2/C nanocomposite for enhanced visible-light utilization to degrade organic pollutants by lowering TiO2-bandgap

Akter

Hanif

Islam

et al. 2021

Sci Rep

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A convenient route was developed for the selective preparation of two stable nanocomposites, Ti3+/TiO2/CNT (labeled as TTOC-1 and TTOC-3) and Ti3+/TiO2/carbon layer (labeled as TTOC-2), from the same precursor by varying the amount of single-walled carbon nanotubes used in the synthesis. TiO2 is an effective photocatalyst; however, its wide bandgap limits its usefulness to the UV region. As a solution to this problem, our prepared nanocomposites exhibit a small bandgap and wide visible-light (VL) absorption because of the introduction of carbonaceous species and Ti3+ vacancies. The photocatalytic efficiency of the nanocomposites was examined via the degradation of methylene blue dye under VL. Excellent photocatalytic activity of 83%, 98%, and 93% was observed for TTOC-1, TTOC-2, and TTOC-3 nanocomposites within 25 min. In addition, the photocatalytic degradation efficiency of TTOC-2 toward methyl orange, phenol, rhodamine B, and congo red was 28%, 69%, 71%, and 91%, respectively, under similar experimental conditions after 25 min. Higher reusability and structural integrity of the as-synthesized photocatalyst were confirmed within five consecutive runs by photocatalytic test and X-ray diffraction analysis, respectively. The resulting nanocomposites provide new insights into the development of VL-active and stable photocatalysts with high efficiencies.

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Section: Resultsmentioning

confidence: 99%

Selective growth of Ti3+/TiO2/CNT and Ti3+/TiO2/C nanocomposite for enhanced visible-light utilization to degrade organic pollutants by lowering TiO2-bandgap

Akter

Hanif

Islam

et al. 2021

Sci Rep

View full text Add to dashboard Cite

show abstract

“…For comparison, the XRD patterns of commercial anatase TiO 2 (CTiO 2 ) and pristine CNTs are also presented. The two characteristic peaks of the CNTs, centered at 2θ angles of 25.28° and 44.27°, are indexed to their (002) and (100) crystal planes, respectively 20 . The rst broad peak corresponds to interlayer stacking, and the second, weaker peak is attributed to the interplanar stacking of aromatic systems.…”

Section: Resultsmentioning

confidence: 99%

Selective growth of Ti3+/TiO2/CNT and Ti3+/TiO2/C nanocomposite photocatalysts for enhanced visible-light utilization to degrade organic pollutants by lowering the bandgap of TiO2

Akter

Hanif

Islam

et al. 2021

Preprint

View full text Add to dashboard Cite

A convenient route was developed for the selective preparation of two stable nanocomposites, Ti3+/TiO2/CNT (labeled as TTOC-1 and TTOC-3) and Ti3+/TiO2/carbon layer (labeled as TTOC-2), from the same precursor by varying the amount of single-walled carbon nanotubes used in the synthesis. TiO2 is an effective photocatalyst; however, its wide bandgap limits its usefulness to the UV region. As a solution to this problem, our prepared nanocomposites exhibit a small bandgap and wide visible-light (VL) absorption because of the introduction of carbonaceous species and Ti3+ vacancies. The photocatalytic efficiency of the nanocomposites was examined via the degradation of methylene blue dye under VL. Excellent photocatalytic activity of 83%, 98%, and 93% was observed for TTOC-1, TTOC-2, and TTOC-3 nanocomposites within 25 min. In addition, the photocatalytic degradation efficiency of TTOC-2 toward rhodamine B was 71% and for methyl orange (MO) dye was 28% under similar experimental conditions, after 25 min. Higher reusability and structural integrity of the as-synthesized photocatalyst were confirmed within five consecutive runs by photocatalytic test and X-ray diffraction analysis, respectively. The resulting nanocomposites provide new insights into the development of VL-active and stable photocatalysts with high efficiencies.

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“…13,14 Metal doping and nonmetal doping are still two main methods to enhance the photocatalytic efficiency of TiO 2 . [15][16][17] Doping a new element into TiO 2 may change the electron density of states, thereby reducing the bandgap. Additionally, doping of transition metals into TiO 2 can induce magnetic properties in this material, facilitating its collection by a magnetic field after use in photocatalytic applications.…”

Section: Introductionmentioning

confidence: 99%

Magnetic Ni-Doped TiO2 Photocatalysts for Disinfection of Escherichia coli Bacteria

Nguyen

Duong

et al. 2021

Journal of Elec Materi

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Ni-doped TiO 2 nanoparticles have been synthesized by a modified sol-gel method. The crystal phase composition, particle size, and magnetic and optical properties of the samples were comprehensively examined using x-ray diffraction analysis, transmission electron microscopy, Brunauer-Emmett-Teller surface area analysis, Raman spectroscopy, magnetization measurements, and ultraviolet-visible (UV-Vis) absorption techniques. The results showed that the prepared Ni-doped TiO 2 samples sintered at 400°C crystallized completely in anatase phase with average particle size in the range from 8 nm to 10 nm and presented broad visible absorption. The bactericidal efficiency of TiO 2 was effectively enhanced by Ni doping, with an optimum Ni doping concentration of 6% (x = 0.06), at which 95% of Escherichia coli were killed after just 90 min of irradiation. Density functional theory (DFT) calculations revealed good agreement with the experimental data. Moreover, the Ni dopant induced magnetic properties in TiO 2 , facilitating its retrieval using a magnetic field after use, which is an important feature for photocatalytic applications.

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Remarkably enhanced photocatalytic activity by sulfur-doped titanium dioxide in nanohybrids with carbon nanotubes

Cited by 13 publications

References 33 publications

Selective growth of Ti3+/TiO2/CNT and Ti3+/TiO2/C nanocomposite for enhanced visible-light utilization to degrade organic pollutants by lowering TiO2-bandgap

Selective growth of Ti3+/TiO2/CNT and Ti3+/TiO2/C nanocomposite for enhanced visible-light utilization to degrade organic pollutants by lowering TiO2-bandgap

Selective growth of Ti3+/TiO2/CNT and Ti3+/TiO2/C nanocomposite photocatalysts for enhanced visible-light utilization to degrade organic pollutants by lowering the bandgap of TiO2

Magnetic Ni-Doped TiO2 Photocatalysts for Disinfection of Escherichia coli Bacteria

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