One-Step Synthesis of b-N-TiO2/C Nanocomposites with High Visible Light Photocatalytic Activity to Degrade Microcystis aeruginosa

Black TiO2 with doped nitrogen and modified carbon (b-N-TiO2/C) were successfully prepared by sol-gel method in the presence of urea as a source of nitrogen and carbon. The photocatalysts were characterized by field emission scanning electron microscopy (SEM), transmission electron microscopy (TEM), X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), Raman, electron paramagnetic resonance (EPR), and UV-vis diffuse reflectance spectra (DRS). The doped nitrogen, introduced defects, and modified carbon played a synergistic role in enhancing photocatalytic activity of b-N-TiO2/C for the degradation of chlorophyll-a in algae cells. The sample, with a proper amount of phase composition and oxygen vacancies, showed the highest efficiency to degrade chlorophyll-a, and the addition of H2O2 promoted this photocatalysis degradation. Based on the trapping experiments and electron spin resonance (ESR) signals, a photocatalytic mechanism of b-N-TiO2/C was proposed. In the photocatalytic degradation of chlorophyll-a, the major reactive species were identified as OH and O2−. This research may provide new insights into the photocatalytic inactivation of algae cells by composite photocatalysts.

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Activation of persulfate by heterogeneous catalyst ZnCo2O4–RGO for efficient degradation of bisphenol A

Canadian Journal of Chemistry ◽

10.1139/cjc-2020-0192 ◽

2020 ◽

Vol 98 (12) ◽

pp. 771-778

Author(s):

Xin Chang ◽

Xiangyang Xu ◽

Zhifeng Gao ◽

Yingrui Tao ◽

Yixuan Yin ◽

...

Keyword(s):

Electron Microscopy ◽

Bisphenol A ◽

Photoelectron Spectroscopy ◽

X Ray Diffraction ◽

Reaction Conditions ◽

X Ray ◽

Transmission Electron ◽

Nucleation Sites ◽

One Step ◽

Application Potential

A nanocomposite, reduced graphene oxide (RGO) modified ZnCo2O4 (ZnCo2O4–RGO) was synthesized via one-step solvothermal method for activating persulfate (PS) to degrade bisphenol A (BPA). The morphology and structure of the nanocomposite were identified by X-ray diffraction, Fourier transform infrared spectroscopy, X-ray photoelectron spectroscopy, scanning electron microscopy, and transmission electron microscopy. RGO provides nucleation sites for ZnCo2O4 to grow and inhibits the agglomeration of the nanoparticles. The influence of different reaction conditions on the oxidation of BPA catalyzed by ZnCo2O4–RGO was investigated, including the content of RGO, the dosage of catalyst, the concentration of humic acid (HA), anions in the environment, the reaction temperature, and pH. BPA can be totally degraded within 20 min under optimized reaction conditions. The presence of HA, Cl−, and NO3− only has a slight effect on the oxidation of BPA, whereas the presence of either H2PO4− or HCO3− can greatly inhibit the reaction. ZnCo2O4–RGO shows good cycling stability and practical application potential. A reaction mechanism of the degradation of BPA was also explored.

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Hydrothermal Synthesis and Photocatalytic Properties of Flower-Like CdS Nanostructures

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.335-336.460 ◽

2011 ◽

Vol 335-336 ◽

pp. 460-463 ◽

Cited By ~ 2

Author(s):

Hong Mei Wang ◽

Da Peng Zhou ◽

Yuan Lian ◽

Ming Pang ◽

Dan Liu

Keyword(s):

Electron Microscopy ◽

Photocatalytic Activity ◽

Photoelectron Spectroscopy ◽

Uv Light ◽

Sulfur Source ◽

X Ray Diffraction ◽

Facile Hydrothermal Method ◽

X Ray ◽

Transmission Electron ◽

Cds Nanostructures

Hexagonal flower-like CdS nanostructures were successfully synthesized through a facile hydrothermal method with thiourea as sulfur source. By combining the results of X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), field-emission scanning electron microscopy (FE-SEM), transmission electron microscopy (TEM), the structural and morphological characterizations of the products were performed. The photocatalytic activity of CdS nanostructures had been tested by degradation of Rhodamine B (RB) under UV light compared to commercial CdS powders, which indicated that the as-syntherized CdS nanostructures exhibited enhanced photocatalytic activity for degradation of RB. The possible growth mechanism of CdS nanostructures was proposed in the end.

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Preparation of g-C3N4/MoS2 Composite Material and Its Visible Light Catalytic Performance

10.21203/rs.3.rs-627855/v1 ◽

2021 ◽

Author(s):

Yu Fan ◽

Yan-ning Yang ◽

Chen Ding

Keyword(s):

Electron Microscopy ◽

Photocatalytic Activity ◽

Visible Light ◽

Photoelectron Spectroscopy ◽

Photogenerated Electron ◽

Catalytic Performance ◽

X Ray Diffraction ◽

X Ray ◽

Transmission Electron ◽

Calcination Method

Abstract The g-C3N4 nanosheet was prepared by calcination method, the MoS2 nanosheet was prepared by hydrothermal method. The g-C3N4/MoS2 composites were prepared by ultrasonic composite in anhydrous ethanol. X-ray diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM), X-ray photoelectron spectroscopy (XPS), ultraviolet-visible spectroscopy (UV-Vis), and photoluminescence (PL) techniques were used to characterize the materials. The photocatalytic degradation of Rhodamine B (Rh B) by g-C3N4/MoS2 composites with different mass ratios was investigated under visible light. The results show that a small amount of MoS2 combined with g-C3N4 can significantly improve photocatalytic activity. The g-C3N4/MoS2 composite with a mass ratio of 1:8 has the highest photocatalytic activity, and the degradation rate of Rh B increases from 50% to 99.6%. The main reason is that MoS2 and g-C3N4 have a matching band structure. The separation rate of photogenerated electron-hole pairs is enhanced. So the g-C3N4/MoS2 composite can improve the photocatalytic activity. The photocatalytic mechanism was proposed through the active matter capture experiment.

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Fabrication of g-C3N4/Y-TiO2 Z-scheme heterojunction photocatalysts for enhanced photocatalytic activity

New Journal of Chemistry ◽

10.1039/d1nj03691b ◽

2021 ◽

Author(s):

SongSik Pak ◽

KwangChol Ri ◽

Chenmin Xu ◽

Qiuyi Ji ◽

Dunyu Sun ◽

...

Keyword(s):

Electron Microscopy ◽

Scanning Electron Microscopy ◽

Fourier Transform ◽

Photocatalytic Activity ◽

Electron Microscope ◽

Photoelectron Spectroscopy ◽

X Ray Diffraction ◽

X Ray ◽

Transmission Electron ◽

Scanning Electron

The g-C3N4/Y-TiO2 Z-scheme heterojunction photocatalysts were successfully synthesized. The powder X-ray diffraction, scanning electron microscopy, high-resolution transmission electron microscope, Fourier transform infrared spectroscopy, and X-ray photoelectron spectroscopy were used for...

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Improved Visible Light Photocatalytic Activity for TiO2Nanomaterials by Codoping with Zinc and Sulfur

Journal of Nanomaterials ◽

10.1155/2015/157383 ◽

2015 ◽

Vol 2015 ◽

pp. 1-8 ◽

Cited By ~ 4

Author(s):

Qianzhi Xu ◽

Xiuying Wang ◽

Xiaoli Dong ◽

Chun Ma ◽

Xiufang Zhang ◽

...

Keyword(s):

Photocatalytic Activity ◽

Visible Light ◽

Photoelectron Spectroscopy ◽

Diffuse Reflectance Spectroscopy ◽

Sol Gel ◽

X Ray Diffraction ◽

Sunlight Irradiation ◽

X Ray ◽

Transmission Electron ◽

Photoinduced Charge

S/Zn codoped TiO2nanomaterials were synthesized by a sol-gel method. X-ray diffraction, UV-vis diffuse reflectance spectroscopy, transmission electron microscopy, photoluminescence spectroscopy, and X-ray photoelectron spectroscopy were used to characterize the morphology, structure, and optical properties of the prepared samples. The introduction of Zn and S resulted in significant red shift of absorption edge for TiO2-based nanomaterials. The photocatalytic activity was evaluated by degrading reactive brilliant red X-3B solution under simulated sunlight irradiation. The results showed S/Zn codoped TiO2exhibited higher photocatalytic activity than pure TiO2and commercial P25, due to the photosynergistic effect of obvious visible light absorption, efficient separation of photoinduced charge carriers, and large surface area. Moreover, the content of Zn and S in the composites played important roles in photocatalytic activity of TiO2-based nanomaterials.

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Photocatalytic Activity of Nickel Doped CoO Nanocomposite for the Degradation of Azure A Dye

Asian Journal of Chemistry ◽

10.14233/ajchem.2021.22996 ◽

2020 ◽

Vol 33 (1) ◽

pp. 240-244

Author(s):

Nirmal Singh ◽

Avinash Kumar Rai ◽

Ritu Vyas ◽

Rameshwar Ameta

Keyword(s):

Electron Microscopy ◽

Photocatalytic Activity ◽

Degradation Rate ◽

Dye Degradation ◽

Sol Gel ◽

X Ray Diffraction ◽

X Ray ◽

Azure A ◽

Transmission Electron ◽

Working Parameters

Nanocrystalline cobalt(II) oxide doped with nickel was prepared using the sol-gel method and employed as a photocatalyst for azure A dye degradation under visible light. The prepared photocatalyst was analyzed using energy-dispersive X-ray (EDX) spectroscopy, field emission scanning electron microscopy (FESEM), Fourier-transform infrared (FTIR), X-ray diffraction (XRD) and high-resolution transmission electron microscopy (HRTEM) techniques. The photocatalytic activity of Ni-doped CoO under different working parameters, like concentration, pH, dosage (Ni-doped and undoped CoO), light intensity for the degradation of azure A dye was also optimzed. It was observed that the dye degradation rate improved after doping. Approximately 76% and 85% of azure A dye was degraded within 90 min through undoped and Ni-doped CoO, respectively.

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Photocatalytic Performance of BiOCl Nanosheets Composite with Graphene

Applied Mechanics and Materials ◽

10.4028/www.scientific.net/amm.496-500.297 ◽

2014 ◽

Vol 496-500 ◽

pp. 297-300 ◽

Cited By ~ 1

Author(s):

Bi Tao Liu ◽

Liang Liang Tian ◽

Ling Ling Peng

Keyword(s):

Electron Microscopy ◽

Photocatalytic Activity ◽

Photocatalytic Performance ◽

Diffuse Reflectance Spectroscopy ◽

Hydrothermal Reaction ◽

X Ray Diffraction ◽

X Ray ◽

Transmission Electron ◽

One Step ◽

High Migration

A series of composites of the high photoactivity of {001} facets exposed BiOCl and grapheme sheets (GS) were synthesized via a one-step hydrothermal reaction. The obtained BiOCl/GS photocatalysts were characterized by X-ray diffraction (XRD), Raman spectroscopy, scanning electron microscopy, transmission electron microscopy (TEM), Ultraviolet-visible (UV-Vis) diffuse reflectance spectroscopy. The as-prepared BiOCl/GS photocatalyst showed enhanced photocatalytic activity for the degradation of methyl orange (MO) under UV and visible light (λ > 400 nm). The enhanced photocatalytic activity could be attributed to oxygen vacancies of the {001} facets of BiOCl/GS and the high migration efficiency of photo-induced electrons, which could suppress the charge recombination effectively.

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Characterization of Y/TiO2 Nanoparticles and their Reactivity for CO2 Photoreduction

Applied Mechanics and Materials ◽

10.4028/www.scientific.net/amm.55-57.1506 ◽

2011 ◽

Vol 55-57 ◽

pp. 1506-1510 ◽

Cited By ~ 3

Author(s):

Jing Wei ◽

Xin Tan ◽

Tao Yu ◽

Lin Zhao

Keyword(s):

Electron Microscopy ◽

Photoelectron Spectroscopy ◽

Sol Gel ◽

Chemical Properties ◽

X Ray Diffraction ◽

X Ray ◽

Uv Illumination ◽

Transmission Electron ◽

And Chemical Properties

A series of Y/TiO2nanoparticles (NPs) were synthesized via sol-gel method. The crystal structures, morphologies and chemical properties were characterized using X-ray diffraction (XRD), high resolution transmission electron microscopy (HR-TEM) and X-ray photoelectron spectroscopy (XPS). We investigated the effects of different doping amounts of Y on the reaction of CO2photoreduction. The results shown that 0.1 wt.%Y/TiO2(0.1YT) performed the highest photocatalytic activity, which yielded 384.62 µmol/g∙cat. formaldehyde after 6 h of UV illumination.

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Physical Characteristics of Titania Nanofibers Synthesized by Sol-Gel and Electrospinning Techniques

Journal of Engineered Fibers and Fabrics ◽

10.1177/155892501000500106 ◽

2010 ◽

Vol 5 (1) ◽

pp. 155892501000500 ◽

Cited By ~ 2

Author(s):

Soo-Jin Park ◽

Yong C. Kang ◽

Ju Y. Park ◽

Ed A. Evans ◽

Rex D. Ramsier ◽

...

Keyword(s):

Electron Microscopy ◽

Photoelectron Spectroscopy ◽

Sol Gel ◽

Average Diameter ◽

X Ray Diffraction ◽

X Ray ◽

Transmission Electron ◽

Vis Spectroscopy ◽

Ceramic Nanofibers ◽

Titania Nanofibers

Titania nanofibers were successfully synthesized by sol-gel coating of electrospun polymer nanofibers followed by calcining to form either the pure anatase or rutile phases. Characterization of these materials was carried out using scanning electron microscopy (SEM), transmission electron microscopy (TEM), diffuse reflectance Fourier transform infrared spectroscopy (DRIFTS), X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), and UV-vis spectroscopy techniques. The average diameter of these ceramic nanofibers was observed to be around 200 nm for both the rutile and anatase forms. The valence band structure and optical absorption thresholds differ, however, indicating that nanofibrous mats of titania can be selectively developed for different applications in catalysis and photochemistry.

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