Synthesis of Ag2S–TiO2 nanocomposites and their catalytic activity towards rhodamine B photodegradation

Yadav, Sudheer Kumar; Jeevanandam, P.

doi:10.1016/j.jallcom.2015.07.184

Cited by 48 publications

(11 citation statements)

References 38 publications

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“…After the TiO 2 NTAs are sensitized by Ag 2 S QDs, the photogenerated current densities of Ag 2 S(8)/TiO 2 photoanode obviously increase to about 1.5 mA cm −2 . This may be attributed to the absorption of visible light by the Ag 2 S QDs [24]. In addition, the photoinduced current density of In 2 S 3 (9)/TiO 2 photoanode is not significantly enhanced (about 490 μA cm −2 ), which is much smaller than that of the Ag 2 S/TiO 2 NTAs photoanode.…”

Section: Optical and Photoelectrochemical Properties Analysismentioning

confidence: 89%

“…At the same time, Ag 2 S can be well matched with the conduction band (CB) and valence band (VB) of TiO 2 , which is conducive to the transport of photogenerated electrons and holes. Yadav et al studied the preparation of Ag 2 S-TiO 2 composites and its catalytic performance for photodegradation of rhodamine B [24]. Ag 2 S could exist in the form of quantum dots (QDs), and QDs have unique properties of tunable energy gap via controlling their sizes and high extinction coefficient [25,26].…”

Section: Introductionmentioning

confidence: 99%

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A highly efficient In₂S₃/Ag₂S/TiO₂ NTAs photoelectrodes for photocathodic protection of Q235 carbon steel under visible light

Li¹,

Yang²,

Cui³

et al. 2022

Nanotechnology

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A novel In2S3/Ag2S/TiO2 nanotube arrays (NTAs) was successfully fabricated by successive ionic layer adsorption and reaction (SILAR) method and electrochemical anodic oxidation method, and served as photoanode for photocathodic protection application. The micromorphologies, optical absorption properties, crystalline structure and elemental valence states of the composites were performed by field emission scanning electron microscopy, high resolution transmission electron microscope, UV−vis diffuse reflectance absorption spectra, X-ray diffractometer and X-ray photoelectron spectroscopy, respectively. The photocathodic protection performances of In2S3/Ag2S/TiO2 NTAs on the Q235 carbon steel (CS) were also studied. The In2S3/Ag2S/TiO2 nanocomposites show better photoelectrocatalytic and photocathodic protection performance than pure TiO2 NTAs. The photocurrent density of In2S3(9)/Ag2S(8)/TiO2 photoelectrode coupled with Q235 CS reach 211 μA cm−2, which is about 4.5 times higher than that of TiO2 NTAs. The photogenerated potential of Q235 CS coupled to In2S3(9)/Ag2S(8)/TiO2 under illumination shows a negative shift to −0.92 V vs. SCE. Results indicate that the co-sensitization of In2S3 and Ag2S could extend the light absorption of TiO2 to the visible light range and enhance its photoelectric conversion efficiency.microscope, UV−vis diffuse reflectance absorption spectra, X-ray diffractometer and X-ray photoelectron spectroscopy, respectively. The photocathodic protection performances of In2S3/Ag2S/TiO2 NTAs on the Q235 carbon steel (CS) were also studied. The In2S3/Ag2S/TiO2 nanocomposites show better photoelectrocatalytic and photocathodic protection performance than pure TiO2 NTAs. The photocurrent density of In2S3(9)/Ag2S(8)/TiO2 photoelectrode coupled with Q235 CS reach 211 μA cm−2, which is about 4.5 times higher than that of TiO2 NTAs. The photogenerated potential of Q235 CS coupled to In2S3(9)/Ag2S(8)/TiO2 under illumination shows a negative shift to −0.92 V vs. SCE. Results indicate that the co-sensitization of In2S3 and Ag2S could extend the light absorption of TiO2 to the visible light range and enhance its photoelectric conversion efficiency.

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Section: Optical and Photoelectrochemical Properties Analysismentioning

confidence: 89%

Section: Introductionmentioning

confidence: 99%

A highly efficient In₂S₃/Ag₂S/TiO₂ NTAs photoelectrodes for photocathodic protection of Q235 carbon steel under visible light

Li¹,

Yang²,

Cui³

et al. 2022

Nanotechnology

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“…Figure 2g, h is the TEM images of Ag0.1, which shows that small particles of TiO 2 and large particles of Ag 2 S are loaded on PVDF fibers. Figure 2i, the lattice fringes analysis of HRTEM, shows that d = 0.35 nm, 0.29 nm, and 0.31 nm correspond to (101) crystallographic planes of TiO 2 , (-112) and (111) of Ag 2 S, respectively [30,31]. The above analysis demonstrated that the Ag 2 S and TiO 2 have been deposited on the surface of PVDF fibers, and Ag 2 S/TiO 2 composite fibers membrane have been successfully synthesized.…”

Section: Morphology Analysismentioning

confidence: 99%

Efficient under visible catalysts from electrospun flexible Ag2S/TiO2 composite fiber membrane

Dong

et al. 2021

J Mater Sci

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The issue of antibiotic residue and contamination has attracted significant attention. Most of the existing degradation methods are inefficient and costly. Photocatalytic technology is an up-and-coming method. Titanium dioxide (TiO 2 ) is a photocatalyst widely used to degrade the residual antibiotics in water under ultraviolet (UV) irradiation. However, its application efficiency under visible light is poor, owing to its wide bandgap. This paper reports the successful synthesis of Ag 2 S/TiO 2 composite nanofiber membranes through electrospinning and hydrothermal processes, and adsorption and photocatalytic removal of tetracycline (TC) under visible light irradiation. Ag 2 S/TiO 2 showed excellent photocatalytic property for TC degradation compared with Ag 2 S and TiO 2 , and the efficiency was up to 70.54%. It kept high photocatalytic performance after five cycles. The detailed mechanism of TC degradation by Ag 2 S/ TiO 2 was also proposed based on the radical trapping experiment and the analysis of degradation intermediates. Benefiting from the large surface area, effective photocatalysis under visible light irradiation, and excellent recyclability, Ag 2 S/TiO 2 composite fiber membranes are promising in the treatment of antibiotic wastewater.

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“…To overcome these defects, TiO 2 nanotube arrays with large specific surface areas were synthesized [14–16] and various strategies were developed to expand its absorption to the visible light range. These strategies include coupling with narrow-bandgap semiconductors (ZnSe, WO 3 , SnO 2 , CdS, and Ag 2 S) [17–21], metals (Ag, Au, Cu, and Bi) [22–24], and nonmetals (N, F, and graphene) [25–27]. Bi 2 S 3 is an attractive material because of its narrow bandgap ( E g = 1.3 eV) and high photo-to-electron conversion efficiency [28].…”

Section: Introductionmentioning

confidence: 99%

Photocathodic Protection of 304 Stainless Steel by Bi2S3/TiO2 Nanotube Films Under Visible Light

Wang

Wei

et al. 2017

Nanoscale Res Lett

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We report the preparation of TiO2 nanotubes coupled with a narrow bandgap semiconductor, i.e., Bi2S3, to improve the photocathodic protection property of TiO2 for metals under visible light. Bi2S3/TiO2 nanotube films were successfully synthesized using the successive ionic layer adsorption and reaction (SILAR) method. The morphology and structure of the composite films were studied by scanning electron microscopy and X-ray diffraction, respectively. UV–visible diffuse reflectance spectra were recorded to analyze the optical absorption property of the composite films. In addition, the influence of Bi2S3 deposition cycles on the photoelectrochemical and photocathodic protection properties of the composite films was also studied. Results revealed that the heterostructure comprised crystalline anatase TiO2 and orthorhombic Bi2S3 and exhibited a high visible light response. The photocurrent density of Bi2S3/TiO2 was significantly higher than that of pure TiO2 under visible light. The sensitization of Bi2S3 enhanced the separation efficiency of the photogenerated charges and photocathodic protection properties of TiO2. The Bi2S3/TiO2 nanotubes prepared by SILAR deposition with 20 cycles exhibited the optimal photogenerated cathodic protection performance on the 304 stainless steel under visible light.

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Synthesis of Ag2S–TiO2 nanocomposites and their catalytic activity towards rhodamine B photodegradation

Cited by 48 publications

References 38 publications

A highly efficient In₂S₃/Ag₂S/TiO₂ NTAs photoelectrodes for photocathodic protection of Q235 carbon steel under visible light

A highly efficient In₂S₃/Ag₂S/TiO₂ NTAs photoelectrodes for photocathodic protection of Q235 carbon steel under visible light

Efficient under visible catalysts from electrospun flexible Ag2S/TiO2 composite fiber membrane

Photocathodic Protection of 304 Stainless Steel by Bi2S3/TiO2 Nanotube Films Under Visible Light

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Synthesis of Ag2S–TiO2 nanocomposites and their catalytic activity towards rhodamine B photodegradation

Cited by 48 publications

References 38 publications

A highly efficient In2S3/Ag2S/TiO2 NTAs photoelectrodes for photocathodic protection of Q235 carbon steel under visible light

A highly efficient In2S3/Ag2S/TiO2 NTAs photoelectrodes for photocathodic protection of Q235 carbon steel under visible light

Efficient under visible catalysts from electrospun flexible Ag2S/TiO2 composite fiber membrane

Photocathodic Protection of 304 Stainless Steel by Bi2S3/TiO2 Nanotube Films Under Visible Light

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A highly efficient In₂S₃/Ag₂S/TiO₂ NTAs photoelectrodes for photocathodic protection of Q235 carbon steel under visible light

A highly efficient In₂S₃/Ag₂S/TiO₂ NTAs photoelectrodes for photocathodic protection of Q235 carbon steel under visible light