Preparation of Ag-doped TiO2 nanoparticles by a miniemulsion method and their photoactivity in visible light illuminations

Li, Youji; Ma, Mingyuan; Chen, Wei; Li, Leiyong; Zen, Mengxiong

doi:10.1016/j.matchemphys.2011.04.055

Cited by 74 publications

(43 citation statements)

References 38 publications

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“…This finding suggests that the presence of Ag and Fe particles restrains the growth of TiO 2 and zeolite crystallites and prevents the phase transformation, by reducing the activation energy needed to promote the crystallization of anatase and zeolite on the surface. Similar results were also previously reported . The growth of the anatase particles is detrimentally affected also by the presence of the zeolite particles.…”

Section: Resultssupporting

confidence: 92%

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Photocatalytic Efficiency of Zeolite‐Based TiO₂ Composites for Reduction of Cu (II): Kinetic Models

Peter

Mihaly‐Cozmuta

et al. 2013

Int J Applied Ceramic Tech

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This study evaluates the photoactivity of novel zeolite‐based TiO2 composites modified with metal particles for the photoreduction of Cu2+, depending on the zeolite and metal particles (Ag or Fe) content and to establish the photoreduction mechanism. The composites have been prepared by incorporating zeolite particles in the sols during the sol‐gel preparation of the TiO2, followed by impregnation of the gels in solutions containing metal ions. The zeolite‐based TiO2 composites have been characterized using X‐ray diffraction, Raman and FTIR spectroscopy techniques and TEM microscopy. The role of zeolite particles in the photoreduction process was demonstrated by using different kinetic models. The apparent constant rate for photoreduction increases in direct proportion with the content of zeolite and is higher for the composites modified with Fe than for those modified with Ag nanoparticles. The results demonstrate that composites have a higher photocatalytic efficiency than TiO2. The experiments in this study reveal that the migration of Cu2+ in solution occurs rapidly and that the diffusion through the film on the composite's surface and, subsequently, the photoreduction process are the rate limiting steps. The role of the zeolite in photoreduction is to diminish the recombination rate of the charge carriers.

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Section: Resultssupporting

confidence: 92%

“…Similar results were also previously reported. 17,18 The growth of the anatase particles is detrimentally affected also by the presence of the zeolite particles. The content of the anatase crystalline phase in the composites containing 1% and 5% zeolite is higher than that from the composites containing 10% zeolite.…”

Section: Resultsmentioning

confidence: 99%

Photocatalytic Efficiency of Zeolite‐Based TiO₂ Composites for Reduction of Cu (II): Kinetic Models

Peter

Mihaly‐Cozmuta

et al. 2013

Int J Applied Ceramic Tech

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“…This method is simple and does not involve any stringent reaction conditions. This method is a good alternative for the reported costly instrumental procedures, the electrochemical methods using silver electrode, or the photo‐degradation methods using different catalysts like Ag–TiO 2 nanoparticles and inorganic–organic nanohybrid based on a copper(II) semicarbazone complex and the PMo 12 O 40 3‐ polyanion, elemental iron/MnO 2 system, Fe–fullerene/TiO 2 compounds, Ti–10Cr catalyst and the SCP [(ph 3 Sn) 4 Fe(CN) 6 ] …”

Section: Resultsmentioning

confidence: 99%

Crystal structure, characterization and catalytic activities of Cu(II) coordination complexes with 8‐hydroxyquinoline and pyrazine‐2‐carboxylic acid

Etaiw

El‐bendary

2017

Applied Organom Chemis

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Green and blue crystals of the coordination complexes [Cu(8-hquin) 2 (H 2 O) 2 ], 1 and [Cu(pyzca) 2 (H 2 O) 2 ], 2 were obtained by the reaction of copper chloride with 8-hydroxyquinoline (8-hquinH) or pyrazine-2-carboxylic acid (pyzcaH) as ligands. The structures of 1 and 2 were characterized by elemental analyses, electronic absorption, Infrared (IR) and thermal studies. The luminescent behavior complexes 1 and 2 was also discussed. The coordination environment of copper(II) center displays distorted octahedral coordination geometry. The structure of the complexes 1 and 2 is constructed by an infinite number of discrete mononuclear molecules extending along the a-axis to form a 1D-chain via H-bonds. The extensive hydrogen bonds and short contacts develop the structures of 1 and 2 to 3D-network. The catalytic behavior of the complexes 1 and 2 was utilized for degradation of methylene blue dye (MB). The kinetic data indicated that the complexes 1 and 2 are effective catalysts for degradation of MB dye. Photoluminescence probing technology was used as a sensitive probe for detecting • OH radicals.

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“…After 5 h of reaction, Ag(0.03)-doped Cd 0.1 Zn 0.9 S and Ag(0.05)-doped Cd 0.1 Zn 0.9 S even showed a lower rate than that obtained from the undoped Cd 0.1 Zn 0.9 S. The enhancement in the photocatalytic activity of Ag(0.01)-doped Cd 0.1 Zn 0.9 S might be attributed to the better crystallinity, the improved absorption in the visible-light region, as well as the presence of Ag species. Regarding the latter it has been proposed that both Ag 0 and Ag + played an important role in facilitating the charge separation and suppressing the recombination of photoexcited charge carries [18–19], while the Ag 2 S could also act as a hole-transfer catalyst [21,24] for the oxidation of sulfide ions, which in turn promoted the activity. As shown in the DR UV–vis spectra (Fig.…”

Section: Resultsmentioning

confidence: 99%

High activity of Ag-doped Cd_0.1Zn_0.9S photocatalyst prepared by the hydrothermal method for hydrogen production under visible-light irradiation

Yuliati¹,

Kimi²,

Shamsuddin³

2014

Beilstein J. Nanotechnol.

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Summary Background: The hydrothermal method was used as a new approach to prepare a series of Ag-doped Cd0.1Zn0.9S photocatalysts. The effect of Ag doping on the properties and photocatalytic activity of Cd0.1Zn0.9S was studied for the hydrogen production from water reduction under visible light irradiation. Results: Compared to the series prepared by the co-precipitation method, samples prepared by the hydrothermal method performed with a better photocatalytic activity. The sample with the optimum amount of Ag doping showed the highest hydrogen production rate of 3.91 mmol/h, which was 1.7 times higher than that of undoped Cd0.1Zn0.9S. With the Ag doping, a red shift in the optical response was observed, leading to a larger portion of the visible light absorption than that of without doping. In addition to the larger absorption in the visible-light region, the increase in photocatalytic activity of samples with Ag doping may also come from the Ag species facilitating electron–hole separation. Conclusion: This study demonstrated that Ag doping is a promising way to enhance the activity of Cd0.1Zn0.9S photocatalyst.

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Preparation of Ag-doped TiO2 nanoparticles by a miniemulsion method and their photoactivity in visible light illuminations

Cited by 74 publications

References 38 publications

Photocatalytic Efficiency of Zeolite‐Based TiO₂ Composites for Reduction of Cu (II): Kinetic Models

Photocatalytic Efficiency of Zeolite‐Based TiO₂ Composites for Reduction of Cu (II): Kinetic Models

Crystal structure, characterization and catalytic activities of Cu(II) coordination complexes with 8‐hydroxyquinoline and pyrazine‐2‐carboxylic acid

High activity of Ag-doped Cd_0.1Zn_0.9S photocatalyst prepared by the hydrothermal method for hydrogen production under visible-light irradiation

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Preparation of Ag-doped TiO2 nanoparticles by a miniemulsion method and their photoactivity in visible light illuminations

Cited by 74 publications

References 38 publications

Photocatalytic Efficiency of Zeolite‐Based TiO2 Composites for Reduction of Cu (II): Kinetic Models

Photocatalytic Efficiency of Zeolite‐Based TiO2 Composites for Reduction of Cu (II): Kinetic Models

Crystal structure, characterization and catalytic activities of Cu(II) coordination complexes with 8‐hydroxyquinoline and pyrazine‐2‐carboxylic acid

High activity of Ag-doped Cd0.1Zn0.9S photocatalyst prepared by the hydrothermal method for hydrogen production under visible-light irradiation

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Photocatalytic Efficiency of Zeolite‐Based TiO₂ Composites for Reduction of Cu (II): Kinetic Models

Photocatalytic Efficiency of Zeolite‐Based TiO₂ Composites for Reduction of Cu (II): Kinetic Models

High activity of Ag-doped Cd_0.1Zn_0.9S photocatalyst prepared by the hydrothermal method for hydrogen production under visible-light irradiation