scholarly journals Synthesis and Characterisation of Photocatalyst Silver/Silver Halide Nanocomposites

2021 ◽  
Author(s):  
◽  
Eldon Warwick Tate
Keyword(s):  
Photocatalytic Activity ◽  
Silver Halide ◽  
Synthesis Method ◽  
Photochemical Activity ◽  
Silver Halides ◽  
Porous Support ◽  
Aqueous Synthesis ◽  
Support Materials ◽  
Agcl Nanoparticles ◽  
Silver Silver

<p>The photochemical activity of silver halides forms the basis of photography and latent image formation. More recently it has been used to create hybrid silver/silver halide nanoparticles. These are formed through partial reduction of Ag⁺ to Ag⁰ by a photochemical self-sensitisation when irradiated with light. This gives the silver/silver halide nanoparticles interesting photocatalytic properties. As such, these silver/silver halide nanoparticles have seen to be part of group of photocatalysts known as plasmonic photocatalysts. Where, the photocatalytic mechanism is enhanced by the surface plasmon resonance of noble metal nanodomains on the surface of the silver halide nanoparticle. The silver/silver halide nanoparticles of Cl⁻, Br⁻ and I⁻ were synthesised and characterised. Silver/silver halide nanoparticles were then incorporated into porous support materials creating silver/silver halide nanocomposite materials. This was through a straight forward aqueous synthesis method, where silver halide nanoparticles precipitated from solution, and nanoparticle size, shape and stabilisation was controlled by the porous support material. Silver/silver halide nanocomposite samples using Cl⁻, Br⁻ and I⁻ were synthesised using wool fibres, kraft paper fibres and nanostructured calcium silicate as supports. UV/Vis and XRD showed Ag⁰ nanodomains were formed during the self-sensitisation process. SEM showed the morphology of the nanocomposites and that the nanoparticles were distributed within the nanocomposite matrix, not deposited on the surface. Preliminary photocatalytic activity of Ag/AgCl nanoparticles and nanocomposites was evaluated through the degradation of methylene blue when irradiated with light. All samples showed increased photocatalytic activity with the Ag/AgCl nanoparticles.</p>

scholarly journals Synthesis and Characterisation of Photocatalyst Silver/Silver Halide Nanocomposites

2021 ◽  
Author(s):  
◽  
Eldon Warwick Tate
Keyword(s):  
Photocatalytic Activity ◽  
Silver Halide ◽  
Synthesis Method ◽  
Photochemical Activity ◽  
Silver Halides ◽  
Porous Support ◽  
Aqueous Synthesis ◽  
Support Materials ◽  
Agcl Nanoparticles ◽  
Silver Silver

<p>The photochemical activity of silver halides forms the basis of photography and latent image formation. More recently it has been used to create hybrid silver/silver halide nanoparticles. These are formed through partial reduction of Ag⁺ to Ag⁰ by a photochemical self-sensitisation when irradiated with light. This gives the silver/silver halide nanoparticles interesting photocatalytic properties. As such, these silver/silver halide nanoparticles have seen to be part of group of photocatalysts known as plasmonic photocatalysts. Where, the photocatalytic mechanism is enhanced by the surface plasmon resonance of noble metal nanodomains on the surface of the silver halide nanoparticle. The silver/silver halide nanoparticles of Cl⁻, Br⁻ and I⁻ were synthesised and characterised. Silver/silver halide nanoparticles were then incorporated into porous support materials creating silver/silver halide nanocomposite materials. This was through a straight forward aqueous synthesis method, where silver halide nanoparticles precipitated from solution, and nanoparticle size, shape and stabilisation was controlled by the porous support material. Silver/silver halide nanocomposite samples using Cl⁻, Br⁻ and I⁻ were synthesised using wool fibres, kraft paper fibres and nanostructured calcium silicate as supports. UV/Vis and XRD showed Ag⁰ nanodomains were formed during the self-sensitisation process. SEM showed the morphology of the nanocomposites and that the nanoparticles were distributed within the nanocomposite matrix, not deposited on the surface. Preliminary photocatalytic activity of Ag/AgCl nanoparticles and nanocomposites was evaluated through the degradation of methylene blue when irradiated with light. All samples showed increased photocatalytic activity with the Ag/AgCl nanoparticles.</p>

Plasmonic silver incorporated silver halides for efficient photocatalysis

2016 ◽  
Vol 4 (12) ◽  
pp. 4336-4352 ◽  
Author(s):  
Changhua An ◽  
Shutao Wang ◽  
Yugang Sun ◽  
Qinhui Zhang ◽  
Jun Zhang ◽  
...  
Keyword(s):  
State Of The Art ◽  
Silver Halide ◽  
The State ◽  
Environmental Applications ◽  
Silver Halides ◽  
Fundamental Understanding ◽  
Silver Silver

The review provides an overall survey on the state-of-the-art silver–silver halide-based photocatalysts, fundamental understanding of their plasmonically induced photo-reactions and their major environmental applications.

The effects of solvent viscosity on the morphology and photocatalytic activity of BiOBr catalysts

2021 ◽  
Author(s):  
Fengjuan Ge ◽  
Jie Zhu ◽  
Yan Xu ◽  
Jing Li ◽  
Xueyang Zhang
Keyword(s):  
Photocatalytic Activity ◽  
Surface Area ◽  
Rhodamine B ◽  
Synthesis Method ◽  
Degradation Process ◽  
High Viscosity ◽  
Precipitation Method ◽  
Glycerol Solution ◽  
Solvent Viscosity ◽  
Degradation Tests

BiOBr photocatalysts were prepared by changing the solvent and synthesis method. SEM, XRD and BET characterization shows that the sample prepared in high-viscosity solution by precipitation method has tremella-like microstructure, with smaller size and higher surface area. Among them, the BiOBr prepared in glycerol solution (GR-P) has the highest surface area of 113.8 m2⋅[Formula: see text]. XRD also indicates that the GR-P has much more exposed (110) facets than other samples. The Rhodamine B degradation tests show that the GR-P has the best activity on both deethylation and aromatic ring destruction steps, indicating that the exposed (110) facets promote the degradation process.

scholarly journals Novel Synthesis Method of Sheet-like Agglomerates β-Bi2O3 with High Photocatalytic Activity

2018 ◽  
Vol 33 (8) ◽  
pp. 919 ◽  
Author(s):  
CHEN Jun ◽  
ZHAN Jing ◽  
DING Feng-Hua ◽  
LI Qi-Hou ◽  
TANG Yi-Wei
Keyword(s):  
Photocatalytic Activity ◽  
Synthesis Method ◽  
High Photocatalytic Activity ◽  
Novel Synthesis

scholarly journals Photo-conductance phenomena in the silver halides, and the latent photographic image.―Introduction and Part I

1930 ◽  
Vol 127 (806) ◽  
pp. 613-628 ◽  
Keyword(s):  
Silver Halide ◽  
Metallic Silver ◽  
Direct Part ◽  
Silver Halides ◽  
Photographic Image ◽  
Silver Salts ◽  
Absorption Of Light ◽  
Photographic Emulsions

In studying the mechanism of the photographic process the question naturally arises as to the part played by the silver halides, which form the basis of practically all photographic emulsions. It becomes important to determine whether, or not, the photographic mechanism can be linked up with one or more particular characteristics of these silver salts. Especially is this so in view of the fact that some investigators have developed theories in which the silver halides play no direct part in the photo-reaction taking place on exposure. They have assumed that the absorption of the active light and the resulting process occurs in other light sensitive substances associated with the silver halides in the emulsions, and that the function of the silver halide is merely to act as a source from which metallic silver is produced by the process of development. Weigert especially supports this idea at the present time. It seems to us, however, that the evidence which now exists is not only strongly against this view, but is in favour of the idea that the primary photographic process is intimately concerned with the absorption of light by the silver halides themselves, and may indeed be identified with certain of their characteristic properties.

Photocatalytically Active Cotton Fabrics Produced with Anatase Synthesized Using a Low-Temperature Sol-Gel Process

2018 ◽  
Vol 762 ◽  
pp. 408-412
Author(s):  
Raivis Eglītis ◽  
Gundars Mežinskis
Keyword(s):  
Photocatalytic Activity ◽  
Uv Light ◽  
Sol Gel ◽  
Average Particle Size ◽  
Synthesis Method ◽  
Average Particle ◽  
X Ray Diffraction ◽  
Sol Gel Process ◽  
Anatase Nanoparticles ◽  
Pre Treatment

In this work two different hydrosols were used to impregnate a commercially available cotton fabric with anatase nanoparticles to give it photocatalytic activity. To increase the activity, different pre-treatment methods were applied. The nanoparticle size was determined using dynamic light scattering and x-ray diffraction and the fabrics were examined using scanning electron microscopy. Photocatalytic activity was measured using the degradation of methyl-orange while irradiating the samples with UV light. The synthesis method allowed to produce anatase with an average particle size of 32 to 37 nm depending on the synthesis method used.

Sign in / Sign up

Export Citation Format

Share Document