High Performance Ag/AgBr/TiO2 Photocatalyst-Coated Silica Beads

2016 ◽  
Vol 690 ◽  
pp. 156-161
Author(s):  
Jate Panichpakdee ◽  
Nobuaki Negishi ◽  
Siriporn Larpkiattaworn
Keyword(s):  
Formic Acid ◽  
High Performance ◽  
Sol Gel ◽  
Molar Ratio ◽  
Photocatalytic Efficiency ◽  
Gel Method ◽  
Acid Degradation ◽  
Molar Ratios ◽  
Study Results ◽  
Silica Beads

A series of three-component photocatalyst consisting of Ag, AgBr, and TiO2 were synthesized and successfully coated on PSB-01 beads (TiO2-coated silica beads). Different Ag to Ti molar ratios of 0.07, 0.10, and 0.20 in ethanol were prepared and coated on PSB-01 beads by sol-gel method. The morphologies and elemental compositions of these photocatalysts were characterized by SEM, EDS, and XRD, respectively. The performance of the photocatalyst coated on PSB-01 beads was evaluated in aspects of efficiency and stability. As for the photocatalytic efficiency, formic acid was used as the chemical model in this study. Results showed that the deposition of Ag/AgBr/TiO2 at Ag/Ti molar ratio of 0.07 on PSB-01 beads had the best performance in terms of formic acid degradation when compared to other ratios of Ag/AgBr/TiO2-coated PSB-01, Ag-coated PSB-01, and PSB-01 beads. In addition, for the study of stability, the release of silver from a series of Ag/AgBr/TiO2-coated PSB-01 was also evaluated.

Sol-gel Synthesis of Li–ZrSiO4

2000 ◽  
Vol 15 (7) ◽  
pp. 1490-1495 ◽  
Author(s):  
Heriberto Pfeiffer ◽  
Pedro Bosch ◽  
Jose A. Odriozola ◽  
Alberto Lopez ◽  
Jorge A. Ascencio ◽  
...  
Keyword(s):  
Theoretical Analysis ◽  
Photoelectron Spectroscopy ◽  
Sol Gel ◽  
Molar Ratio ◽  
Spectroscopy Analysis ◽  
Gel Method ◽  
X Ray ◽  
Cell Parameters ◽  
Molar Ratios ◽  
Sol Gel Synthesis

Li–ZrSiO4 was synthesized by the sol-gel method. Reactions were performed with different Li:Zr molar ratios: 1, 3, 5, and 6. Cell parameters changed as follows: a0 decreased and c0 increased as the Li:Zr molar ratio increased. The x-ray photoelectron spectroscopy analysis showed two kinds of oxygen atoms. The first one was attributed to ZrSiO4 oxygens. The second one was attributed to Li–O bonds. All these results were supported by a theoretical analysis. It was concluded that lithium atoms were held in interstitial positions of the ZrSiO4 structure.

Fast response acetone-sensing properties of SnO2 nanoparticles prepared by the sol-gel method

2021 ◽  
Vol 93 (3) ◽  
pp. 30401
Author(s):  
Jiaxing Wang ◽  
Hai Yu ◽  
Yong Zhang
Keyword(s):  
High Performance ◽  
Gas Sensing ◽  
Sno2 Nanoparticles ◽  
Sol Gel ◽  
Fast Response ◽  
X Ray Diffraction ◽  
Gel Method ◽  
Sol Gel Method ◽  
Short Recovery Time ◽  
Acetone Gas Detection

SnO2 nanoparticle architectures were successfully synthesized using a sol-gel method and developed for acetone gas detection. The morphology and structure of the particles were characterized by X-ray diffraction (XRD) and scanning electron microscopy (SEM). The SnO2 nanoparticle architectures were configured as high-performance sensors to detect acetone and showed a very fast response time (<1 s), a short recovery time (10 s), good repeatability and high selectivity at a relatively low working temperature. Thus, SnO2 nanoparticles should be promising candidates for designing and fabricating acetone gas sensors with good gas sensing performance. The possible gas sensing mechanism is also presented.

Sol-gel synthesis and characterization of Ag nanoparticles in ZrO2 thin films

2009 ◽  
Vol 24 (8) ◽  
pp. 2541-2546 ◽  
Author(s):  
Eisuke Yokoyama ◽  
Hironobu Sakata ◽  
Moriaki Wakaki
Keyword(s):  
Thin Films ◽  
Sol Gel ◽  
Composite Films ◽  
Dip Coating ◽  
Molar Ratio ◽  
X Ray Diffraction ◽  
Silver Surface ◽  
Molar Ratios ◽  
Sol Gel Synthesis

ZrO2 thin films containing silver nanoparticles were prepared using the sol-gel method with Ag to Zr molar ratios [Ag]/[Zr] = 0.11, 0.25, 0.43, 0.67, 1.00, 1.50, and 2.33. After dip coating on glass substrate, coated films were annealed at 200 and 300 °C in air. X-ray diffraction peaks corresponding to crystalline Ag were observed, but a specific peak corresponding to ZrO2 was not observed. At the molar ratio [Ag]/[Zr] = 0.25, the particle size of Ag distributed broadly centered at 17 nm for an annealing temperature of 200 °C and at 25 nm for 300 °C. The films annealed in air at 200 °C showed an absorption band centered at 450 nm because of the silver surface plasmon resonance, whereas films heated at 300 °C in air caused a red shift of the absorption to 500 nm. The absorption peak was analyzed using the effective dielectric function of Ag-ZrO2 composite films modeled with the Maxwell-Garnett expression.

Mesoporous 3D network Ce-doped NiO nanoflakes as high performance electrodes for supercapacitor applications

2019 ◽  
Vol 43 (19) ◽  
pp. 7441-7456 ◽  
Author(s):  
P. E. Saranya ◽  
S. Selladurai
Keyword(s):  
High Performance ◽  
Sol Gel ◽  
Gel Method ◽  
Sol Gel Method ◽  
3D Network ◽  
Supercapacitor Applications

In the present study, pristine NiO- and Ce (0.5, 1.0, 1.5, and 2%)-doped NiO nanoflakes were synthesised using the sol–gel method for supercapacitor applications.

scholarly journals Photocatalytic Improvement under Visible Light inTiO2Nanoparticles by Carbon Nanotube Incorporation

2015 ◽  
Vol 2015 ◽  
pp. 1-10 ◽  
Author(s):  
Mathana Wongaree ◽  
Siriluk Chiarakorn ◽  
Surawut Chuangchote
Keyword(s):  
Photocatalytic Activity ◽  
Visible Light ◽  
Sol Gel ◽  
Multiwall Carbon Nanotubes ◽  
High Specific Surface Area ◽  
Molar Ratio ◽  
Molar Ratios ◽  
Calcination Temperatures ◽  
Photocatalytic Activities ◽  
Multiwall Carbon

Photocatalytic activity ofTiO2nanoparticles was successfully enhanced by addition of multiwall carbon nanotubes (MWCNT) to make CNT/TiO2nanocomposites by sol-gel method at ambient temperature. CNT treated by HNO3 : H2SO4treatment (1 : 3 v/v) was mixed withTiO2nanoparticles at various molar ratios and calcination temperatures. The optimal molar ratio of CNT : TiO2was found at 0.05 : 1 by weight. The optimal calcination condition was 400°C for 3 h. From the results, the photocatalytic activities of CNT/TiO2nanocomposites were determined by the decolorization of 1 × 10−5 M methylene blue (MB) under visible light. CNT/TiO2nanocomposites could enhance the photocatalytic activity and showed faster for the degradation of MB with only 90 min. The degradation efficiency of the MB solution with CNT/TiO2nanocomposite achieved 70% which was higher than that with pristineTiO2(22%). This could be explained that CNT preventsTiO2from its agglomeration which could further enhance electron transfer in the composites. In addition, CNT/TiO2nanocomposites had high specific surface area (202 m2/g) which is very promising for utilization as a photocatalyst for environmental applications.

Iron-Zircon Pigments Prepared by Non-Hydrolytic Sol-Gel Method at Low Temperature

2011 ◽  
Vol 412 ◽  
pp. 223-226 ◽  
Author(s):  
Wei Hui Jiang ◽  
Yan Hui Yang ◽  
Qing Xia Zhu ◽  
Jian Min Liu
Keyword(s):  
Crystal Structure ◽  
Low Temperature ◽  
Ferric Chloride ◽  
Lithium Fluoride ◽  
Sol Gel ◽  
Zircon Crystal ◽  
Molar Ratio ◽  
Gel Method ◽  
Sol Gel Method ◽  
Anhydrous Ferric Chloride

ron-zircon pigment has been synthesized by non-hydrolytic sol-gel method using zirconium chloride and tetraethoxysilane as precursors, anhydrous ferric chloride as colorant, lithium fluoride as mineralizer and anhydrous ethanol as solvent. Iron-zircon pigment has been characterized by means of DTA-TG, XRD, Colorimeter and TEM. The results show that only a small fraction of iron is incorporated in the zircon crystal structure while the remaining iron cations are trapped within the zircon matrix. The iron-zircon with the red value (a*) of 20.64 can be synthesized at 700°C with the optimum Fe/Zr molar ratio of 0.2.

scholarly journals Ethanol/acetaldehyde conversion into butadiene over sol–gel ZrO2–SiO2 catalysts doped with ZnO

RSC Advances ◽  
2017 ◽  
Vol 7 (12) ◽  
pp. 7140-7149 ◽  
Author(s):  
Yuchao Xu ◽  
Zongzhang Liu ◽  
Zheng Han ◽  
Minhua Zhang
Keyword(s):  
High Performance ◽  
Sol Gel ◽  
Gel Method ◽  
Sol Gel Method

High performance and stability of a ZnO/ZrO2–SiO2 catalyst prepared via a sol–gel method in ethanol and acetaldehyde conversion into 1,3-butadiene process.

The Influences of Different Precursors on Morphology of Bi3TiNbO9 Powders Prepared by a Sol-Gel Method

2013 ◽  
Vol 815 ◽  
pp. 765-772 ◽  
Author(s):  
Zuo Dong Li ◽  
Dan Liu
Keyword(s):  
Ethylene Glycol ◽  
Chemical Method ◽  
Single Phase ◽  
Perovskite Phase ◽  
Sol Gel ◽  
Particle Morphology ◽  
Deionized Water ◽  
Molar Ratio ◽  
Molar Ratios ◽  
Baking Process

Bi3NbTiO9 (BNTO) powders were synthesized by a sol-gel chemical method using niobium oxalates, bismuth nitrate and tetra-n-butyl-titanate as starting materials. In order to determine the influence of the molar ratio of the deionized water to ethylene glycol on the particle morphology and crystallization, different molar ratios, the deionized water/ethylene glycol, were chosen to prepare BNTO powders. Single phase BNTO powders could be obtained at a calcinations temperature of 600°C. Moreover, the possible formation mechanism of BNTO powders was also proposed in this paper. In the baking process, perovskite phase BNTO was formed via a reaction between oxides and bismuth niobium.

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