Photocatalytic Activity of Bi2O3 Prepared by Different Precipitants

2011 ◽  
Vol 239-242 ◽  
pp. 998-1001 ◽  
Author(s):  
Jun Bo Zhong ◽  
Jun Zeng ◽  
Jian Zhang Li ◽  
Wei Hu
Keyword(s):  
Photocatalytic Activity ◽  
Specific Surface ◽  
Surface Area ◽  
Pore Volume ◽  
Diffuse Reflectance ◽  
Photocatalytic Performance ◽  
Strong Dependence ◽  
Bet Surface Area ◽  
Precipitation Method ◽  
Average Size

Paralled flaw precipitation method has been employed to synthesize nanostructured Bi2O3. It is found that the bandgap and photocatalytic performance of Bi2O3 has a strong dependence on the kind of precipitants. The prepared photocatalysts were characterized by BET, XRD, UV-Vis diffuse reflectance and SEM. The results show that Bi2O3 prepared by NH3·H2O has the highest BET surface area, pore volume, the smallest pore size and the particle average size. Bi2O3 prepared by NH3·H2O exhibits the best photocatalytic activity. The results of further experiments show that bandgap and the specific surface area all play an important role in promotion of photocatalytic activity of Bi2O3 prepared by NH3·H2O.

Photocatalytic Performance of SnO2 Prepared by Different Precipitants

2013 ◽  
Vol 331 ◽  
pp. 540-543
Author(s):  
Sheng Tian Huang ◽  
Jun Bo Zhong ◽  
Jian Zhang Li ◽  
Wei Hu
Keyword(s):  
Photocatalytic Activity ◽  
Specific Surface ◽  
Surface Area ◽  
Diffuse Reflectance ◽  
Photocatalytic Performance ◽  
Strong Dependence ◽  
Bet Surface Area ◽  
Surface Areas ◽  
Specific Surface Areas ◽  
Average Size

Parallel flow precipitation has been employed to prepare nanostructured SnO2. It is found that the specific surface areas and photocatalytic performance of SnO2 has a strong dependence on the kind of precipitant. The prepared photocatalysts were characterized by BET, XRD, UV-Vis diffuse reflectance and SEM. The results show that SnO2 prepared by NH3·H2O + (NH4)2CO3 has the highest BET surface area and the smallest crystal average size. SnO2 prepared by NH3·H2O + (NH4)2CO3 exhibits the best photocatalytic activity. The results of further experiments show that the specific surface area plays an important role in promotion of photocatalytic activity of SnO2 prepared by NH3·H2O + (NH4)2CO3.

Photocatalytic Activity of Bi2O3 Prepared by Different pH Value

2011 ◽  
Vol 418-420 ◽  
pp. 554-557 ◽  
Author(s):  
Yan Lu ◽  
Xi Yang He ◽  
Jun Bo Zhong ◽  
Jian Zhang Li ◽  
Wei Hu
Keyword(s):  
Photocatalytic Activity ◽  
Surface Area ◽  
Diffuse Reflectance ◽  
Crystal Size ◽  
Photocatalytic Performance ◽  
Ph Value ◽  
Strong Dependence ◽  
Bet Surface Area ◽  
Precipitation Method ◽  
Average Crystal Size

Abstract. Bismuth oxide is an important metal-oxide semicondutor, the interest in developing methods which can prepare Bi2O3 with unique properties has been a hot issue recently. In this paper, paralled flaw precipitation method has been employed to synthesize nanostructured Bi2O3. It is found that the bandgap and photocatalytic performance of Bi2O3 has a strong dependence on the pH value of precipitation reaction.The prepared photocatalysts were characterized by BET, XRD and UV-Vis diffuse reflectance. The results show that Bi2O3 prepared under pH value 8.5 has the highest BET surface area, pore volume, the smallest pore size and the average crystal size. Bi2O3 prepared under pH value 8.5 exhibits the best photocatalytic activity. The results of further experiments show that bandgap and the specific surface area all play an important role in promotion of photocatalytic activity of Bi2O3 prepared under pH 8.5.

Improved Photocatalytic Activity of La3+-Doped Bi2O3

2011 ◽  
Vol 239-242 ◽  
pp. 86-89 ◽  
Author(s):  
Jun Zeng ◽  
Jun Bo Zhong ◽  
Jian Zhang Li ◽  
Shao Hua Wang ◽  
Wei Hu
Keyword(s):  
Photocatalytic Activity ◽  
Binding Energy ◽  
Specific Surface ◽  
Pore Size ◽  
Surface Area ◽  
Specific Surface Area ◽  
Pore Volume ◽  
Diffuse Reflectance ◽  
Bet Surface Area

In this paper, Bi2O3 doped with different amount of La3+ was prepared. The prepared photocatalysts were characterized by BET, XRD, UV-VIS diffuse reflectance and XPS. The results show that 3%La3+-Bi2O3 prepared has the highest BET surface area, pore volume, the smallest pore size. 3%La3+-Bi2O3 exhibits the best photocatalytic activity. The results of further experiments show that the specific surface area, UV-Vis diffuse reflectance and the binding energy all play an important role in promotion of photocatalytic activity of Bi2O3 nanostructure.

Fabrication and Photocatalytic Performance of Bi2O3 Doped with Fe3+

2011 ◽  
Vol 399-401 ◽  
pp. 1425-1428
Author(s):  
Jun Zeng ◽  
Feng Chun Zeng ◽  
Jun Bo Zhong ◽  
Jian Zhang Li ◽  
Shao Hua Wang ◽  
...  
Keyword(s):  
Photocatalytic Activity ◽  
Surface Area ◽  
Diffuse Reflectance ◽  
Diffuse Reflectance Spectroscopy ◽  
Bet Surface Area ◽  
Precipitation Method ◽  
Molar Ratio ◽  
Bet Method ◽  
Co Precipitation ◽  
Average Size

In this paper, Bi2O3 and Fe3+-doped Bi2O3 photocatalysts with different molar ratio of Bi /Fe (nBi:nFe =100:1,2,3,4) was prepared by paralled flaw co-precipitation method. The prepared photocatalysts were characterized by Brunauer-Emmet Teller (BET) method, X-ray diffraction( XRD) and UV-Vis diffuse reflectance spectroscopy. The results show that 3% Fe3+-Bi2O3 prepared has the highest BET surface area, pore volume, the smallest pore size and the particle average size. 3% Fe3+-Bi2O3 exhibits the best photocatalytic activity. The results of further experiments show that the specific surface area, UV-Vis diffuse reflectance all play an important role in promotion of photocatalytic activity of Bi2O3 nanostructure.

Synthesis and Photocatalytic Property of BiVO4/FeVO4 Composite Novel Photocatalyst

2010 ◽  
Vol 129-131 ◽  
pp. 784-788 ◽  
Author(s):  
Min Wang ◽  
Qiong Liu ◽  
Dong Zhang
Keyword(s):  
Photocatalytic Activity ◽  
Specific Surface ◽  
Surface Area ◽  
Specific Surface Area ◽  
Photocatalytic Property ◽  
Precipitation Method ◽  
X Ray Diffraction ◽  
Experimental Conditions ◽  
Triclinic Phase ◽  
Xrd Patterns

BiVO4/FeVO4 composite photocatalyst samples were prepared by calcining the mixture of FeVO4 and BiVO4 precusor which were prepared through liquid phase precipitation method for further increasing the photocatalytic efficiency of FeVO4. The catalysts were characterized by X-ray diffraction (XRD), scanning electron microsoope（SEM）and specific surface area (BET). The photocatalytic activity was evaluated by photocatalytic degradation of methyl orange (MO) solution under visible light. The XRD patterns indicate that BiVO4/FeVO4 composite photocatalysts consist of triclinic phase and the lattice was not distorted beacause of doping Bi. But the morphology change greatly and the specific surface area has little change. In the experimental conditions used, the optimal photocatalytic activity for all the prepared samples was reached when BiVO4 doping was 22 at%. The degradation rate of MO was increased by 20％ or so than that of pure FeVO4.

The Influence of Sinterng Temperature on the Phase, Microstructure and Textual Properties of Hollow Hydroxyapatite Microspheres

2011 ◽  
Vol 239-242 ◽  
pp. 2274-2279 ◽  
Author(s):  
Ying Chun Wang ◽  
Wen Hai Huang ◽  
Ai Hua Yao ◽  
De Ping Wang
Keyword(s):  
Specific Surface ◽  
Pore Size ◽  
Surface Area ◽  
Specific Surface Area ◽  
Pore Volume ◽  
Sintering Temperature ◽  
Total Pore Volume ◽  
Precipitation Method ◽  
Simple Method ◽  
Air Atmosphere

A simple method to prepare hollow hydroxyapatite (HAP) microspheres with mespores on the surfaces is performed using a precipitation method assisted with Li2O-CaO-B2O3(LCB) glass fabrication process. This research is concerned with the effect of sintering temperature on the microstructure evolution, phase purity, surface morphology, specific surface area, and porosity after sintering process. The microspheres were sintered in air atmosphere at temperatures ranging from 500 to 900 °C. The starting hollow HAP microspheres and the sintered specimens were characterized by scanning electron microscope, X-ray diffractometer, specific surface area analyzer, and Hg porosimetry, respectively. The as-prepared microspheres consisted of calcium deficient hydroxyapatite. The results showed that the as-prepared hollow HAP microspheres had the highest specific surface areas, and the biggest total pore volume. The pore size distribution of the as-prepared hollow HAP microspheres were mainly the mesopores in the range of 2～40 nm. The specific surface area and total pore volume of hollow HAP microspheres decreased with increasing sintering temperature. Whereas the mean pore size increased with increasing sintering temperature. It showed that at 700°C, Ca-dHAP decomposes into a biphasic mixture of HAP and β-calcium phosphate(TCP).

The Hydrothermal Synthesis and Photocatalysis of TiO2 Powders

2011 ◽  
Vol 183-185 ◽  
pp. 2024-2027
Author(s):  
Li Ming Jiang
Keyword(s):  
Photocatalytic Activity ◽  
Hydrothermal Synthesis ◽  
Specific Surface ◽  
Surface Area ◽  
Specific Surface Area ◽  
Organic Molecule ◽  
Photocatalytic Performance ◽  
Hydrothermal Conditions ◽  
Anatase Structure

Titania powders were prepared under hydrothermal conditions by employing organic molecule β-cyclodextrin(CD) as template, and characterized by means of TGA、XRD、BET . The effects of the pH on the specific surface area and photocatalytic performance of titania were discussed. The results showed that titania powders were anatase structure;the titania powders with specific surface area up to 216.2 m2g-1 were prepared while the system pH was about 1 , and the powders had the best photocatalytic activity.

TiO2 composite films on different substrates with enhanced visible light photocatalytic performance

2020 ◽  
Vol 13 (07) ◽  
pp. 2051037
Author(s):  
Ke Han ◽  
Guobao Li ◽  
Fang Li ◽  
Mingming Yao
Keyword(s):  
Photocatalytic Activity ◽  
Visible Light ◽  
Specific Surface ◽  
Surface Area ◽  
Specific Surface Area ◽  
Photocatalytic Performance ◽  
Sol Gel ◽  
Composite Films ◽  
Methyl Green ◽  
Photogenerated Electrons

For the sake of improving the photocatalytic performance of TiO2, we prepared the B/Ag/Fe tridoped TiO2 films on common glass and stone substrates by the sol–gel method. In this work, the optical absorption, recombination of photogenerated electrons (e−) and holes (h[Formula: see text]), crystal types, thermal stability, composition, specific surface area and photocatalytic activity of the modified TiO2 films were investigated. The results indicated that B/Ag/Fe tridoping not only enhanced the absorption of visible light by TiO2, but inhibited the recombination of electron–hole (e−/h[Formula: see text]) pairs. The tridoping also promoted the formation of anatase and prevented the transformation of anatase to rutile at high temperature. The composite TiO2 has a large specific surface area, about three times that of pure TiO2. The photocatalytic activity of the TiO2 films were evaluated by methyl green (MG) and formaldehyde degradation. In all samples, the B/Ag/Fe tridoped TiO2 film exhibited the highest degradation rate of MG under both ultraviolet and visible light irradiation. The improvement of photocatalytic performance of TiO2 films is due to the synergistic effect of the B/Ag/Fe tridoping, which enhances the absorption of visible light and prolongs the lifetime of e−/h[Formula: see text] pairs and facilitates transfer of interface charge.

Photocatalytic Performance of Co3O4 Prepared with the Assistance of Different Surfactants

2012 ◽  
Vol 549 ◽  
pp. 8-11
Author(s):  
Tao Wang ◽  
Jian Zhang Li ◽  
Shao Hua Wang ◽  
Jun Bo Zhong ◽  
Jun Zeng
Keyword(s):  
Photocatalytic Activity ◽  
Photocatalytic Performance ◽  
Strong Dependence ◽  
Precipitation Method ◽  
Sodium Dodecylbenzenesulfonate ◽  
Surface Parameters ◽  
Sem Image

In this paper, parallel flaw precipitation method has been employed to fabricate nanostructured Co3O4 with the assistance of different surfactants. It is found that the surface parameters, SEM image and photocatalytic performance of Co3O4 have a strong dependence on the type of surfactants. The prepared photocatalysts Co3O4 were characterized by BET, XRD and SEM. The results show that Co3O4 prepared with the assistance of sodium dodecylbenzenesulfonate exhibits the best photocatalytic activity among the experimented compositions. The surface parameters and SEM all play an important role in promotion of photocatalytic activity of Co3O4 prepared.

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