Hydrothermal Preparation and Photocatalytic Activity of Different Morphology Titania

2012 ◽  
Vol 510 ◽  
pp. 569-574 ◽  
Author(s):  
Huai Yuan Wang ◽  
Yan Ji Zhu ◽  
Zhen Yu ◽  
You Zhuang Zhu ◽  
Ying Chen
Keyword(s):  
Photocatalytic Activity ◽  
Methyl Orange ◽  
Specific Surface ◽  
Photocatalytic Degradation ◽  
Anatase Phase ◽  
Tetrabutyl Titanate ◽  
Hydrothermal Preparation ◽  
Surface Areas ◽  
Template Free ◽  
Specific Surface Areas

TiO2 samples with various shapes like flake, nanofiber and large grain were synthesized by template-free hydrothermal method with rutile TiO2 or tetrabutyl titanate (Ti (OC4H9)4, TBOT) as precursor. Photocatalytic degradation performances were investigated by using methyl orange (MO) as modeling pollutant. The results shown that pure mesoporous anatase TiO2-Grain showed the highest photocatalytic activity (3.7 times higher than P25), which is due to a combinative effect of anatase phase and high specific surface areas. The bi-phase flaky TiO2 also have higher activity than P25. While, nanofiber with TiO2(B) phase has the lowest photocatalytic activity. The large sized TiO2 grain can be separated and recycled easily after reaction.

scholarly journals Photocatalytic activity of CaTaO2N nanocrystals obtained from a hydrothermally synthesized oxide precursor

2019 ◽  
Author(s):  
Roberto Köferstein
Keyword(s):  
Photocatalytic Activity ◽  
Methyl Orange ◽  
Specific Surface ◽  
Morphological Properties ◽  
Soft Chemistry ◽  
Co Catalyst ◽  
Surface Areas ◽  
Oxide Precursor ◽  
Photocatalytic Activities ◽  
Specific Surface Areas

Highly crystalline CaTaO2N nanoparticles possessing large specific surface areas were investigated as photocatalysts for the decomposition of methyl orange. Two different Ca2Ta2O7 precursors were synthesized by classical solid state synthesis and a hydrothermal soft-chemistry approach, respectively. In both cases, nitridation was carried out by thermal ammonolysis. The obtained CaTaO2N samples were compared with respect to their optical, thermal and morphological properties as well as their photocatalytic activities. In particular, the influence of ammonolysis temperature on the photocatalytic properties was studied. Using hydrothermally synthesized Ca2Ta2O7, phase pure CaTaO2N was obtained already at a relatively low ammonolysis temperature of 860 °C. Morphological investigations show that the CaTaO2N samples from the hydrothermally synthesized precursor consist of single-crystalline particles of 45 to 70 nm diameter with high specific surface areas between 12 and 19 m2 g-1, depending on ammonolysis temperature. A considerable photocatalytic activity for methyl orange degredation was found for the nanoscaled CaTaO2N particles prepared at lower ammonolysis temperatures. Using CoOx as co-catalyst, a further strong enhancement of the methyl orange decomposition by a factor 5-10 was achieved.

Solvothermal Synthesis of WO3 Photocatalysts and their Enhanced Activity

2011 ◽  
Vol 485 ◽  
pp. 283-286
Author(s):  
Yuji Kondo ◽  
Shinobu Fujihara
Keyword(s):  
Titanium Dioxide ◽  
Photocatalytic Activity ◽  
Specific Surface ◽  
Tungsten Trioxide ◽  
Solvothermal Synthesis ◽  
Solvothermal Method ◽  
Spherical Particles ◽  
Hierarchical Architecture ◽  
Surface Areas ◽  
Specific Surface Areas

Tungsten trioxide (WO3) is known as a visible light responsive photocatalyst, but its photocatalytic activity is relatively low, as compared to that of anatase titanium dioxide (TiO2). To enhance the activity, high specific surface areas are necessary. In this study, WO3particles with a hierarchical architecture, which was assemblies of spherical particles 20 – 30 nm in diameter, were synthesized by the solvothermal method. The hierarchical WO3particles had high specific surface areas and their photocatalytic activity was found to be 2.5 times higher than that of the commercial WO3.

Photocatalyst TiO2 Supported on Bentonite for Water Organic Pollutants Purification: A Literature Review

2012 ◽  
Vol 463-464 ◽  
pp. 967-974 ◽  
Author(s):  
Mei Jiao Lin ◽  
Min Song ◽  
Xue You Shen
Keyword(s):  
Literature Review ◽  
Specific Surface ◽  
Photocatalytic Degradation ◽  
Influencing Factors ◽  
Organic Pollutants ◽  
Composite Photocatalyst ◽  
Promising Technology ◽  
Surface Areas ◽  
Photo Catalysis ◽  
Specific Surface Areas

Photocatalytic degradation of waste pollutants using TiO2is a promising technology. Recently, the use of bentonite for the removal of organic pollutants was widely studied because of large specific surface areas. Studies have shown that TiO2supported on bentonite, or TiO2/bentonite composite, exhibits bifunctionality of adsorption and photo catalysis in synergism. This paperpresents a literature review of the preparation and modification techniques of bentonite/TiO2composite photocatalyst, and their characteristics. The review will also focus on the current researches on the degradation of water organic pollutants by using bentonite/TiO2composite photocatalyst and its key influencing factors.

scholarly journals Enhanced Photocatalytic Activity for Degradation of Methyl Orange over Silica-Titania

2011 ◽  
Vol 2011 ◽  
pp. 1-9 ◽  
Author(s):  
Yaping Guo ◽  
Shaogui Yang ◽  
Xuefei Zhou ◽  
Chunmian Lin ◽  
Yajun Wang ◽  
...  
Keyword(s):  
Photocatalytic Activity ◽  
Methyl Orange ◽  
Specific Surface ◽  
Surface Area ◽  
Calcination Temperature ◽  
Specific Surface Area ◽  
Photoelectron Spectroscopy ◽  
Anatase Phase ◽  
Solution Treatment ◽  
X Ray

Silica-modified titania (SMT) powders with different atomic ratios of silica to titanium (Rx) were successfully synthesized by a simple ultrasonic irradiation technique. The prepared samples were characterized by X-ray diffraction (XRD), FT-IR spectroscopy, transmission electron microscopy (TEM), X-ray photoelectron spectroscopy (XPS), and ultraviolet visible spectroscopy. The specific surface area was measured according to BET theory. Results indicate that the addition of silica to titania can suppress the crystalline size growth and the transformation of anatase phase to rutile phase of titania, enlarge specific surface area of the titania particles, and result in a blue shift of absorption edge compared to pure titania. The photocatalytic activity of the SMT samples was evaluated by decolorizing methyl orange aqueous solutions under UV-visible light irradiation. It was found in our study that this activity was affected by silica content, calcination temperature, H2SO4, and oxidants such as KIO4, (NH4)2S2O8and H2O2. The results reveal that the photocatalytic activity of 0.1-SMT catalyst is the best among all samples calcined at550°C for 1 h and it is 1.56 times higher than that of Degussa P-25 titania, which is a widely used commercial TiO2made by Germany Degussa company and has been most widely used in industry as photocatalyst, antiultraviolet product, and thermal stabilizer. The optimal calcination temperature for preparation was550°C. The photocatalytic activity of SMT samples is significantly enhanced by H2SO4solution treatment and oxidants.

Three-dimensionally Hierarchical Bi2WO6 Architectures with Enhanced Photocatalytic Activity

NANO ◽  
2016 ◽  
Vol 11 (12) ◽  
pp. 1650135 ◽  
Author(s):  
Tianhua Chen ◽  
Hongbing Lu ◽  
Jinniu Zhang ◽  
Jianzhi Gao ◽  
Feng Yin ◽  
...  
Keyword(s):  
Photocatalytic Activity ◽  
Specific Surface ◽  
Rhodamine B ◽  
Photocatalytic Performance ◽  
Ph Value ◽  
Precursor Solution ◽  
Structural Features ◽  
Oxygen Species ◽  
Surface Areas ◽  
Specific Surface Areas

Three-dimensionally hierarchical Bi2WO6 architectures have been produced via a facile and economical hydrothermal method without any template or surfactant. This architecture with flower-like morphology is assembled by numbers of intercrossed nanosheets. Moreover, different Bi2WO6 nanostructures including multilayered disks and irregular nanoplates can also be produced by simply adjusting the pH value of the precursor solution. Importantly, this kind of hierarchically structured Bi2WO6 architecture exhibits a much better photocatalytic activity in the photodegradation of rhodamine B than that of conventional Bi2WO6 multilayered disks and nanoplates. This enhanced photocatalytic performance is mainly attributed to the large specific surface areas, special structural features and high capability of absorbed oxygen species. The present work offers an effective approach for the further improvement of photocatalytic activity by designing a desirable micro/nanoarchitecture.

Electrospun anatase-phase TiO2 nanofibers with different morphological structures and specific surface areas

2013 ◽  
Vol 398 ◽  
pp. 103-111 ◽  
Author(s):  
Guangfei He ◽  
Yibing Cai ◽  
Yong Zhao ◽  
Xiaoxu Wang ◽  
Chuilin Lai ◽  
...  
Keyword(s):  
Specific Surface ◽  
Anatase Phase ◽  
Tio2 Nanofibers ◽  
Surface Areas ◽  
Specific Surface Areas

Preparation, Characterization and Photocatalytic Properties of Cu, P-codoped TiO2 Nanoparticles

2011 ◽  
Vol 239-242 ◽  
pp. 2562-2565 ◽  
Author(s):  
Mei Ru Xu ◽  
Gang Ni ◽  
Fang Zhao
Keyword(s):  
Photocatalytic Activity ◽  
Methyl Orange ◽  
Calcination Temperature ◽  
Crystalline Phase ◽  
Anatase Phase ◽  
Sol Gel ◽  
Tetrabutyl Titanate ◽  
Tem Analysis ◽  
Gel Method ◽  
Phase Transform

A novel copper and phosphorus codoped TiO2 photocatalyst was synthesized by modified sol–gel method using tetrabutyl titanate, Cu(NO3)2 and H3PO4 as precursors. The samples were characterized by XRD, TEM, TGA, EDX. The TGA indicated the calcination temperature is 450°C. The XRD results showed undoped and Cu, P-codoped TiO2 nanoparticles only include anatase phase, and the temperture of crystalline phase transform for Cu, P codeped TiO2 had changed compared with undoped. The TEM analysis revealed the doping of Cu and P suppressed the growth of TiO2 grains. The photocatalytic activity of samples was tested for degradation of 20 mg·L−1 methyl orange (MO) solutions. The results showed photocatalytic activity of the catalysts with 0.5% Cu, 0.375% P-codoped TiO2 was higher than pure TiO2 under ultraviolet (UV).

scholarly journals An eco-friendly route for template-free synthesis of high specific surface area mesoporous CeO2 powders and their adsorption for acid orange 7

RSC Advances ◽  
2019 ◽  
Vol 9 (39) ◽  
pp. 22366-22375 ◽  
Author(s):  
Yaohui Xu ◽  
Ruixing Li ◽  
Yang Zhou
Keyword(s):  
Specific Surface ◽  
Surface Area ◽  
Specific Surface Area ◽  
High Specific Surface Area ◽  
Acid Orange 7 ◽  
Acid Orange ◽  
Surface Areas ◽  
Template Free ◽  
Specific Surface Areas ◽  
Mesoporous Ceo2

An eco-friendly route for template-free synthesis of mesoporous CeO2 powders with high specific surface areas.

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.

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