Amorphous TiO2 nanostructures: synthesis, fundamental properties and photocatalytic applications

2019 ◽  
Vol 9 (16) ◽  
pp. 4198-4215 ◽  
Author(s):  
Shaodong Sun ◽  
Peng Song ◽  
Jie Cui ◽  
Shuhua Liang
Keyword(s):  
Fundamental Properties ◽  
Amorphous Tio2 ◽  
Photocatalytic Applications ◽  
Tio2 Nanostructures ◽  
Made In

In this review, we mainly highlight the advances made in the development of amorphous TiO2 nanostructures for photocatalysts. Some perspectives on the challenges and new direction are also discussed.

CdS-Based photocatalysts

2018 ◽  
Vol 11 (6) ◽  
pp. 1362-1391 ◽  
Author(s):  
Lei Cheng ◽  
Quanjun Xiang ◽  
Yulong Liao ◽  
Huaiwu Zhang
Keyword(s):  
Recent Progress ◽  
Fundamental Properties ◽  
Photocatalytic Applications

The review summarizes the recent progress in the synthesis, fundamental properties, morphology, photocatalytic applications and challenges of CdS-based photocatalysts.

scholarly journals Effect of pH on the Formation of Amorphous TiO2 Complexes and TiO2 Anatase during Pyrolysis of Aqueous TiCl4 Solution

2020 ◽  
Author(s):  
Mai Van Tuan ◽  
Mai Xuan Dung ◽  
Duong Ngoc Huyen
Keyword(s):  
Heat Treatment ◽  
Methylene Blue ◽  
Low Temperature ◽  
Low Ph ◽  
Effect Of Ph ◽  
Amorphous Tio2 ◽  
Ph Level ◽  
Tio2 Nanostructures ◽  
Tio2 Nanostructure

The TiO2 nanostructures resulted by pyrolysis of TiCl4 at low temperature of 80 oC are found to be a mixture of amorphous TiO2 complexes and anatase nanostructure whose ratio depends on the pH of the pyrolysis medium. At low pH level, the resulting TiO2 nanostructure is predominant anatase and gradually shifts to the amorphous TiO2 complexes with pH level increasing. By means of heat treatment, the amorphous TiO2 complexes can be converted back to the anatase nanostructure and then transform to rutile with the elevating temperature. Amongst of the TiO2 nanostructure recovered from amorphous TiO2 complexes, the anatase shows to be the most effective photocatalyst in decomposition of methylene blue.

scholarly journals Effect of pH on the Formation of Amorphous TiO2 Complexes and TiO2 Anatase during Pyrolysis of TiCl4 Aqueous Solution

2020 ◽  
Author(s):  
Mai Xuan Dung ◽  
Tuan Mai Van ◽  
Huyen Duong Ngoc
Keyword(s):  
Heat Treatment ◽  
Aqueous Solution ◽  
Methylene Blue ◽  
Low Temperature ◽  
Low Ph ◽  
Effect Of Ph ◽  
Amorphous Tio2 ◽  
Ph Level ◽  
Tio2 Nanostructures ◽  
Tio2 Nanostructure

The TiO2 nanostructures resulted by pyrolysis of TiCl4 at low temperature of 80 oC are found to be a mixture of amorphous TiO2 complexes and anatase nanostructure that depends on the pH of the pyrolysis medium. Anatase nanostructure is predominant at low pH level and gradually converts to amorphous TiO2 complexes with increasing pH level. By means of heat treatment, the TiO2 nanostructures can be recovered from amorphous TiO2 complexes. Amongst of the TiO2 nanostructure recovered from amorphous TiO2 complexes, the anatase nanostructure shows to be the strongest photocatalyst in decomposition of methylene blue.

A facile approach for high surface area electrospun TiO2 nanostructures for photovoltaic and photocatalytic applications

2014 ◽  
Vol 43 (12) ◽  
pp. 4830 ◽  
Author(s):  
T. A. Arun ◽  
Asha Anish Madhavan ◽  
Daya K. Chacko ◽  
G. S. Anjusree ◽  
T. G. Deepak ◽  
...  
Keyword(s):  
Surface Area ◽  
High Surface ◽  
High Surface Area ◽  
Photocatalytic Applications ◽  
Tio2 Nanostructures

scholarly journals Effect of pH on the Formation of Amorphous TiO2 Complexes and TiO2 Anatase during the Pyrolysis of an Aqueous TiCl4 Solution

Catalysts ◽  
2020 ◽  
Vol 10 (10) ◽  
pp. 1187
Author(s):  
Huyen Duong Ngoc ◽  
Dung Mai Xuan ◽  
Tuan Mai Van
Keyword(s):  
Methylene Blue ◽  
Titanium Dioxide ◽  
Low Temperature ◽  
Titanium Tetrachloride ◽  
Low Ph ◽  
Tio2 Anatase ◽  
Heating Treatment ◽  
Amorphous Tio2 ◽  
Ph Level ◽  
Tio2 Nanostructures

The titanium dioxide (TiO2) nanostructures resulted by the pyrolysis of titanium tetrachloride (TiCl4) at a low temperature of 80 °C were found to be a mixture of amorphous TiO2 complexes and anatase nanostructures, whose ratio depends on the pH of the pyrolysis medium. At a low pH level, the resulting TiO2 nanostructures are predominantly anatase and gradually shift to amorphous TiO2 complexes as the pH level increases. Moreover, the amorphous TiO2 complexes can convert back to anatase nanostructures by a post-heating treatment, and can then transform to rutile with elevating temperature. Amongst the TiO2 nanostructures recovered from the amorphous TiO2 complexes, anatase appears to be the most effective photocatalyst in the decomposition of methylene blue.

Spectrophotometric measurements of objective-prism spectra

1966 ◽  
Vol 24 ◽  
pp. 118-119
Author(s):  
Th. Schmidt-Kaler
Keyword(s):  
Progress Report ◽  
Two Dimensional ◽  
Objective Prism ◽  
Made In

I should like to give you a very condensed progress report on some spectrophotometric measurements of objective-prism spectra made in collaboration with H. Leicher at Bonn. The procedure used is almost completely automatic. The measurements are made with the help of a semi-automatic fully digitized registering microphotometer constructed by Hög-Hamburg. The reductions are carried out with the aid of a number of interconnected programmes written for the computer IBM 7090, beginning with the output of the photometer in the form of punched cards and ending with the printing-out of the final two-dimensional classifications.

Surface Structure in Microtomed Sections Caused by Glass and Diamond Knives

1971 ◽  
Vol 29 ◽  
pp. 456-457
Author(s):  
J. Temple Black ◽  
William G. Boldosser
Keyword(s):  
Plastic Deformation ◽  
Epoxy Resin ◽  
Carbon Coating ◽  
Surface Damage ◽  
Body Angle ◽  
Normal Manner ◽  
Bottom Side ◽  
Cutting Direction ◽  
Made In ◽  
Diamond Knife

Ultramicrotomy produces plastic deformation in the surfaces of microtomed TEM specimens which can not generally be observed unless special preparations are made. In this study, a typical biological composite of tissue (infundibular thoracic attachment) infiltrated in the normal manner with an embedding epoxy resin (Epon 812 in a 60/40 mixture) was microtomed with glass and diamond knives, both with 45 degree body angle. Sectioning was done in Portor Blum Mt-2 and Mt-1 microtomes. Sections were collected on formvar coated grids so that both the top side and the bottom side of the sections could be examined. Sections were then placed in a vacuum evaporator and self-shadowed with carbon. Some were chromium shadowed at a 30 degree angle. The sections were then examined in a Phillips 300 TEM at 60kv.Carbon coating (C) or carbon coating with chrom shadowing (C-Ch) makes in effect, single stage replicas of the surfaces of the sections and thus allows the damage in the surfaces to be observable in the TEM. Figure 1 (see key to figures) shows the bottom side of a diamond knife section, carbon self-shadowed and chrom shadowed perpendicular to the cutting direction. Very fine knife marks and surface damage can be observed.

Iron storage sites in the myocardium as revealed by cytohistochemistry

1988 ◽  
Vol 46 ◽  
pp. 394-395
Author(s):  
M. Ashraf ◽  
F. Thompson ◽  
S. Miki ◽  
P. Srivastava
Keyword(s):  
Cardiac Tissue ◽  
Coronary Perfusion ◽  
Intracellular Iron ◽  
Ether Anesthesia ◽  
Intense Staining ◽  
Iron Storage ◽  
Thin Sections ◽  
Rat Hearts ◽  
Cacodylate Buffer ◽  
Made In

Iron is believed to play an important role in the pathogenesis of ischemic injury. However, the sources of intracellular iron in myocytes are not yet defined. In this study we have attempted to localize iron at various cellular sites of the cardiac tissue with the ferrocyanide technique.Rat hearts were excised under ether anesthesia. They were fixed with coronary perfusion with 3% buffered glutaraldehyde made in 0.1 M cacodylate buffer pH 7.3. Sections, 60 μm in thickness, were cut on a vibratome and were incubated in the medium containing 500 mg of potassium ferrocyanide in 49.5 ml H2O and 0.5 ml concentrated HC1 for 30 minutes at room temperature. Following rinses in the buffer, tissues were dehydrated in ethanol and embedded in Spurr medium.The examination of thin sections revealed intense staining or reaction product in peroxisomes (Fig. 1).

Microanalysis of precipitates in a ferritic steel

1978 ◽  
Vol 36 (1) ◽  
pp. 618-619
Author(s):  
J.M. Titchmarsh
Keyword(s):  
Ferritic Steel ◽  
Particle Identification ◽  
Energy Dispersive ◽  
Objective Lens ◽  
Ferritic Steels ◽  
Replica Technique ◽  
X Ray ◽  
Large Numbers ◽  
Scanning Transmission ◽  
Made In

The advances in recent years in the microanalytical capabilities of conventional TEM's fitted with probe forming lenses allow much more detailed investigations to be made of the microstructures of complex alloys, such as ferritic steels, than have been possible previously. In particular, the identification of individual precipitate particles with dimensions of a few tens of nanometers in alloys containing high densities of several chemically and crystallographically different precipitate types is feasible. The aim of the investigation described in this paper was to establish a method which allowed individual particle identification to be made in a few seconds so that large numbers of particles could be examined in a few hours.A Philips EM400 microscope, fitted with the scanning transmission (STEM) objective lens pole-pieces and an EDAX energy dispersive X-ray analyser, was used at 120 kV with a thermal W hairpin filament. The precipitates examined were extracted using a standard C replica technique from specimens of a 2¼Cr-lMo ferritic steel in a quenched and tempered condition.

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