Titanium Dioxide Nanomaterials: Synthesis, Properties, Modifications, and Applications

Photoinduced reactivity of titanium dioxide

http://sealight.persiangig.com/document/1.pdf

Use of iron oxide nanomaterials in wastewater treatment: a review.

Persistent organic pollutants (POPs) are carbon-based chemical substances that are resistant to environmental degradation and may not be completely removed through treatment processes. Their persistence can contribute to adverse health impacts on wild-life and human beings. Thus, the solar photocatalysis process has received increasing attention due to its great potential as a green and eco-friendly process for the elimination of POPs to increase the security of clean water. In this context, ZnO nanostructures have been shown to be prominent photocatalyst candidates to be used in photodegradation owing to the facts that they are low-cost, non-toxic and more efficient in the absorption across a large fraction of the solar spectrum compared to TiO 2 . There are several aspects, however, need to be taken into consideration for further development. The purpose of this paper is to review the photo-degradation mechanisms of POPs and the recent progress in ZnO nanostructured fabrication methods including doping, heterojunction and modification techniques as well as improvements of ZnO as a photocatalyst. The second objective of this review is to evaluate the immobilization of photocatalyst and suspension systems while looking into their future challenges and prospects.

A review of ZnO nanoparticles as solar photocatalysts: Synthesis, mechanisms and applications

Synthesis, properties, and applications of magnetic iron oxide nanoparticles

Nanosized TiO 2 powders were prepared using the sol-gel procedure. The selected colloidal suspensions were stabilized with polyethylene glycol (PEG). This polymer prevented sintering of TiO 2 particles during the calcination of the starting material. X-ray powder diffraction (XRD) phase analysis showed that the samples, obtained up to 500°C, were a mixture of anatase and brookite. In the samples, obtained at 850°C and higher temperatures, rutile as a single phase was detected. The TGA/DTA curves were dependent on the preparation of TiO 2 samples. The samples were also characterized by Fourier transform infrared spectroscopy and laser Raman spectroscopy. A new method, based on low-frequency Raman scattering, was proposed for the size determination of nanosized TiO 2 . The size determination of nanosized TiO 2 by low-frequency Raman scattering was in a good agreement with crystallite size values obtained by XRD.

Chemical and micro structural properties of TiO2 synthesized by sol-gel procedure

https://bib.irb.hr/datoteka/300775.Mossauer_FTIR_and_FE_SEM_investigation_of_iron_oxides_precipitated_from_FeSo4_solutions.pdf

Mössbauer, FT-IR and FE SEM investigation of iron oxides precipitated from FeSO4 solutions

https://bib.irb.hr/datoteka/206485.2006_Synthesis_and_characterisation_of_bismuthIII_vanadate_Gotic.pdf

Synthesis and characterisation of bismuth(III) vanadate

Tungsten trioxide hydrates were synthesized by (a) cation exchange reaction from sodium tungstate solution and (b) precipitation from sodium tungstate solution by the addition of HCl solution. The samples were analyzed by XRD, DTA/TGA, Raman and FT-IR spectroscopy. XRD showed formation of WO 3 ·H 2 O by cation exchange reaction, whereas WO 3 ·0.33H 2 O was identified by XRD as a product of the acidification of sodium tungstate solution with HCl solution. After heating at 320°C, WO 3 ·H 2 O transformed into WO 3 , whereas the WO 3 ·0.33H 2 O crystal structure remained and these results were in agreement with DTA/TGA measurements. The WO 3 ·H 2 O sample synthesized by cation exchange reaction showed a weight loss corresponding to one molecule of water in the crystal structure. However, samples WO 3 ·0.33H 2 O showed a much greater weight loss upon heating than could be expected on the basis of the WO 3 0.33H 2 O formula. The phase transition WO 3 ·H 2 O→WO 3 was also monitored by Raman and FT-IR spectroscopy. In the case of WO 3 ·0.33H 2 O samples, the basic features of Raman and FT-IR spectra did not change on heating to 320°C, thus indicating that the heating of WO 3 ·0.33H 2 O up to this temperature did not destroy the original crystal structure. Contrary to this, after heating the WO 3 ·H 2 O sample to 320°C, the Raman and FT-IR spectra showed a series of new bands caused by the phase transition WO 3 ·H 2 O→WO 3 .

https://www.bib.irb.hr/48651/download/48651.2000_Synthesis_of_tungsten_trioxide_hydrates_and_their_structural_Mater_Sci_Eng_B.pdf

Synthesis of tungsten trioxide hydrates and their structural properties

https://bib.irb.hr/datoteka/37309.1999_TiO2_synthesized_by_the_solgel_method_based_on_an_esterification_reaction_Gotic.pdf

Marijan Gotić

Papers

Chemical and micro structural properties of TiO2 synthesized by sol-gel procedure

Mössbauer, FT-IR and FE SEM investigation of iron oxides precipitated from FeSO4 solutions

Synthesis and characterisation of bismuth(III) vanadate

Synthesis of tungsten trioxide hydrates and their structural properties

XRD, Raman and FT-IR spectroscopic observations of nanosized TiO2 synthesized by the sol–gel method based on an esterification reaction