Sol-Gel Synthesis and Characterization of TiO2-Based Photocatalyst and its Photoactivity Research

The TiO2-based photocatalysts have been synthesized by using sol-gel process and their photocatalytic activities were studied by the degradation of methylene blue (MB). It was shown that the calcination temperature has great influence on the crystalline phase transition of TiO2. For all the samples (Ag-doped and undoped TiO2photocatalysts) calcined at 573K, only anatase phase was observed from XRD diffraction spectra and the intensity of peaks is weak. After the calcined at 773K, a mixture of anatase-rutile phase appeared. The contents of rutile phase were about 85% and77% for undoped and Ag-adopted TiO2photocatalysts.There were only rutile phases for all the TiO2photocatalysts calcined at 973K observed from XRD diffraction spectra. Magnetically stirring time of A solution before added B had no obvious effects on the polymorphs transition of TiO2.

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The Study on the Decomposition of Azo Dye by La-Modified TiO2

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.123-125.276 ◽

2010 ◽

Vol 123-125 ◽

pp. 276-279

Author(s):

Kuo Shan Yao ◽

Yung Hsu Hsieh ◽

Yu Jie Chang ◽

Ching Hsing Lin ◽

Chen Yu Chang ◽

...

Keyword(s):

Azo Dye ◽

Acidic Solution ◽

Supported Catalysts ◽

Anatase Phase ◽

Sol Gel ◽

Rutile Phase ◽

Desorption Process ◽

Sol Gel Process ◽

Photocatalytic Activities ◽

20 Nm

The La/TiO2 photocatalyst was prepared by lanthanum into TiO2 structure in a sol-gel process. The catalyst was characterized by field-emission scanning electron microscope (FE-SEM), X-ray diffractometer (XRD), ESCA, and Brunauer Emmett Teller (BET) analyses. Photocatalytic activities of the supported catalysts were examined through decomposition process of azo-dye Acid Yellow 17 solution under UV irradiation. The results showed that the particle size of TiO2 is about 20 nm, and the particle of La/TiO2 is about 10 nm. The crystal structure is mainly in anatase phase, the contents of the rutile phase increase with the increase of the amount of doped lanthanum. The adsorption capacity of La/TiO2 catalysts increases with lanthanum dosage in the acidic solution. The contribution of actual photodecomposition was determined by desorption process, after the photocatalytic reaction. In the acidic solution, better photodecomposition efficiency is achieved than in the neutral or alkaline solution. The experiments demonstrated that the optimum doping of La at 10 mol %, the maximum photodecomposition in dye concertration at 15 mg L-1 and photocatalytic dosage at 0.75 g L-1, achieving the highest effect.

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Preparation and Characterization of XRD Nano Cu-TiO2 using Sol-Gel Method

10.31227/osf.io/2qu4e ◽

2018 ◽

Author(s):

Arizka Tamarani ◽

Rahadian Zainul ◽

Indang Dewata

Keyword(s):

Crystallite Size ◽

Anatase Phase ◽

Sol Gel ◽

Rutile Phase ◽

Doping Agent ◽

Gel Method ◽

Sol Gel Method ◽

Temperature Range

One of the reported doping agent to increase TiO2 activity is Cu. In this research, TiO2 was prepared by So-Gel method. Preparation was performed by calcinaton at the temperature range of 400, 500, 600ᵒC for 2 hours with a corresponding dopan concentration of 0%, 1%, 3%, 5% mol of TiO2. The nanoparticle materials was characterized using XRD. It is found that anatase phase occur in the calcinations temperature of 400ᵒC and transform to rutile phase at 500ᵒC. The crystallite size of Cudoped TiO2 with dopan concentration of 5% are found 4.63 nm, 8.70 nm, 6.09 nm respectively at 400ᵒC, 500ᵒC, 600ᵒC.

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Sol-gel synthesis and study of neodymium substitution effects in Co-Al-Nd-O system with possible applications as novel inorganic pigments

Open Chemistry ◽

10.2478/s11532-012-0072-8 ◽

2012 ◽

Vol 10 (5) ◽

pp. 1574-1583 ◽

Cited By ~ 1

Author(s):

Dalia Jonynaite ◽

Darius Jasaitis ◽

Rimantas Raudonis ◽

Algirdas Selskis ◽

Remigijus Juskenas ◽

...

Keyword(s):

Sol Gel ◽

Substitution Effects ◽

X Ray Diffraction ◽

X Ray ◽

Force Microscopy ◽

Atomic Force ◽

Sol Gel Process ◽

New Compounds ◽

Sol Gel Synthesis

AbstractIn the present work, the formation of cobalt aluminium spinel (CoAl2O4) as well as novel cobalt neodymium-aluminates with nominal compositions of CoAl1.75Nd0.25O4, CoAl1.5Nd0.5O4 and CoAlNdO4 by an aqueous sol-gel process and the sinterability of the products are investigated. The metal ions, generated by dissolving starting materials of metals in the diluted acetic acid were complexed by 1,2-ethanediol to obtain the precursors for the mixed metal ceramics. The phase purity of the synthesized compounds was characterized by powder X-ray diffraction analysis and infrared spectroscopy. The microstructural evolution and morphological features of the products were studied by scanning electron microscopy and atomic force microscopy, which together with the optical characterization of these new compounds showed that the sol-gel-derived materials could be successfully used as effective cobalt-based ceramic pigments.

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Preparation of Ti/B Binary Oxides by Sol-Gel Method and Their Photocatalytic Activity for Stoichiometric H2O Decomposition

MRS Proceedings ◽

10.1557/proc-454-85 ◽

1996 ◽

Vol 454 ◽

Cited By ~ 2

Author(s):

S. C. Moon ◽

S. Tabata ◽

K. Okada ◽

M. Fujiki ◽

H. Mametsuka

Keyword(s):

Titanium Oxide ◽

Anatase Phase ◽

Aqueous Suspension ◽

Sol Gel ◽

Rutile Phase ◽

Binary Oxide ◽

Gel Method ◽

Sol Gel Method ◽

Binary Oxides ◽

Photocatalytic Activities

ABSTRACTA titanium-boron binary oxide has been prepared by the sol-gel method and characterized using SEM, TEM, UV-VIS reflectance, and X-ray diffraction spectroscopies. These measurements indicated that the obtained Ti/B gel with no treatment exhibited an amorphous structure. After calcination in O2, the crystalline structure of titanium oxide species in the Ti/B binary oxide was changed while boron oxide species maintained in the state of amorphous. Titanium oxide species in the Ti/B binary oxide calcined at 673 K showed an anatase phase of TiO2, and changed with the calcination temperatures from anatase phase to rutile phase. The Pt loaded Ti/B photocatalysts in aqueous suspension system decomposed water stoichiometrically under UV-irradiation. Their photocatalytic activities decreased with increasing the calcination temperature, indicating the photocatalytic activities of the Ti/B binary oxides were depended on the crystal phase of titanium oxide in the Ti/B photocatalysts.

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Sol-Gel Synthesis and Characterization of Neodymium-Ion Doped Nanostructured Titania Thin Films

MRS Proceedings ◽

10.1557/proc-703-v5.2 ◽

2001 ◽

Vol 703 ◽

Cited By ~ 6

Author(s):

Andrew Burns ◽

W. Li ◽

C. Baker ◽

S.I. Shah

Keyword(s):

Thin Films ◽

Grain Size ◽

Anatase Phase ◽

Sol Gel ◽

Ionic Radii ◽

Si Substrates ◽

Gel Technique ◽

The Difference ◽

Sol Gel Synthesis

ABSTRACTNd doped TiO2 nanostructured thin films were prepared by sol-gel technique on quartz and Si substrates using TiCl4 precursor. As-deposited amorphous films were annealed to form anatase phase in the thin films. The film grain size increased with annealing temperature. Above 800°C, rutile began to segregate and the grain size decreased slightly.The photodegradation of 2-chlorophenol (2-CP) was studied. Doping TiO2 with Nd+3 reduced the photodegradation time. The difference in the ionic radii of Nd+3 and Ti+4 and the oxygen affinities of Nd and Ti were responsible for this effect. These differences help promote electron trapping, thereby increasing the lifetime of the holes which are responsible for the oxidation of 2-CP.

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