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Query: KEGG:D01931 (TiO2)
 11,320 document(s) hit in 31,850,051 MEDLINE articles (0.00 seconds)

This paper studied preparing photocatalyst supported on natural clinoplilolite, photocatalysis degrading to methyl orange solution as photocatalysis function test, solar as light resource, explored the synthesize condition and affect factors of its catalysis activity. The capability of catalyst was evaluated by decolor rate and COD removal rate. The samples was described by XRD, IR and specific surface area. Studied result showed that catalyst prepared by combination of tetrabutyl titanate and natural clinoplilolite dryed under 120 degrees C for 6 hours then calcined under 200 degrees C had the best photocatalysis activity. Degrading rate of methyl orange solution increased with the quantity of TiO2/zeolite and additional oxidant H2O2 increasing, but superfluous H2O2 can also restrain the photocatalysis activity of titanium dioxide supported on clinoplilolite. Methyl orange solution had the best degrading rate as pH value between 2 to 5.
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PMID:[Photocatalysis characterization of titanium dioxide supported on natural clinoplilolite]. 1455 69

A series of TiO2-MoO3 nano-composite photocatalysts were prepared by supercritical fluid dry method (SCFD) and an impregnation technique with TiCl4 and (NH4)6Mo7O24.4H2O as the starting materials. The catalysts were characterized by the means of XRD, TEM and UV-Vis. Methyl orange was used as model compound for the evaluation of their catalytic activities. The results indicated that the photo-catalyst prepared by SCFD had the advantages of small size (12.84 nm), narrow distribution and good dispersivity. The presence of small amount of Mo in composite catalyst gives rise to the red shift of its absorbance wavelength, decrease of its energy gap and increase of the utility of visible light. Furthermore, higher surface acidity of the photo-catalyst was obtained as the result of the addition of MoO3. Compared with pure TiO2, the catalytic activity of the TiO2-MoO3 nano-composite photo-catalyst was improved significantly. As the doping concentration of the composite catalysts was controlled at 0.6% (molar percentage), 100% degradation of methyl orange was achieved with in 1.2 h irradiation time.
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PMID:Preparation of TiO2-MoO3 nano-composite photo-catalyst by supercritical fluid dry method. 1629 20

In the present paper, ordered mesoporous silica (KIT-6) as support, nanosized TiO2 into KIT-6 was synthesized by titanium tetraisopropoxide hydrolysis. Then silver was loaded by deposition-precipitation method. Ag-TiO2/KIT-6 composite nanosized photocatalyst was firstly synthesized and a series of correlated catalysts were synthesized by the same preparation method. Methyl orange is presently adopted as a representative organic pollutant to evaluate the photocatalytic performance of the as-synthesized catalysts. The order of photocatalytic activity of the as-synthesized samples was found as Ag-TiO2/KIT-6 > Ag/TiO2 > TiO2/KIT-6 > TiO2 > Ag/KIT-6. Detailed characterizations were conducted by techniques including XRD, N2 physical adsorption, XPS, UV-Vis DRS and TEM. It was found that the Ag-TiO2 /KIT-6 sample shows the highest photocatalytic activity, which should be attributed to the Ag-TiO2 heterojunction structure and higher BET surface area of the Ag-TiO2/KIT-6 sample. Ag-TiO2 heterojunction improves the separation of photogenerated electron-hole pairs, thus enhancing the photocatalytic activity; Ag-TiO2/KIT-6 sample possesses high BET surface area, which facilitates adsorption and transportation of dye molecules, also leading to higher photocatalytic activity.
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PMID:[Studies on Ag-TiO2/KIT-6 composite nanosized photocatalyst]. 1983 31

In the following study we present an easy and scalable method for the synthesis of Rutile Titanium Dioxide (TiO2) nano-rods by using bulk TiO2 powder, Sodium Hydroxide (NaOH), distilled water and ethanol. We demonstrated the effects of concentration on the size, morphology and band gap of the finally obtained nanostructures. X-ray diffraction pattern (XRD) studies indicated that the samples were crystalline and were free from any impurities with a little hint of anatase at the lower concentrations and the average crystal size ranges between 20 nm to 41 nm, FESEM studies revealed that nano structures are rod like. Further UV-Visible Spectroscopy and Raman studies were conducted of the prepared samples and the band gap of the samples was found to be ranging from 3.5 eV to 3.8 eV. The photo-catalytic degradation of methyl orange was done by the sample prepared in the presence of UV source and was compared with the degrading capacity of bulk TiO2 and was inferred that the Methyl orange is degraded much efficiently with the use of the synthesized sample. The central feature of the presented approach being the use of simple technique and instruments like hot plate, economical and easily accessible chemical like NaOH as a reactant, and a facilitator for the growth of nano-rods and with the reaction being carried out at very low temperatures and less reaction times makes this technique highly feasible for being used in mass production of Rutile TiO2 nano-rods and the fact that the morphology and size can be tuned by varying the concentration of the NaOH.
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PMID:Effect of concentration on the growth of rutile TiO2 nanocrystals. 2595 67

This work reports a facile and green synthesis of Ag/TiO2 nanocomposite by extract of leaves of Euphorbia heterophylla without any stabilizer or surfactant. The green synthesized Ag/TiO2 nanocomposite was characterized by field emission scanning electron microscope (FESEM), energy-dispersive X-ray spectroscopy (EDS), fourier-transform infrared (FT-IR) spectroscopy, X-ray diffraction analysis (XRD) and UV-vis. The Ag/TiO2 nanocomposite was found to be effective catalyst for reduction of various dyes, such as 4-nitrophenol (4-NP), Methyl orange (MO), Congo red (CR) and Methylene blue (MB) in the presence of NaBH4 in water at room temperature. Catalysis reactions were monitored by employing UV-vis spectroscopy. Catalysis reactions followed pseudo-first order rate equation. The catalyst can be recovered and reused several times without significant loss of its catalytic activity.
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PMID:Euphorbia heterophylla leaf extract mediated green synthesis of Ag/TiO2 nanocomposite and investigation of its excellent catalytic activity for reduction of variety of dyes in water. 2646 45