Effect of Sonication Time and Calcination Temperature on Physical Properties of Titanium Dioxide Synthesized via Sonochemical-Assisted Process

2013 ◽  
Vol 802 ◽  
pp. 252-256 ◽  
Author(s):  
Chokchai Kahattha ◽  
Naratip Vittayakorn ◽  
Wisanu Pecharapa
Keyword(s):  
Titanium Dioxide ◽  
Electron Microscope ◽  
Titanium Dioxide Nanoparticles ◽  
Anatase Phase ◽  
Titanium Isopropoxide ◽  
Treatment Temperature ◽  
Sonication Time ◽  
X Ray Diffraction ◽  
Calcination Process ◽  
Transmission Electron

Titanium dioxide nanoparticles (TiO2) were successfully synthesized via a sonochemical-assisted process using titanium isopropoxide as the titanium sources and calcination process at 300-500 °C. The effect of sonication time and heat treatment temperature on structural and nanostructure properties of the nanoparticles were characterized by X-ray diffraction (XRD), Raman spectroscopy, scanning electron microscope (SEM) and transmission electron microscope (TEM). The XRD and Raman results indicated that the crystalline of as-sonochemically synthesized TiO2 nanoparticles corresponded to anatase phase of TiO2 after sonication for 30 mim. The high quality crystalline anatase phase and increasing of crystalline size can be obtained after calcinations process.

scholarly journals Synthesis and Characterization of Titanium Dioxide Nanoparticles under Different pH Conditions

2018 ◽  
Vol 25 (1) ◽  
pp. 40-50
Author(s):  
Basma Abbas Abdulmajeed ◽  
Sameera Hamadullah ◽  
Fadhil Abed Allawi
Keyword(s):  
Titanium Dioxide ◽  
Titanium Dioxide Nanoparticles ◽  
Anatase Phase ◽  
Ammonium Hydroxide ◽  
Titanium Isopropoxide ◽  
X Ray Diffraction ◽  
Force Microscopy ◽  
Atomic Force ◽  
Size Growth ◽  
Ph Level

Ethanol as a solvent, a precursor of titanium isopropoxide and a stabilizer of either hydrochloric acid or ammonium hydroxide was used to prepare a titanium dioxide aqueous solution. The aqueous solutions with different values of pH and the morphology of the resultant reaction of the nanoparticles of titanium dioxide were investigated. The X-ray diffraction showed that at low temperatures and with acidic solutions, rutile structures are more favorable to grow on titanium dioxide synthesized, while at low and average temperatures and with base solutions, anatase phase is more pronounced. The crystalline form and the re-confirmation of the crystallite size growth were observed by the scanning electron microscopy. The atomic force microscopy was used to confirm the relation between the roughness and thickness with the pH level.  

scholarly journals Synthesis and characterization of gold nanoparticles on titanium dioxide for the catalytic photodegradation of 2,4-dichlorophenoxyacetic acid

2018 ◽  
Vol 16 (5) ◽  
Author(s):  
E. Romero Torres ◽  
M. Gutiérrez Arzaluz ◽  
V Mugica Alvarez ◽  
L. González Reyes ◽  
M. Torres Rodríguez ◽  
...  
Keyword(s):  
Gold Nanoparticles ◽  
Titanium Dioxide ◽  
Uv Light ◽  
Anatase Phase ◽  
Precipitation Method ◽  
Dichlorophenoxyacetic Acid ◽  
X Ray Diffraction ◽  
Transmission Electron ◽  
Average Size ◽  
2,4 Dichlorophenoxyacetic Acid

The photocatalytic degradation of 2,4-dichlorophenoxyacetic acid (2,4-D) using a Au/TiO2 catalyst and ultraviolet (UV) light energy source (9 mW/cm2) discussed. Gold nanoparticles were synthesized by controlled urea reduction and deposited on titanium dioxide (TiO2) by the deposition-precipitation method. The average size of the nanoparticles was 6-8 nm. X-ray diffraction (XRD) characterization confirmed that TiO2 was present in the anatase phase, whereas the presence and particle size of gold were determined by transmission electron microscopy (TEM). The results of the degradation showed that the activity of TiO2 was improved when Au nanoparticles were present on the surface. The reactions were performed at atmospheric pressure and room temperature.

Synthesis of Anatase/Brookite Mixtured TiO2 Nanoparticles by a Chimie Douce Technique

2013 ◽  
Vol 734-737 ◽  
pp. 2528-2531
Author(s):  
Yu Mei Gong ◽  
Qing Liang ◽  
Jing Guo ◽  
Hong Zhang ◽  
Fu Cheng Guan
Keyword(s):  
Electron Microscope ◽  
Anatase Phase ◽  
Spherical Shape ◽  
Nitrogen Adsorption ◽  
X Ray Diffraction ◽  
Average Pore ◽  
Specific Pore Volume ◽  
Transmission Electron ◽  
Bet Method ◽  
Ft Ir

Anatase/brookite mixtured TiO2nanoparticles have been synthesized by using a two-step process through a chimie douce technique. The as-prepared powders were characterized by Fourier transform infrared (FT-IR) spectra, X-ray diffraction (XRD), transmission electron microscope (TEM), scanning electron microscope (SEM), and a nitrogen adsorption apparatus in multipoint Brunauer-Emmett-Teller (BET) method. The results indicated that the TiO2nanoparticles were composed of biphasial anatase/brookite mixtures, 38% anatase phase formed in quasi-spherical shape and 62% brookite phase formed in nanorod shape. The specific surface area, the average pore diameter, and the specific pore volume were 100.06 m2/g, 14.0 nm, and 0.561 cm3/g, respectively.

Controlling Phase Composition, Properties and Activity of TiO2 Nano-Photocatalyst Synthesized by Hydrothermal Technique in the Degradation of Cinnamic Acid Solution

2020 ◽  
Vol 20 (9) ◽  
pp. 5418-5425
Author(s):  
Dien-Trung Nguyen ◽  
Cam-Anh Ha ◽  
Tri Nguyen
Keyword(s):  
Phase Composition ◽  
Cinnamic Acid ◽  
Photocatalytic Oxidation ◽  
Diffuse Reflectance Spectroscopy ◽  
Anatase Phase ◽  
Titanium Isopropoxide ◽  
Band Gap Energy ◽  
X Ray Diffraction ◽  
Transmission Electron ◽  
Composition Properties

In this work, titanium oxide catalysts were synthesized by the hydrothermal method from titanium isopropoxide (TTIP) as a precursor under acidic (Ti-A1 and Ti-A2), neutral (Ti-W) and alkaline (Ti-B) media. Characteristics of the catalysts were identified by various methods including X-ray diffraction, Fourier transform infrared spectroscopy, Brunauer–Emmett–Teller adsorption, UV-Vis diffuse reflectance spectroscopy, transmission electron microscopy, and Raman spectroscopy. The phase composition and PZC value of the obtained catalysts depended on the hydrothermal medium and the amount of TTIP: pure anatase and brookite phase formed at neutral and alkaline medium, respectively; whereas acidic medium favored the formation of anatase/rutile mixed phase and anatase phase decreased with the increasing amount of TTIP. The band gap energy of the synthesized catalysts was approximately 3.08–3.23 eV. Photocatalytic activity of synthesized catalysts was surveyed in the degradation of cinnamic acid (CA) solution at various pH in the region from 3.8 to 9.0 under UV irradiation. Photocatalytic oxidation was favorable in an acidic environment. At acidic pH values (3.8 and 5.0), the CA conversion was in the order of Ti-A2 ≥ Ti-A1 > Ti-P25 > Ti-W ≫ Ti-B, whereas it followed Ti-P25 > Ti-A1 > Ti-A2 ≈ Ti-W > Ti-B at pH 7.0 as well as pH 9.0.

scholarly journals Preparation and Characterization of Pd Modified TiO2 Nanofiber Catalyst for Carbon–Carbon Coupling Heck Reaction

2017 ◽  
Vol 2017 ◽  
pp. 1-13 ◽  
Author(s):  
Leah O. Nyangasi ◽  
Dickson M. Andala ◽  
Charles O. Onindo ◽  
Jane C. Ngila ◽  
Banothile C. E. Makhubela ◽  
...  
Keyword(s):  
Electron Microscope ◽  
Heck Reaction ◽  
Titanium Isopropoxide ◽  
X Ray Diffraction ◽  
Heck Reactions ◽  
H Nmr ◽  
Air Atmosphere ◽  
Highly Active ◽  
Tio2 Nanofiber ◽  
Transmission Electron

TiO2 fibers were prepared through electrospinning of poly methyl methacrylate (PMMA) and titanium isopropoxide (TIP) solution followed by calcination of fibers in air at 500°C. Cetyltrimethylammonium bromide (CTAB) protected palladium nanoparticles (Pd NPs) prepared through reduction method were successfully adsorbed on the TiO2 nanofibers (NF). Combined studies of X-ray diffraction (XRD), scanning electron microscope (SEM), and transmission electron microscope (TEM) indicated that the synthesized Pd/TiO2 had anatase. BET indicated that the synthesized TiO2 and Pd/TiO2 had a surface area of 53.4 and 43.4 m2/g, respectively. The activity and selectivity of 1 mol% Pd/TiO2 in the Heck reaction have been investigated towards the Mizoroki-Heck carbon–carbon cross-coupling of bromobenzene (ArBr) and styrene. Temperature, time, solvent, and base were optimized and catalyst was recycled thrice. 1H NMR and 13C NMR indicated that stilbene, a known compound from literature, was obtained in various Heck reactions at temperatures between 100°C and 140°C but the recyclability was limited due to some palladium leaching and catalyst poisoning which probably arose from some residual carbon from the polymer. The catalyst was found to be highly active under air atmosphere with reaction temperatures up to 140°C. Optimized reaction condition resulted in 89.7% conversions with a TON of 1993.4 and TOF value of 332.2 hr−1.

scholarly journals PENGARUH PELARUT TERHADAP KARAKTERISTIK NANOPARTIKEL TITANIUM DIOKSIDA (TiO2)

2017 ◽  
Vol 17 (1) ◽  
pp. 26
Author(s):  
Atik Setyani ◽  
Emas Agus Prastyo Wibowo
Keyword(s):  
Titanium Dioxide ◽  
Powder Diffraction ◽  
Titanium Dioxide Nanoparticles ◽  
Anatase Phase ◽  
Sol Gel ◽  
Rutile Phase ◽  
X Ray Diffraction ◽  
Nano Tio2 ◽  
X Ray ◽  
Tio2 Anatase

PENGARUH PELARUT TERHADAP KARAKTERISTIK NANOPARTIKEL TITANIUM DIOKSIDA (TiO2) ABSTRAK Tujuan penelitian ini adalah untuk membandingkan jenis pelarut dalam proses pembentukan nanopartikel titanium dioksida dengan metode sol gel. Hasil karakterisasi dengan X-Ray Diffraction (XRD) menunjukkan bahwa penggunaan pelarut berpengaruh terhadap kristalinitas dan fasa material yang terbentuk. Berdasarkan Joint Committee on Powder Diffraction Standards (JCPDS) card nomor 84-1286 menunjukkan difraktogram nano TiO2 hasil sintesis sebagian besar merupakan fasa anatas. Hal ini terlihat dari nilai 2 teta yang diperoleh yaitu 24,45˚; 47,29˚; 53,18˚; 61,64˚ untuk fasa anatas dan 54,65˚; 74,16˚ untuk fasa rutil. Hanya saja persentase fasa anatas pada nano TiO2 menggunakan pelarut metanol lebih besar jika dibandingkan dengan hasil nano TiO2 dengan pelarut etanol. Berdasarkan perhitungan ukuran partikel nano TiO2 menggunakan persamaan Debye- Scherer didapatkan ukuran nano TiO2 menggunakan metanol sebesar 13.78 nm sedangkan  nano TiO2 menggunakan etanol sebesar 34.26 nm. Kata Kunci: Pelarut, sol-gel, titanium dioksida   EFFECT OF SOLVENTS ON THE CHARACTERITICS OF NANOPARTICLES TITANIUM DIOXIDE (TiO2) ABSTRACTThe purpose of this study was to compare the type of solvent in the process of formation of titanium dioxide nanoparticles with sol gel method. X-Ray Diffraction (XRD) characterization results indicate that the use of solvent effect on crystallinity and phase material formed. Based Joint Committee on Powder Diffraction Standards (JCPDS) 84-1286 card numbers show diffractogram nano TiO2 synthesized largely a anatas phase. This can be seen from a value of 2 theta obtained by the 24,45˚; 47,29˚; 53,18˚; 61,64˚ to phase anatas and 54,65˚; 74,16˚ for rutile phase. Only a small percentage of the nano TiO2 anatase phase using methanol solvent is greater when compared with the results of nano TiO2 with ethanol. Based on the calculation of nano TiO2 particle size using equation Debye- Scherer obtained nanosized TiO2 using methanol amounted to 13.78 nm while the nano TiO2 using ethanol amounted to 34.26 nm. Keywords: Solvent, sol-gel, titanium dioxide

Fabrication of Ytterbium-Doped Titanium Dioxide Nanoparticles Using Collagen as Template

2013 ◽  
Vol 873 ◽  
pp. 183-187
Author(s):  
Yi Wu Liu ◽  
Bi Wang ◽  
Bing Wei Luo ◽  
Qian He
Keyword(s):  
Titanium Dioxide ◽  
Titanium Dioxide Nanoparticles ◽  
Metal Oxide Nanoparticles ◽  
X Ray Diffraction ◽  
X Ray ◽  
High Crystallinity ◽  
Transmission Electron ◽  
Ft Ir ◽  
Doped Titanium Dioxide ◽  
Ytterbium Doping

Yb-doped titanium dioxide nanoparticles were synthesized using collagen as the template, and characterized by means of X-ray diffraction (XRD), transmission electron microscopy (TEM), UV-Vis spectrophotometry, and Fourier transform infrared (FT-IR) spectra. The effect of doping concentration and calcination temperature on structure of TiO2was discussed. The results showed the Yb-TiO2nanoparticles have high crystallinity with the size of 18-28 nm. Ytterbium doping could inhibit the phase transformation from anatase to rutile of TiO2, reduce the crystallite size, improve thermal stability, and improve the light absorption. This study indicates that collagen could be used as an ideal biological template to prepare metal oxide nanoparticles with high crystallinity.

Luminescent Properties of Gd2MoO6:Eu3+ Nanophosphor for WLEDs

2021 ◽  
Author(s):  
Yan Chen ◽  
Yuemei Lan ◽  
Dong Wang ◽  
Guoxing Zhang ◽  
Wenlong Peng ◽  
...  
Keyword(s):  
Electron Microscope ◽  
Transmission Electron Microscope ◽  
Fluorescence Spectra ◽  
Solvothermal Method ◽  
Luminescent Properties ◽  
X Ray Diffraction ◽  
X Ray ◽  
Transmission Electron

A series of Gd2-xMoO6:xEu3+(x=0.18-0.38) nanophosphors were synthesized by the solvothermal method. The properties of this nanophosphor were characterized by x-ray diffraction (XRD), transmission electron microscope (TEM), fluorescence spectra and diffuse...

scholarly journals Microscopic study of zinc nanoparticles synthesised using thermosetting polymer

2019 ◽  
Vol 49 (1) ◽  
Author(s):  
Giriraj Tailor ◽  
Jyoti Chaudhay ◽  
Deepshikha Verma ◽  
Bhupendra Kr. Sarma
Keyword(s):  
Electron Microscope ◽  
Xrd Analysis ◽  
The Novel ◽  
X Ray Diffraction ◽  
Zinc Nanoparticles ◽  
Transmission Electron ◽  
Sem Study ◽  
Zinc Salts ◽  
Thermosetting Polymer ◽  
Low Crystalline

AbstractThe present study reports the novel synthesis of Zinc nanoparticles (Zn NPs) by thermal decomposition method and its characterisation by Scanning Electron Microscope (SEM), Transmission Electron Microscope (TEM), and X-ray Diffraction Measurements (XRD). Synthesis of Zn NPs was achieved by using thermosetting polymer and zinc salts as precursor. Zn NPs were obtained on calcination at 850 °C for 30 min. SEM study reveals that synthesized nanoparticles are spherical in shape. XRD analysis shows that the Zn NPs formed are low crystalline in nature.

Formation of Graphite Encapsulated Nickel Nanoparticles by Ball Milling and Annealing of Expanded Graphite with Nickel

2011 ◽  
Vol 80-81 ◽  
pp. 217-220 ◽  
Author(s):  
Xue Qing Yue ◽  
Hai Jun Fu ◽  
Da Jun Li
Keyword(s):  
Electron Microscope ◽  
Ball Milling ◽  
Transmission Electron Microscope ◽  
Nickel Nanoparticles ◽  
Size Range ◽  
Expanded Graphite ◽  
X Ray Diffraction ◽  
X Ray ◽  
Nickel Powders ◽  
Transmission Electron

Graphite encapsulated nickel nanoparticles were prepared by ball milling andsubsequently annealing a mixture of expanded graphite with nickel powders. The products were characterized by transmission electron microscope and X-ray diffraction. The formation mechanism of the products was discussed. Results show that the products have a size range of 20-150 nm. The graphite and nickel in the products all exhibit a high crystallinity.

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