Ionic Liquid – Assisted Synthesis and Characterization of Cerium Oxide Nanocubes for Degradation of Methylene Blue

2014 ◽  
Vol 625 ◽  
pp. 164-167
Author(s):  
Mohd Aliff Irham Md. Azhar ◽  
Sujan Chowdhury ◽  
Pradip Chandra Mandal ◽  
Muhd Fahmi Daman ◽  
Sekhar Bhattacharjee ◽  
...  
Keyword(s):  
Methylene Blue ◽  
Ionic Liquid ◽  
Cerium Oxide ◽  
Treatment Method ◽  
Acetate Anion ◽  
X Ray Diffraction ◽  
Transmission Electron ◽  
Different Types ◽  
Average Size

Cerium Oxide (CeO2) nanocubes are synthesized by using hydrothermal treatment method in the presence of four different types of ionic liquid such as acetate anion, phosphate anion, and dicyanamide anion. Ceria nanocubes has been consisted with average size of 16 to 31 nm in diameter and characterized by transmission electron microscope (TEM), X-ray diffraction (XRD), and surface analyzer and porosimetry analysis (ASAP). Ceria nanocubes have higher photocatalytical ability in the degradation of methylene blue as compared to commercial ceria nanoparticles which are confirmed through ultraviolet-visible spectroscopy (UV/Vis).

Morphology Controlled Ionothermal Synthesis and Characterization of Ceria Nanomaterials

2014 ◽  
Vol 1024 ◽  
pp. 112-115
Author(s):  
Yi Tong Lee ◽  
Sujan Chowdhury ◽  
Mohamad Azmi Bustam ◽  
Mohammed Ibrahim Abdul Mutalib ◽  
Muti Mohamed Norani
Keyword(s):  
Electron Microscopy ◽  
Ionic Liquid ◽  
Cerium Oxide ◽  
Treatment Method ◽  
Treatment Temperature ◽  
Nitrate Hexahydrate ◽  
Acetate Anion ◽  
Irregular Structures ◽  
Transmission Electron ◽  
Average Size

Crystalline ceria nanomaterials have been successfully synthesized through ionothermal treatment method. Morphology of the ceria nanoparticles are confirmed with scanning electron microscopy (SEM), transmission electron microscopy (TEM) with an average size of 6-30 nm and with the N2adsoprtion-desorption technique in the range of 46-62 m2g-1in the presence of ionic liquid as base on acetate anion, trifluoroacetate anion, dicyanamide anion as organic linker, cerium nitrate hexahydrate as precursor and ammonia. It was found that the cerium oxide synthesized by acetate anion based ionic liquid has cube shape morphology and gradually form belt shape as elevated the hydrothermal treatment temperature. Cerium oxide synthesized by trifluoroacetate anion based ionic liquid remains its cubic morphology even at elevated temperature. Whereas, cerium oxide synthesized by dicyanamide anion based ionic liquid, ceria particles agglomerate and form irregular structures. The synthesized ceria nanocrystals show better performance for the degradation of methylene blue.

Synthesis and Characterization of Cu2FeSnS4 Semiconductor Nanocrystals with Zincblende Structure

2012 ◽  
Vol 512-515 ◽  
pp. 2019-2022 ◽  
Author(s):  
Xiao Lu Liang ◽  
Xian Hua Wei
Keyword(s):  
Random Distribution ◽  
Semiconductor Nanocrystals ◽  
Synthesis And Characterization ◽  
X Ray Diffraction ◽  
X Ray ◽  
Selected Area Electron Diffraction ◽  
Transmission Electron ◽  
Nir Absorption ◽  
Average Size

Cu2FeSnS4semiconductor nanocrystals with zincblende structure have been successfully synthesized by a hot-injection approach. Cu+, Fe2+, and Sn4+cations have a random distribution in the zincblende unit cell, and the occupancy possibilities are 1/2, 1/4 and 1/4, respectively. Those nanocrystals were characterized by means of X-ray diffraction (XRD), transmission electron microscopy (TEM), selected area electron diffraction (SAED), energy dispersive spectroscopy (EDS), and UV-Vis-NIR absorption spectroscopy. The Cu2FeSnS4 nanocrystals have an average size of 7.5 nm and a band gap of 0.92 eV.

Preparation of Nanosized TiO2 Synthesized by Sol-Gel Pathway Using Ionic Liquid as Assistant and its Photocatalytic Activities

2012 ◽  
Vol 535-537 ◽  
pp. 2240-2244
Author(s):  
Wei Wei ◽  
Chang Shun Yu ◽  
Shao Jun Wang ◽  
Qing Da An
Keyword(s):  
Ionic Liquid ◽  
Diffuse Reflectance ◽  
Sol Gel ◽  
Rutile Phase ◽  
X Ray Diffraction ◽  
X Ray ◽  
Transmission Electron ◽  
Photocatalytic Activities ◽  
Average Size ◽  
Nanosized Tio2

Nanosized TiO2 particles were synthesized by sol-gel method using ionic liquid as assistant. The samples were characterized by UV-vis diffuse reflectance spectra, X-ray diffraction (XRD), transmission electron microscopy (TEM). It was shown that the phase detectable was mainly rutile phase with uniform sphericity and the average size was 10nm. Along with the rise of sintering temperature, grain diameter became bigger. The photocatalytic activities of nanosized TiO2 were evaluated by the reduction yield in the presence of CO2 and water. The result showed that TiO2 catalysts has efficient photocatalytic activities, of which made with [OMIM]BF4 displayed the highest photocatalytic active in the experiment.

Synthesis and Characterization of CeO2 Nanoparticles

2016 ◽  
Vol 683 ◽  
pp. 281-287 ◽  
Author(s):  
Ivan N. Lapin ◽  
Anastasiia V. Shabalina ◽  
Valery Svetlichnyi
Keyword(s):  
Cerium Oxide ◽  
Ethanol Solution ◽  
Nanocrystalline Powders ◽  
X Ray Diffraction ◽  
Active Components ◽  
X Ray ◽  
Average Size ◽  
First Time ◽  
Metallic Target

Dispersions of cerium oxide nanoparticles in water, ethanol, and water-ethanol solution were synthesized for the first time using laser ablation of metallic target. The fundamental harmonic of nanosecond Nd:YAG laser was used. Nanocrystalline powders of cerium oxide were obtained from the dispersions. The average size of the crystallites was 17-19 nm. Phase composition of nanoparticles was confirmed by X-ray diffraction and Raman spectroscopy. It was found that carbon present on the surface of CeO2 particles. The materials obtained may be used as catalyst carriers for CO oxidation, and as active components of sunscreen cosmetic products.

Low-temperature synthesis and characterization of GaN nanocrystals from gallium trichloride precursor

2004 ◽  
Vol 19 (12) ◽  
pp. 3484-3489 ◽  
Author(s):  
F.S. Liu ◽  
Q.L. Liu ◽  
J.K. Liang ◽  
G.B. Song ◽  
L.T. Yang ◽  
...  
Keyword(s):  
Single Phase ◽  
Crystal Size ◽  
Broad Emission Band ◽  
Band Edge Emission ◽  
X Ray Diffraction ◽  
Low Temperature Synthesis ◽  
Transmission Electron ◽  
Gallium Trichloride ◽  
Average Size

Gallium nitride (GaN) has been synthesized by reacting gallium trichloride with ammonia (NH3) at low temperatures ranging from 500 to 1000 °C for 12 h. X-ray diffraction, transmission electron microscopy, infrared, and Raman backscattering spectra revealed that the synthesized GaN powder consists of single-phase nano-sized crystallites with the wurtzite-type structure. The average size of the crystals decreases with the reaction temperature from approximately ∼63 nm at 1000 °C to ∼5 nm at 500 °C. GaOCl and ϵ–Ga2O3 are the intermediate products during synthesis of the GaN. Characteristic shifts of the Raman peaks are associated with the change in crystal size. The band-edge emission of GaN at 361 nm was observed on room temperature photoluminescence spectra exclusively for the sample synthesized at 1000 °C, while a new and broad emission band appeared with the center ranging from 827 to 765 nm for the samples synthesized between 500 and 800 °C.

Synthesis and Characterization of Antimony Doped Tin Oxide Conductive Nanoparticles by Alkoxide Hydrolysis Method

2013 ◽  
Vol 702 ◽  
pp. 167-171 ◽  
Author(s):  
Fu Liang Zhu ◽  
Yan Shuang Meng
Keyword(s):  
Tin Oxide ◽  
Raw Materials ◽  
Volume Resistivity ◽  
Nano Particles ◽  
X Ray Diffraction ◽  
Hydrolysis Method ◽  
Optimum Parameters ◽  
Transmission Electron ◽  
Average Size

Antimony doped tin oxide (ATO) conductive nano-particles are synthesised by alkoxide hydrolysis method using SnCl4•5H2O and SbCl3 as raw materials. The optimum parameters are determined as: Sb3+ doped molar concentration 15%, reaction temperature 60°C and roasting temperature 600°C. Under optimum conditions, the synthesised nano-particles are characterized by means of X-ray diffraction (XRD) and transmission electron microscope (TEM). XRD results show that all Sb ions came into the SnO2 lattice to substitute Sn ions. The image of TEM shows the ATO conductive nano-particles average size is 5 nm. Volume resistivity lowest value of ATO nano-particles is 141 Ω•cm.

Synthesis and Characterization of CoMn2O4 Nanopowders by a Reverse Micelle Processing

2016 ◽  
Vol 868 ◽  
pp. 105-110
Author(s):  
Dong Sik Bae
Keyword(s):  
Reverse Micelle ◽  
Molar Ratio ◽  
Synthesis And Characterization ◽  
X Ray Diffraction ◽  
X Ray ◽  
Xrd Diffraction ◽  
Transmission Electron ◽  
Diffraction Patterns ◽  
Average Size

CoMn2O4 nanoparticles were synthesized by reverse micelle processing from the mixed precursor (consisting of Co (NO3)2 ·6H2O and MnCl2·4H2O). The CoMn2O4 was prepared by mixing the aqueous solution at a molar ratio of Co : Mn = 1 : 2. The synthesized powders were calcined at 600°C for 2h. The average size and distribution of synthesized powders were in the range of 10-20nm and narrow, respectively. The average size of the synthesized powders increased with increasing water to surfactant molar ratio. The XRD diffraction patterns show that the phase of CoMn2O4 was spinel (JCPDS no.77-0471). The synthesized and calcined powders were characterized by thermogravimetry-differential scanning calorimeter (TG-DSC), X-ray diffraction analysis (XRD) and transmission electron microscopy (TEM). The magnetic property of the powder was measured by Vibrating Sample Magneto-meter (VSM) at 298K. The effect of synthesis parameter, such as the molar ratio of water to surfactant, is discussed.

Ultrasonic-hydrothermal Synthesis and Characterization of Mesoporous Anatase TiO2 Microspheres

2011 ◽  
Vol 239-242 ◽  
pp. 2323-2326 ◽  
Author(s):  
Hai Bin Li ◽  
Shu Guang Chen ◽  
Wei Ming Lu ◽  
Qi Cheng Liu
Keyword(s):  
Diffuse Reflectance Spectroscopy ◽  
Tetrabutyl Titanate ◽  
X Ray Diffraction ◽  
Structure Directing Agent ◽  
X Ray ◽  
Transmission Electron ◽  
Uv Visible ◽  
Average Size ◽  
Adsorption Desorption

Mesoporous TiO2 microspheres with a combination of large surface and high crystallinity were fabricated by an ultrasonic-hydrothermal method with Octadecylamine as a structure-directing agent and tetrabutyl titanate as a precursor. The mesoporous materials were characterized by X-ray diffraction (XRD), transmission electron microscopy (TEM), N2 adsorption–desorption measurements, and UV–visible diffuse reflectance spectroscopy (UV-vis). Low-angle XRD and TEM images indicated that the disordered wormhole-like mesoporous architecture of TiO2 microspheres with diameters of about 200-400 nm were actually formed by agglomerization of nanoparticles with an average size of about 10nm. The analysis from N2 adsorption–desorption isotherms showed that the surface area of mesoporous sample was 204.7 m2g-1, with a pore size of 4.3 nm and pore volume of 0.263 cm3g-1 after calcined at 673 K.

Surfactant-Assisted Hydrothermal Synthesis and Characterization of Nano-Sized 2H-MoS2

2011 ◽  
Vol 694 ◽  
pp. 113-117
Author(s):  
Jun Zhang ◽  
Xin Li ◽  
Yu Li Feng ◽  
Bo Xu ◽  
Yan Hui Guo
Keyword(s):  
Hexagonal Phase ◽  
Sodium Molybdate ◽  
X Ray Diffraction ◽  
Hydrothermal Temperature ◽  
X Ray ◽  
Transmission Electron ◽  
Ft Ir ◽  
Average Size ◽  
Surfactant Assisted

Nano-sized molybdenum disulfide has been prepared by hydrothermal method via surfactant and ultrasonic assistance, using sodium molybdate and thiourea as reagents. The as-synthesized MoS2 samples were characterized by x-ray diffraction (XRD), Fourier transform infrared spectroscopy (FT-IR), and transmission electron microscope (TEM); the effects of addition of CTAB on reaction process and resulted particles have been investigated in detail. It has been shown that the addition of CTAB can not only prevent the agglomeration of the particles, but regulate their morphologies and phase compositions. The resulting 2H-MoS2 with hexagonal phase and average size of 10-20nm can be directly obtained at low hydrothermal temperature needless of high-temperature sintering and inert gas protection.

Preparation, Characterization of N-Ti-MCM-22 Molecular Sieve and its Photocatalytic Properties

2012 ◽  
Vol 602-604 ◽  
pp. 205-208
Author(s):  
Yue Cheng ◽  
Xiao Yuan Su
Keyword(s):  
Electron Microscopy ◽  
Transmission Electron Microscopy ◽  
Methylene Blue ◽  
High Pressure ◽  
Liquid Phase ◽  
Molecular Sieve ◽  
X Ray Diffraction ◽  
X Ray ◽  
Transmission Electron

Nanocrystalline N-doped and Ti-containing MCM-22 catalyst was synthesized by the static hydrothermal method, using sodium azide as nitrogen source for doping, and tetra-n-butyl titanate [Ti(OC4H9)4] as precursors of TiO2. The catalysts were characterized by X-ray diffraction, transmission electron microscopy, and energy-dispersive spectroscopy.During liquid phase photocatalytic degradation of methylene blue (MB) under high-pressure Hg arc lamp irradiation, the asprepared N-doped Ti-MCM-22 exhibited much higher activity than the undoped Ti-MCM-22, attributed to the effect of nitrogen dopant.

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