Study on Structure and Photocatalytic Properties of Cu2O Nanocrystal Synthesized by Low Temperature Liquid-Phase Method

2013 ◽  
Vol 743-744 ◽  
pp. 623-628
Author(s):  
Ying Chao Liu ◽  
Jin Bo Xue ◽  
Cheng Zhong Chi ◽  
Wei Liang ◽  
Guang Liang Li
Keyword(s):  
Low Temperature ◽  
Copper Acetate ◽  
Sewage Treatment ◽  
Alkaline Condition ◽  
Phase Method ◽  
X Ray Diffraction ◽  
Copper Acetate Monohydrate ◽  
Liquid Phase Method ◽  
Temperature Liquid ◽  
Pure Cu

Spherical and octahedral Cu2O nanocrystals were prepared by reducing copper acetate monohydrate (Cu (CH3COO)2·H2O) with hydrazine hydrate (N2H4·H2O) at ambient temperature and pressure. The influence of solution composition on the morphology and microstructure of Cu2O nanocrystals were investigated by scanning electron microscopy (SEM) and X-ray diffraction (XRD). Ultraviolet and visible light spectrometer (UVvis) was employed to investigate the photocatalysis behavior of the Cu2O samples. The results show that Cu (OH)2 was initially formed with the addition of NaOH and then reduced into Cu2O by N2H4·H2O. At the same time, a portion of Cu2O particles were further reduced to Cu, but the increasing of O2 contents in the solution under vigorous stirring reconvert Cu into Cu2O whichlead to the formation of pure Cu2O nanocrystals. The alkaline condition which provided by NaOH was the prerequisite for obtaining spherical and octahedral Cu2O crystals. The facile method was provided to fabricate Cu2O nanocrystals with outstanding photocatalysis performance at low temperature, which may play an important role in sewage treatment and organic pollutants decomposition.

Synthesis of MoO3 Nanostructures and their Photocatalytic Properties

2012 ◽  
Vol 535-537 ◽  
pp. 345-348 ◽  
Author(s):  
Zhi Ri Yu ◽  
De Qing Chu ◽  
Qiu Hong Li ◽  
Li Min Wang
Keyword(s):  
Decomposition Method ◽  
Molybdenum Trioxide ◽  
Phase Method ◽  
X Ray Diffraction ◽  
Excellent Performance ◽  
X Ray ◽  
Fourier Transformed Infrared Spectroscopy ◽  
Liquid Phase Method ◽  
Temperature Liquid ◽  
Degradation Properties

Different morphologies of molybdenum trioxide have been synthesized via low-temperature liquid phase method, hydrothermal synthesis and the direct decomposition method. Fourier transformed infrared spectroscopy (FTIR), X-ray diffraction (XRD) and scanning electron microscope (SEM) were employed to characterize the as-synthesized products and the photo catalytic degradation properties were studied for different nitrogen of dyes. The results indicate that the discoloration rate of methylene red was the best and it could be more than 90 percent in the same conditions. Therefore, the synthesized MoO3 powder is a kind of photocatalayst with excellent performance.

TiO2 Supported on Crude Sepiolite by Liquid Phase Method

2010 ◽  
Vol 96 ◽  
pp. 251-256
Author(s):  
Xiao Yan Wang ◽  
Zhi Jiang Ji ◽  
Jing Wang ◽  
Hai Jian Li
Keyword(s):  
Hydroxyl Radical ◽  
Electron Microscope Study ◽  
Phase Method ◽  
Natural Light ◽  
X Ray Diffraction ◽  
Scanning Electron Microscope Study ◽  
X Ray ◽  
Liquid Phase Method ◽  
Spin Resonance ◽  
Scanning Electron

TiO2 was supported on crude sepiolite by boiling reflux method. According to the X-ray diffraction, TiO2 is rutile-anatase mixing type while the composite prepared by the same method is rutile crystal. Scanning electron microscope study shows that TiO2 balls grow onto fibrous sepiolite like strings of grapes. The binding energy of Ti2p becomes 0.2eV lower in the composite. The photocatalytic performances are evaluated through studying the ability of generating hydroxyl radical（•OH）by electron spin resonance(ESR), and the decomposition rate of methyl orange in aqueous solution. It is found that the quantity of hydroxyl radical increases and the photocatalytic activity is enhanced for TiO2/sepiolite composite under natural light.

Impact of Sr on the performance of BaTi0.9Zr0.1O3–BaTiO3 dielectric powders

2014 ◽  
Vol 28 (14) ◽  
pp. 1450114 ◽  
Author(s):  
Jing Wang ◽  
Guijuan Rong ◽  
Tingwei Wang ◽  
Hao Yao
Keyword(s):  
Dielectric Constant ◽  
Breakdown Strength ◽  
Dielectric Material ◽  
Phase Method ◽  
X Ray Diffraction ◽  
Liquid Phase Method ◽  
Dielectric Performance ◽  
Composition Inhomogeneity ◽  
Tan Δ ◽  
Constant Maximum

BaTi 0.9 Zr 0.1 O 3– Ba 1-x Sr x TiO 3 fine-powders are synthesized by two-step liquid phase method. Phase analysis and microstructure evaluation conducted by X-ray diffraction and scanning electron microscopy confirm the perovskite structure of the ceramic grain. Different Sr content is considered to optimize the density and dielectric performance. The dielectric constant increases and dielectric loss decreases with the rising of Sr content until x = 0.05. At the doping content of 5%, the dielectric constant maximum of 42,430 and excellent Y5V dielectric material can be obtained due to composition inhomogeneity and compact properties. Its dielectric properties are as follows: ε RT = 36,914, tan δ < 0.09, ΔC/C 20° C at -30° C and 80°C are -58.98% and 14.94%, respectively, and the breakdown strength Eb ≥ 5.2 kV ⋅ mm -1.

scholarly journals Synthesis of CuO Nano structure via Sol-Gel and Precipitation Chemical Methods

2017 ◽  
Vol 12 (4) ◽  
pp. 126-131 ◽  
Author(s):  
Saja Mohsen Jabbar
Keyword(s):  
Sodium Hydroxide ◽  
Copper Chloride ◽  
Sol Gel ◽  
Copper Acetate ◽  
Precipitation Method ◽  
X Ray Diffraction ◽  
Nano Structure ◽  
Copper Acetate Monohydrate ◽  
Sol Gel Process ◽  
Ft Ir

CuO nanoparticles were synthesized in two different ways, firstly by precipitation method using copper acetate monohydrate Cu(CO2CH13)2·H2O, glacial acetic acid (CH3COOH) and sodium hydroxide(NaOH), and secondly by sol-gel method using copper chloride(CuCl2), sodium  hydroxide (NaOH) and ethanol (C2H6O). Results of scanning electron microscopy (SEM) showed that different CuO nanostructures (spherical and Reef) can be formed using precipitation and sol- gel process, respectively, at which the particle size was found to be less than 2 µm. X-ray diffraction (XRD)manifested that the pure synthesized powder has no inclusions that may exist during preparations. XRD results showed the particles size of highest peak at 38.9°, was  equal to (15.93nm). In addition, Fourier transform infrared spectroscopy (FT-IR) were used to describe the prepared CuO nanostructures absorption peak at 610 cm-1 which confirms that the synthesized product is a pure CuO and may be attributed to Cu2O infrared active mode.

Low-temperature NO reduction with NH3 over Mn–CeOx/CNT catalysts prepared by a liquid-phase method

2014 ◽  
Vol 4 (6) ◽  
pp. 1738-1741 ◽  
Author(s):  
Xie Wang ◽  
Yuying Zheng ◽  
Zhe Xu ◽  
Yi Liu ◽  
Xiaoli Wang
Keyword(s):  
Liquid Phase ◽  
Low Temperature ◽  
No Reduction ◽  
Phase Method ◽  
Liquid Phase Method

Mn–CeOx/CNTs prepared by a liquid-phase method showed excellent low-temperature activity for NO reduction with NH3.

scholarly journals Low-temperature expanded graphite for preparation of graphene sheets by liquid-phase method

2009 ◽  
Vol 188 ◽  
pp. 012040 ◽  
Author(s):  
Sha Jin ◽  
Lin-sheng Xie ◽  
Yu-lu Ma ◽  
Jing-jie Han ◽  
Zhang Xia ◽  
...  
Keyword(s):  
Liquid Phase ◽  
Low Temperature ◽  
Expanded Graphite ◽  
Phase Method ◽  
Graphene Sheets ◽  
Liquid Phase Method

Effects of using the liquid phase method on the physicochemical, mechanical, and bioactivity properties of hydroxyapatite/calcium aluminate bioceramic nanocomposites

2018 ◽  
Vol 7 (2) ◽  
pp. 122-131 ◽  
Author(s):  
Batool Reyhaniyan Zavareh ◽  
Alireza Salehirad ◽  
Saeed Mirdamadi
Keyword(s):  
Compressive Strength ◽  
Liquid Phase ◽  
Flexural Strength ◽  
Calcium Aluminate ◽  
Phase Method ◽  
X Ray Diffraction ◽  
X Ray ◽  
Liquid Phase Method ◽  
Physical Density ◽  
Spark Plasma

AbstractIn this research, 80 wt.% hydroxyapatite (HA)/20 wt.% calcium aluminate (CA) bioceramic nanocomposites were synthesized by using three liquid phase green methods. X-ray diffraction, energy dispersive X-ray spectroscopy, and field emission-scanning electron microscopy were conducted for the characterization of nanocomposites. To study the mechanical (compressive strength, flexural strength, and hardness) and physical (density, porosity, and water adsorption) properties of nanocomposites, these materials were sintered by spark plasma technique, after which the desired properties were measured. To study the bioactivity of samples, SBF vitro test was used. After reviewing the obtained data, results showed that the bioactivity and mechanical properties of the synthesized HA/NA nanocomposites were improved compared with those of the nano-components that form them and those of similar micro-scale composites. The measured maximum compressive strength, flexural strength, and hardness of the synthesized nanocomposites were 440 MPa, 137 MPa, and 202HV, respectively. The corresponding amounts for hydroxyapatite nanoparticles were 350 MPa, 115 MPa, and 124HV, respectively.

Preparation and Properties of the ZnO Nanopowder with Chemical Liquid-Phase Method

2011 ◽  
Vol 412 ◽  
pp. 9-12
Author(s):  
Zhong Zhou Yi ◽  
Bo Wang ◽  
Feng Rui Zhai ◽  
Zhi Peng Xie
Keyword(s):  
Liquid Phase ◽  
Precursor Solution ◽  
Water Soluble ◽  
Phase Method ◽  
X Ray Diffraction ◽  
Soluble Polymer ◽  
Water Soluble Polymer ◽  
Liquid Phase Method ◽  
Transmission Electron ◽  
Zno Nanopowder

ZnO nanopowder have been prepared by chemistry liquid-phase method with the water soluble polymer and the surfactant as additive in [Zn (OH)4]2- precursor solution. The Character of spectroscopy and microstructure and phase composition was studied by X-ray diffraction, transmission electron microscopy and UV–Vis absorption spectroscopy. The possible influence like reaction time, reaction temperature, reactant ratios and so on was investigated. At the same time, the inorganic granule coring and the crystal growth affected by the water-soluble polymer and the surfactant were discussed. Studies have shown the ZnO nanopowder with the diameter of 50nm has the structure such as the good crystal state and well-defined crystallographic surfaces. The ZnO nanopowder have strong absorption in the UV region with the wavelength of 200 ~ 300 nm.

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