547-68-2Relevant academic research and scientific papers
Non-isothermal studies for the decomposition course of CdC 2O4-ZnC2O4 mixture in air
Gabal
, p. 55 - 62 (2004)
The thermal decomposition of cadmium-zinc oxalate (1:1mol ratios) mixture in air was investigated by non-isothermal thermogravimetric analysis. Intermediates and the final products were characterized by X-ray diffraction and scanning electron microscopy techniques. TG showed that the mixture dehydrated in two steps and decomposed exothermically to CdO-ZnO mixture at 390°C in a further two steps. The observed increase in the intensity of the X-ray diffraction lines by raising the calcination temperature from 400 to 800°C is attributed to the grain growth of CdO-ZnO mixture as revealed from SEM experiments. The kinetics of the oxalate decomposition steps was performed using the various reaction interface models and differential techniques of computational analysis of non-isothermal data. The activation parameters, calculated using the integral composite method, showed that the reactions were best described by the random nucleation model characteristic of solid state nucleation growth mechanism. The results of activation parameters for the different decomposition steps are compared and discussed.
A simple and novel route for the preparation of ZnO nanorods
Xu, Congkang,Xu, Guoding,Liu, Yingkai,Wang, Guanghou
, p. 175 - 179 (2002)
Synthesis of zinc oxide (ZnO) nanorods was achieved by thermal decomposition of the precursor of ZnC2O4 obtained via chemical reaction between Zn(CH3COO)2·2H2O and H2C2O4·2H2O in the presence of surfactant nonyl phenyl ether (9)/(5) and NaCl flux. Transmission electron microscopy, X-ray diffraction, Raman spectroscopy, X-ray photoelectron spectroscopy, selected area electron diffraction, and high-resolution transmission electron microscopy were used to characterize the structure features and chemical compositions of the as-made nanorods. The results showed that the as-prepared nanorods are composed of ZnO with diameter of 10-60 nm, and lengths ranging from 1 to 3 μm. The mechanism of formation of ZnO nanorods is also discussed.
Synthesis, crystal structure, and properties of two zinc(II) complexes with 2-propyl-4,5-imidazoledicarboxylic acid
Luo, Zhirong,Zhuang, Jichang,Wu, Qiaolan,Yin, Xianhong,Zheng, Xiaoxia,Wei, Huan
, p. 455 - 462 (2012)
A tetradentate 2-propyl-4,5-imidazoledicarboxylic acid [H3pimdc] reacts with zinc sulfate in the ethanol aqueous solution and zinc acetate in the N,N-dimethylformamide (DMF) aqueous solution to give two complexes [Zn(H 2pimdc)2(H2O)2]·4H 2O and [Zn(H2pimdc)2(H2O) 2]·2DMF. The complexes were characterized by X-ray single crystal analysis, thermal analysis, and IR spectrum. Because of the different coordination of water, complex 1 forms a fishing net-like latticed topology geometry via hydrogen bonds and π-π stacking interaction, but complex 2 forms a layer-like topology geometry via hydrogen bonds and π-π stacking interaction. Copyright Taylor & Francis Group, LLC.
Synthesis and thermal decomposition of new complexes of bipyridine isomers with zinc(II) and cadmium(II) oxalates
Czakis-Sulikowska,Malinowska,Markiewicz
, p. 151 - 156 (2000)
The new mixed ligand complexes with the formulae Zn(2-bipy)(ox), Zn(4-bipy)1.5(ox)·H2O, Zn(2,4′-bipy)2(ox)·2H2O, Cd(2-bipy)(ox)·2H2O, Cd(4-bipy)2(ox) and Cd(2,4′-bipy)(ox)·2H2O (2-bipy, 4-b
Solar photocatalytic and self-cleaning performances of HoVO4 doped ZnO
Thirumalai, Kuppulingam,Shanthi, Manohar,Swaminathan, Meenakshisundaram
, p. 178 - 187 (2018)
In this article we report preparation of 5 wt% HoVO4 doped ZnO via template-free hydrothermal process and investigated its photocatalytic activity against azo dyes Rhodamine-B (Rh-B), Trypan Blue (TB) and Acid Black 1 (AB 1) in solar light irradiation. Th
Easy and Green Route towards Nanostructured ZnO as an Active Sensing Material with Unexpected H2S Dosimeter-Type Behaviour
Diodati, Stefano,Hennemann, J?rg,Fresno, Fernando,Gialanella, Stefano,Dolcet, Paolo,Lavren?i? ?tangar, Ur?ka,Smarsly, Bernd M.,Gross, Silvia
, p. 837 - 846 (2019)
Nanostructured ZnO particles were prepared through a straightforward, quick and low-temperature synthesis route involving coprecipitation of the metal precursor salts with oxalic acid, followed by hydrothermal treatment at 135 or 160 °C. The synthesised nanostructured powders were thoroughly characterised by a wide array of analytical techniques from the morphological (Scanning Electron Microscopy -SEM-, Transmission Electron Microscopy -TEM-, Energy-dispersive X-ray Spectroscopy -EDXS-), structural (Powder X-ray Diffraction -PXRD-, Selected Area Electron Diffraction -SAED-), compositional (X-ray Photoelectron Spectroscopy -XPS-) and physical (thermal stability) point of view. As far as functional applications are concerned, the powders were tested as gas sensor materials for H2S detection. Thereby these ZnO particles showed unexpected gas dosimeter behaviour at 150 °C. Based on these observations and on a comparison with literature a new model for the interaction of ZnO nanostructures with H2S is proposed.
Synthesis of ZnO nanoparticles for varistor application using Zn-substituted aerosol OT microemulsion
Singhal,Chhabra,Kang,Shah
, p. 239 - 247 (1997)
This paper describes a new method for the synthesis of zinc oxide nanoparticles using ethanol-in-oil microemulsions with Zn-DEHSS (diethylhexyl sulfosuccinate) as surfactant. The zinc oxide nanoparticles find application in varistors and other functional devices. These particles have been characterized by X-ray diffraction, TEM, and BET surface area. Microemulsion droplets were characterized by quasi elastic light scattering (QELS). Varistors formed from doped zinc oxide nanoparticles finds application as low voltage surge devices with low leakage current and high coefficient of nonlinearity (α). In this paper, we have shown that the critical voltage of the varistor is related to the grain size which is related to size of ZnO particles. The smaller ZnO particles lead to larger grain size, thereby lowering the critical voltage.
Synthesis of zinc glycerolate microstacks from a ZnO nanorod sacrificial template
Remias, Robert,Kukovecz, Akos,Daranyi, Maria,Kozma, Gabor,Varga, Szilvia,Konya, Zoltan,Kiricsi, Imre
, p. 3622 - 3627 (2009)
We synthesized zinc glycerolate (ZnGly) microstacks by treating ZnO with glycerol at 100°C under reflux. We observed that the morphology of the ZnO source has a pronounced effect on the appearance of the ZnGly product. In the absence of structure-directin
Photocatalytic degradation of methyl orange using ZnO nanopowders synthesized via thermal decomposition of oxalate precursor method
Kaur, Japinder,Bansal,Singhal, Sonal
, p. 33 - 38 (2013)
ZnO nanoparticles were synthesized by thermal decomposition of oxalate precursor method. The nanopowders were characterized using powder X-ray diffraction technique and scanning electron microscopy and sample was found to have hexagonal wurtzite structure of ZnO. Average crystallite size of ZnO was found to be ～27 nm. The photocatalytic activity of ZnO was evaluated by using methyl orange (MO) as probe molecule. It was inferred from control experiments that presence of both ZnO and UV light is necessary for photodegradation. From photocatalytic experiment it was observed that MO is completely degraded in 80 min when the amount of catalyst is 1 g/L and initial concentration of MO is 0.03 mM. The effect of dye concentration, catalyst loading and solution pH on photodegradation rate was also investigated. It was found that optimal conditions for photodegradation of MO are 1 g/L catalyst at a solution pH 9. Photodegradation of MO was found to follow pseudo-first order kinetics. Langmuir-Hinshelwood model was also used to describe the photodegradation process.
Defect-enhanced photocatalytic activity of ZnO micro/nanostructures
Wang, Yu,Yan, Mei,Chen, Qinguo,Peng, Yin
, p. 1557 - 1563 (2013)
ZnO micro/nanocrystals with controlled oxygen defects are successfully prepared through annealing precursors obtained via a simple solvothermal method. The size and surface defects of the as-synthesized ZnO micro/nanocrystals increase with the solvent volume ratio of water/ethanol increasing; the BET surface areas of the corresponding samples decrease during these processes; photoluminescence reveals that the type and concentration of surface defects (oxygen vacancy and interstitial oxygen) are quite different for the samples prepared via different solvent volume ratio of water/ethanol. In addition, it is found that the photocatalytic activity of the synthesized ZnO nanocrystals is mainly dependent on the concentration of surface defects. The sample with more surface defects exhibits higher photocatalytic activity toward the degradation of methylene blue (MB). The possible photocatalytic mechanism is discussed in detail. Copyright
