XANES−EXAFS Analysis of Se Solid-Phase Reaction Products Formed upon Contacting Se(IV) with FeS2and FeS

2008 ◽  
Vol 42 (10) ◽  
pp. 3595-3601 ◽  
Author(s):  
E. Breynaert ◽  
C. Bruggeman ◽  
A. Maes
Keyword(s):  
Solid Phase ◽  
Solid Phase Reaction ◽  
Phase Reaction ◽  
Reaction Products ◽  
Exafs Analysis

Influence of ultrasonic vibrations on the combustion of condensed systems with solid-phase reaction products

1984 ◽  
Vol 20 (6) ◽  
pp. 669-672 ◽  
Author(s):  
Yu. M. Maksimov ◽  
A. I. Kirdyashkin ◽  
A. G. Merzhanov ◽  
L. G. Raskolenko
Keyword(s):  
Solid Phase ◽  
Solid Phase Reaction ◽  
Phase Reaction ◽  
Ultrasonic Vibrations ◽  
Reaction Products ◽  
Condensed Systems

Fabrication, characterization and chemical modification of anthracene based nanostructures

2007 ◽  
Vol 22 (10) ◽  
pp. 2719-2726 ◽  
Author(s):  
Alka Gupta ◽  
Shubhra Goel ◽  
Ranjana Mehrotra ◽  
H.C. Kandpal
Keyword(s):  
Electron Microscopy ◽  
Solid Phase ◽  
Chemical Vapor ◽  
Reaction Chamber ◽  
Covalent Modification ◽  
Solid Phase Reaction ◽  
Phase Reaction ◽  
Ammonia Vapor ◽  
Reaction Products ◽  
Vapor Deposition Technique

Anthracene based nano/microstructures of different sizes and shapes like tubes/fibers are synthesized using a simple open air chemical vapor deposition technique. Thermal solid phase reaction between anthracene 9-carboxylic acid and calcium oxide reported recently [H. Liu et al., J. Am. Chem. Soc.125, 10794 (2003)] is used to obtain organic molecular nanostructures. The products of temperature (320 °C) induced reaction get deposited on the substrates placed inside the reaction chamber as well as on the inner walls in different nano/micrometer forms, tubes/rods/fibers and having different sizes. Structural characterization of the reaction products is performed using optical microscopy, field emission electron microscopy (FE-SEM) and transmission electron microscopy (TEM). Chemical composition studies are conducted using infrared (IR), nuclear magnetic resonance (NMR), and gas chromatography (GC)-Mass spectroscopy, as well as elemental analysis. IR studies of the nanostructures obtained on the substrate using IR spectroscopy reveal the presence of C=O groups, the confirmatory evidence of which is obtained using energy dispersive x-ray spectroscopic (EDS) analysis. Interaction study of the C=O groups with ammonia vapor is conducted and resulting changes are monitored using Fourier transform infrared (FTIR). A strong covalent modification of anthracene based structures by exposure to ammonia molecules is indicated.

X-ray emission during the combustion of condensed systems with solid-phase reaction products

2014 ◽  
Vol 454 (1) ◽  
pp. 5-7
Author(s):  
A. I. Kirdyashkin ◽  
V. G. Salamatov ◽  
Yu. M. Maksimov ◽  
V. F. Tarasenko ◽  
E. A. Sosnin ◽  
...  
Keyword(s):  
Solid Phase ◽  
Solid Phase Reaction ◽  
Phase Reaction ◽  
Reaction Products ◽  
X Ray ◽  
Condensed Systems

Sphalerite oxidation by Thiobacillus fertooxidans and Thiobacillus thiooxidans

1995 ◽  
Vol 41 (7) ◽  
pp. 578-584 ◽  
Author(s):  
Oswaldo Garcia Jr. ◽  
Jerry M. Bigham ◽  
Olii H. Tuovinen
Keyword(s):  
Thiobacillus Ferrooxidans ◽  
Solid Phase ◽  
Sulfide Oxidation ◽  
Xrd Analysis ◽  
Solid Phase Reaction ◽  
Phase Reaction ◽  
Reaction Products ◽  
X Ray Diffraction ◽  
Thiobacillus Thiooxidans ◽  
X Ray

Sphalerite (ZnS) oxidation was monitored in Thiobacillus ferrooxidans and Thiobacillus thiooxidans cultures and in abiotic controls by X-ray diffraction (XRD) analysis of solid phases and by chemical analysis of solution composition. X-ray diffraction data revealed no solid-phase reaction products in unsupplemented sphalerite media, whereas minor amounts of S0 accumulated in FeSC4-amended sphalerite media with or without T. ferrooxidans inoculum. Jarosite ((K,Na,H3O,NH4)Fe3(SO4)2(OH)6) also precipitated in the amended T. ferrooxidans cultures. When sphalerite media inoculated with T. thiooxidans were amended with S0, acid production was enhanced, decreasing the pH to 1.1, but Zn dissolution was not accelerated. By comparison with T. thiooxidans, T. ferrooxidans was more efficient in the oxidation of sphalerite.Key words: bioleaching of sphalerite, sphalerite oxidation, Thiobacillus ferrooxidans, Thiobacillus thiooxidans, zinc sulfide oxidation.

scholarly journals Fe3O4@C Nanoparticles Synthesized by In Situ Solid-Phase Method for Removal of Methylene Blue

Nanomaterials ◽  
2021 ◽  
Vol 11 (2) ◽  
pp. 330
Author(s):  
Hengli Xiang ◽  
Genkuan Ren ◽  
Yanjun Zhong ◽  
Dehua Xu ◽  
Zhiye Zhang ◽  
...  
Keyword(s):  
Methylene Blue ◽  
Solid Phase ◽  
Raw Materials ◽  
Phase Method ◽  
Maximum Adsorption Capacity ◽  
High Catalytic Activity ◽  
Solid Phase Reaction ◽  
Phase Reaction ◽  
High Concentrations

Fe3O4@C nanoparticles were prepared by an in situ, solid-phase reaction, without any precursor, using FeSO4, FeS2, and PVP K30 as raw materials. The nanoparticles were utilized to decolorize high concentrations methylene blue (MB). The results indicated that the maximum adsorption capacity of the Fe3O4@C nanoparticles was 18.52 mg/g, and that the adsorption process was exothermic. Additionally, by employing H2O2 as the initiator of a Fenton-like reaction, the removal efficiency of 100 mg/L MB reached ~99% with Fe3O4@C nanoparticles, while that of MB was only ~34% using pure Fe3O4 nanoparticles. The mechanism of H2O2 activated on the Fe3O4@C nanoparticles and the possible degradation pathways of MB are discussed. The Fe3O4@C nanoparticles retained high catalytic activity after five usage cycles. This work describes a facile method for producing Fe3O4@C nanoparticles with excellent catalytic reactivity, and therefore, represents a promising approach for the industrial production of Fe3O4@C nanoparticles for the treatment of high concentrations of dyes in wastewater.

Microstructure and Mechanical Properties of ZrB2/h-BN Multiphase Ceramics by Low-Temperature Reactive Sintering

2016 ◽  
Vol 697 ◽  
pp. 510-514 ◽  
Author(s):  
Feng Rui Zhai ◽  
Ke Shan ◽  
Ruo Meng Xu ◽  
Min Lu ◽  
Zhong Zhou Yi ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Relative Density ◽  
Fracture Strength ◽  
Solid Phase ◽  
Raw Materials ◽  
Solid Phase Reaction ◽  
Phase Reaction ◽  
Microstructure And Mechanical Properties ◽  
Multiphase Ceramics ◽  
Strength And Toughness

In the present paper, the ZrB2/h-BN multiphase ceramics were fabricated by SPS (spark plasma sintering) technology at lower sintering temperature using h-BN, ZrO2, AlN and Si as raw materials and B2O3 as a sintering aid. The phase constitution and microstructure of specimens were analyzed by XRD and SEM. Moreover, the effects of different sintering pressures on the densification, microstructure and mechanical properties of ZrB2/h-BN multiphase ceramics were also systematically investigated. The results show that the ZrB2 was obtained through solid phase reaction at different sintering pressures, and increasing sintering pressure could accelerate the formation of ZrB2 phase. As the sintering pressure increasing, the fracture strength and toughness of the sintered samples had a similar increasing tendency as the relative density. The better comprehensive properties were obtained at given sintering pressure of 50MPa, and the relative density, fracture strength and toughness reached about 93.4%, 321MPa and 3.3MPa·m1/2, respectively. The SEM analysis shows that the h-BN grains were fine and uniform, and the effect of sintering pressure on grain size was inconspicuous. The distribution of grain is random cross array, and the fracture texture was more obvious with the increase of sintering pressure. The fracture mode of sintered samples remained intergranular fracture mechanism as sintering pressure changed, and the grain refinement, grain pullout and crack deflection helped to increase the mechanical properties.

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