scholarly journals Effect of Initial Salt Composition on Physicochemical and Structural Characteristics of Zero-Valent Iron Nanopowders Obtained by Borohydride Reduction

Processes ◽  
2019 ◽  
Vol 7 (10) ◽  
pp. 769 ◽  
Author(s):  
Denis Leybo ◽  
Marat Tagirov ◽  
Dmitry Arkhipov ◽  
Elizaveta Permyakova ◽  
Evgeny Kolesnikov ◽  
...  
Keyword(s):  
Structural Characteristics ◽  
Aqueous Media ◽  
Nitrogen Adsorption ◽  
Zero Valent Iron ◽  
Simultaneous Action ◽  
Borohydride Reduction ◽  
Iron Particles ◽  
Salt Composition ◽  
Reactive Iron ◽  
Initial Salt

The effect of initial salt composition on characteristics of zero-valent iron nanopowders produced via borohydride reduction was studied. The samples were characterized by X-ray diffraction, scanning and transmission electron microscopy, and low-temperature nitrogen adsorption. The efficiency of Pb2+ ions removal from aqueous media was evaluated. The use of ferric salts led to enhanced reduction kinetics and, consequently, to a smaller size of iron particles in comparison with ferrous salts. A decrease in the ionic strength of the synthesis solutions resulted in a decrease in iron particles. The formation of small highly-reactive iron particles during synthesis led to their oxidation during washing and drying steps with the formation of a ferrihydrite phase. The lead ions removal efficiency was improved by simultaneous action of zero-valent iron and ferrihydrite phases of the sample produced from iron sulphate.

Mechanism of Cu2+ Ions Removal from Aqueous Solution with PBTCA Modified Fe0 Nanoparticles

2014 ◽  
Vol 522-524 ◽  
pp. 454-457
Author(s):  
Jing Wei Feng ◽  
Ying Xia Xu
Keyword(s):  
Aqueous Solution ◽  
Iron Oxide ◽  
Photoelectron Spectroscopy ◽  
Aqueous Media ◽  
Zero Valent Iron ◽  
Borohydride Reduction ◽  
Experimental Conditions ◽  
Redox Mechanism ◽  
X Ray ◽  
Nanoscale Zero Valent Iron

Applications of PBTCA modified nanoscale zero valent iron (P-Fe0) prepared by borohydride reduction for removal of Cu2+ions from aqueous solution are investigated under a variety of experimental conditions. According to X-ray photoelectron spectroscopy (XPS) results, Cu2+ions were removed primarily via a redox mechanism that resulted in the formation of Cu0and Cu2O. The contact of P-Fe0with aqueous media caused extensive formation of iron oxide.

Laser-induced transformations of zero-valent iron particles

2012 ◽  
Author(s):  
M. Petr ◽  
K. Šišková ◽  
L. Machala ◽  
J. Kašlík ◽  
K. Šafářová ◽  
...  
Keyword(s):  
Zero Valent Iron ◽  
Iron Particles

The impact of nanoscale zero-valent iron particles on soil microbial communities is soil dependent

2019 ◽  
Vol 364 ◽  
pp. 591-599 ◽  
Author(s):  
María T. Gómez-Sagasti ◽  
Lur Epelde ◽  
Mikel Anza ◽  
Julen Urra ◽  
Itziar Alkorta ◽  
...  
Keyword(s):  
Microbial Communities ◽  
Soil Microbial Communities ◽  
Zero Valent Iron ◽  
Iron Particles ◽  
Soil Microbial ◽  
Nanoscale Zero Valent Iron ◽  
The Impact

A study on the kinetics and thermal properties of polystyrene/diatomite nanocomposites prepared via in situ ATRP

2018 ◽  
Vol 33 (2) ◽  
pp. 180-197 ◽  
Author(s):  
Khezrollah Khezri ◽  
Yousef Fazli
Keyword(s):  
Molecular Weight ◽  
In Situ Polymerization ◽  
Structural Characteristics ◽  
Nitrogen Adsorption ◽  
Linear Increase ◽  
Size Exclusion ◽  
Scanning Calorimetry ◽  
Morphological Studies ◽  
Exclusion Chromatography

Pristine mesoporous diatomite was employed to prepare polystyrene/diatomite composites. Diatomite platelets were used for in situ polymerization of styrene by atom transfer radical polymerization to synthesize tailor-made polystyrene nanocomposites. X-Ray fluorescence spectrometer analysis and thermogravimetric analysis (TGA) were employed for evaluating some inherent properties of pristine diatomite platelets. Nitrogen adsorption/desorption isotherm is applied to examine surface area and structural characteristics of the diatomite platelets. Evaluation of pore size distribution and morphological studies were also performed by scanning and transmission electron microscopy. Conversion and molecular weight determinations were carried out using gas and size exclusion chromatography, respectively. Linear increase of ln ( M0/M) with time for all the samples shows that polymerization proceeds in a living manner. Addition of 3 wt% pristine mesoporous diatomite leads to an increase of conversion from 72% to 89%. Molecular weight of polystyrene chains increases from 11,326 g mol−1 to 14134 g mol−1 with the addition of 3 wt% pristine mesoporous diatomite; however, polydispersity index values increases from 1.13 to 1.38. Increasing thermal stability of the nanocomposites is demonstrated by TGA. Differential scanning calorimetry shows an increase in glass transition temperature from 81.9°C to 87.1°C by adding 3 wt% of mesoporous diatomite platelets.

scholarly journals Degradation of the antibiotic ornidazole in aqueous solution by using nanoscale zero-valent iron particles: kinetics, mechanism, and degradation pathway

RSC Advances ◽  
2018 ◽  
Vol 8 (61) ◽  
pp. 35062-35072 ◽  
Author(s):  
Yanchang Zhang ◽  
Lin Zhao ◽  
Yongkui Yang ◽  
Peizhe Sun
Keyword(s):  
Aqueous Solution ◽  
Degradation Process ◽  
Degradation Pathway ◽  
Zero Valent Iron ◽  
Main Mechanism ◽  
Iron Particles ◽  
Nanoscale Zero Valent Iron ◽  
Nitro Reduction

The whole possible process of ONZ removal by nZVI. The reduction on the surface of nZVI was the main mechanism. A potential pathway including dechlorination, nitro reduction, N-denitration, and cleavage was proposed for the degradation process.

Sign in / Sign up

Export Citation Format

Share Document