nanoscale iron particles
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scholarly journals Characterization of Multiphase Oxide Layer Formation on Micro and Nanoscale Iron Particles

Metals ◽  
2020 ◽  
Vol 11 (1) ◽  
pp. 12
Author(s):  
Elena V. Zakharova ◽  
Ella L. Dzidziguri ◽  
Elena N. Sidorova ◽  
Andrey A. Vasiliev ◽  
Ivan A. Pelevin ◽  
...  
Keyword(s):  
Oxide Layer ◽  
Size Range ◽  
Layer Formation ◽  
Iron Particles ◽  
Oxide Layers ◽  
Proposed Model ◽  
Nanoscale Iron Particles ◽  
Main Components ◽  
Tga Analysis

The article presents a detailed study and characterization of the oxide layers on the surface of iron particles of various sizes. Ten iron samples with a size range from a few nm to 50 µm were studied in detail using SEM, TEM, XRD, and TGA analysis. The composition of the multiphase oxide layers on the powder surface was investigated. The main components of the oxide layer were FeO, Fe3O4, and Fe2O3. By the obtained data, a model for the calculation of a multiphase oxide layer thickness on the surface of iron particles was proposed. The proposed model was validated and can be used for the characterization and certification of micro– and nanoscale iron particles.

scholarly journals NANOSCALE IRON PARTICLES FOR WASTEWATER DECONTAMINATION

2018 ◽  
Author(s):  
Eugenia Panturu ◽  
◽  
Razvan Ioan Panturu ◽  
Gheorghita Jinescu ◽  
Antoneta Filcenco – Olteanu ◽  
...  
Keyword(s):  
Iron Particles ◽  
Nanoscale Iron Particles

scholarly journals Green Synthesis of Iron Nanoparticles: Application on the Removal of Petroleum Oil from Contaminated Water and Soils

2018 ◽  
Vol 2018 ◽  
pp. 1-8 ◽  
Author(s):  
Erika Murgueitio ◽  
Luis Cumbal ◽  
Mayra Abril ◽  
Andrés Izquierdo ◽  
Alexis Debut ◽  
...  
Keyword(s):  
Contaminated Soil ◽  
Petroleum Hydrocarbons ◽  
Laboratory Experiments ◽  
Iron Nanoparticles ◽  
Total Petroleum Hydrocarbons ◽  
Contaminated Water ◽  
Iron Particles ◽  
Reducing Conditions ◽  
Nanoscale Iron Particles ◽  
Petroleum Oil

Iron nanoparticles were produced using the extract of mortiño berry (Vaccinium floribundum) (vZVI) as reducing and stabilizer agent. Fresh nanoparticles were characterized using TEM, XRD, and FTIR techniques, while laboratory experiments were conducted to assess the removal of total petroleum hydrocarbons (TPHs) from water and soil after treatment with synthesized nanoscale iron particles. Nanoparticles as produced were spherical in the range of 5–10 nm. After treatment with vZVI nanoparticles, water contaminated with two concentrations of TPHs (9.32 mg/L and 94.20 mg/L) showed removals of 85.94% and 88.34%, respectively, whereas a contaminated soil with a TPHs concentration of 5000 mg/kg treated during 32 h with nanoparticles reached a removal of 81.90%. Results indicate that the addition of vZVI nanoparticles produced strong reducing conditions, which accelerate removal of TPHs and suggest that these nanoparticles might be a promising technology to clean up TPHs contaminated water and soils.

scholarly journals Biochar Supported Nanoscale Iron Particles for the Efficient Removal of Methyl Orange Dye in Aqueous Solutions

PLoS ONE ◽  
2015 ◽  
Vol 10 (7) ◽  
pp. e0132067 ◽  
Author(s):  
Lu Han ◽  
Song Xue ◽  
Shichen Zhao ◽  
Jingchun Yan ◽  
Linbo Qian ◽  
...  
Keyword(s):  
Methyl Orange ◽  
Aqueous Solutions ◽  
Iron Particles ◽  
Efficient Removal ◽  
Nanoscale Iron Particles ◽  
Methyl Orange Dye

RE SULTS AND DISCUSSION Reactions with nanoscale Fe particles. Reactions of CT and CF (chloroform) with nanoscale Fe particles are shown in Figure 1. 0.103 mM (15.86 mg/L) of CT was completely reduced within 20 hours. Several intermediates and final products were observed. CF emerged very quickly and peaked (61%) around 20 hours corresponding to the disappearance of CT. Complete reduction of CF was observed around 100 hours. Both dichloromethane (DCM) (51%) and methane (41%) accumulated steadily and constituted the two major final products. Reactions with commercial grade Fe particles. Reactions of CT with the Aldrich Fe particles (98%). Three major products were identified. CF peaked (53%) around 48 hours. Complete reduction of CF was observed around 100 hours. Concentration of DCM increased rapidly corresponding to the CT reduction and leveled off around 70 hours at a yield of 71%. Methane accumulated with a final yield around 25%. Small amounts of chloromethane also observed after 72 hours and gradually accumulated to about 5% of the total carbon Figure 1. Reactions of nanoscale iron particles with CT. Initial CT concentration was 0.103 mM. Metal to solution ratio was 0.25 g/20 mL

2014 ◽  
pp. 71-71
Keyword(s):  
Total Carbon ◽  
Iron Particles ◽  
Preliminary Testing ◽  
Complete Reduction ◽  
Commercial Grade ◽  
Lower Reactivity ◽  
Nanoscale Iron Particles ◽  
Final Yield

We present here applications of the nanoscale metal particles for transformation of carbon tetrachloride (CT). CT is one of the most prevalent contaminants in soils and aquifers. It has been listed as priority pollutants by the U.S. Environmental Protection Agency, and also appeared on the Superfund National Priority List. There is an urgent need to develop effective control and treatment methods. The purpose of this study was aimed to measure the rate and extent of dechlorination, characterize and quantify reaction intermediates and final products. EXPERIMENTAL METHODS Synthesis of nanoscale iron particles. Nanoscale iron particles were synthesized by adding 1:1 volume ratio of FeCI3*6H20 (0.045M) into NaBH4 (0.25M) solution and mixed vigorously under room temperature (22±1 °С) for a few minutes. Ferric iron (Fe3+) was reduced to zero-valent iron (Fe°) by borohydride, a strong reductant. Metal particles from this reaction have sized mostly in the range between 1 to 100 nanometers [1,2]. BET analysis gave a specific surface area of 35 m2/g. Batch experiments. Batch experiments were conducted with 50 mL serum bottles. In each batch bottle, 20 mL deionized water was mixed with 0.25 g of the nanoscale metal particles. Then, 10 pL stock solution of CT dissolved in methanol was spiked into the solution. Initial organic concentration was about 0.1 mM. The serum bottles were capped with Teflon Mininert valves and mixed on a rotary shaker (30 rpm) at room temperature (22±1°C). Parallel experiments were also performed without the metal particles (control) and with a commercial grade iron (Aldrich, 99%, <10 pm, BET surface area 0.9m2/g ). Methods of Analyses. Organic concentrations were measured by the static headspace gas chromatograph (GC) method. At selected time intervals, 20 pL headspace aliquot was withdrawn from the batch bottle for GC analyses. Concentrations of chlorinated methanes were measured using a HP5890 GC equipped with a DB-624 capillary column (30mx0.32mm) and an electron capture detector (ECD). The detection limit of this method was less than 5 pg/L. Hydrocarbon products in the headspace were qualitatively identified with a Shimadzu QP5000 GC-MS and further quantified with GC analysis by comparing retention times and peak areas with standard gas samples (ethane, ethylene, acetylene, methane and carbon dioxide).

2014 ◽  
pp. 70-70
Keyword(s):  
Surface Area ◽  
Environmental Protection Agency ◽  
Room Temperature ◽  
Volume Ratio ◽  
Metal Particles ◽  
Bet Surface Area ◽  
Batch Experiments ◽  
Iron Particles ◽  
National Priority ◽  
Nanoscale Iron Particles
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