scholarly journals Engineered iron/iron oxide functionalized membranes for selenium and other toxic metal removal from power plant scrubber water

2015 ◽  
Vol 488 ◽  
pp. 79-91 ◽  
Author(s):  
Minghui Gui ◽  
Joseph K. Papp ◽  
Andrew S. Colburn ◽  
Noah D. Meeks ◽  
Benjamin Weaver ◽  
...  
Keyword(s):  
Iron Oxide ◽  
Power Plant ◽  
Metal Removal ◽  
Toxic Metal ◽  
Functionalized Membranes ◽  
Iron Iron

scholarly journals Direct Production of a Novel Iron-Based Nanocomposite from the Laser Pyrolysis ofFe(CO)5/MMAMixtures: Structural and Sensing Properties

2010 ◽  
Vol 2010 ◽  
pp. 1-12 ◽  
Author(s):  
R. Alexandrescu ◽  
I. Morjan ◽  
A. Tomescu ◽  
C. E. Simion ◽  
M. Scarisoreanu ◽  
...  
Keyword(s):  
Iron Oxide ◽  
Gas Sensors ◽  
High Sensitivity ◽  
X Ray Diffraction ◽  
Direct Production ◽  
X Ray ◽  
Metallic Particles ◽  
Ir Laser ◽  
Iron Iron ◽  
Optimum Working

Iron/iron oxide-based nanocomposites were prepared by IR laser sensitized pyrolysis ofFe(CO)5and methyl methacrylate (MMA) mixtures. The morphology of nanopowder analyzed by TEM indicated that mainly core-shell structures were obtained. X-ray diffraction techniques evidence the cores as formed mainly by iron/iron oxide crystalline phases. A partially degraded (carbonized) polymeric matrix is suggested for the coverage of the metallic particles. The nanocomposite structure at the variation of the laser density and of the MMA flow was studied. The new materials prepared as thick films were tested for their potential for acting as gas sensors. The temporal variation of the electrical resistance in presence ofNO2, CO, andCO2, in dry and humid air was recorded. Preliminary results show that the samples obtained at higher laser power density exhibit rather high sensitivity towardsNO2detection andNO2selectivity relatively to CO andCO2. An optimum working temperature of200°Cwas found.

Reuse of waste silica as adsorbent for metal removal by iron oxide modification

2007 ◽  
Vol 142 (1-2) ◽  
pp. 455-462 ◽  
Author(s):  
Fuangfa Unob ◽  
Benjawan Wongsiri ◽  
Nuchnicha Phaeon ◽  
Mahitti Puanngam ◽  
Juwadee Shiowatana
Keyword(s):  
Iron Oxide ◽  
Metal Removal

Application of Immobilized Fungi Phanerochaete chrysosporium in Removal of Heavy-Metals from Wastewater

2013 ◽  
Vol 779-780 ◽  
pp. 1674-1677 ◽  
Author(s):  
Dan Lian Huang ◽  
Guang Ming Zeng ◽  
Piao Xu ◽  
Cui Lai ◽  
Mei Hua Zhao ◽  
...  
Keyword(s):  
Heavy Metals ◽  
Iron Oxide ◽  
Magnetic Nanoparticles ◽  
Phanerochaete Chrysosporium ◽  
High Efficiency ◽  
Metal Removal ◽  
Heavy Metal Removal ◽  
Removal Of Heavy Metals ◽  
Iron Oxide Magnetic Nanoparticles ◽  
Ca Alginate

Immobilized microbe technologies are expected to be effectively used in wastewater treatment. Removal of heavy-metals from wastewater by immobilized Phanerochaete chrysosporium (Pc) with Ca-alginate and iron oxide magnetic nanoparticles (MNPs) was studied. The results showed that a biosorbent as Pc immobilized by Ca-alginate and iron oxide magnetic nanoparticles was successfully developed. And the iron oxide magnetic nanoparticles played an important role in the increase of biosorption capacity of Pc. Energy dispersive spectrometer (EDS) analysis confirmed that metal ions adsorbed to the surface of the biosorbents were partly transmitted to the interior of biosorbents, mainly embedded with iron oxide nanoparticles and Ca-alginate. Moreover, it was found that MNPs-Ca-alginate immobilized Pc showed a good affinity to various heavy metals, such as Pb(II), Zn(II), Cd(II) or Mg(II) and so on. The results proved the high efficiency of the biosorbents for heavy-metal removal and its potential application in the treatment of metal-containing wastewater.

Local fruit wastes driven benthic microbial fuel cell: a sustainable approach to toxic metal removal and bioelectricity generation

2022 ◽  
Author(s):  
Asim Ali Yaqoob ◽  
Claudia Guerrero–Barajas ◽  
Mohamad Nasir Mohamad Ibrahim ◽  
Khalid Umar ◽  
Amira Suriaty Yaakop
Keyword(s):  
Fuel Cell ◽  
Microbial Fuel Cell ◽  
Metal Removal ◽  
Toxic Metal ◽  
Bioelectricity Generation ◽  
Fruit Wastes

Hydrogen Production via the Iron/Iron Oxide Looping Cycle

2011 ◽  
Author(s):  
A. Singh ◽  
F. Al-Raqom ◽  
J. Klausner ◽  
J. Petrasch
Keyword(s):  
Iron Oxide ◽  
Hydrogen Production ◽  
Gas Phase ◽  
Energy Content ◽  
Operation Conditions ◽  
Iron Oxide Reduction ◽  
Temperature Ranges ◽  
Iron Iron ◽  
Gas Phase Separation ◽  
Distinct Temperature

The iron/iron-oxide looping cycle has the potential to produce high purity hydrogen from coal or natural gas without the need for gas phase separation: Hydrogen is produced from steam oxidation of iron or Wustite yielding primarily Magnetite; Magnetite is then reduced back to iron/Wustite using syngas (CO+H2). A system model has been developed to identify favorable operation conditions and process configurations. Process configurations for three distinct temperature ranges, (i) 500–950 K, (ii) 950–1100 K, and (iii) 1100–1200 K have been developed. The energy content of high temperature syngas from conventional coal gasifiers is sufficient to drive the looping process throughout the temperature range considered. Temperatures around 1000 K are advantageous for both the hydrogen production step and the iron oxide reduction step. Simulations of a large number of subsequent cycles indicate that quasi-steady operation is reached after approximately 5 cycles. Comparison of simulations and experiments indicate that the process is currently limited by chemical kinetics at lower temperatures. Therefore, product recirculation should be used for a scaled-up process to increase reactant residence times while maintaining sufficient fluidization velocity.

Nanoporous and nanostructured materials made out of clusters for environmental applications

2005 ◽  
Vol 876 ◽  
Author(s):  
Jiji Antony ◽  
Joseph Nutting ◽  
Donald R. Baer ◽  
You Qiang
Keyword(s):  
Iron Oxide ◽  
Chemical Reactivity ◽  
Building Blocks ◽  
High Rate ◽  
Core Shell ◽  
Shell Nanoparticles ◽  
Nanoporous Films ◽  
Iron Iron ◽  
Iron Oxide Core ◽  
Core Shell Nanoparticles

AbstractThe nanoporous materials prepared from iron-iron oxide core-shell nanoparticles are of great interest due to their enhanced possibilities for distribution in the environment, a high rate of chemical reactivity and also the possibility to enhance environmentally friendly reaction paths. However, production of these nanoparticle porous materials by conventional methods is difficult. Therefore, we use a cluster deposition system, which prepares the iron nanoclusters and iron-iron oxide core shell nanoclusters at room temperature. The nanoporous films are synthesized by using the nanoclusters as building blocks. These films are characterized using Transmission Electron Microscopy (TEM), Atomic Force Microscopy (AFM), and the Brunauer-Emmett-Teller (BET) method for surface area determination.

Microstructure, Stiffness and Corrosion of Bare and Phosphated Specimens Made by Sintering of Structured Iron-Iron Oxide Spheres

2020 ◽  
Vol 405 ◽  
pp. 411-416
Author(s):  
Miriam Kupková ◽  
Martin Kupka ◽  
Renáta Oriňáková ◽  
Radka Gorejová
Keyword(s):  
Iron Oxide ◽  
Iron Oxides ◽  
Metallic Iron ◽  
Galvanic Corrosion ◽  
Iron Phosphate ◽  
Reduction Reaction ◽  
Diffusion Control ◽  
Iron Oxide Particles ◽  
Flow Through ◽  
Iron Iron

Granulated iron oxide particles were incompletely reduced to structured particles comprised metallic iron and residual iron oxides. Structured particles were pressed into prismatic compacts and sintered. Some of sintered specimens were subsequently phosphatized and calcined. Specimens with an iron phosphate coating were found stiffer than specimens without coating. In Hanks' solution, a galvanic corrosion was induced by more noble iron oxides coupled to a less noble metallic iron. This could explain higher corrosion potentials and higher rates of iron dissolution in comparison with a pure iron. The coating of specimens with iron phosphates shifted corrosion potentials towards more negative values and slowed down the dissolution of iron. This was most likely caused by a reduction in oxygen flow through the coating to iron-oxide cathodes, which has enhanced the influence of diffusion control on the kinetics of reduction reaction.

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