scholarly journals Removal of Iron Oxide Fine Particles from Waste Water Using Microbubble Flotation

2008 ◽  
Vol 3 ◽  
pp. 43-50 ◽  
Author(s):  
Koichi TERASAKA ◽  
Shun AOKI ◽  
Daisuke KOBAYASHI
Keyword(s):  
Waste Water ◽  
Iron Oxide ◽  
Fine Particles

TEM observation of iron oxide pillars in montmorillonite

1990 ◽  
Vol 48 (4) ◽  
pp. 882-883
Author(s):  
H. Mori ◽  
Y. Murata ◽  
H. Yoneyama ◽  
H. Fujita
Keyword(s):  
Aqueous Solution ◽  
Iron Oxide ◽  
Fine Particles ◽  
Aqueous Suspension ◽  
Volume Ratio ◽  
Exchange Capacity ◽  
Nano Composites ◽  
Pillared Montmorillonite ◽  
Topographic Features ◽  
Transmission Electron

Recently, a new sort of nano-composites has been prepared by incorporating such fine particles as metal oxide microcrystallites and organic polymers into the interlayer space of montmorillonite. Owing to their extremely large specific surface area, the nano-composites are finding wide application[1∼3]. However, the topographic features of the microstructures have not been elucidated as yet In the present work, the microstructures of iron oxide-pillared montmorillonite have been investigated by high-resolution transmission electron microscopy.Iron oxide-pillared montmorillonite was prepared through the procedure essentially the same as that reported by Yamanaka et al. Firstly, 0.125 M aqueous solution of trinuclear acetato-hydroxo iron(III) nitrate, [Fe3(OCOCH3)7 OH.2H2O]NO3, was prepared and then the solution was mixed with an aqueous suspension of 1 wt% clay by continuously stirring at 308 K. The final volume ratio of the latter aqueous solution to the former was 0.4. The clay used was sodium montmorillonite (Kunimine Industrial Co.), having a cation exchange capacity of 100 mequiv/100g. The montmorillonite in the mixed suspension was then centrifuged, followed by washing with deionized water. The washed samples were spread on glass plates, air dried, and then annealed at 673 K for 72 ks in air. The resultant film products were approximately 20 μm in thickness and brown in color.

scholarly journals Adsorption of Gelatin on Magnetic Iron Oxide Fine Particles.

1997 ◽  
Vol 54 (7) ◽  
pp. 427-433
Author(s):  
Hirotoshi TAKAGI ◽  
Ken IKEGAME ◽  
Koichi TAMIYA ◽  
Hidefumi HIRAI
Keyword(s):  
Iron Oxide ◽  
Fine Particles ◽  
Magnetic Iron Oxide

Physicochemical and Sorption Properties of Steelmaking Flue Dust

2013 ◽  
Vol 699 ◽  
pp. 484-489
Author(s):  
Liu Ming Wu ◽  
Hai Ping Ren ◽  
Zhong Xi Sun
Keyword(s):  
Waste Water ◽  
Surface Area ◽  
Metal Ion ◽  
Fine Particles ◽  
Organic Dyes ◽  
Waste Water Treatment ◽  
High Capacity ◽  
Composition Analysis ◽  
Scanning Calorimetry ◽  
Flue Dust

The physicochemical and surface properties of steelmaking flue dust were characterized by transmission electron microscopy, BET specific surface area, chemical composition analysis, X-ray diffraction analysis, thermogravimetry and differential scanning calorimetry, potentiometric titration, zeta potential and metal ion adsorption. The results show that the dust consists mostly of spherical shaped iron and calcium oxides fine particles, the surface of the dust is negatively charged at pH > 3. The dissolution of iron oxides can be used as a resource of Fe(II) and Fe(III) ions, together with hydrogen peroxide through a Fenton like process to degrade organic dyes in waste water treatment; The existence of calcium oxide gives the dust a high capacity to neutralize strong acid in solution; Owing to the negatively charged surface, large surface area and high alkalinity the dust can also be used as a cheap and very efficient adsorbent for removing metal ions from waste water.

Synthesis and Characterization of Iron Oxide Nanostructured Particles in Na–Y Zeolite Matrix

2004 ◽  
Vol 19 (3) ◽  
pp. 930-936 ◽  
Author(s):  
Maxine Yee ◽  
Iskandar I. Yaacob
Keyword(s):  
Iron Oxide ◽  
Fine Particles ◽  
Gas Adsorption ◽  
Morphological Changes ◽  
X Ray Diffraction ◽  
Oxide Systems ◽  
Nanostructured Particles ◽  
Transmission Electron ◽  
Xrd Patterns ◽  
Adsorption Desorption

Formation of iron oxide nanoparticles within the internal cages of Na–Y zeolites was investigated. Sodium ions within the zeolites were replaced with iron(II) ions. Elemental composition studies showed a significant amount of iron in the exchanged sample. NaOH and dropwise additions of H2O2 at 60 °C triggered formation of zeolite–iron oxide systems. X-ray diffraction (XRD) patterns showed diminishing zeolite peaks along with evolution of peaks corresponding to γ-Fe2O3 and α-Fe2O3 with increasing NaOH concentration. Morphological changes from hexagonal-shaped zeolite to clusters of fine particles were observed under scanning electron microscope. Particles with about 15-nm diameter were detected by transmission electron microscopy. γ-Fe2O3 crystallites of 13.4 nm were determined from the broadening of XRD peaks. The magnetization curves of samples (precipitated using NaOH with concentrations of 2.0 M and above) showed absence of hysteresis and passed through the origin, indicating the particles are superparamagnetic. Gas adsorption–desorption measurement of the system precipitated with 2.0 M NaOH revealed a 26% increase in its specific surface area, indicating the presence of nanometer-sized particles within the zeolites.

Research on Producing New Ceramic Filter Media Modified at Surface and its Application in Pre-Treating Slightly-Polluted Water

2011 ◽  
Vol 105-107 ◽  
pp. 1736-1741
Author(s):  
Yan Qing Zhang ◽  
Meng Li
Keyword(s):  
Iron Oxide ◽  
Oxide Film ◽  
Fine Particles ◽  
Ph Value ◽  
Removal Rate ◽  
Ceramic Filter ◽  
Polluted Water ◽  
Organic Substances ◽  
Filter Media ◽  
Quality Of Water

Using Fe (NO3)3 as modifying agent, a new porous environmental ceramic filter is modified at surface to pre-treat slightly-polluted water. It can effectively reduce organic substances in subsequent processes, thus enhance the quality of water output. The iron oxide / modified ceramic filter media was manufactured by heating vaporization, and the optimal modification conditions were as follows: pH value is seven, Fe (NO3)3 density is 2mol/L, and roasting temperature is 550 centigrade. Compared with plain ceramic filter media, the removal rate of COD was enhanced six to eight times. The surface morphology of filter media was inspected by SEM, which showed that the iron oxide film, being fine particles, was attached to the ceramic filter. This is beneficial for enhancing adsorption capability. The matter species of iron oxide film were analyzed by XRD, result showed that it contains α-Fe2O3 and α-FeOOH, which is helpful for adsorbing and removing organic substances in water.

Magnetic and optical properties of silica-gel glass containing iron oxide fine particles

1997 ◽  
Author(s):  
Atsuo Yasumori ◽  
Hironari Matsumoto ◽  
Shigeo Hayashi ◽  
Kiyoshi Okada
Keyword(s):  
Optical Properties ◽  
Iron Oxide ◽  
Silica Gel ◽  
Fine Particles

The heavy metal partition in size-fractions of the fine particles in agricultural soils contaminated by waste water and smelter dust

2013 ◽  
Vol 248-249 ◽  
pp. 303-312 ◽  
Author(s):  
Haibo Zhang ◽  
Yongming Luo ◽  
Tomoyuki Makino ◽  
Longhua Wu ◽  
Masami Nanzyo
Keyword(s):  
Waste Water ◽  
Heavy Metal ◽  
Fine Particles ◽  
Agricultural Soils ◽  
Size Fractions ◽  
Metal Partition
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