A simple one-step NaCl-assisted microwave-solvothermal method has been developed for the preparation of monodisperse α-Fe2O3 mesoporous microspheres. In this approach, Fe(NO3)3 · 9H2O is used as the iron source, and polyvinylpyrrolidone (PVP) acts as a surfactant in the presence of NaCl in mixed solvents of H2O and ethanol. Under the present experimental conditions, monodisperse α-Fe2O3 mesoporous microspheres can form via oriented attachment of α-Fe2O3 nanocrystals. One of the advantages of this method is that the size of α-Fe2O3 mesoporous microspheres can be adjusted in the range from ca. 170 to ca. 260 nm by changing the experimental parameters. High photocatalytic activities in the degradation of salicylic acid are observed for α-Fe2O3 mesoporous microspheres with different specific surface areas.

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Monodisperse α-Fe2O3 Mesoporous Microspheres: One-Step NaCl-Assisted Microwave-Solvothermal Preparation, Size Control and Photocatalytic Property

https://dr.ntu.edu.sg/bitstream/10356/96770/1/30.%20Application%20of%20Layered%20Double%20Hydroxides%20for%20Removal%20of%20Oxyanions.pdf

Application of layered double hydroxides for removal of oxyanions: A review

http://www.bashanfoundation.org/gmaweb/pdfs/P-removal.pdf

Recent advances in removing phosphorus from wastewater and its future use as fertilizer (1997-2003).

Future perspectives and recent advances in stimuli-responsive materials

Sonication-induced gelation of silk fibroin for cell encapsulation.

Removal of phosphate by layered double hydroxides containing iron.

Removal of humic substances by layered double hydroxide containing iron

Rapid removal of dilute lead from water by Pyroaurite-like compound

Pyroaurite-like compounds with a series of crystal quality were synthesized in a strong alkali solution with pH above 13. The characterization of the synthesized compounds was carried out in terms of the crystal quality, specific surface area and intercalated anions of the compounds. The crystal quality of the compounds decreased with increase in the aging time. The lower crystal quality compound showed larger dissolution than the higher crystal quality one in a solution depending on buffering capacity of the solution. Removal of phosphate using the dissolution followed by coagulation and/or precipitation process of the compounds was demonstrated. Phosphate removal property of the compounds was examined as a function of the crystal quality of the compounds, buffering capacity of the solution and competitive anion in the solution. The phosphate removal was increased depending on decrease of the crystal quality of the compound and increase of the buffering capacity of the solution. The significance of crystal quality of the compounds on the phosphate removal was elucidated.

Removal of Phosphate in Dissolution-Coagulation Process of Layered Double Hydroxide

The ultrasound technique was applied to the synthesis of layered double hydroxides. The use of ultrasound in the synthesis of these compounds was studied in terms of its effect on their crystal qualities and surface properties. The crystal qualities of the compounds synthesized with ultrasound were compared with those of compounds synthesized without ultrasound to elucidate the effect of the ultrasound on the synthesis. The effect of crystal quality (crystallite size) on the adsorption behavior of humic substances was examined. The compounds synthesized under ultrasonic conditions showed a larger crystallite size and a larger adsorption capacity for humic substances than those synthesized without ultrasonic treatment. The degree of adsorption correlated well with crystal quality.

Yoshimi Seida

Papers

Removal of phosphate by layered double hydroxides containing iron.

Removal of humic substances by layered double hydroxide containing iron

Rapid removal of dilute lead from water by Pyroaurite-like compound

Removal of Phosphate in Dissolution-Coagulation Process of Layered Double Hydroxide

Crystallization of layered double hydroxides by ultrasound and the effect of crystal quality on their surface properties