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US 7,622,423 B1Granted
Synthesis of modified maghemite and jacobsite nanoparticles
AssigneeThe Hong Kong University of Science and Technology
InventorsJing Hu, Man Chi Lo, Guohua Chen
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Abstract
The present invention provides a method for making modified jacobsite, Al-doped maghemite or modified maghemite nanoparticles that can be used to adsorb heavy metals, such as Cr(VI), found in wastewater. The magnetic nanoparticles can be separated using a magnetic field after adsorbing heavy metals from wastewater, and processed for reused.
Claims11
A method for synthesizing undoped and metal-doped maghemite nanoparticles, comprising the steps of:
- dissolving FeCl24H2O and FeCl36H2O salts in purified deoxygenated water to obtain a solution;
- adding base to the solution to precipitate the maghemite nanoparticles;
- isolating the maghemite nanoparticles by a physical separation technique;
- and
- removing impurities from the maghemite nanoparticles.
2 more elements
Dependencies are inferred from the claim text.