Formation of nickel-doped magnetite hollow nanospheres with high specific surface area and superior removal capability for organic molecules. (31st October 2016)

• Record Type: Journal Article
• Authors: Li, Zhenhu; Ma, Yurong; Qi, Limin
• Is Part Of: Nanotechnology. Volume 27:Number 48(2016)
• Publication Date: 2016-10-31
• Subjects: hollow nanospheres -- NixFe3−xO4 -- adsorption capacity -- solvothermal method; Nanotechnology -- Periodicals; Nanotechnology -- Periodicals; Nanotechnology; Publications périodiques; Nanotechnologies; Periodicals; 620.5
• DOI: 10.1088/0957-4484/27/48/485601
• Languages: English
• ISSNs: 0957-4484

Abstract

Abstract: A strategy for the formation of magnetic Ni x Fe3− x O4 hollow nanospheres with very high specific surface areas was designed through a facile solvothermal method in mixed solvents of ethylene glycol and water in this work. The Ni/Fe ratios and the crystal phases of the Ni x Fe3− x O4 hollow nanocrystals can be readily tuned by changing the molar ratios of Ni to Fe in the precursors. An inside-out Ostwald ripening mechanism was proposed for the formation of uniform Ni x Fe3− x O4 hollow nanospheres. Moreover, the obtained Ni x Fe3− x O4 hollow nanospheres exhibited excellent adsorption capacity towards organic molecules such as Congo red in water. The maximum adsorption capacities of Ni x Fe3− x O4 hollow nanospheres for Congo red increase dramatically from 263 to 500 mg g −1 with the increase of the Ni contents ( x ) in Ni x Fe3− x O4 hollow nanospheres from 0.2 to 0.85. The synthesized Ni x Fe3− x O4 nanoparticles can be potentially applied for waste water treatment.