Journal
ACS APPLIED MATERIALS & INTERFACES
Volume 4, Issue 9, Pages 4913-4920Publisher
AMER CHEMICAL SOC
DOI: 10.1021/am301239u
Keywords
superparamagnetism; magnetite; high saturation magnetization; fast chromium removal; water treatment; adsorption
Funding
- Program for Science & Technology Innovation Talents in Universities of Henan Province [2008 HASTIT002]
- Natural Science Foundation of China [20971036, 51102077]
- Construct Program of the Key Discipline in Hunan Province [2011-76]
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High saturation magnetization monodisperse Fe3O4 hollow microspheres (109.48 emu/g) with superparamagnetic property at room temperature are promptly synthesized by a one-step solvothermal process with the presence of sodium dodecylbenzenesulfonate as an additive. The as-synthesized products possess superparamagnetism, large cavity, high water solubility, and saturation magnetization at room temperature. In particular, these hollow microspheres exhibit both of a rather short separation time from industry wastewater and a high adsorption capacity about 180 mg/g at high Cr(VI) concentrations, which is much better than those of reported magnetite solid nanoparticles. In addition, the X-ray photoelectron spectra (XPS) show that the uptake of Cr(VI) into the spheres was mainly governed by a physicochemical process. The micelle-assisted Ostwald ripening process was proposed to explain the rapid formation of hollow structures by a series of control experiments. The as-manufactured products with the two advantages mentioned above serve as ideal candidates for environmental remediation materials.
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