Synthesis of high saturation magnetization superparamagnetic Fe3O4 hollow microspheres for swift chromium removal.
High saturation magnetization monodisperse Fe(3)O(4) 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.
Key Lab for Special Functional Materials of Ministry of Education, Henan University, Kaifeng 475004, People's Republic of China.
Yubiao
Y
Liu
Yongqiang
Y
Wang
Shaomin
S
Zhou
Shiyun
S
Lou
Lin
L
Yuan
Tao
T
Gao
Xiaoping
X
Wu
Xiaojing
X
Shi
Ke
K
Wang
D000327:Adsorption; D002857:Chromium / Q000737:chemistry / Q000302:isolation & purification; D052203:Ferrosoferric Oxide / Q000737:chemistry*; D008280:Magnetics; D008823:Micelles; D008863:Microspheres; D018508:Water Purification
D008823:Micelles; D002857:Chromium; D052203:Ferrosoferric Oxide