By a News Reporter-Staff News Editor at Physics Week -- Current study results on Nanoparticles have been published. According to news reporting out of Hefei, People's Republic of China, by VerticalNews editors, research stated, "Magnetically separable millimeter-sized chitosan beads containing nanosized gamma-Fe2O3 were prepared for Cr(VI) removal. The magnetism of the beads arises from the gamma-Fe2O3 nanoparticles, by which the sorbent can be easily recovered by the application of an external magnetic field."
Our news journalists obtained a quote from the research from the Chinese Academy of Science, "Various factors influencing the sorption behavior such as pH, temperature, contact time, initial concentration of Cr(VI), and coexisting anions were systematically studied. The time-dependent Cr(VI) sorption data were well described by pseudo-second-order kinetic model. The best interpretation for the equilibrium data was the Freundlich isotherm, and the maximum sorption capacity achieved was 106.5 mg/g at an initial concentration of 200 ppm and pH 5. Thermodynamic parameters of the sorption process were also calculated, which revealed that the sorption of Cr(VI) onto gamma-Fe2O3 chitosan beads was spontaneous and exothermic. The sorbed Cr(VI) can be effectively removed from the sorbent with 0.1 M NaOH. The regeneration of the sorbents was affirmed in six sequential cycles of sorption-desorption experiments, without significant loss in sorption capacity. Furthermore, Cr(VI) loaded sorbent was investigated by means of FTIR and XPS analysis to discuss the uptake mechanism."
According to the news editors, the research concluded: "The uptake mechanism including electrostatic interaction, chelation, and precipitation were found to be involved in the complex sorption of Cr(VI) on the sorbent."
For more information on this research see: gamma-Fe2O3 Nanoparticles Encapsulated Millimeter-Sized Magnetic Chitosan Beads for Removal of Cr(VI) from Water: Thermodynamics, Kinetics, Regeneration, and Uptake Mechanisms. Journal of Chemical and Engineering Data, 2013;58(11):3142-3149. Journal of Chemical and Engineering Data can be contacted at: Amer Chemical Soc, 1155 16TH St, NW, Washington, DC 20036, USA. (American Chemical Society - www.acs.org; Journal of Chemical and Engineering Data - www.pubs.acs.org/journal/jceaax)
Our news journalists report that additional information may be obtained by contacting Y.J. Jiang, Chinese Academy Sci, Hefei Inst Phys Sci, Nanomat & Environm Detect Lab, Hefei 230031, People's Republic of China. Additional authors for this research include X.Y. Yu, T. Luo, Y. Jia, J.H. Liu and X.J. Huang.
Keywords for this news article include: Asia, Hefei, Physics, Nanotechnology, Thermodynamics, Emerging Technologies, People's Republic of China
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