Magnetic nanoparticles/graphitic carbon nanostructures composites: Excellent magnetic separable adsorbents for precious metals from aqueous solutions

作者：Wang Lei; Tian Chungui; Mu Guang; Sun Li; Zhang Hongxing^*; Fu Honggang

来源：Materials Research Bulletin, 2012, 47(3): 646-654.

DOI：10.1016/j.materresbull.2011.12.030

• Composites
• Nanostructures
• Chemical synthesis
• Magnetic structure
• Surface properties

A facile, low-cost and high-yield route was used for synthesis of magnetic nanoparticles/graphitic carbon nanostructures (MNPs/GCNs) adsorbents with adjustable GCNs structues, in which the cheap ion-exchanged resins and iron salts were adopted as the precursors. The synthesized MNPs/GCNs composites could be used as effective mobile adsorbents for removal of precious metal ions (Ag+ and Au3+). The adsorption quantity of the adsorbents for Ag+ and Au3+ ions is up to 7.88 mg/g and 7.92 mg/g, respectively, which is much higher than that of activated carbon. Notably, the adsorbents could be easily separated from solution with a commercial magnet due to the magnetic property, which is very beneficial to their practical application. The kinetics for Ag+ and Au3+ ions adsorption on MNPs/GCNs composites followed the pseudo-second-order kinetics. The XPS analyses demonstrated that the adsorbed Ag+ and Au3+ ions exsited in the form of the zero valence state silver and gold, respectively.

• 出版日期2012-3
• 单位黑龙江大学; 吉林大学