Acta Phys. -Chim. Sin. ›› 2010, Vol. 26 ›› Issue (04): 805-810.doi: 10.3866/PKU.WHXB20100407

• THERMODYNAMICS,THERMOCHEMISTRY AND SOLUTION CHEMISTRY • Previous Articles     Next Articles

Controllable Radiolytic Reduction of Cu2+ in Aqueous Solution by β-Cyclodextrin

YANG Shi-Guo, CHEN Qing-De, SHI Jian-Feng, SHEN Xing-Hai   

  1. Beijing National Laboratory for Molecular Sciences, Radiochemistry and Radiation Chemistry Key Laboratory of Fundamental Science, College of Chemistry and Molecular Engineering, Peking University, Beijing 100871, P. R. China
  • Received:2009-10-13 Revised:2009-11-25 Published:2010-04-02
  • Contact: SHEN Xing-Hai E-mail:xshen@pku.edu.cn

Abstract:

We used β-cyclodextrin (β-CD) to control the radiolytic reduction of Cu2+ in aqueous solution at a safe absorbed dose. With an increase in the concentration of β-CD, the reduction product of Cu(NO3)2 gradually changed from cuprous oxide to copper. At a β-CD concentration of 8.0 mmol·L-1, the main reduction product was composed of pure copper nanoparticles. Meanwhile, no cuprous oxide was generated during the course of irradiation. This is attributed to the regularity that β-CD is able to scavenge·OH, which suppresses the reaction between hydrated electrons (e-aq) and·OH, and increases the yield of e-aq. This favors the generation of copper. The adsorption of β-CDs on the surface of copper nanoparticles via hydroxyl groups promotes the stability of copper nanoparticles in the aqueous solution. The reduction products were characterized by UV-Vis absorption spectroscopy, powder X-ray diffraction (XRD), and selected area electron diffraction (SAED).

Key words: Radiolytic reduction, Nanoparticle, Cyclodextrin, Copper, Cuprous oxide

MSC2000: 

  • O645