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

We used beta-cyclodextnn (beta-CD) to control the radiolytic reduction of Cu2+ in aqueous solution at a safe absorbed dose With an increase in the concentration of beta-CD. the reduction product of Cu(NO3)(2) gradually changed from cuprous oxide to copper. At a beta-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 beta-CD is able to scavenge center dot OH, which suppresses the reaction between hydrated electrons (e(aq)(-)) and center dot OH. and increases the yield of e(aq)(-). This favors the generation of copper The adsorption of beta-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)