Citation:
YANG Shi-Guo, CHEN Qing-De, SHI Jian-Feng, SHEN Xing-Hai. Controllable Radiolytic Reduction of Cu2+ in Aqueous Solution by β-Cyclodextrin[J]. Acta Physico-Chimica Sinica,
;2010, 26(04): 805-810.
doi:
10.3866/PKU.WHXB20100407
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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).
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Keywords:
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Radiolytic reduction
, - Nanoparticle,
- Cyclodextrin,
- Copper,
- Cuprous oxide
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