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
β-环糊精调控水溶液中Cu2+的辐射还原
在β-环糊精(β-CD)水溶液的安全吸收剂量范围内, 利用β-CD来调控Cu2+的辐射还原. 随着β-CD的加入, 硝酸铜的辐射还原产物从Cu2O 逐渐转变为Cu. 当β-CD浓度增大至8.0 mmol·L-1时, 辐射还原产物主要为Cu纳米粒子. 在辐照过程中, Cu2+的还原没有经历Cu2O的中间过程. 这是由于β-CD对·OH的清除减少了·OH与水化电子(e-aq)的反应, 增大了e-aq的产额, 从而有利于Cu的生成. 另外, β-CD通过羟基在Cu纳米粒子表面的吸附可增强Cu纳米粒子在水溶液中的稳定性. 用紫外-可见(UV-Vis)吸收光谱、粉末X射线衍射(XRD)和选区电子衍射(SAED)对Cu2+辐射还原产物进行了表征.
English
Controllable Radiolytic Reduction of Cu2+ in Aqueous Solution by β-Cyclodextrin
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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Key words:
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Radiolytic reduction
- / Nanoparticle
- / Cyclodextrin
- / Copper
- / Cuprous oxide
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