Title | β-环糊精调控水溶液中Cu~(2+)的辐射还原 |
Other Titles | Controllable Radiolytic Reduction of Cu2+ in Aqueous Solution by beta-Cyclodextrin |
Authors | 杨士国 陈庆德 施建峰 沈兴海 |
Affiliation | 北京大学化学与分子工程学院 放射化学与辐射化学重点学科实验室 北京分子科学国家实验室 |
Keywords | 辐射还原 纳米粒子 环糊精 铜 氧化亚铜 Radiolytic reduction Nanoparticle Cyclodextrin Copper Cuprous oxide |
Issue Date | 2010 |
Publisher | 物理化学学报 |
Citation | 物理化学学报.2010,(04),805-810. |
Abstract | 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8.0mmol·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(ea-q)的反应,增大了ea-q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... 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) |
URI | http://hdl.handle.net/20.500.11897/80260 |
ISSN | 1000-6818 |
DOI | 10.3866/PKU.WHXB20100407 |
Indexed | SCI(E) 中文核心期刊要目总览(PKU) 中国科技核心期刊(ISTIC) 中国科学引文数据库(CSCD) |
Appears in Collections: | 化学与分子工程学院 |