Electrochemical synthesis and photocatalytic property of cuprous oxide nanoparticles
Electrochemical synthesis and photocatalytic property of cuprous oxide nanoparticles
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DOI：
10.1016/j.materresbull.2006.01.004
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发表时间：
2006-07
影响因子：
5.4
通讯作者：
Huaming Yang;Jing Ouyang;A. Tang;Yuanyuan Xiao;Xianwei Li;Xiaodan Dong;Yongmei Yu
中科院分区：
文献类型：
--
作者：
Huaming Yang;Jing Ouyang;A. Tang;Yuanyuan Xiao;Xianwei Li;Xiaodan Dong;Yongmei Yu
在碱性NaCl溶液中，以铜为电极，K2 Cr2 O 7为添加剂，采用电化学方法成功制备了粒径为35 nm的纳米氧化亚铜（Cu 2 O）。分别在紫外光和太阳光下研究了Cu 2 O水溶液中橙子（MeO）的光催化降解。采用X射线衍射（XRD）、透射电子显微镜（SEM）、傅里叶变换红外光谱（FT-IR）、紫外-可见光谱（UV-vis）和X射线光电子能谱（XPS）等手段对样品进行了表征。结果表明，电流对Cu 2 O纳米晶的生长没有明显的影响，当Cu 2 O用量为2g/L时，紫外光照射2 h或太阳光照射3 h，可使97%的甲醇脱色。催化剂的循环使用表明，Cu 2 O重复使用4次仍具有较高的光催化效率。Cu_2O纳米粒子在煅烧后仍保持立方晶相，但部分氧化为CuO。与原始Cu_2O纳米颗粒相比，经过四次煅烧后的Cu_2O粉末中Cu的2 p电子发生了1 eV的位移，Cu的俄歇信号发生了1.6eV的位移。在Cu_2O粉末中，经热处理后，在401.1，237.4和170.2eV处还观察到一些新的吸收峰。
Cuprous oxide (Cu2O) nanoparticles of 35nm in crystal size have been successfully synthesized via electrochemical method in alkali NaCl solutions with copper as electrodes and K2Cr2O7as additive. Photocatalytic degradation of methyl orange (MeO) in aqueous Cu2O solution was investigated under either ultraviolet (UV) light or sunlight. X-ray diffraction (XRD), transmission electron microscopy (SEM), Fourier transformation infrared spectroscopy (FT-IR), ultraviolet–visible spectroscopy (UV–vis) and X-ray photoelectron spectroscopy (XPS) were introduced to characterize the samples. The results indicate that electric current shows no obvious effect on the growth of Cu2O nanocrystals and that 97% of MeO can be decolorized under UV irradiation for 2h or under sunlight for 3h when amount of Cu2O is 2g/L. Recycling use of the catalyst revealed that Cu2O still has a high photocatalytic efficiency when repeatedly used for four times. Cu2O nanoparticles still kept its cubic crystal phase, but fractionally oxidized to be CuO after the photocatalysis. Compared with the original Cu2O nanoparticles, there has 1eV shift of Cu 2p electron and 1.6eV shift of Cu Auger signals for the Cu2O powders after four times photocatalysis. Some new peaks can also be observed at 401.1, 237.4 and 170.2eV in the Cu2O powders after photocatalysis.