Hollow CuO microspheres with open nanoholes: Fabrication and photocatalytic properties
Hollow CuO microspheres with open nanoholes: Fabrication and photocatalytic properties
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具有开放纳米孔的空心 CuO 微球：制造和光催化性能
DOI：
10.1016/j.jallcom.2016.05.257
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发表时间：
2016-11-15
影响因子：
6.2
通讯作者：
Zhang, W. B.
中科院分区：
文献类型：
--
作者：
Wang, S. B.;Wang, X. Q.;Zhang, W. B.
本工作通过 SiO2 模板辅助合成工艺在水热条件下制备了一种具有开放纳米孔的新型空心 CuO 微球。硅酸钠充当碱性介质以及SiO2前体。硫酸铜和葡萄糖分别用作铜源和还原剂。合成产物由Cu2O/SiO2混合物组成，经600℃煅烧后完全转化为CuO/SiO2，然后可以通过NaOH蚀刻去除SiO2。最终，获得了一种具有开放纳米孔的空心氧化铜微球。结果表明，这种微球由许多小的CuO晶粒组成，中空内部结构和开放的纳米孔的产生是由于SiO2纳米颗粒去除的印记。同时，研究了硅酸钠用量对反应的影响，表明只有使用足够的量才能制备这种 CuO 微球。此外，我们还提出了此类纳米结构可能的形成机制。在相同条件下，这些 CuO 微球对甲基橙 (MO) 的降解表现出比商业 CuO 粉末（类似于 200 nm）更好的光催化活性。 (C) 2016 Elsevier B.V. 保留所有权利。
A kind of novel hollow CuO microspheres with open nanoholes was fabricated via a SiO2 template-assisted synthesis process under hydrothermal conditions in the present work. Sodium silicate acted as an alkaline medium as well as SiO2 precursor. Copper sulphate and glucose were used as copper source and reducing agent, respectively. The as-synthesized products consisted of Cu2O/SiO2 mixture, which was transformed completely into CuO/SiO2 after calcinations at 600 degrees C, and then SiO2 could be removed by NaOH etching. Eventually, a kind of hollow CuO microspheres with open nanoholes was attained. Results showed such microspheres were composed of numerous small CuO crystalline grains, and the productions of hollow inner structures and open nanoholes were from the imprints of SiO2 nanoparticle removal. Meanwhile, the effect of the amount of sodium silicate in the reaction was investigated, suggesting such CuO microspheres could be fabricated only if an enough amount was used. In addition, we also propose the possible formation mechanism of such nanostructures. These CuO microspheres exhibited a better photocatalytic activity on the degradation of methyl orange (MO) than commercial CuO powders (similar to 200 nm) under the identical conditions. (C) 2016 Elsevier B.V. All rights reserved.