Wang Wenzhong, Wang Jun, Wang Zhizhen, Wei Xuanzhen, Liu Li, Ren Qingshan, Gao Wenliang, Liang Yujie, Shi Honglong
School of Science, Minzu University of China, Beijing 100081, China.
Dalton Trans. 2014 May 14;43(18):6735-43. doi: 10.1039/c3dt53613k.
A new strategy via coupling a polyol route with an oxidation process has been developed to successfully synthesize p-n junction CuO/BiVO4 heterogeneous nanostructures. The experimental results reveal that the as-prepared p-n junction CuO/BiVO4 heterogeneous nanostructures exhibit much higher visible-light-driven photocatalytic activity for the degradation of model dye rhodamine B (RhB) than the pure BiVO4 nanocrystals. The photocatalytic degradation rate (C/C0) of the RhB for p-n junction CuO/BiVO4 heterogeneous nanostructures is about two times higher than that of pure BiVO4 nanocrystals. The enhanced photocatalytic efficiency is attributed to a large number of p-n junctions in CuO/BiVO4 heterogeneous nanostructures, which effectively reduces the recombination of electrons and holes by charge transfer from n-type BiVO4 to the attached p-type CuO nanoparticles. This work not only provides an efficient route to enhance the visible-light-driven photocatalytic activity of BiVO4, but also offers a new strategy for fabricating p-n junction heterogeneous nanostructure photocatalysts, which are expected to show considerable potential application in solar-driven wastewater treatment and water splitting.
通过将多元醇路线与氧化过程相结合，开发了一种新策略，成功合成了p-n结CuO/BiVO4异质纳米结构。实验结果表明，所制备的p-n结CuO/BiVO4异质纳米结构对模型染料罗丹明B（RhB）的可见光驱动光催化降解活性远高于纯BiVO4纳米晶体。p-n结CuO/BiVO4异质纳米结构对RhB的光催化降解率（C/C0）比纯BiVO4纳米晶体高约两倍。光催化效率的提高归因于CuO/BiVO4异质纳米结构中的大量p-n结，通过从n型BiVO4到附着的p型CuO纳米颗粒的电荷转移，有效地减少了电子和空穴的复合。这项工作不仅提供了一种提高BiVO4可见光驱动光催化活性的有效途径，还为制备p-n结异质纳米结构光催化剂提供了一种新策略，有望在太阳能驱动的废水处理和水分解中显示出可观的潜在应用。
