High Efficient Photocatalytic Degradation of p-Nitrophenol on a Unique Cu2O/TiO2 p-n Heterojunction Network Catalyst
High Efficient Photocatalytic Degradation of p-Nitrophenol on a Unique Cu2O/TiO2 p-n Heterojunction Network Catalyst
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独特的Cu2O/TiO2 p-n异质结网络催化剂高效光催化降解对硝基苯酚
DOI：
10.1021/es101711k
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发表时间：
2010-10-01
影响因子：
11.4
通讯作者：
Cai, Qingyun
中科院分区：
文献类型：
--
作者：
Yang, Lixia;Luo, Shenglian;Cai, Qingyun
对硝基苯酚(PNP)是一种难降解的有机污染物，在没有强氧化剂的情况下，在太阳光下很难分解。研究表明，在人造太阳光下，Cu2O/TiO2p-n结网络可以有效地降解PNP，这种网络是通过阳极氧化载铜纳米管(NTS)而形成的。该网络由n型纳米二氧化钛阵列顶面的p型Cu2O纳米线和内壁的Cu2O纳米颗粒组成。Cu2O/TiO2网络的降解速率(1.97mug/min cm(2))明显高于未改性的TiO2NTS(0.85mug/min cm(2))。光催化活性的提高可以归因于Cu2O纳米线网络对可见光吸收的扩展和Cu2O/TiO2p-n结界面光诱导电势差驱动的光生载流子的有效分离。
p-Nitrophenol (PNP) is a difficultly decomposed organic pollutant under solar light in the absence of strong oxidants. This study shows that under artificial solar light PNP can be effectively degraded by a Cu2O/TiO2 p-n junction network which is fabricated by anodizing Cu-0 particles-loaded TiO2 nanotubes (NTs). The network is composed of p-type Cu2O nanowires on the top surface and Cu2O nanoparticles on the inner walls of the n-type TiO2 NT arrays. The Cu2O/TiO2 network shows much higher degradation rate (1.97 mu g/min cm(2)) than the unmodified TiO2 NTs (0.85 mu g/min cm(2)). The enhanced photocatalytic acitivity can be attributed to the extended absorption in the visible resulting from the Cu2O nanowire networks and the effective separation of photogenerated carriers driven by the photoinduced potential difference generated at the Cu2O/TiO2 p-n junction interface.