A Highly Efficient TiO2-xCx Nano-heterojunction Photocatalyst for Visible Light Induced Antibacterial Applications
A Highly Efficient TiO2-xCx Nano-heterojunction Photocatalyst for Visible Light Induced Antibacterial Applications
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DOI：
10.1021/am302676a
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发表时间：
2013-03-13
影响因子：
9.5
通讯作者：
Pillai, Suresh C.
中科院分区：
文献类型：
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作者：
Etacheri, Vinodkumar;Michlits, Georg;Pillai, Suresh C.
首次报道了碳掺杂锐钛矿-板钛矿二氧化钛纳米异质结光催化剂的可见光诱导抗菌活性。这些异质结构是使用一种新的低温（100摄氏度）非水热低功率微波（300 W）辅助方法制备的。发现带间C2 p态的形成是导致碳掺杂异质结带隙变窄的原因。微波照射60分钟后获得的最具活性的光催化剂表现出比标准商业光催化剂Evonik-Degussa P-25高2倍的可见光诱导的光催化活性。掺碳纳米异质结和标准光催化剂的金黄色葡萄球菌灭活速率常数分别为0.0023和-0.0081 min（-1）。结果表明，光激发电子（来自C2 p能级）从板钛矿导带有效地转移到介电层，导致电子-空穴有效分离，这是碳掺杂锐钛矿-板钛矿纳米异质结具有上级的可见光诱导光催化和抗菌活性的原因.
Visible-light-induced antibacterial activity of carbon-doped anatase-brookite titania nano-heterojunction photocatalysts are reported for the first time. These heterostructures were prepared using a novel low temperature (100 degrees C) nonhydrothermal low power microwave (300 W) assisted method. Formation of interband C 2p states was found to be responsible for the band gap narrowing of the carbon doped heterojunctions. The most active photocatalyst obtained after 60 min of microwave irradiation exhibits a 2-fold higher visible-light induced photocatalytic activity in contrast to the standard commercial photocatalyst Evonik-Degussa P-25. Staphylococcus aureus inactivation rate constant for carbon-doped nano-heterojunctions and the standard photocatalyst was 0.0023 and -0.0081 min(-1), respectively. It is proposed that the photoexcited electrons (from the C 2p level) are effectively transferred from the conduction band of brookite to that of anatase causing efficient electron-hole separation, which is found to be responsible for the superior visible-light induced photocatalytic and antibacterial activities of carbon-doped anatase-brookite nano-heterojunctions.