Lin Jia, Liu Xiaolin, Zhu Shu, Liu Yongsheng, Chen Xianfeng
Department of Physics, Shanghai University of Electric Power, 2103 Pingliang Road, Shanghai, 200090 China.
Department of Physics and Astronomy, Shanghai Jiao Tong University, 800 Dongchuan Road, Shanghai, 200240 China.
Nanoscale Res Lett. 2015 Mar 4;10:110. doi: 10.1186/s11671-015-0814-6. eCollection 2015.
We report on the synthesis of TiO2 nanotube (NT) powders using anodic oxidation and ultrasonication. Compared to free-standing NT array films, the powder-type NTs can be easily fabricated in a cost-effective way. Particularly, without the substrate effect arising from underlying Ti metals, highly crystallized NT powders with intact tube structures and pure anatase phase can be obtained using high-temperature heat treatment. The application of NTs with different crystallinity for the photocatalytic decomposition of methylene blue (MB) was then demonstrated. The results showed that with increasing annealing temperature, the photocatalytic decomposition rate was gradually enhanced, and the NT powder electrode annealed at 650°C showed the highest photoactivity. Compared to typical NTs annealed at 450°C, the rate constant increased by 2.7-fold, although the surface area was 21% lower. These findings indicate that the better photocatalytic activity was due to the significantly improved crystallinity of anatase anodic NTs in powder form, resulting in a low density of crystalline defects. This simple and efficient approach is applicable for scaled-up water purification and other light utilization applications.
我们报道了使用阳极氧化和超声处理合成二氧化钛纳米管（NT）粉末的方法。与独立的NT阵列薄膜相比，粉末型NT可以以具有成本效益的方式轻松制备。特别是，由于不存在底层钛金属产生的基底效应，通过高温热处理可以获得具有完整管结构和纯锐钛矿相的高度结晶的NT粉末。然后展示了不同结晶度的NT对亚甲基蓝（MB）光催化分解的应用。结果表明，随着退火温度的升高，光催化分解速率逐渐提高，在650°C退火的NT粉末电极表现出最高的光活性。与在450°C退火的典型NT相比，尽管表面积低21%，但速率常数增加了2.7倍。这些发现表明，更好的光催化活性归因于粉末形式的锐钛矿阳极NT的结晶度显著提高，导致晶体缺陷密度较低。这种简单有效的方法适用于扩大规模的水净化和其他光利用应用。
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