Enhanced photocatalytic ethylene decomposition with anatase-rutile mixed nanostructures formed by He plasma treatment
Enhanced photocatalytic ethylene decomposition with anatase-rutile mixed nanostructures formed by He plasma treatment
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DOI：
10.1016/j.jphotochem.2021.113420
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发表时间：
2021-07-08
影响因子：
4.3
通讯作者：
Ohno, Noriyasu
中科院分区：
文献类型：
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作者：
Kajita, Shin;Miyaguchi, Kazuya;Ohno, Noriyasu
为了实现高性能的二氧化钛（TiO2）光催化乙烯分解，采用氦（He）等离子体处理制备了具有纤维状纳米结构的钛（Ti）薄膜样品。然后，从氧化温度和氧化时间两个方面对乙烯分解的氧化条件进行了优化。结果表明，He等离子体辐照沉积Ti后，在空气中氧化生成富锐钛矿型TiO2。He处理后样品的金红石锐钛矿转变温度提高到1000 K以上，其最佳光催化性能是磁控溅射法制备TiO2样品的2倍。氦等离子体处理诱导出空位、He团簇和He气泡，并形成纳米结构。结果表明，这些形态的变化导致了锐钛矿结构的稳定形成，这可能是光催化活性增强的关键因素。根据得到的乙烯分解速率，我们将讨论在长途运输货物中保持蔬菜新鲜所需的光源和光催化剂的用量。
In order to realize high-performance titanium dioxide (TiO2) photocatalysts for ethylene decomposition, titanium (Ti) thin film samples with fiberform nanostructures were prepared by helium (He) plasma treatment. Then, the oxidation condition for ethylene decomposition were optimized in terms of the oxidation temperature and duration. It is shown that He plasma irradiation with Ti deposition followed by oxidation in the air formed anatase-rich TiO2. The rutile anatase transition temperature increased to higher than 1000 K on the He treated samples and the best photocatalytic performance is twice higher than that on TiO2 sample formed in a magnetron sputtering device. Helium plasma treatment induces vacancies, He clusters, and He bubbles together with formation of nanostructures. The results suggested that those morphology changes lead to the formation of stable anatase structure, which is likely the key factor for the enhancement of photocatalytic activity. Based on the obtained ethylene decomposition rate, we will discuss the necessary light source and amount of photocatalysts to keep vegetables fresh in a long-distance transport cargo.