光催化
X射线光电子能谱
结晶度
材料科学
分解水
热重分析
氧气
漫反射红外傅里叶变换
光化学
分析化学(期刊)
化学工程
核化学
化学
复合材料
催化作用
有机化学
工程类
作者
María Cabrero-Antonino,Josep Albero,Cristina García-Vallés,Mercedes Álvaro,Sergio Navalón,Hermenegildo Garcı́a
标识
DOI:10.1002/chem.202003763
摘要
Abstract Defect engineering in metal‐organic frameworks is commonly performed by using thermal or chemical treatments. Herein we report that oxygen plasma treatment generates structural defects on MIL‐125(Ti)‐NH 2 , leading to an increase in its photocatalytic activity. Characterization data indicate that plasma‐treated materials retain most of their initial crystallinity, while exhibiting somewhat lower surface area and pore volume. XPS and FT‐IR spectroscopy reveal that oxygen plasma induces MIL‐125(Ti)‐NH 2 partial terephthalate decarboxylation and an increase in the Ti‐OH population. Thermogravimetric analyses confirm the generation of structural defects by oxygen plasma and allowed an estimation of the resulting experimental formula of the treated MIL‐125(Ti)‐NH 2 solids. SEM analyses show that oxygen plasma treatment of MIL‐125(Ti)‐NH 2 gradually decreases its particle size. Importantly, diffuse reflectance UV/Vis spectroscopy and valence band measurements demonstrate that oxygen plasma treatment alters the MIL‐125(Ti)‐NH 2 band gap and, more significantly, the alignment of highest occupied and lowest unoccupied crystal orbitals. An optimal oxygen plasma treatment to achieve the highest efficiency in water splitting with or without methanol as sacrificial electron donor under UV/Vis or simulated sunlight was determined. The optimized plasma‐treated MIL‐125(Ti)‐NH 2 photocatalyst acts as a truly heterogeneous photocatalyst and retains most of its initial photoactivity and crystallinity upon reuse.
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