Monolayer H_1.4Ti_1.65O₄·H₂O nanosheet (denoted as NST) has been prepared as a photocatalyst for the oxidation of furfuryl alcohol (denoted as FA) to furaldehyde under visible light irradiation. The photocatalytic activity of NST is over 10 times higher than that of its layered counterpart. This enhanced activity may be attributed to the high percentage of exposed Lewis acid sites in NST. The in-situ FTIR result suggests that FA are efficiently chemosorbed on the exposed Lewis acid sites forming the surface coordination species via CO groups, resulting in the activation of FA. The surface coordination species would respond to visible light absorption. Furthermore, The XAFS result shows that the signals for TiO and Ti–Ti in NST are weaker dramatically and the signals positions are shifted by 0.03 Å in the higher R direction as compared with those in layered counterpart, suggesting the more exposed Ti and O defects in NST. The oxygen molecules absorbed on these surface defects are activated forming O₂⁻ by photo-electrons under visible light irradiation. Finally, a possible mechanism has been proposed at a molecular level.

制备了单层H _1.4 Ti _1.65 O ₄ ·H ₂ O纳米片（表示为NST）作为光催化剂，用于在可见光照射下将糠醇（表示为FA）氧化为糠醛。NST的光催化活性比其层状对应物高10倍以上。这种增强的活性可能归因于NST中暴露的路易斯酸位点的高百分比。原位FTIR结果表明，FA被有效地化学吸附在暴露的路易斯酸位点上，从而通过C O基团形成表面配位物种，从而导致FA活化。表面配位物质将对可见光吸收作出响应。此外，XAFS结果表明Ti的信号NST中的O和Ti-Ti明显较弱，与分层叠层相比，信号位置在较高的R方向上偏移了0.03Å，表明NST中暴露的Ti和O缺陷更多。吸收在这些表面缺陷中的氧分子被活化形成ö ₂ ^-通过可见光照射下的光电子。最后，在分子水平上提出了一种可能的机制。