Iron oxide incorporated titania nanoparticles (FIT) with various atomic ratios of Fe/Ti, i.e. 3.53% (FIT-1), 8.3% (FIT-2), and 20.79% (FIT-3), are prepared to monitor the selectivity of photo-degradation for anthranilic acid (AA) in molecular level. In the FIT-1 route, the products obtained from the photo-degradation of AA are aniline, 4-aminophenol, and benzene. Since the surface of iron oxide domain in FIT-1 is fully reduced to FeO. The FeO, by trapping the photo-generated (e⁻), acts as a Lewis base to facilitate the de-carboxylation reaction for AA to create aniline. It is noteworthy that the highly alkaline surface of FIT-1 executes the hydroxylation addition for AA to produce 4-aminophenol. In FIT-2, and FIT-3 routes, the surface of incorporated iron oxide is only partially reduced to FeO. After the photo-degradation of AA, the collected products are 2-aminobenzaldehyde, and benzene. In this route, the low spin (LS) Fe³⁺ ion in the Fe₂O₃ region adopts the photo-generated (e⁻). The LS Fe³⁺ is reduced to stable LS Fe²⁺, i.e. FeO. At this stage, the Fe₂O₃ domain acts as a Lewis acid to push forward the carbonyl reduction of AA to obtain 2-aminobenzaldehyde. In addition, the de-amination is contributed by the nucleorphilic attack of water molecule to the carbon atom of aromatic ring bonded to NH₂ group. After the de-amination reaction, the intermediate product is phenol. The following de-hydroxyl reaction by FeO domain proceeds immediately. The final product is benzene that is observed in all FIT involved catalytic routes.

中文翻译：

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邻氨基苯甲酸对掺入氧化铁的二氧化钛纳米粒子的光催化选择性：氧化铁的Fe ²⁺ / Fe ³⁺比的影响

制备了具有不同原子比的Fe / Ti（即3.53％（FIT-1），8.3％（FIT-2）和20.79％（FIT-3））的掺入氧化铁的二氧化钛纳米颗粒（FIT），以监测铁的选择性。邻氨基苯甲酸（AA）的光降解。在FIT-1路线中，由AA的光降解获得的产物是苯胺，4-氨基苯酚和苯。由于FIT-1中的氧化铁畴表面被完全还原为FeO。FeO的，通过捕获光产生的（E ^-）充当路易斯碱，以促进AA的脱羧反应生成苯胺。值得注意的是，FIT-1的高碱性表面对AA进行了羟基化反应，生成了4-氨基苯酚。在FIT-2和FIT-3路线中，掺入的氧化铁表面仅部分还原为FeO。在AA光降解之后，收集的产物是2-氨基苯甲醛和苯。在该路线中，低自旋（LS）的Fe ³⁺在铁离子₂ ö ₃区域采用光生（E ^- ）。LS Fe ³⁺被还原成稳定的LS Fe ²⁺，即FeO。在这一阶段，Fe ₂ O ₃结构域充当路易斯酸以促进AA的羰基还原以获得2-氨基苯甲醛。另外，脱氨是由于水分子对结合到NH ₂基团的芳环的碳原子的亲核攻击而引起的。脱氨基反应后，中间产物是苯酚。由FeO结构域进行的随后的脱羟基反应立即进行。最终产物是苯，在所有FIT涉及的催化途径中都可以观察到。