The two-dimensional (2D) Metal Organic Framework (MOF) of NH₂-MIL-125(Ti) nanosheets with oxygen vacancies were prepared to construct a multifunctional photocatalyst via surface modification of Pd nanoparticles (Pd/MTNs). The obtained photocatalyst showed the highly efficiency for precisely transformation of benzylamine to N-benzylidene benzylamine under visible light irradiation and 1 atm air pressure at room temperature. With the assistance of theoretical mathematical model, the MTNs loaded 0.5% wt Pd completed the transformation for benzylamine (>99%) precisely to N-Benzylidenebenzylamine (99%). However, the Bulk loaded 0.5% wt Pd exhibits decreased conversion (80.5%) and selectivity (85.9%). AFM, XPS and UV–vis DRS experiments indicated that the open 2D structure of MTNs would contribute to the generation of surface oxygen vacancies (OV) sites and abundant Ti metal sites with underfilling electrons 3d orbit, enhancing the light absorption. In-situ FTIR revealed that these exposed Ti atoms would act as the discriminating sites to specifically adsorb the benzylamine molecules forming chemical coordination bonds -C-N⋯Ti- on interface, polarizing and activating -C-N-bonds in benzylamine. Additionally, series of in-situ EPR and experimental results elucidated that the surface OV sites would act as the functional sites to capture the O₂ molecules from air. Furthermore, surface Pd sites would as an active site to accelerate the photo-generated electrons transfer from inside to interface, inducing the activation of adsorbed O₂ molecules to O₂^–. Based on these cooperating function sites in MTNs, a possible catalytic mechanism was discussed in a molecular scale. This work highlights the rational construction of a multifunctional photocatalyst and the synergistic effects of the surface coordination and photocatalysis.

_{NH 2}的二维（2D）金属有机骨架（MOF）-制备具有氧空位的MIL-125(Ti)纳米片，通过Pd纳米粒子(Pd/MTNs)的表面改性构建多功能光催化剂。所获得的光催化剂在可见光照射和室温下 1 个大气压的气压下显示出将苄胺精确转化为 N-亚苄基苄胺的高效率。在理论数学模型的帮助下，负载 0.5% wt Pd 的 MTN 准确地完成了苄胺（>99%）到 N-亚苄基苄胺（99%）的转化。然而，散装负载的 0.5% wt Pd 表现出降低的转化率 (80.5%) 和选择性 (85.9%)。原子力显微镜，XPS 和 UV-vis DRS 实验表明，MTN 的开放 2D 结构将有助于产生表面氧空位 (OV) 位点和丰富的 Ti 金属位点，并具有未充分填充的电子 3d 轨道，从而增强了光吸收。原位FTIR显示，这些暴露的Ti原子将作为区分位点，特异性吸附苄胺分子，在界面上形成化学配位键-CNTi⋯，极化并激活苄胺中的-CN-键。此外，一系列原位 EPR 和实验结果表明，表面 OV 位点将作为功能位点捕获 O 原位FTIR显示，这些暴露的Ti原子将作为区分位点，特异性吸附苄胺分子，在界面上形成化学配位键-CNTi⋯，极化并激活苄胺中的-CN-键。此外，一系列原位 EPR 和实验结果表明，表面 OV 位点将作为功能位点捕获 O 原位FTIR显示，这些暴露的Ti原子将作为区分位点，特异性吸附苄胺分子，在界面上形成化学配位键-CNTi⋯，极化并激活苄胺中的-CN-键。此外，一系列原位 EPR 和实验结果表明，表面 OV 位点将作为功能位点捕获 O_2个来自空气的分子。此外，表面Pd位点将作为活性位点加速光生电子从内部转移到界面，诱导吸附的O ₂分子活化为O ₂ ^-。基于MTNs中的这些协同功能位点，在分子尺度上讨论了一种可能的催化机制。这项工作突出了多功能光催化剂的合理构建以及表面配位和光催化的协同效应。