It is very important to design excellent heterojunction structure for the improvement of the photocatalytic performance. In this study, we report a facile approach of polymerizing the ultrathin graphene oxide on the surface of the MIL-88A(Fe) to form MIL-88A(Fe)/grapheme oxide composite for enhancing the photocatalytic efficiency of organic molecules degradation. The optical grapheme oxide doping content in MIL-88A(Fe)/grapheme oxide hybrid is determined to be 9.0 wt%，which increases the surface area of the MOFs from 15.9 m²g⁻¹ to 408.9 m²g⁻¹ due to the emerging micropores, and the corresponding photocatalytic rate for RhB is 8.4 times higher than that of pure MIL-88A(Fe). Meanwhile, DMF-free MOF-based heterostructure could avoid secondary contamination in the photocatalytic application process, and the degree of RhB removal is maintained at about 100% after the five cycles of the reaction. Integrating the related electrochemical analysis and the active species trapping experiments, the decisive factors for the improved photocatalytic efficiency of MIL-88A(Fe)/grapheme oxide may be the unique structural advantages of ultrathin grapheme oxide sheets, compact and uniform interface contact, more adsorption sites and more reaction sites. This work provides a novel sight for preparing high-efficient and environment-stable photocatalysts by designing the surface heterojunction structure.

设计优异的异质结结构对于提高光催化性能非常重要。在这项研究中，我们报告了一种在MIL-88A（Fe）表面聚合超薄氧化石墨烯以形成MIL-88A（Fe）/氧化石墨烯复合物的简便方法，以增强有机分子降解的光催化效率。确定MIL-88A（Fe）/氧化石墨杂化物中的光学氧化石墨烯掺杂含量为9.0 wt％，这会使MOF的表面积从15.9 m ² g ^-1增加到408.9 m ² g ^-1由于出现了微孔，因此RhB的相应光催化速率比纯MIL-88A（Fe）高8.4倍。同时，不含DMF的基于MOF的异质结构可以避免光催化应用过程中的二次污染，并且在五个反应周期后，RhB的去除率保持在100％左右。综合相关的电化学分析和活性物种捕获实验，决定MIL-88A（Fe）/氧化石墨烯光催化效率提高的决定性因素可能是超薄氧化石墨烯薄板的独特结构优势，紧凑而均匀的界面接触，更多的吸附部位和更多反应部位。这项工作为通过设计表面异质结结构制备高效且环境稳定的光催化剂提供了新颖的视野。