Ultrathin graphene oxide encapsulated in uniform MIL-88A(Fe) for enhanced visible light-driven photodegradation of RhB
Ultrathin graphene oxide encapsulated in uniform MIL-88A(Fe) for enhanced visible light-driven photodegradation of RhB
复制标题
超薄氧化石墨烯封装在均匀的 MIL-88A(Fe) 中，用于增强可见光驱动的 RhB 光降解
DOI：
10.1016/j.apcatb.2017.09.020
复制
发表时间：
2018-02-01
影响因子：
22.1
通讯作者：
Wu, Minghong
中科院分区：
文献类型：
--
作者：
Liu, Ning;Huang, Wenyuan;Wu, Minghong
设计优良的异质结结构对光催化性能的提高至关重要。在本研究中，我们报道了一种简便的方法，在MIL-88A(Fe)表面聚合超薄石墨烯氧化物，形成MIL-88A(Fe)/氧化石墨烯复合材料，以提高有机分子的光催化降解效率。结果表明，MIL-88A(Fe)/氧化石墨烯杂化材料的光学氧化石墨烯掺杂量为9.0wt%，微孔的出现使MOF的比表面积从15.9m(2)g(-1)增加到408.9 m(2)g(-1)，对RhB的光催化活性是纯MIL-88A(Fe)的8.4倍。同时，不含DMF的MOF基异质结构可以避免光催化应用过程中的二次污染，反应5个循环后，RhB的去除程度保持在100%左右。结合相关的电化学分析和活性物种捕获实验，MIL-88A(Fe)/石墨烯氧化物光催化效率提高的决定性因素可能是其独特的结构优势，即超薄的石墨烯氧化物薄膜、致密而均匀的界面接触、更多的吸附中心和更多的反应中心。本工作通过设计表面异质结结构，为制备高效、环境稳定的光催化剂提供了新的思路。
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 m(2)g(-1) to 408.9 M(2)g(-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.