Key Laboratory of Bio-based Material Science and Technology, Ministry of Education, Material Science and Engineering College, Northeast Forestry University, Harbin, 150040, China.
College of Chemistry, Chemical Engineering and Resource Utilization, Northeast Forestry University, Harbin, 150040, China.
Chemosphere. 2020 Nov;259:127389. doi: 10.1016/j.chemosphere.2020.127389. Epub 2020 Jun 15.
Metal-organic frameworks (MOFs) are promising for photocatalysis owing to their excellent structure and performance. Unfortunately, poor stability in both aqueous solutions and high temperatures and lack of adsorption centers during reactions limit their practical applications. Herein, a bimetallic MOF anchored corncob calcined derived activated carbon (CCAC) was successfully prepared by a one-step solvothermal method. Benefiting from unique structures and synergetic effect, the porous carbon provided a high specific surface area for stable MOF support and served as an organic pollutant buffer-reservoir, which was advantageous for efficient photocatalytic degradation of organic pollutants. The optimized MOF/CCAC-5 samples possessed excellent visible light degradation rate, i.e., 100% for Rh B, more than 96% for six mixed dyes, and 98% for tetracycline. This prominent photocatalytic activity was caused by active species, including photoelectrons (e), photo-holes (h) and superoxide free radicals (•O). The transient photocurrent response and electrochemical impedance tests showed that MOF/CCAC-5 exhibited a relatively high charge separation and low carrier recombination rate. Cyclic and simulation experiments indicated high reusability, stability and universality of the composite photocatalysts. These exciting results provide new pathways for the fabrication of MOFs anchored porous carbon materials.
金属-有机骨架（MOFs）因其优异的结构和性能而在光催化中具有广阔的应用前景。然而，其在水溶液和高温条件下的稳定性差以及反应过程中缺乏吸附中心等问题限制了其实际应用。在此，通过一步溶剂热法成功制备了一种双金属 MOF 锚定的玉米芯烧制衍生活性炭（CCAC）。得益于独特的结构和协同效应，多孔碳为 MOF 的稳定支撑提供了高比表面积，并作为有机污染物的缓冲库，有利于有机污染物的高效光催化降解。优化后的 MOF/CCAC-5 样品具有出色的可见光降解率，例如 Rh B 的降解率为 100%，六种混合染料的降解率超过 96%，四环素的降解率为 98%。这种突出的光催化活性归因于活性物质，包括光电子（e）、空穴（h）和超氧自由基（•O）。瞬态光电流响应和电化学阻抗测试表明，MOF/CCAC-5 表现出相对较高的电荷分离和较低的载流子复合速率。循环和模拟实验表明，该复合材料光催化剂具有较高的可重复使用性、稳定性和通用性。这些令人兴奋的结果为制备 MOFs 锚定多孔碳材料提供了新途径。
