Ding Xin, Liu Hongli, Chen Jiangyao, Wen Meicheng, Li Guiying, An Taicheng, Zhao Huijun
Guangdong Key Laboratory of Environmental Catalysis and Health Risk Control, Guangzhou Key Laboratory Environmental Catalysis and Pollution Control, School of Environmental Science and Engineering, Institute of Environmental Health and Pollution Control, Guangdong University of Technology, Guangzhou 510006, China.
Centre for Clean Environment and Energy, and Griffith School of Environment, Gold Coast Campus, Griffith University, Queensland, 4222, Australia.
Nanoscale. 2020 May 7;12(17):9462-9470. doi: 10.1039/d0nr01027h.
Exploitation of highly efficient catalysts for photocatalytic degradation of volatile organic compounds (VOCs) under visible light irradiation is highly desirable yet challenging. Herein, well-aligned 2D Ni-MOF nanosheet arrays vertically grown on porous nickel foam (Ni-MOF/NF) without lateral stacking were successfully prepared via a facile in situ solvothermal strategy. In this process, Ni foam could serve as both a skeleton to vertically support the Ni-MOF nanosheets and a self-sacrificial template to afford Ni ions for MOF growth. The Ni-MOF/NF nanosheet arrays with highly exposed active sites and light harvesting centres as well as fast mass and e- transport channels exhibited excellent photocatalytic oxidation activity and mineralization efficiency to typical VOCs emitted from the paint spray industry, which was almost impossible for their three-dimensional (3D) bulk Ni-MOF counterparts. A mineralization efficiency of 86.6% could be achieved at 98.1% of ethyl acetate removal. The related degradation mechanism and possible reaction pathways were also attempted based on the electron paramagnetic resonance (EPR) and online Time-of-Flight Mass Spectrometer (PTR-ToF-MS) results.
开发用于在可见光照射下光催化降解挥发性有机化合物（VOCs）的高效催化剂是非常有必要的，但也具有挑战性。在此，通过一种简便的原位溶剂热策略成功制备了垂直生长在多孔泡沫镍（Ni-MOF/NF）上且无横向堆叠的排列良好的二维Ni-MOF纳米片阵列。在此过程中，泡沫镍既可以作为垂直支撑Ni-MOF纳米片的骨架，又可以作为自牺牲模板为MOF生长提供镍离子。具有高度暴露的活性位点、光捕获中心以及快速的质量和电子传输通道的Ni-MOF/NF纳米片阵列对喷漆行业排放的典型VOCs表现出优异的光催化氧化活性和矿化效率，而其三维（3D）块状Ni-MOF对应物几乎无法做到这一点。在去除98.1%的乙酸乙酯时，矿化效率可达86.6%。还基于电子顺磁共振（EPR）和在线飞行时间质谱仪（PTR-ToF-MS）结果尝试了相关的降解机理和可能的反应途径。
