Alhaddad Maha, Mohamed Reda M, Mahmoud Mohamed H H
Department of Chemistry, Faculty of Science, King Abdulaziz University, P.O. Box 80203, Jeddah 21589, Kingdom of Saudi Arabia.
Advanced Materials Department, Central Metallurgical R&D Institute (CMRDI), P.O. Box 87, Helwan, Cairo 11421, Egypt.
ACS Omega. 2021 Mar 17;6(12):8717-8725. doi: 10.1021/acsomega.1c00697. eCollection 2021 Mar 30.
The production of hydrogen using a new type of heterogeneous photocatalyst under visible light is considered a remarkable essential pathway for sustainable, pure energy not only on the laboratory scale but also on a bigger scale. Hence, a new nanocomposite of mesoporous MnCoO, g-CN, and MnCoO@g-CN was produced utilizing a sol-gel method with variable MnCoO contents. The crystal structure of MnCoO was effectively confirmed by the X-ray diffraction pattern and integrated onto the g-CN structure. The MnCoO nanoparticles were displayed as spherical particles by TEM images and dispersed in a uniform way inside the g-CN nanosheet. The synthesized nanocomposites in the form of MnCoO@g-CN were examined as a new effective photocatalyst against glycerol as a source for H production with visible light. The MnCoO contents indicated a corroborative impact for the photocatalytic action related to the H production process. A maximum H production molecular value was observed (21,870 μmol·g·h) for a 1.5 wt % MnCoO@g-CN nanocomposite as a considerable increase in its photocatalytic activity. The yields of H are ∼55 and 23 times higher than those of g-CN and MnCoO, respectively. Up to five times cycles of visible lighting were the maximum number of repeated cycles by which the 1.5 wt % MnCoO@g-CN product showed higher stability and durability.
利用新型多相光催化剂在可见光下制氢，不仅在实验室规模，而且在更大规模上，都被认为是实现可持续纯能源的一条重要途径。因此，采用溶胶 - 凝胶法制备了具有可变MnCoO含量的介孔MnCoO、g-CN和MnCoO@g-CN新型纳米复合材料。通过X射线衍射图谱有效确认了MnCoO的晶体结构，并将其整合到g-CN结构上。TEM图像显示MnCoO纳米颗粒为球形颗粒，并以均匀的方式分散在g-CN纳米片内。以MnCoO@g-CN形式合成的纳米复合材料作为一种新型有效的光催化剂，用于以甘油为产氢源的可见光产氢研究。MnCoO含量对与产氢过程相关的光催化作用具有促进作用。对于1.5 wt%的MnCoO@g-CN纳米复合材料，观察到最大产氢分子值为(21,870 μmol·g·h)，其光催化活性显著提高。产氢量分别比g-CN和MnCoO高出约55倍和23倍。1.5 wt%的MnCoO@g-CN产物在可见光照射下最多可重复循环五次，表现出较高的稳定性和耐久性。
