Zhang Yue, Zhang Guo-Lei, Wang Yu-Ting, Ma Zhihan, Yang Tian-Yi, Zhang Tianhao, Zhang Ying-Hui
School of Materials Science and Engineering, Tianjin Key Laboratory of Metal and Molecule-Based Material Chemistry, National Institute for Advanced Materials, Nankai University, Tianjin 300350, China; Photonics Research Centre, School of Physics, The MOE Key Lab of Weak-Light Nonlinear Photonics, and Tianjin Key Laboratory of Photonics Materials and Technology for Information Science, Nankai University, Tianjin 300071, China.
School of Materials Science and Engineering, Tianjin Key Laboratory of Metal and Molecule-Based Material Chemistry, National Institute for Advanced Materials, Nankai University, Tianjin 300350, China.
J Colloid Interface Sci. 2021 Aug 15;596:342-351. doi: 10.1016/j.jcis.2021.03.104. Epub 2021 Mar 22.
The promising photocatalytic conversion of CO into valuable fuel promotes the development of photocatalyst through various methods. In this work, TiO nanoparticle was composited with covalent porphyrin polymers (COP-Ps) to fabricate composite photocatalysts. The resultant COP-Ps/TiO composites by in situ hydrothermal method exhibit much improved photocatalytic activity for the conversion of CO into CO relative to two components, and it is attributable to improved charge transfer between two moieties led by strong interaction. Especially, TiO is composited more evenly with the sulfonated hollow COP-P (sh-COP-P). The resultant composite sh-COP-P/TiO performs best with a CO production rate of 5.70 μmol·g·h, which is approximately 20.4 times as high as that of pure TiO and 2.3 times of sh-COP-P polymer. For comparison, the simple physical mixture of sh-COP-P and TiO (sm-sh-COP-P/TiO) was fabricated, and it performs more badly due to poor mixing uniformity. A Z-scheme photocatalytic mechanism was proposed for sh-COP-P/TiO composite on the basis of energy band analysis and hydroxyl radical test. This study provides a new in situ strategy to fabricate organic polymer/metal oxide composites of high photocatalytic activity for CO reduction.
将二氧化碳光催化转化为有价值的燃料这一前景广阔的研究推动了通过各种方法开发光催化剂。在这项工作中，二氧化钛纳米颗粒与共价卟啉聚合物（COP-Ps）复合以制备复合光催化剂。通过原位水热法制备的COP-Ps/TiO复合材料相对于两种组分而言，在将二氧化碳转化为一氧化碳方面表现出大大提高的光催化活性，这归因于强相互作用导致的两个部分之间电荷转移的改善。特别是，二氧化钛与磺化空心COP-P（sh-COP-P）的复合更为均匀。所得的复合sh-COP-P/TiO表现最佳，一氧化碳产率为5.70 μmol·g·h，约为纯二氧化钛的20.4倍，是sh-COP-P聚合物的2.3倍。作为对比，制备了sh-COP-P和二氧化钛的简单物理混合物（sm-sh-COP-P/TiO），由于混合均匀性差，其性能更差。基于能带分析和羟基自由基测试，为sh-COP-P/TiO复合材料提出了一种Z型光催化机理。该研究提供了一种新的原位策略，用于制备具有高光催化活性的有机聚合物/金属氧化物复合材料以用于二氧化碳还原。
