Coordination-driven synthesis of perfected π-conjugated graphitic carbon nitride with efficient charge transfer for oxygen activation and gas purification

Autor: Shujuan Jiang, Shaoqing Song, Zhanggao Le, Zhu Ye'an, Chuanbao Xiong
Rok vydání: 2019
Předmět:
Zdroj: Journal of Colloid and Interface Science. 538:237-247
ISSN: 0021-9797
DOI: 10.1016/j.jcis.2018.11.099
Popis: Efficient yield of reactive-oxygen species (ROS) is greatly important for environmental purification and engineering. In this study, the perfected π-conjugated g-C3N4 (PNa-g-C3N4) photocatalysts were constructed by coordination between 3p orbits of Na and N 2p lone electron at vacancy structure of tri-s-triazine polymer for ROS evolution and elimination of HCHO and NO. The perfected π-conjugated structure enhances the visible-light capturing capability, enriches active sites for O2 activation, and promotes the directional charge transfer from N 2p of C3-N to Na and C. Therefore, the superior activities including the evolution of O2− (35 µmol.L−1h−1), and H2O2 (517 µmol.L−1h−1) have been achieved over PNa-g-C3N4 photocatalyst. As a result, PNa-g-C3N4 photocatalysts demonstrate high performances removal efficiency of NO (53% for 6 min), and HCHO (almost 100% for 55 min) in the elimination process. The results may provide the promising strategy to construct efficient photocatalytic system to yield ROS for environmental purification.
Databáze: OpenAIRE