Different bonding modes modulate the structure and properties of g-C3N4-Based materials

Composite precursors with hydrogen bonding interactions (Fe(OH) 3 /DCDA) and chemical bonding interactions (Fe(OH) 3 /PA/DCDA) were constructed by simple hydrothermal method , respectively, and then the corresponding photocatalysts (Fe 2 O 3 /g-C 3 N 4 and Fe 2 O 3 /C/g-C 3 N 4 ) were calcined under N 2 atmosphere to study the effect of different bonding types of precursors on the structure and performance of the photocatalysts. It is shown that the strong chemical bonding interaction between -CHO in Fe(OH) 3 /PA and -NH 2 in DCDA causes the calcined Fe 2 O 3 /C/g-C 3 N 4 to exhibit a lower density of terminal amino defects compared to the weak hydrogen bonding interaction, which greatly facilitates the photogenerated electron-hole separation. In addition, the strong chemical bonding interactions in the precursors would also cause incomplete polymerization during calcination , leading to the formation of porous structures in the catalyst Fe 2 O 3 /C/g-C 3 N 4 , which increases the specific surface area on the one hand and enhances the photoavailability on the other. Therefore, the prepared Fe 2 O 3 /C/g-C 3 N 4 has good photocatalytic activity and can degrade 51.28 % of MB solution after 60 min of continuous irradiation under visible light , which is 2.8 times higher than that of g-C 3 N 4 .