Improve photocatalytic performance of g-C3N4 through balancing the interstitial and substitutional chlorine doping

Mengyu Cao, Ke Wang, Ignacio Tudela, Xianfeng Fan*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

Abstract

Cl doped g-C3N4 with controllable doping site is synthesised for the first time via an agitation-assisted solvothermal method. It is found that both the molecular and electronic structure of the prepared g-C3N4 correlates strongly with the atomic ratio of interstitial to substitutional Cl dopants (Clint/Clsub), which is determined by the agitation rate during the solvothermal synthesis. Due to the different effects of Clint and Clsub on the electronic/molecular structure of g-C3N4, the photocatalytic activity of g-C3N4 can only be optimised by balancing the concentration of Clint and Clsub dopants. The optimal synthesis condition for Cl-doped g-C3N4 is associated with a moderate agitation rate of 60 rpm (60-C3N4). Under 60 rpm agitation during the synthesis, the 60-C3N4 exhibits remarkably larger specific surface area, stronger photo-oxidation capability, reduced bandgap and suppressed electron-hole recombination comparing with the control group g-C3N4 synthesised via conventional thermal polycondensation method. An outstanding photocatalytic RhB degradation performance is therefore observed for 60-C3N4 with ~ 35-fold higher pseudo-first reaction rate constant than the bulk g-C3N4 control group sample.
Original languageEnglish
Article number147784
Number of pages14
JournalApplied Surface Science
Volume536
Early online date9 Sep 2020
DOIs
Publication statusPublished - 15 Jan 2021

Keywords

  • Dopant site control
  • g-C3N4
  • Photocatalytic degradation
  • Interstitial Cl dopants
  • Substitutional Cl dopants

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