C-, N-Vacancy defect engineered polymeric carbon nitride towards photocatalysis: viewpoints and challenges

Abstract

As an alluring metal-free polymeric semiconductor material, graphite-like carbon nitride (g-C3N4; abbreviated as GCN) has triggered a new impetus in the field of photocatalysis, mainly favoured from its fascinating physicochemical...

Recent advances in bismuth oxyhalide photocatalysts for degradation of organic pollutants in wastewater

“…1c, BiOX heterojunctions can be classied into Type I, Type II and Type Z. 11,12 From a Type I heterojunction, the electrons and holes transfer to the CB and VB of B from substance A, and the electrons in the CB and holes in the VB participate in the redox reaction. From a Type II heterojunction, the electrons transfer to the CB of B from substance A, and the holes transfer to the VB of A from B, and the electrons in the CB of B and holes in the VB of A participate in the redox reaction.…”

Effect of the Oxygen Vacancies in CeO2 by the Ce3+ Incorporation to Enhance the Photocatalytic Mineralization of Phenol

“…By inducing an anion vacancy in a semiconductor photocatalyst, the bandgap of the pristine photocatalyst is modulated by the introduction of mid-gap states which extends the absorption of light by narrowing the bandgap energy. [8] The chemical doping for tuning the surface and bulk of CeO 2 has been developed in order to enhance its photocatalytic performance, [9] dopants may facilitate the separation of photogenerated charge carriers and promote the formation of oxygen vacancies. [5] Especially, the CeO 2 defects, such as oxygen vacancies, are the most reactive sites on its surface to promote catalytic and photocatalytic reactions.…”

Electrostatic interaction mechanism of visible light absorption broadening in ion-doped graphitic carbon nitride

“…Up to now, there have been several strategies to tune the electronic structure of CN to achieve higher visible light photoactivity. [7][8][9][10][11][12][13][14] Among them, doping metal or nonmetal elements into CN has been frequently utilized to prepare modied CN with extended visible light response. [12][13][14] In the case of Odoping, a H 2 O 2 hydrothermal treatment of pristine CN was usually carried out, where H 2 O 2 is used to generate oxygencontaining groups so as to modulate the electronic conguration of O-doped CN.…”