Research on the techniques of ultrasound-assisted liquid-phase peeling, thermal oxidation peeling and acid-base chemical peeling for ultra-thin graphite carbon nitride nanosheets

Abstract

Graphite phase carbon nitride (g-CN) composite structure materials, as a kind of stable compound with graphite-like structure, has attracted more and more attention due to its excellent properties, such as being able to absorb solar energy, stable chemical and optical properties and having a suitable oxidation potential. However, its application in the field of photocatalysis is limited by its small specific surface area and poor dispersibility. To solve this problem, ultra-thin g-CN nanosheets are often prepared using peeling methods. In this paper, the current status and mechanism of thermal oxidation peeling, ultrasound-assisted liquid-phase peeling and acid-base chemical peeling are reviewed in detail. In addition, the future research directions of ultra-thin graphite-like carbon nitride nanosheets are discussed.

Impact of graphitic carbon nitrides synthesized from different precursors on Schottky junction characteristics

“…A series of graphitic carbon nitrides were synthesized from the most commonly used precursors in literature, which are melamine, urea, thiourea, and guanidine hydrochloride, using the same thermal polycondensation method [32]. It is known that prolonged reaction time causes thermal oxidation process which resulted exfoliation of the bulk carbon nitrides into smaller sheets (thermal exfoliation) [33,34]. Therefore, g-CNs were synthesized by the method used for the thermally exfoliated g-CN with the highest surface area, ever [32].…”

Sodium alkoxide-mediated g-C3N4 immobilized on a composite nanofibrous membrane for preferable photocatalytic activity

“…The question is whether the carbon nitride by soaking can be exfoliated in alkaline environments for photocatalysis. [39][40][41][42] Interestingly, Sano and co-workers have treated g-C 3 N 4 by hydrothermal method with sodium hydroxide, resulting in a porous structure with eight times surface area bigger than that of bulk g-C 3 N 4 . 43 Herein, we present a series of sodium alkoxide-mediated (MeONa, EtONa, and t BuONa) g-C 3 N 4 photocatalysts for fabricating exible electrospun polyacrylonitrile nanobers (Scheme 1).…”

Effective separation of Oil-in-Water using exfoliated g-C3N4- PSf composite membranes

“…The layered structures of g-C 3 N 4 are connected to each other by Van der Waals force of attraction due to the π-π-stacking that is observed between the triazine ring systems. These ring systems consist of sp 2 hybridized C-N bond forming an aromatic π-conjugation 10 . This structural feature of g-C 3 N 4 ensures thermochemical stability in both acidic and basic pH.…”