One-pot soft integration fabrication of graphene-induced phase transition to form dimension control contact In2S3/G heterojunction hybrids for enhancing visible photocatalytic purification performances

Abstract

We report the synthesis of a series of graphene-induced self-assembly phase transformations of tetragonal β-In2S3 into cubic α-In2S3 at lower temperatures based on the principles of molecular and crystal engineering and a simple one-pot soft integration strategy based on wet chemistry. Controlled contact In2S3/G heterojunction hybrids with sizes ranging from 3D/2D to 2D/2D. In the process, the 3D petal-like In2S3 is transformed into 2D nanosheets grown on the 2D graphene "mat". Due to effective charge separation and close interfacial contact, the excellent visible catalytic purification performance for the degradation of organic pollutants, benzyl alcohol selective oxidation and reduction of Cr2O72- has been achieved. The significantly improved photocatalytic purification efficiency is mainly due to the graphene-induced phase transition which increases the number of active sites and strengthens the two-dimensional/two-dimensional contact of the interface, which promotes the effective transmission and separation of photo-excited carriers, thereby Effectively improve the photocatalytic purification ability. This research provides new insights for the preparation of high-efficiency graphene-based nano-hybrid photocatalysts with controllable structure through rational use of the structure-oriented and induced phase transition effects of graphene, and expands its visible light catalytic purification applications.