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2D/2D heterojunction photocatalyst of CdIn 2 S 4 on nitrogen doped reduced graphene (N-rGO) was fabricated by in situ hydrothermal method. It is noticeable that the flower-like CdIn 2 S 4 photocatalyst composed of film is controlled by the temperature of synthesis process. When CdIn 2 S 4 photocatalyst load on N-rGO, irregular film N-rGO functions as support to disperse the CdIn 2 S 4 , forming the 2D/2D interfacial structure, which is confirmed by SEM, TEM and HRTEM. When the mass fraction of N-rGO is 10%, the binary composite photocatalyst could photodegrade 80% 50 mg/L 2,4-dichlorophenol (2,4-DCP). That is because the heterojunction formed between CdIn 2 S 4 and N-rGO promotes the electron transfer, especially the interfacial contact region. What's more, the N-rGO can efficiently accumulate the 2,4-DCP molecules because of its unique structure, bettering the contact rate between 2,4-DCP and the whole photocatalyst. The possible mechanism of photodegrading 2,4-DCP was discussed and investigated. This work highlights the synergistic effect, especially the harmony between charge transfer and active sites to benefit the photocatalytic performance. A schematic of possible photocatalytic mechanism. Image 1 • 2D/2D CdIn 2 S 4 /N-rGO interfacial heterojunction photocatalyst was obtained by in situ hydrothermal method. • The as-prepared 2D/2D CdIn 2 S 4 /N-rGO materials exhibited extensively enhanced photocatalytic activity for the degradation of 2,4-DCP under visible light irradiation. • The possible process about irregular and looser CdIn 2 S 4 nanosheets formed was given. • Intimate 2D interfacial heterojunction gives more channels to transfer photogenerated carries and N-rGO supplies active sites, bettering photocatalytic performance. A possible mechanism of 2D/2D CdIn 2 S 4 /N-rGO photocatalyst for the enhancement of visible light performance was proposed. [ABSTRACT FROM AUTHOR]