We report the synthesis of PTh-rGO-Fe3O4 nanocomposite from a simple combination of graphene and polythiophene (PTh) with metal oxide for application as photocatalyst. The structure and morphology of the nanocomposite were studied by powder XRD, FTIR spectroscopy, Raman analysis, EDAX and TEM. The observed properties of the nanocomposite were fineset for the application in the field of photocatalyst. The photocatalytic effect was studied by utilizing the nanocomposite in water splitting for hydrogen production, degradation of Malachite green and shielding of Rose Bengal from UV degradation. The maximum quantum efficiency for hydrogen production obtained with 0.1% w/v of PTh-rGO-Fe3O4 photocatalyst was 11.48% with a hydrogen production rate of 178.4 mu mol/h. Furthermore, the photo catalyst shows 87.9% degradation of Malachite green and acts as an effective UV shielding layer preventing 53.09% degradation of Rose Bengal. This study reveals that our nanocomposite will be a better photocatalytic material. (C) 2017 Elsevier Ltd. All rights reserved.