Novel HSbO3/graphitic carbon nitride (HSbO3/g-C3N4) heterojunction photocatalysts were synthesized via a simple method. The prepared HSbO3/g-C3N4 samples were characterized by X-ray powder diffraction (XRD), transmission electron microscopy (TEM), high-resolution transmission electron microscopy (HRTEM), ultraviolet-visible diffuse reflection spectroscopy (DRS) and photoluminescence spectroscopy (PL). The photocatalytic activity of as-synthesized samples was evaluated by degrading Rhodamine B (RhB) in aqueous solution under visible-light irradiation. All the HSbO3/g-C3N4 heterojunction photocatalysts showed much higher visible-light photocatalytic activity than those of pure g-C3N4, HSbO3 for the degradation of RhB. The enhanced photocatalytic activity is mainly ascribed to the enhancement of electron-hole separations at the interface of the two semiconductors. This study offers a new class of highly efficient and promising heterojunction photocatalysts. (C) 2015 Elsevier B.V. All rights reserved.