Chrysanthemum-like sulfur (VI) modified graphite carbon nitride (s/g-C3N4) was synthesized by sulfuring and sonicating bulk g-C3N4 at 800 kHz. The sulfuring relaxed the interlayer force of g-C3N4, and the sonication constructed its chrysanthemum-like structure which enhances the separation of photo-generated carriers and photochemical response. Density functional calculation and diffusion reflection spectra (DRS) verified that sulfur (VI) modification shifted down the valence band edge of g-C3N4 and improved the redox potentials of g-C3N4. The photocatalytic degradation efficiency of 4-nitrophenol (10 mg L-1) by s/g-C3N4 was 49.3 times higher than that by bulk g-C3N4 under visible light irradiation (>400 nm). (C) 2017 Elsevier B.V. All rights reserved.