b-In 2 S 3 superstructure comprised of nanoflakes with the sizes of 200-450 nm has been synthesized by a facile reflux method with the assistance of the sodium dodecylsulfate at low temperature (80°C). XRD, SEM, TEM, HRTEM, and UV-vis spectra were used to characterize the In 2 S 3 superstructure. Prepared In 2 S 3 superstructures exhibited high photocatalytic activities in the degradation of rhodamine B under visible light irradiation (k [ 420 nm), in which 97.5% RhB was photodegraded after 60 min.