▎ 摘　　要

Herein, an intelligent, sunlight active photocatalyst, GR-HAP has been developed by synthetic modification of graphene (GR) nanosheets through in-situ deposition of hydroxyapatite (HAP). The photocatalytic efficiency of GR-HAP was evaluated by degradation of industrially important and versatile used azo dyes, viz., methyl orange, methylene blue and rhodamine B under illumination to natural sunlight. GR-HAP was capable in complete degradation of all dyes in presence of sunlight. It was estimated that with GR-HAP, rate for degradation of anionic dye, methyl orange was higher than cationic dyes, methylene blue and rhodamine B. Further, degradation rate of dyes was quantified using Langmuir-Hinshelwood (L-H) model and it found that degradation of dyes proceed through pseudo-first-order reaction. In addition to excellence in photocatalytic activity, GR-HAP possessed prominent stability against photocorrosiveness and photobleaching.