Facile solid state synthesis of ZnO hexagonal nanogranules with excellent photocatalytic activity

- Rapid synthesis of ZnO nanogranules by facile solid state mixing method.
- Role of citric acid in the structural, textural and morphological properties of ZnO nanogranules.
- High crystallinity of ZnO nanogranules with excellent optical properties.
- Superb photocatalytic activity for dye degradation compared to the commercial ZnO.
- Highly reusable ZnO nanogranules for the degradation of industrial dyes.