**6. Future perspectives**

Incorporation of GO with different semiconductor, metal nanostructures, and complexes allows the design of many generations of photocatalyst systems. In addition, great opportunities still exist in the exploitation of novel GO base hybrids and composites photocatalyst. Dual function photocatalysis that can perform multitasks simultaneously represents the greatest future trend along with the discovery of new materials. This is not a fantasy; previously a dual-functional photocatalysis was introduced based on a ternary hybrid of TiO2 modified with GO along with Pt and fluoride for both H<sup>2</sup> -producing water treatment and degradation of organic pollutants [66]. The positive effect of GO on the dual photocatalytic activity was observed only when Pt and surface fluoride were co-present.
