Sunlight, UV, microwave, Vitamin C, ... list is pretty exhaustive.. see this review paper:
doi:10.1016/j.carbon.2011.11.010
you can go for method as suggested by Sridhar Vadahanambi Sir.
People now a days started to used greener route for the reduction of GO to Graphene , and those are environment friendly. But about quality and yield of graphene I doubt.
For better quality graphene i think reducing chemical may be suitable with precaution.
People are showing Some plant leaves have chemical that shows very high reducing ability. But that need to be generalized. Mechanistic aspect is not much clear till now.
Have a look on below papers
A green reduction of graphene oxide via starch-based materials
A green approach for the reduction of graphene oxide nanosheets using non-aromatic amino acids
As Sridhar Vadahanambi said eralier and according to recent studies UV light and Vitamin C are considered as environmental friendly reducing agent for Graphene oxide. But In my opinion Chemical reducing agent are more effective.
I prefer solar-thermal reduction and electrochemical method as green and energy saving approaches.
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