The present invention relates to a coating composition comprising graphene oxide nanoparticles, with other constituents comprising globular protein, plasticizer, thickener, filler, fungicide, and water. The present also relates to a coated paper pulp comprising the coating composition. These coated paper pulp can be used to make articles that can be alternatives to plastics, such as a bottle which is biodegradable as well as water proof. These articles are compostable and ecofriendly. The invention also provides method of preparing the coated paper pulp articles.