▎ 摘　　要

NOVELTY - Preparation of naturally doped silicon, magnesium and calcium graphene nanosheets from paper waste, involves cutting waste paper into fine shape (11.2 mm length and 5.75 mm width) by using a shredder unit; soaking shredded flakes of the waste paper into distilled water and stirring for 2 minutes using a vertically aligned stirrer to remove dust and other impurities and thus lifting up manually by using a filtration net with a pore size of 500 mu m; soaking the soaked and washed paper flakes for another 30 minutes in the mixture of methanol (200 ml), ethanol (300 ml) and distilled water (2.5 liters) and heating gently for 30 minutes at 60 degrees C; and rinsing gently obtained dense slurry of the solvent mixed paper and performing slow pyrolysis using a reactor made up of stainless steel with the capacity of the 0.41 m3 in the inert atmosphere of nitrogen (N2) gas (20 ml/minute) at 350 degrees C with the heating rate of 5 degrees C per minute for 70 minutes. USE - The process is useful for preparation of naturally doped silicon, magnesium and calcium graphene nanosheets from paper waste (claimed). ADVANTAGE - The process shows the utility of pyrolysis techniques to develop scalable and green synthesis of naturally doped graphene nanosheets with Si, Mg and Ca. Further, it shows the applicability of methanol and ethanol to develop large area naturally doped graphene nanosheets with Si, Mg and Ca.