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. 2017 Jun 21;7:3934. doi: 10.1038/s41598-017-04339-8

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© The Author(s) 2017

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Illustration of the high symmetry adsorption sites. Neutral atoms and charged ions of heavy metals are placed at the (a) on-top (T), (b) bridge (B), and (c) hollow (H) sites on the hexagonal cell, as well as, on a defect (D) site (d) of graphene sheet (substitutional defect).