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Synergistic effect of B. cereus and ZnO NPs (5, 10, 15, 20 and 25 mg/L) on the removal efficiency of (a) Lead (Pb), (b) Cadmium (Cd), (c) Chromium (Cr) and (d) Copper from the media amended with heavy metal at different pH (4, 5, 6, 7, 8, 9 and 10).
