Fig. 5From: Melanin-embedded materials effectively remove hexavalent chromium (CrVI) from aqueous solutionEffect of pH (a), sorption time (b), solid/liquid (c), and CrVI initial concentration (d) on sorption efficiency of CrVI on CMB and IMB. *, **, and *** Significant difference (p < 0.05, 0.01 and 0.001, respectively) between IMB and CMB by the Student’s t testBack to article page