Figure 4
From: Reusable magnetite nanoparticles–biochar composites for the efficient removal of chromate from water
Cr K-edge XANES spectra of chromium references and Cr-loaded MNP–BC, MNPs and BC at different pH conditions (1) K2Cr2O7 standard; (2) 2 mM Fe+ 1 g L−1 BC at pH 7; (3) 4 mM Fe+ 1 g L−1 BC at pH 5; (4) 10 mM Fe+ 0.5 g L−1 BC at pH 5; (5) 10 mM MNP + 0.5 g L−1 BC at pH 7; (6) 10 mM MNP at pH 5; (7) 10 mM MNP at pH 7; (8) 1 g L−1 BC at pH 3; (9) 1 g L−1 BC at pH 2; (10) Cr(III) acetate standard and (11) Cr(OH)3 standard. Solid lines represent experimental data and dotted lines represent fit, respectively.
