Magnetite-Functionalized Horse Dung Humic Acid (HDHA) for the Uptake of Toxic Lead(II) from Artificial Wastewater

Figure 5

Regeneration study of MHDHA and pH change in each cycle (a); diffractogram of MHDHA (b); and FT-IR spectra after the first (MHDHA-Cy1), third (MHDHA-Cy3), and fifth cycle (MHDHA-Cy5) adsorption-desorption process (c); comparison of morphology and composition by SEM-EDX of original MHDHA (d); and that of MHDHA-Cy5 (e).

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