Synthesis and characterization of a magnetic adsorbent from negatively-valued iron mud for methylene blue adsorption - Fig 3

<p><b>XRD pattern of (A) MPs-1, MPs-2 and ferrihydrite, and (B) MPs-3w, MPs-3, MPs-4, MPs-5 and Iron mud.</b> MPs 1–5 were synthesized by changing the molar ratio of ascorbic acid to Fe³⁺ from 0.01 to 0.05, 0.1, 0.15 and 0.2. MPs-3w was prepared at the ratio of 0.1 with acid wastewater digestion.