Design and Synthesis of Reusable Nanoparticles for Reversible Chemisorption of Hexavalent Chromium Anions from Aqueous Media and Catalysis

Figure 14

(a) Magnetic separation of a sample after reaction; (b) sample prepared for UV analysis using 1,5-diphenylcarbazide reagent. (c) A sample reduced from an initial concentration of 100 ppm to 0 ppm Cr(VI) with Fe₃O₄@SiO₂@LEuH@PW₁₀ after 1 hour reaction time at 24°C and pH 6; dilution factor = 20.