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

Figure 22

Effect of different concentrations of NH₄Br (1 = 0, 2 = 2, …, 10 = 10 mM) on the rate of formation of bromophenol blue after 10 minutes. Reaction conditions are as follows: 10 ml of 1.0 mM phenol red in water + 10 ml of 10.0 mM NH₄Br in water + 0.5 g of catalyst + 2.5 mM H₂O₂, in a round-bottomed flask. T = 298 K and  atm.