Effect of initial Cr VI ions concentration

2.6. Effect of initial Cr(VI) ions concentration
In order to investigate the effect of initial solution concentration of Cr(VI) ions on the adsorption process, different Cr(VI) AZD 7762 solutions at optimum pH value (3.0) with concentration in the range from 50 to 500 mg/L were prepared. Then 0.1 g of MNP@PDA was added into each centrifuge tube containing 10 mL of prepared Cr(VI) ions solution. After mixing the solution for 24 h, the concentration of Cr(VI) ions in the solution was measured.
2.7. Effect of adsorbent dosage
The percentage removal of Cr(VI) ions was studied at different adsorbent dose varying between 2.5 and 20 g/L. For this purpose, different amounts of the adsorbent (0.025, 0.05, 0.10, 0.15 and 0.20 g) were dispersed in 10 mL of Cr(VI) solution (100 mg/L). The adsorption experiments were carried out at a pH value of 3.0. After stirring the mixture for 24 h, the concentration of Cr(VI) ions in the solution was measured by spectrophotometer.