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.
The micelle structural Entinostat is easily reflected by its degree of viscoelasticity due to the molecular rearrangement between different micelle structures . Rheological measurement is one of the best methods to follow the extent of the structural transformation. As per our previous report, the long TLM (top layer) was found to be approximately 4 times more viscoelastic than the WLM before sonication. On the other hand, the TM (bottom layer) was found to possess viscosity almost similar to that of water. The transformed structure was irreversible upon heating . This is an advantage to EOR process as the surfactant will not lose its surface activity at the high temperature conditions in the reservoir . Losing its surface activity results in decreasing efficiency in oil recovery . Therefore, the ability of US to cater second law of thermodynamics (entropy) reaction may be a breakthrough for applications in industries such as EOR and need to be understood well. For this reason, experiments with varying sonication parameters, viz., a range of ultrasonic frequency at the same power, and with horn and plate type transducers, were carried out in order to expand the knowledge base. The power was fixed at 40 W and the temperature was maintained at 30 °C. The images and the viscosity values of the final solution are shown in Fig. 2.