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CLASS PROBLEM-8, ChE422 & 542 On

Adsorption

Prob 1 Francisco did his final year research project batch experiment on Zn (II) adsorption on kaolin at a solution pH of 5.8. The reaction volume was 0.025 L and mass of adsorbent was 0.1 gram. He was reported the following kinetic experimental data on metal ion adsorption at two different initial metal ion concentration. Explain the effect of initial metal ion concentration on adsorption kinetics and justify the suitability of different kinetic models and find out adsorption capacity of adsorbent Table 1: Kinetic data Time in hr Amount of adsorption, qt (mg/g) Initial metal ion concentration

in mg/l (ppm) 0 1 2 3 4 5

0.0 0.8771 1.0479 1.1036 1.1138 1.1139

5.0

0 1 2 3 4 5

0 1.6465 2.0396 2.0625 2.0779 2.0778

10.0

Problem 2 Batch tests were performed in the laboratory using solutions of phenol in water and particles of granular activated carbon. The equilibrium data at room temperature are shown in the table below. Determine the isotherm that fits the data (This is class example problem) Table 2 Adsorption isotherm experimental data c (kg phenol/m3 solution)

q (kg phenol/kg carbon)

0.322 0.150

0.117 0.122

0.039 0.094

0.0061 0.059

0.0011 0.045