Both the adsorptive removal of small amounts of toluene from water and small amounts of water from toluene are important in the process industries. Activated carbon is particularly effective for removing soluble organic compounds (SOCs) from water. Activated alumina is effective for removing soluble water from toluene. Fit each of the following two sets of equilibrium data for 25°C to both the Langmuir and Freundlich isotherms. For each case, which isotherm provides the better fit? Could a linear isotherm beused?

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Toluene (in Water) Water (in Toluene) Activated Carbon Activated Alumina c, mg/L q, mg/g 9. g/100g c, ppm (by Weight) 0.01 12.5 25 1.9 0.02 17.1 50 3.1 23.5 4.2 0.05 75 30.3 0,1 100 5.1 6.5 0.2 39.2 150 54.5 200 8.2 0.5 90.1 250 9.5 1 70.2 10.9 300 125.5 350 12.1 13.3 10 165 400