Adsorption isotherm and kinetic study of gas-solid system of formaldehyde on oil palm mesocarp bio-char: Pyrolysis effect

The kinetic and isotherm studies of gas-solid system were represented by oil palm mesocarp bio-char as adsorbent and formaldehyde as adsorbate. Three kinetic model; i.e pseudo-first-order, pseudo-second-order and Elovich model and three isotherm model; Le. Langmuir, Freundlich and Temkin isotherm were applied to evaluate the applicability of the equilibrium experimental data and the pyrolysis effect was studied. As a result, oil palm fiber carbonized at 500 degrees C and 700 degrees C was best presented by the Langmuir isotherm and oil palm mesocarp carbonized at 600 degrees C and 800 degrees C followed Temkin and Freundlich model, respectively. The formaldehyde adsorption was found favorable to happen at 25 degrees C with initial concentration of 0.5 ppm, 0.9 ppm, 0.75 ppm and 2.1 ppm as the Langmuir dimensionless constant, RL gave the value of 0 < R-L < 1. Carbonization temperature of 500 degrees C, 600 degrees C, and 700 degrees C was kinetically presented by pseudo-first-order kinetic equation and carbonization temperature of 800 degrees C followed Elovich equation. As a conclusion, the pyrolysis of oil palm mesocarp does affect the isotherm and kinetic behavior of formaldehyde adsorption on oil palm char.