(495f) Adsorption for Dibenzothiophene On Activated Carbons Modified by Oxygen Plasma

in this workCthe effect of oxygen plasma of activated carbon (AC) surface on its adsorption of dibenzothiophene (DBT) was investigated. ACs were treated by low temperature oxygen plasma, and then the surface area and pore structure of different ACs were characterized. The type and concentration of oxygen functional groups on the ACs were determined by Diffuse Reflectance Infrared Fourier Transform Spectroscopy (DRIFTS) and Boehm titration respectively. Static equilibrium adsorption experiments were conducted to determine the isotherms of DBT on the original and modified ACs. Results showed that after oxygen plasma treatment of carbon surfaces, its surface area decreased, and the concentration of oxygen-containing groups, especially the carboxylic groups increased. The more the amounts of carbon surface acidic oxygen-containing groups got by oxygen plasma treatment were, the higher the amounts adsorbed of DBT on its surface wereishown in figure 1j. For the original AC, AC30, AC60 and AC120, the breakthrough amount of the treat fuel with containing 320 mg-S/l was 35.5, 48, 51.5 and 53 ml-Fuel/g-A, respectively, corresponding to the breakthrough capacity of 11.4, 15.4, 16.5 and 17 mg of sulfur per gram of adsorbent (mg-S/g-A). The adsorption capacity of the AC30, AC60 and AC120 for DBT increased separately by 35.1%, 44.7% and 49.1% compared to the original ACishown in figure 2j.