Abstract
A new type of activated carbon (Bergamot-Based Activated Carbon, BAC) was prepared and oxidized by peracetic acid. The modified BAC was characterized by N2 adsorption, FT-IR, and base titration analyses. The results show that after modification by concentrated peracetic acid for 18 h at 25°C, the obtained materials show increase in pore volume from 0.55 mL/g to 1.73 mL/g, specific surface area from 1,874 m2/g to 2,736 m2/g, and the density of acidic surface oxygen complexes (C˭O, C-OH, and COOH) from 0.78 mmol/g to 2.23 mmol/g. IR and base titration results indicated that thiophene reacts with carbonyl groups to form phenols during desulfurization. Batch test results showed that the modified BACs show a good thiophene capture performance at 30°C under the stirring speed of 250 rpm/min, the adsorbents/fuel ratio of 1/20, and reaction time of 30 min. The equilibrium adsorption data were well represented by the Langmuir isotherm equation. The maximum sulfur adsorption capacity of oxidation treated sample is 43.12 mg/g, which is superior to the most carbonaceous materials reported in the literature. The saturated adsorbents can be regenerated with stripping with alcohol solution and nearly 100% of the desulfur capacity was recovered after regeneration.
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