Abstract
Activated carbon is used like adsorbent in removing gaseous and liquid pollutants besides purification and chemical recovery. However, its production has a high cost and has sought alternative precursors materials such as coffee grounds. The objective of this study was to determine the removal of caffeine in aqueous solution using activated carbon produced from coffee grounds by adsorption. The coffee grounds was impregnated with ZnCl2 and activated in aluminum capsules where it was used alcohol cotton and put fire to consume the oxygen inside. The adsorption test was performed with concentration of caffeine of 25 mg/L, 0.5 g of activated carbon in 100 mL samples, leaving the suspension under stirring for 120 minutes, in acid, neutral and basic pH. The pH range which obtained better removal was the neutral, removing 99.04% caffeine in 40 minutes. The kinetic test was performed in 20 minutes with the intraparticle model being the best fit.
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