Abstract
The aim of this work is the preparation of activated carbon from coffee grounds waste in order to use it as adsorbent in the removal of Paracetamol (PCM) largely existing in wastewaters rejected by pharmaceutical industries.The coffee ground was used in three forms: natural state (NAC), thermally activated at 450 °C (TAC) and chemically activated in the presence of phosphoric acid (CAC). The three biomaterials were analyzed by XRD, FTIR, SEM and BET in order to identify eventual structural and adsorptive characteristics. The specific area has significantly increased from 102.2 m2/g for NAC to 648.6 and 888.1 m2/g for TAC and CAC, respectively.The adsorption tests showed a very remarkable solid-liquid affinity with the following efficiency sequence: CAC < TAC < NAC with the elimination rates of 98, 35, 34 % and 20 %, respectively. The isotherm adsorption is in accordance with the Freundlich model, indicating heterogeneity of the biomaterial and the multi cover layers character of PCM adsorption.
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