| Autor: |
Cimirro NFGM; Postgraduate Program in Engineering, Federal University of Pampa (UNIPAMPA), Bagé, RS, 96412-420, Brazil., Lima EC; Federal University of Rio Grande do Sul (UFRGS), Porto Alegre, RS, Brazil., Cunha MR; Postgraduate Program in Engineering, Federal University of Pampa (UNIPAMPA), Bagé, RS, 96412-420, Brazil., Dias SLP; Federal University of Rio Grande do Sul (UFRGS), Porto Alegre, RS, Brazil., Thue PS; Federal University of Rio Grande do Sul (UFRGS), Porto Alegre, RS, Brazil., Mazzocato AC; Brazilian Agricultural Research Corporation (EMBRAPA-CPPSul), Bagé, RS, Brazil., Dotto GL; Chemical Engineering Department, Federal University of Santa Maria (UFSM), Santa Maria, RS, Brazil., Gelesky MA; School of Chemistry and Food, Federal University of Rio Grande (FURG), Rio Grande, RS, Brazil., Pavan FA; Postgraduate Program in Engineering, Federal University of Pampa (UNIPAMPA), Bagé, RS, 96412-420, Brazil. flaviopavan@unipampa.edu.br. |
| Abstrakt: |
In this work, lovegrass (Cpa), an abundant grass of the Poaceae family, was employed as feedstock for the production of activated carbon in a conventional furnace using ZnCl 2 as a chemical activator. The prepared material (Cpa-AC) was characterized by pH of the point of zero charges (pH pzc ), Boehm's titration method, CHN/O elemental analysis, ATR-FTIR, N 2 adsorption/desorption curves, and SEM. This carbon material was used for adsorption of acetylsalicylic acid (ASA) and sodium diclofenac (DFC). FTIR analysis identified the presence of O-H, N-H, O-C=O), C-O, and aromatic ring bulk and surface of (Cpa-AC) adsorbent. The quantification of the surface functional groups showed the presence of a large amount of acidic functional groups on the surface of the carbon material. The isotherms of adsorption and desorption of N 2 confirm that the Cpa-AC adsorbent is mesopore material with a large surface area of 1040 m 2 g -1 . SEM results showed that the surface of Cpa-AC is rugous. The kinetic study indicates that the system followed the pseudo-second-order model (pH 4.0). The equilibrium time was achieved at 45 (ASA) and 60 min (DCF). The Liu isotherm model best fitted the experimental data. The maxima sorption capacities (Q max ) for ASA and DFC at 25 °C were 221.7 mg g -1 and 312.4 mg g -1 , respectively. The primary mechanism of ASA and DFC adsorption was justified considering electrostatic interactions and π-π interactions between the Cpa-AC and the adsorbate from the solution. |
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