| Popis: |
In the present study, biomass from the Chromolaena odorata plant's stem was activated using sulfuric acid to absorb crystal violet (CV) dye. The adsorption operation of CV dye was studied considering the effect of variables like pH, initial dye concentration, time, adsorbent dosage, and temperature. The pseudo-second-order equation best fitted the kinetic study, and thermodynamic parameters calculated were activation energy (9.56 kJ/mol), change in Gibbs energy (81.43 to 96.7 kJ/mol), enthalpy change (6.89 kJ/mol), and entropy change [-254.4 J/ (mol K)]. Response surface methodology (RSM) estimated at pH (4.902), adsorbent dosage (8.33 g/L), dye concentration (82.30 ppm), temperature (300.13 K) dye removal of 97.53% is possible. FTIR, SEM, XRD, BJH, and BET confirmed adsorption operation. The adsorbent can be reused for 5 cycles effectively. Langmuir isotherm best fitted the adsorption operation was used for designing a theoretical single-stage batch adsorber for large-scale operation. |
