Percorrer por autor "Mattos, Kim Nicolas"
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- Valorization of biomass waste for the removal of fluoxetine from aqueous matricesPublication . Mattos, Kim Nicolas; Queiroz, A.M.; Ribeiro, António E.; Brito, Paulo; Lima, Vanderlei Aparecido deThis research examines the use of olive pit waste to remove fluoxetine, a pharmaceutical drug classified as an emerging pollutant. It is an constituent that threatens the environment due to its bioaccumulation. Conventional wastewater treatment plants cannot remove it completely. The activated charcoal used was previously recovered from olive pits and chemically activated with NaOH. Kinetic tests showed that as temperature increased, the amount of removal from the material increased as well, reaching up to 98.87% at 45 degrees Celsius. Overall the pseudo second-order kinetic model fit the experimental data the best with a χ2 value equal to 0.003725 at 45 degrees Celsius. The Freundlich model fit the equilibrium study better than the Langmuir model, indicating that adsorbing compounds are done so on heterogeneous surfaces and continue through multiple layers. The maximum capacity of adsorption from Langmuir’s model was identified to be 17.07 mg g-1 with regards to olive pit adsorbent. For thermodynamic analysis, the activation energy was found to be 42.32 kJ mol-1, and the Gibbs free energy indicated a value of -0.851 kJ mol-1 supporting the conclusion that the adsorption process is both spontaneous and favourable thermodynamically. Based on these results, it can be concluded that activated carbon from olive pits is a sustainable and effective alternative for treating water with pharmaceutical micropollutants.