Removal of naphthenic acids using activated charcoal: Kinetic and equilibrium studies

Abstract

This study proposes the use of activated charcoal made from Umba uba wood as an adsorbent for the removal of naphthenic acid in an aviation kerosene model mixture. The activated charcoal was characterised as mesoporous with a carbon graphite profile and presented pH pzc equal to 10.5. The best working conditions were obtained for activated charcoal levels of <0.09 mm and 300 r min À1. The system reached the equilibrium after 360 min, without significant statistical difference for the pseudo-first-and pseudo-second-order kinetic models. The Weber-Morris and Boyd models corroborated the conclusion that adsorption is not controlled only by the intraparticle diffusion step. For the equilibrium study, the adsorptive capacity obtained was of 1.1 g g À1 , with the Brunauer-Emmett-Teller model better correlating with the experimental data. Given the results obtained, the activated charcoal demonstrated to have a remarkable potential for removing naphthenic acid in an aviation kerosene model mixture.

Adsorption for copper(II) ion with chitosan-SP/PET composite adsorbent enhanced by electric field

“…The form of pseudo-second-order model equation is formulated as Campos et al. (2018) where q e and q t (mg g −1 ) represent the adsorption capacity of Cu(II) at equilibrium and operating time t (h), respectively.…”

Novel Application of Tagua Shell (Phytelephas aequatorialis) as Adsorbent Material for the Removal of Pb(II) Ions: Kinetics, Equilibrium, and Thermodynamics of the Process

“…The point of zero charge (pHpzc) of TSH was determined by analyzing the variation in pH (2-11) of 25 mL of distilled water in contact with 0.1 g of adsorbent for 24 h at 300 rpm [13]. The pH was quantified using a Benchtop Fisher Scientific accumet AB150 pH meter.…”

Identification and Characterization of Peruvian Native Bacterial Strains as Bioremediation of Hg-Polluted Water and Soils Due to Artisanal and Small-Scale Gold Mining in the Secocha Annex, Arequipa

“…At this point, the Hg removal capacity becomes slow but constant and remains so until the 1080 h. This trend is due to the fact that, at the beginning of the test, the bacterial strain has a large number of unsaturated sites available for adsorption, which decrease over time. Furthermore, the repulsive forces of adsorbed Hg molecules could inhibit adsorption at other sites [78]. This type of prolonged removal would be very useful in the bioremediation of contaminated soils because it would ensure the efficiency of the treatment by being active for long periods of time.…”