Characterization and Performance of Peanut Shells in Caffeine and Triclosan Removal in Batch and Fixed-Bed Column Tests

• DOI: 10.3390/molecules29122923
• Publication Date: 2024-06-19T15:47:17Z
• Authors: Cristina E. Almei...; Mayra Frutos; Victor H. Guerrero; Cristina Villamar...
• Keywords: Characterization

Peanut shells’ adsorption performance in caffeine and triclosan removal was studied. shells were analyzed for their chemical composition, morphology, surface functional groups. Batch fixed-bed column experiments carried out with solutions containing 30 mg/L of triclosan. The parameters examined included peanut shell particle size (120–150, 300–600, 800–2000 µm), adsorbent dose (0.02–60 g/L), contact time (up to 180 min), bed height (4–8 cm), hydraulic loading rate (2.0 4.0 m3/m2-day). After determining the optimal conditions, kinetics, isotherm, breakthrough curve models applied analyze experimental data. showed an irregular consisted mainly polysaccharides (around 70% lignin, cellulose, hemicellulose), a specific area 1.7 m2/g pore volume 0.005 cm3/g. highest efficiencies (85.6 ± 1.4%) (89.3 1.5%) achieved using smallest particles 10.0 0.1 g/L doses over 45 min, respectively. Triclosan easier compared due its higher lipophilic character. pseudo-second-order kinetics model provided best fit data, suggesting chemisorption process between caffeine/triclosan adsorbent. Equilibrium data well-described by Sips model, maximum capacities 3.3 mg/g 289.3 triclosan, In tests, significantly influenced efficiency behavior, 120–150 µm exhibiting capacity (0.72 mg/g) (143.44 mg/g), albeit clogging issues. also good agreement Bohart–Adams, Thomas, Yoon–Nelson models. Therefore, findings this study highlight not only effective capability remove but versatility as promising option water treatment sanitation applications different contexts.