Caffeine removal from synthetic wastewater using magnetic fruit peel composites: Material characterization, isotherm and kinetic studies
| Autor: | María Belén Aldás, Victor H. Guerrero, Cristina E. Almeida-Naranjo, Génesis Cabrera |
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| Jazyk: | angličtina |
| Rok vydání: | 2021 |
| Předmět: |
Global and Planetary Change
Langmuir Environmental Engineering Materials science Scanning electron microscope Energy-dispersive X-ray spectroscopy Banana peel Management Monitoring Policy and Law Pollution Emerging contaminant Magnetite Environmental sciences chemistry.chemical_compound Adsorption chemistry Freundlich equation GE1-350 Orange peel Composite material Fourier transform infrared spectroscopy Waste Management and Disposal |
| Zdroj: | Environmental Challenges, Vol 5, Iss, Pp 100343-(2021) |
| ISSN: | 2667-0100 |
| Popis: | This work investigated the adsorption capacity of banana and orange peels, magnetite and their corresponding magnetic composites in the removal of caffeine from synthetic wastewater. The characteristics of the adsorbents were studied using proximal analysis, Fourier transform infrared spectroscopy (FT-IR), Raman spectroscopy, scanning electron microscopy (SEM), energy dispersive spectroscopy (EDS), Brunauer, Emmett and Teller (BET) analysis and X-ray diffraction. Batch adsorption tests were conducted to determine the influence of the adsorbent dose (0.5 and 10.0 g/L), contact time (5 – 180 min) and initial caffeine concentration (10 – 50 mg/L) in the caffeine removal. The fittings of the experimental data to the pseudo first order, pseudo second order, Elovich, and diffusion kinetic models, as well as to the Langmuir, Freundlich and Sips isotherm models were also studied. The use of magnetic peels improved around 1.7 times the adsorption capacity of peels. The effective doses were 3.5 g/L of orange peel, 9.5 g/L of banana peel, 2.5 g/L of orange peel composite, 5.5 g/L of banana peel composite, and 5 g/L of magnetite, achieving caffeine removal efficiencies of 95.5 ± 0.3%, 90.5 ± 0.5%, 93.6 ± 0.2%, 89.2 ± 0.01% and 54.8 ± 0.8%, respectively. The adsorption using the peels, magnetite, and their magnetic composites better fitted the pseudo first order kinetic model and the Langmuir and Sips isotherm models. |
| Databáze: | OpenAIRE |
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