Magnetic iron nanoparticles (Fe3O4) supported on activated carbon as a hybrid adsorbent for desulphurisation of liquid fuels
| Autor: | Prativa Behera, Laxmi Gayatri Sorokhaibam, Mary R. Louis |
|---|---|
| Rok vydání: | 2021 |
| Předmět: |
Materials science
Health Toxicology and Mutagenesis Soil Science Nanoparticle 010501 environmental sciences 01 natural sciences Analytical Chemistry chemistry.chemical_compound Adsorption medicine Environmental Chemistry Waste Management and Disposal 0105 earth and related environmental sciences Water Science and Technology 010401 analytical chemistry Public Health Environmental and Occupational Health equipment and supplies Pollution 0104 chemical sciences chemistry Chemical engineering Dibenzothiophene Surface modification human activities Activated carbon medicine.drug |
| DOI: | 10.6084/m9.figshare.14304133.v1 |
| Popis: | In this work, efficient hybrid adsorbents were developed through surface modification of commercial activated carbon with magnetic iron nanoparticles (Fe3O4). These modified adsorbents were characterised for their texture, morphology, and other surface properties and investigated for sulphur removal from model fuel consisting of thiophene (T), benzothiophene (BT), and dibenzothiophene (DBT) in liquid phase using hexane as a solvent. The effect of temperature and contact time was studied to understand the thermodynamics and kinetics of the adsorption process, and experimental adsorption data were interpreted using standard isotherms such as Langmuir, Freundlich, and Temkin model. The findings showed that the iron-loaded activated carbon could effectively remove the DBT (a representative sulphur compound) much better than the precursor nascent carbons in single and multicomponent models fuels under the optimised dosage of 30 g.L−1 and operating temperature of ~ 40°C. The kinetic analysis revealed that the pseudo-second-order model could represent the surface binding mechanism of DBT. The rate-limiting step, as indicated by the Weber-Morris plot, involved several steps. It was observed that the adsorption potential of the prepared materials increased with the increasing initial DBT concentration, exhibiting a maximum capacity of 29 mg.g−1, and the adsorption process was well described by the Freundlich isotherm (R2 = 0.95 to 0.99). Fe@AC-2 also demonstrated their ability to satisfactorily remove T, BT, and DBT from multi-component model fuel systems with higher selectivity for the more refractory DBT. Thermal regeneration of Fe@AC-2 saturated with DBT at 350°C could be recycled till the fourth cycle, and loss in adsorbent mass was observed in each cycle. Analysis of real diesel fuel pre- and post-adsorption with Fe@AC-2 showed a negligible change in the gross calorific value, density, and kinematic viscosity of the treated diesel from the untreated diesel. |
| Databáze: | OpenAIRE |
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