KOH-super activated carbon from biomass waste: Insights into the paracetamol adsorption mechanism and thermal regeneration cycles
| Autor: | Vitor C. Almeida, Isis P.A.F. Souza, André L. Cazetta, Vitor A. Duarte, Marcela C. Silva, Karen C. Bedin, Rodrigo M. Pontes, Lucas Spessato, Lucas H.S. Crespo |
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| Rok vydání: | 2018 |
| Předmět: |
Environmental Engineering
Potassium Compounds Health Toxicology and Mutagenesis 0211 other engineering and technologies chemistry.chemical_element 02 engineering and technology 010501 environmental sciences 01 natural sciences Oxygen Adsorption Physisorption X-ray photoelectron spectroscopy medicine Hydroxides Environmental Chemistry Biomass Waste Management and Disposal 0105 earth and related environmental sciences Acetaminophen 021110 strategic defence & security studies Aqueous solution Analgesics Non-Narcotic Pollution Nitrogen Carbon Kinetics Chemical engineering chemistry Chemisorption Activated carbon medicine.drug |
| Zdroj: | Journal of hazardous materials. 371 |
| ISSN: | 1873-3336 |
| Popis: | A super activated carbon (SAC) was produced by KOH-activation of a biomass waste for paracetamol (PCT) adsorption from aqueous solution and for adsorption-thermal regeneration cycles. The SAC and the regenerated SAC after five adsorption-regeneration cycles (RSAC-5th) were fully characterized by several techniques. The N2 physisorption showed that the SBET values of the SAC and RSAC-5th are remarkably different, being 2794 m² g−1 and 889 m² g−1, respectively. The XPS analysis demonstrated that the SAC surface is composed by oxygen containing-groups, whilst the RSAC-5th also presents nitrogen ones, provenient from the PCT molecules. The adsorption studies revealed that the maximum adsorption capacity (Qm) for the SAC (356.22 mg g−1) is higher than that for RSAC-5th (113.69 mg g−1). Also, the results demonstrated that the PCT adsorption is governed by both physisorption and chemisorption and the ab initio calculations showed the chemisorption mainly occurs in carboxylic groups. |
| Databáze: | OpenAIRE |
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