Assisted hydrothermal carbonization of agroindustrial byproducts as effective step in the production of activated carbon catalysts for wet peroxide oxidation of micro-pollutants
| Autor: | Giane Gonçalves Lenzi, Juliana Martins Teixeira de Abreu Pietrobelli, Jose L. Diaz de Tuesta, B.K. Massalimova, Marcus C. Saviotti, Gabriel F. Pantuzza, Assem Shinibekova, Fernanda F. Roman, M. S. Kalmakhanova, Helder Gomes, Hiram J.F. Sartori |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2021 |
| Předmět: |
chemistry.chemical_element
02 engineering and technology Hydrothermal carbonization 010501 environmental sciences 01 natural sciences Peroxide Catalysis chemistry.chemical_compound Wet peroxide oxidation Caffeine medicine Chemical Engineering (miscellaneous) Waste Management and Disposal 0105 earth and related environmental sciences Activated carbons Process Chemistry and Technology 021001 nanoscience & nanotechnology Pollution Micro-pollutants chemistry Chemical engineering Valorisation 0210 nano-technology Bagasse Pyrolysis Carbon Activated carbon medicine.drug |
| Zdroj: | Repositório Científico de Acesso Aberto de Portugal Repositório Científico de Acesso Aberto de Portugal (RCAAP) instacron:RCAAP |
| Popis: | This work deals with the valorisation of bagasse of sugarcane – BC, bagasse of malt – BM and seed of chia – SC, through its transformation into pyrochars, hydrochars and activated carbons (ACs) by pyrolysis, hydrothermal carbonization (HTC) and sequential HTC and pyrolysis, respectively. The HTC process was carried out in the presence of H2O, FeCl3 and H2SO4 solutions. The materials resulting by HTC in the presence of FeCl3 revealed the highest burn-off, but the contents of carbon released into the liquid phase, measured as total organic carbon, and to the gaseous phase, determined by carbon balance, depend strongly on the carbon precursor. In this sense, BC generates more volatile organic compounds (up to 34% of the initial carbon content), followed by BM (< 15%) and SC (< 5%) in their HTC and pyrolysis (70%). The pyrochars, hydrochars and ACs prepared from BC also show the highest specific surface areas (SBET < 447 m2⋅g-1) when compared to the specific surface areas of the materials prepared from BM and SC. The carbon-based materials prepared with FeCl3 show the highest catalytic activity, but iron leaching into solution is observed. On the other hand, the materials prepared with H2SO4 show high activity, enabling its application in successive cycles and the complete degradation of caffeine in concentrations ranging from 1 to 100 mg⋅L-1, after 5–60 min of reaction. The authors are grateful to the Foundation for Science and Technology (FCT, Portugal) and FEDER (Fundo Europeu de Desenvolvimento Regional) under Programme PT2020 for financial support to CIMO (UIDB/00690/2020). Fernanda Fontana Roman also thanks to the FCT for the individual research grant SFRH/BD/143224/2019. info:eu-repo/semantics/publishedVersion |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|