Subcritical water extraction for recovering cellulose fibres from Posidonia oceanica waste
[EN] In this study, cellulose extraction from Posidonia oceanica (PO) waste was studied in order to reduce chemicals in the process, in line with the green chemistry principles. Thus, subcritical water extraction (SWE) was applied to promote the separation of non-cellulosic compounds, such as hemice...
| Autores: | , , , |
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| Tipo de recurso: | artículo |
| Fecha de publicación: | 2024 |
| País: | España |
| Institución: | Universitat Politècnica de València (UPV) |
| Repositorio: | RiuNet. Repositorio Institucional de la Universitat Politécnica de Valéncia |
| Idioma: | inglés |
| OAI Identifier: | oai:riunet.upv.es:10251/214554 |
| Acceso en línea: | https://riunet.upv.es/handle/10251/214554 |
| Access Level: | acceso abierto |
| Palabra clave: | Cellulosic fractions Hydrogen peroxide Sodium chlorite Bleaching step Green extraction TECNOLOGIA DE ALIMENTOS 06.- Garantizar la disponibilidad y la gestión sostenible del agua y el saneamiento para todos 09.- Desarrollar infraestructuras resilientes, promover la industrialización inclusiva y sostenible, y fomentar la innovación 12.- Garantizar las pautas de consumo y de producción sostenibles 15.- Proteger, restaurar y promover la utilización sostenible de los ecosistemas terrestres, gestionar de manera sostenible los bosques, combatir la desertificación y detener y revertir la degradación de la tierra, y frenar la pérdida de diversidad biológica |
| Sumario: | [EN] In this study, cellulose extraction from Posidonia oceanica (PO) waste was studied in order to reduce chemicals in the process, in line with the green chemistry principles. Thus, subcritical water extraction (SWE) was applied to promote the separation of non-cellulosic compounds, such as hemicellulose and lignin, followed by bleaching treatments using hydrogen peroxide, alternatively to the usual sodium chlorite. Two SWE temperatures (150 and 170 °C) were tested, while hydrogen peroxide was used at 4 and 8 % (v/v) at pH 12 in four one-hour bleaching cycles. This treatment was also carried out with sodium chlorite for comparison purposes. SWE efficiently reduced hemicellulose and lignin content in the solid extraction fraction, mainly at 170 °C, which yielded 63 wt.% of solid fraction, with 51 % of cellulose content. This highest temperature also promoted the efficiency of the subsequent bleaching step. Using H2O2 as the bleaching agent, alternatively to chlorine agents, was effective at purifying cellulose but partially altered the cellulose structure through oxidative mechanisms. A combination of SWE at 170 °C and bleaching with H2O2 at 4 or 8 % (v/v) yielded 24 wt.% bleached material from PO waste, with a high cellulose richness (near 90 %). |
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