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Start Over Descriptor "Pyrolysi" Publisher american chemical society
2 results on '"Pyrolysi"'

1. Chitosan-Derived Iron Oxide Systems for Magnetically Guided and Efficient Water Purification Processes from Polycyclic Aromatic Hydrocarbons

Author

Giuliana Magnacca, Roberto Nisticò, Maria Eugenia Parolo, Flavia Franzoso, Domenica Scarano, Federico Cesano, Luciano Carlos, Nistico', R, Franzoso, F, Cesano, F, Scarano, D, Magnacca, G, Parolo, M, and Carlos, L

Subjects
Materials science, CHIM/03 - CHIMICA GENERALE ED INORGANICA, iron oxides, Scanning electron microscope, Coprecipitation, General Chemical Engineering, carbon coating, chitosan, iron oxides, magnetic materials, PAH adsorption, pyrolysis, PAH adsorption, Analytical chemistry, Maghemite, Carbon coating, 02 engineering and technology, MAGNETIC MATERIALS, 010501 environmental sciences, engineering.material, 01 natural sciences, Nanomaterials, Magnetization, Iron oxide, Environmental Chemistry, High-resolution transmission electron microscopy, Magnetic material, IRON OXIDES, CHITOSAN, 0105 earth and related environmental sciences, Chitosan, Renewable Energy, Sustainability and the Environment, PYROLYSIS, Otras Ciencias Químicas, Ciencias Químicas, General Chemistry, Pyrolysi, 021001 nanoscience & nanotechnology, pyrolysis, PAH ADSORPTION, CARBON COATING, 6. Clean water, Chemical engineering, 13. Climate action, engineering, Magnetic nanoparticles, Iron oxides, Magnetic materials, Pyrolysis, magnetic materials, Magnetic force microscope, 0210 nano-technology, CIENCIAS NATURALES Y EXACTAS
Abstract

Chitosan and pyrolyzed chitosan, acting as protective frameworks of magnetic nanoparticles (magnetite/maghemite and/or metallic Fe), have been investigated to be used in magnetically guided water remediation processes from polycyclic aromatic hydrocarbons (PAHs). Chitosan-derived magnet-sensitive materials were first obtained by a one-step coprecipitation method, and then two carbon-derived magnetic chitosan materials were obtained under N2 gas flow at 550 and 800 °C, respectively. The obtained materials were investigated by means of X-ray diffraction (XRD), FTIR spectroscopy, scanning electron microscopy (SEM), high resolution transmission electron microscopy (HRTEM), atomic force microscopy (AFM), magnetic force microscopy (MFM), and magnetization measurements. Thermal treatment conditions, along with the amounts of chitosan used in the synthesis processes, played a critical role in the crystal structure and magnetic properties of the obtained nanomaterials. The adsorption capacity of chitosan-derived magnet-sensitive materials was tested toward PAHs. The results indicate high sorption capacity for anthracene and naphthalene onto the chitosan-derived material pyrolyzed at 550 °C. Furthermore, experiments performed with a mixture of eight PAHs show that PAH molecules with higher hydrophobicity and more extended aromaticity had stronger sorption capacity. Interestingly, due to the obtained results, the use of chitosan is encouraged as a platform for the creation of green adsorbents for further developments in wastewater purification treatments. Fil: Nisticò, Roberto. Università di Torino; Italia Fil: Franzoso, Flavia. Università di Torino; Italia Fil: Cesano, Federico. Università di Torino; Italia Fil: Scarano Domenica. Università di Torino; Italia Fil: Magnacca, Giuliana. Università di Torino; Italia Fil: Parolo, Maria Eugenia. Universidad Nacional del Comahue; Argentina Fil: Carlos, Luciano. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Patagonia Norte. Instituto de Investigación y Desarrollo en Ingeniería de Procesos, Biotecnología y Energías Alternativas. Universidad Nacional del Comahue. Instituto de Investigación y Desarrollo en Ingeniería de Procesos, Biotecnología y Energías Alternativas; Argentina

Published
2017
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2. Chitosan-derived iron oxide systems for magnetically guided and efficient water purification processes from polycyclic aromatic hydrocarbons

Author

Nistico', R, Franzoso, F, Cesano, F, Scarano, D, Magnacca, G, Parolo, M, Carlos, L, Cesano, Fo, Parolo, ME., Nistico', R, Franzoso, F, Cesano, F, Scarano, D, Magnacca, G, Parolo, M, Carlos, L, Cesano, Fo, and Parolo, ME.

Abstract

Chitosan and pyrolyzed chitosan, acting as protective frameworks of magnetic nanoparticles (magnetite/maghemite and/or metallic Fe), have been investigated to be used in magnetically guided water remediation processes from polycyclic aromatic hydrocarbons (PAHs). Chitosan-derived magnet-sensitive materials were first obtained by a one-step coprecipitation method, and then two carbon-derived magnetic chitosan materials were obtained under N2 gas flow at 550 and 800 °C, respectively. The obtained materials were investigated by means of X-ray diffraction (XRD), FTIR spectroscopy, scanning electron microscopy (SEM), high resolution transmission electron microscopy (HRTEM), atomic force microscopy (AFM), magnetic force microscopy (MFM), and magnetization measurements. Thermal treatment conditions, along with the amounts of chitosan used in the synthesis processes, played a critical role in the crystal structure and magnetic properties of the obtained nanomaterials. The adsorption capacity of chitosan-derived magnet-sensitive materials was tested toward PAHs. The results indicate high sorption capacity for anthracene and naphthalene onto the chitosan-derived material pyrolyzed at 550 °C. Furthermore, experiments performed with a mixture of eight PAHs show that PAH molecules with higher hydrophobicity and more extended aromaticity had stronger sorption capacity. Interestingly, due to the obtained results, the use of chitosan is encouraged as a platform for the creation of green adsorbents for further developments in wastewater purification treatments.

Published
2017

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