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19. Structural, Thermal, Rheological and Mechanical Properties of Polypropylene/Graphene Nanoplatelets Composites: Effect of Particle Size and Melt Mixing Conditions

Author

Beuguel, Quentin, Mija, Alice, Vergnes, Bruno, and Peuvrel-Disdier, Edith

Subjects
Polymer rheology -- Observations, Polymer composites -- Mechanical properties -- Thermal properties -- Chemical properties, Graphene -- Mechanical properties -- Chemical properties -- Thermal properties, Polypropylene -- Mechanical properties -- Chemical properties -- Thermal properties, Propylene, X-ray diffraction, Microscopy, Engineering and manufacturing industries, Science and technology
Abstract

Graphene nanoplatelets (GNP) of various sizes were mixed with polypropylene (PP) in an internal mixer to prepare composites. The effects of mixing conditions, GNP size and concentration in composites were investigated. The composites were characterized at different scales, using electron microscopy, X-ray diffraction, thermogravimetric analysis, and rheometry. It was shown that the PP/ GNP composites had to be considered as non-intercalated and non-exfoliated microcomposites. However, the thermal, rheological and mechanical properties of the PP/GNP microcomposites were improved with respect to that of the matrix and similar to those of thermoplastic/organoclay or reduced graphene nanocomposites. In the best cases, storage modulus plateau in the glassy domain was increased by 30% and onset of degradation temperature by 40[degrees]C. Finally, in the investigated range of this study, the mixing conditions applied in the internal mixer did not affect the structural and rheological properties of the PP/GNP composites., INTRODUCTIONNonpolar polypropylene (PP) is largely used for its low cost and its easy processability. For several decades, attention has been paid to improve PP properties by adding nanofillers. Montmorillonite was [...]

Published
2018
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32. A Humins-Derived Magnetic Biochar for Water Purification by Adsorption and Magnetic Separation

Author

Lomenech, C., Hurel, Ch., Messina, L., Schembri, M., Tosi, P., Orange, F., Georgi, F., Mija, Alice, Kuzhir, P., Hurel, Ch, Institut de Chimie de Nice (ICN), Université Nice Sophia Antipolis (... - 2019) (UNS), and COMUE Université Côte d'Azur (2015-2019) (COMUE UCA)-COMUE Université Côte d'Azur (2015-2019) (COMUE UCA)-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS)-Université Côte d'Azur (UCA)

Subjects
0106 biological sciences, Langmuir, Environmental Engineering, humins, 020209 energy, Magnetic separation, Iron oxide, Maghemite, 02 engineering and technology, engineering.material, 01 natural sciences, chemistry.chemical_compound, Adsorption, 010608 biotechnology, Biochar, water decontamination, 0202 electrical engineering, electronic engineering, information engineering, [CHIM]Chemical Sciences, Freundlich equation, magnetic separation, Waste Management and Disposal, ComputingMilieux_MISCELLANEOUS, magnetic biochar, Renewable Energy, Sustainability and the Environment, industrial by-product valorisation, Chemical engineering, chemistry, 13. Climate action, engineering, Superparamagnetism
Abstract

In this study, the use of magnetic biochar particles recovered from biorefinery by-products (humins) for adsorption of hydrophilic organic pollutants was investigated. The biochar was prepared by thermal treatment of crude humins followed by a grinding step after which a magnetic iron oxide was co-precipitated on the biochar surface. The resulting iron oxide content of the biochar composite was found to be 9% by volume, and the presence of a characteristic Fe–O vibrational band was observed by FTIR-ATR. XPS analysis of Fe2p spectrum enabled the nature of iron oxide to be identified as maghemite. Finally, magnetometry measurements demonstrated the superparamagnetic properties of maghemite. The adsorption of methylene blue on the biochar composite was found to be fast (less than 1 h at pH 6 with an initial concentration of methylene blue of 2 × 10–5 mol L−1). Kinetics data were satisfactorily modelled by both first and second order models. Freundlich and Langmuir models were applied to adsorption isotherms data. Maximum adsorption capacity (3.35 × 10–5 mol g−1), and Langmuir and Freundlich constants (2.33 × 104 L mol−1 and 5.70 × 10–5 mol0.913 L0.087 g−1 respectively) were found to be comparable to the average of those found in the literature. Electrostatic attraction between oppositely charged methylene blue and magnetic biochar was presumed to be the dominant interaction governing adsorption at environmental pH values. Lastly, a laboratory-scale experimental device with magnetic filtration under flow allowed the complete separation of the magnetic biochar composite from the liquid phase. This study shows that this magnetic biochar composite is a promising and economically interesting recovery route for biorefinery by-products and could be used for adsorption purposes.

Published
2021

33. Humins as promising material for producing sustainable carbohydrate-derived building materials

Author

Mija, Alice, van der Waal, Jan C., Pin, Jean-Mathieu, Guigo, Nathanael, and de Jong, Ed

Subjects
Polysaccharides -- Analysis, Building materials -- Properties, Business, Construction and materials industries
Abstract

ABSTRACT Nowadays biobased building materials are used in various fields and for a wide range of applications such as polymers, fillers, coatings, adhesives, impregnation materials or high performance composites. This [...]

Published
2017
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41. FROM BIOREFINERY BY-PRODUCT TO BIORESINS. THERMOSETS BASED ON HUMINS AND EPOXIDIZED LINSEED OIL

Author

Mija, Alice, Licsandru, Erol, Institut de Chimie de Nice (ICN), Université Nice Sophia Antipolis (... - 2019) (UNS), and COMUE Université Côte d'Azur (2015-2019) (COMUE UCA)-COMUE Université Côte d'Azur (2015-2019) (COMUE UCA)-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS)-Université Côte d'Azur (UCA)

Subjects
food.ingredient, Chemistry, Organic Chemistry, Thermosetting polymer, 02 engineering and technology, 010402 general chemistry, 021001 nanoscience & nanotechnology, Biorefinery, Pulp and paper industry, 01 natural sciences, 0104 chemical sciences, food, Linseed oil, Materials Chemistry, By-product, Humin, [CHIM]Chemical Sciences, 0210 nano-technology, ComputingMilieux_MISCELLANEOUS
Abstract

International audience

Published
2019

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