Use of Chènevotte, a valuable co-product of industrial hemp fiber, as adsorbent for pollutant removal. Part I : chemical, microscopic, spectroscopic and thermogravimetric characterization of raw and modified samples

Chiara Mongiovi (1) , Dario Lacalamita (1) , Nadia Morin-Crini (1) , Xavier Gabrion (2) , Aleksandra Ivanovska (3) , Federico Sala (4) , Vincent Placet (2) , Vito Rizzi (4) , Jennifer Gubisota (4) , Ernesto Mesto (4) , Ana Ritta Lado Ribeiro (5) , Paola Fini (4) , Nicoletta de Vietro (4) , Emanuela Schingaro (4) , Mirjana Kostic (3) , Cesare Cosentino (4) , Pinalysa Cosma (4) , Corina Bradu (4) , Gilles Chanet (4) , Grégorio Crini (1)

1 LCE - Laboratoire Chrono-environnement (UMR 6249)
2 FEMTO-ST - Franche-Comté Électronique Mécanique, Thermique et Optique - Sciences et Technologies (UMR 6174)
3 University of Belgrade [Belgrade]
4 Istituto di Chimica e Biochimica G. Ronzoni
5 Universidade do Porto = University of Porto

FINEAU (2021–2024) is a trans-disciplinary research project involving French, Serbian, Italian, Portuguese and Romanian colleagues, a French agricultural cooperative and two surface treatment industries, intending to propose chènevotte, a co-product of the hemp industry, as an adsorbent for the removal of pollutants from polycontaminated wastewater. The first objective of FINEAU was to prepare and characterize chènevotte-based materials. In this study, the impact of water washing and treatments (KOH, Na2CO3 and H3PO4) on the composition and structure of chènevotte (also called hemp shives) was evaluated using chemical analysis, X-ray diffraction (XRD) analysis, scanning electron microscopy (SEM), energy-dispersive X-ray (EDX) spectroscopy, X-ray computed nanotomography (nano-CT), attenuated total reflectance–Fourier transform infrared (ATR-FTIR) spectroscopy, solid state NMR spectroscopy and thermogravimetric analysis. The results showed that all these techniques are complementary and useful to characterize the structure and morphology of the samples. Before any chemical treatment, the presence of impurities with a compact unfibrillated structure on the surfaces of chènevotte samples was found. Data indicated an increase in the crystallinity index and significant changes in the chemical composition of each sample after treatment as well as in surface morphology and roughness. The most significant changes were observed in alkaline-treated samples, especially those treated with KOH.

Mots clés: characterization; chènevotte; hemp shives; surface analysis

Domaines: Mécanique [physics]

Chiara Mongiovi, Dario Lacalamita, Nadia Morin-Crini, Xavier Gabrion, Aleksandra Ivanovska, et al.. Use of Chènevotte, a valuable co-product of industrial hemp fiber, as adsorbent for pollutant removal. Part I : chemical, microscopic, spectroscopic and thermogravimetric characterization of raw and modified samples. Molecules, 2021, 26 (15), pp.4574. ⟨10.3390/molecules26154574⟩. ⟨hal-03427028⟩