Revealing the adsorption mechanism of copper on hemp-based materials through EDX, nano-CT, XPS, FTIR, Raman, and XANES characterization techniques
C. Mongiovı̀,Grégorio Crini,Xavier Gabrion,Vincent Placet,Virginie Blondeau-Patissier,A. Krystianiak,Sylvie Durand,Johnny Beaugrand,A. Dorlando,Camille Rivard,Landrot Gautier,Ana Rita Lado Ribeiro,Dario Lacalamita,Bernard Martel,Jean-Noel Staelens,Aleksandra Ivanovska,Mirjana Kostic,Olivier Heintz,Corina Bradu,Marina Raschetti,Nadia Morin-Crini +20 more
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TLDR
In this article , the adsorption mechanism of materials prepared from hemp shives as co-products of the hemp industry, namely, sodium carbonate-activated (SHI-C) and polycarboxylic agent-grafted (ShI-BTCA), was revealed by different microscopic and spectroscopic techniques.Abstract:
Hemp-based materials have been recently proposed as adsorbents for metals present in aqueous solutions using adsorption-oriented processes. This study aims to reveal the adsorption mechanism of materials prepared from hemp shives as co-products of the hemp industry, namely sodium carbonate-activated (SHI-C) and polycarboxylic agent-grafted (SHI-BTCA) hemp shives. The interactions between copper and two hemp-based materials were characterized by different microscopic and spectroscopic techniques such as energy-disperse X-ray (EDX) spectroscopy, computed nano-tomography (nano-CT), X-ray photoelectron spectroscopy (XPS), Fourier-transform infrared (FTIR) spectroscopy, Raman spectroscopy, and X-ray absorption near-edge structure (XANES) spectroscopy. The results showed remarkable different mechanisms for copper adsorption onto the SHI-C and SHI-BTCA hemp shives. Namely, copper surface adsorption and diffusion in the structure of the SHI-C material were predominant, whereas the adsorption of copper onto SHI-BTCA was due to a chemisorption phenomenon and ion-exchange involving the adsorbent carboxylate groups. The combination of the abovementioned complementary microscopic and spectroscopic techniques allowed us to characterize and distinguish the type of interactions involved in the liquid-solid adsorption phenomena. read more
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