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Publikācija: Preparation and Sorption Properties of Si-Containing Composite Materials Based on Hydrolysis Lignin

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Nosaukums oriģinālvalodā Preparation and Sorption Properties of Si-Containing Composite Materials Based on Hydrolysis Lignin
Pētniecības nozare 1. Dabaszinātnes
Pētniecības apakšnozare 1.4. Ķīmija
Autori Tatjana Dižbite
Anna Andersone
Valentīns Solodovņiks
Aleksandrs Volperts
Lilija Jašina
Gaļina Teliševa
Dmitry Evtuguin
Atslēgas vārdi Hydrolysis lignin, non-hydrolyzed residues, bioethanol, enzymatic hydrolysis, sol-gel process, silica
Anotācija In order to improve sorption properties of hydrolysis lignin - reach-in-lignin non-hydrolyzed residue after fuel ethanol production by enzymatic hydrolysis of softwood, mechano-chemical modification and sol-gel process were carried out, using a Si-containing oligomers as modifiers. For both modification methods 29Si NMR spectroscopy data show that the Si-component of composites forms condensed silica network with condensation degree of about 80%, which contains rather significant amount of Si-OH groups important for adsorption interactions with metal ions. The composites obtained via sol-gel process differ by enhanced hydrophobicity and more developed porosity than those obtained by mechano-chemical process and the parent lignin. Adsorption efficiency towards heavy metals, e.g. Cd2+, achieved in the case of diluted solutions practically 100%, whereas for the parent lignin this value was about 40%. In comparison with the parent lignin, Cd2+ and Mn2+ adsorption capacity were increased in 1.5-2 times, but Cu2+ in 3-6 times. Process of heavy metals adsorption depends on the mode of lignin modification and follows the Langmuir model and the Freundlich model, respectively, for composites obtained by the sol-gel process and the mechano-chemical treatment.
Atsauce Dižbite, T., Andersone, A., Solodovņiks, V., Volperts, A., Jašina, L., Teliševa, G., Evtuguin, D. Preparation and Sorption Properties of Si-Containing Composite Materials Based on Hydrolysis Lignin. No: Proceeding Book: Italic 5, Science and Techonolgy of Biomass. Advances and Challenges. From Forest and Agricultural Biomassses to High Added Value Products: Processes and Materials, Itālija, Varenna, 1.-4. septembris, 2009. Varenna: Exorma, Editors: M. Orlandi, C. Crestini, 2009, 189.-192.lpp.
ID 5960