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

Publication Type Full-text conference paper published in other conference proceedings
Funding for basic activity Unknown
Defending: ,
Publication language English (en)
Title in original language Preparation and Sorption Properties of Si-Containing Composite Materials Based on Hydrolysis Lignin
Field of research 1. Natural sciences
Sub-field of research 1.4 Chemical sciences
Authors Tatjana Dižbite
Anna Andersone
Valentīns Solodovņiks
Aleksandrs Volperts
Lilija Jašina
Gaļina Teliševa
Dmitry Evtuguin
Keywords Hydrolysis lignin, non-hydrolyzed residues, bioethanol, enzymatic hydrolysis, sol-gel process, silica
Abstract 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.
Reference 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. In: 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, Italy, Varenna, 1-4 September, 2009. Varenna: Exorma, Editors: M. Orlandi, C. Crestini, 2009, pp.189-192.
ID 5960