Lignin – cross-linked natural phenolic polymer – based on its chemical structure could have a wide range of applications. It has a high reactivity due to its aromatic nature and presence of various functional groups, and thus, can be used as high performance adsorbent. However, its sorption capacity and sorption rate need to be further enhanced for industrial applications. In general, chemical modification, including crosslinking and functionalization, are necessary to impart sufficient adsorption properties. Another approach is the combination of biomacromolecules and inorganic carriers to form organic-inorganic hybrid materials. In that case, properties of inorganic sorbents can be upgraded by the valuable characteristics of the organic polymer.<br/>Hybrid materials based on lignin and silica in different mass ratios were prepared by several synthetic approaches: electrostatic attraction of modified lignin to aminosilica surface, sol-gel method, crosslinking of functional groups of lignin and inorganic carrier with different agents.<br/>The peculiarities of different approaches to synthesis of lignin/silica hybrid materials were studied and the influence of synthetic conditions on physicochemical properties of obtained composites were investigated by infrared spectroscopy, thermogravimetric analysis, nitrogen adsorption/desorption, and scanning electron microscopy.<br/>It was found that changing the pH of system, variations with inorganic filler (carrier) mass content, type of crosslinking agent applied, time of preparation are greatly affected by physicochemical characteristics of obtained materials, such as specific surface area, porosity, morphology, and thermal stability.<br/>Synthesized hybrid composites were found to be effective as sorbents for the removal of heavy metal ions and synthetic dyes from aqueous solutions. Thus, obtained lignin-based composites are prospective materials for water remediation processes as well as metals recovering from aqueous solutions.

Sustainable added-value lignin materials for specific molecules separation

Macromolecular Chemistry: The Second Century

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ACS Spring 2020 National Meeting & Expo

The official archive and repository for all ACS Meetings & Expositions abstracts and select posters or presentations.