Preparation and characterisation of hydrated silica/lignin biocomposites
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Poznan University of Technology
Teofil Jesionowski   

Poznan University of Technology, Institute of Chemical Technology and Engineering, M. Sklodowskiej–Curie 2, PL-60965 Poznan, Poland
Publication date: 2012-06-01
Physicochem. Probl. Miner. Process. 2012;48(2):463–473
Silica/lignin biocomposites were obtained by a new method proposed and fully characterised. Silica was precipitated from aqueous solution of sodium silicate (as an SiO2 precursor) and sulphuric acid (as a precipitating agent). The support obtained was subjected to surface functionalisation with aminosilane and then modified with Kraft lignin preliminary activated with sodium periodate solution. The products were characterised by elemental (N, C, H, S) and colorimetric analyses. Adsorption properties of the products were evaluated on the basis of determination of specific surface area, pore volume and pore diameter. The influence of the amount of lignin incorporated into the silica matrix on the physicochemical properties of the biocomposites was proved to be significant. The materials obtained can be used as selective adsorbents of heavy metals or pro-ecological polymer fillers.