1. LIGNIN AMINATION “IN SITU” FOR OBTAINING ECO-FRIENDLY SORBENTS
COST ACTION FP1105 TRABZON 8TH OCTOBER 2013
LIGNIN AMINATION “IN SITU” FOR OBTAINING ECO-FRIENDLY SORBENTS
Anrijs VEROVKINS, Brigita NEIBERTE, Girts ZAKIS, Galia SHULGA
LATVIAN STATE INSTITUTE OF WOOD CHEMISTRY, 27 DZERBENES, RIGA LV1006, LATVIA
Modified bark allows obtaining N containing bark with new practical qualities.
The interaction between lignin and DEEPA (diethylepoxypropylamine) “in situ” may be represented according to the scheme:
Tree species
With all synthesis mixture
Active component DEEPA
Yield of
N-polymer
(%)
N-content in
Pine bark 76
3.04 97
3.84
Grey alder bark 57
1.37 92
2.61

2. Sorption experiments of heavy metals using
grey alder and pine bark aminated with DEEPA
The ability of sorption of pine and grey alder bark modified with DEEPA
heavy metal ions Cr3+, Cu2+, Zn2+, Pb2+ individually (using water solutions of metal salts) and in a mixture Cr3+, Cu2+, Zn2+ has been analyzed and compared to modified wood using atomic absorption spectrophotometer Shimadzu.
The saved submicroscopic structure and the presence of the amino groups were the reason of the good physical and chemical sorption of the modified bark.

3. Sorption experiments of heavy metals using
grey alder and pine bark aminated with DEEPA
Note that not always there is maximal ion concentration in purified objects.
There is also sorption competition between ions, where the determining factors are pH and the presence of other contamination agents.
 In comparison to modified wood, the activity of modified bark is significantly higher for sorption of heavy metals.
 The ability of bark to fix metals is changing in the following order:
Pb2+ > Cu2+ > Zn2+ > Cr3+
 Sorption materials obtained from modified bark of black alder have high sorption activity of Pb2+ and Cu2+.

4. Composites filled with functionalized bark and recycled polypropylene
It is known that a serious problem exists in connection with utilizing heavy metal containing sorbents.
Our investigations shown that the heavy metal containing aminated bark
can be used as a filler in polymer composite materials for improving
their physico-chemical properties.
The necessary experiments to develop the recipe for obtainment of composite materials with high filler concentration have been carried out.