Transcript LIGNIN AMINATION “IN SITU” FOR OBTAINING ECO

COST ACTION FP1105 TRABZON 8TH OCTOBER 2013
LIGNIN AMINATION “IN SITU” FOR OBTAINING ECOFRIENDLY 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:
B a rk -L ig n in
O H + H 2 C C H C H 2 N(C 2 H 5 ) 2
O C H3
O
B a rk -L ig n in
O -C H 2 -C H O H-C H 2 N(C 2 H 5 ) 2
OC H 3
DEEPA
With all synthesis mixture
Active component DEEPA
Tree species
Yield of
N-polymer
(%)
N-content in
N-polymer
(%)
Yield of
N-polymer
(%)
N-content in
N-polymer
(%)
Pine bark
76
3.04
97
3.84
Grey alder bark
57
1.37
92
2.61
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.
Cr (III)
Zn (II)
Cu (II)
Pb (II)
35
60.0
30
60
56.0
55
25
mg/g,
20
sorbent
15
12.0
10
6.84
5
0.210.60
0.10
3.20
2.35 2.86
5.15
1.36 1.81
1.98
2.11
0
3 Metal
mixture
Grey alder wood
Grey alder bark
3 Metal
mixture
Pine bark
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+.
Cr (III)
Zn (II)
Cu (II)
Pb (II)
35
60.0
30
60
56.0
55
25
mg/g,
20
sorbent
15
12.0
10
6.84
5
0.210.60
0.10
3.20
2.35 2.86
5.15
1.36 1.81
1.98
2.11
0
3 Metal
mixture
Grey alder wood
Grey alder bark
3 Metal
mixture
Pine bark
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.
10
9
6
7.6
4.9 5.0
2
9.2
7.1
6.1 5.9
5.6
5.3 5.1
3
unmodified
modified
modified
+1Me
modified
+3Me
6.5
5.7
6
5.5
4.3
4.1
5.0 5.0
5.0
modified
+3Me
modified
+wood
3.8
4
2
Pine
Grey alder
20
15.0
15
8.7
10.0
18.7 19.5
16.3
16.2
17.1
14.0
11.4
5
0
unmodified
modified
modified
+1Me
modified
+3Me
unmodified
modified
+wood
25
Tensile strength, MPa
Pine
Grey alder
6.5
8
0
0
10
Impact strength, kJ/m
Pine
Grey alder
modified
+wood
Modulus of elasticity in tension, MPa
Elongation at break, %
12
modified
modified
+1Me
2000
1764
Pine
Grey alder
1505
1500
1290
1154
1000
1019
951
790
880
896
982
500
0
unmodified
modified
modified
+1Me
modified
+3Me
modified
+wood