Abstract
Humic acid-like substance (HA-like substance) extracted from maize plant residue at an yield of 81.1 ± 4.9 g kg-1 of dry matter (dm) was tested for surfactant properties and ability to solubilise tetrachloroethene (PCE). Critical micelle concentration (CMC) of HA-like substance was detected to be 1986 mg L-1. Both, HA-like substance composition and average molecular weight [MW] affected CMC and a multiple linear regression model was proposed: CMC = 12 246 - 56.19 alkyl-C - 0.532 MW (R2 = 0.90; P <0.01, n = 7) where CMC was given in mg L-1, alkyl-C was the percentage of total C, and MW was given in Da. Maize-HA-like substance solubilised PCE at the rate of 0.05 g of PCE for each gram of maize-HA-like substance, which was 3.6-9.6 times lower than the data obtained in our earlier work using HA extracted from organic wastes, but was higher than that obtained with commercial HA from leonardite. Taking into consideration the two-site model of solubilisation of PCE in surfactant (i.e., solute partitioning into the micellar hydrophobic core and dissolution and/or binding into the hydrophilic non-ionic shell) and macromolecular composition of HA-like substance, the non-ionic hydrophile-alkyl lipophile balance was expected to control PCE solubilisation as the good multiple linear regression indicated: log Kdom = -1.37 + 0.062 alkyl-C +0.055 O-alkyl-C (R2 = 0.93, P <0.05, n = 6), where log Kdom represents the micelle-water partitioning of PCE (mL g-1) and alkyl-C and O-alkyl-C represent the content of these two kinds of C detected by CP MAS 13C NMR (as % of the total C).
| Original language | English |
|---|---|
| Pages (from-to) | 1017-1022 |
| Number of pages | 6 |
| Journal | Chemosphere |
| Volume | 78 |
| Issue number | 8 |
| DOIs | |
| Publication status | Published - Feb 2010 |
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Keywords
- Biosurfactant
- Critical micelle concentration
- Humic acid-like substance
- Maize plant residues
- Tetrachloroethene
ASJC Scopus subject areas
- Environmental Chemistry
- Chemistry(all)
Cite this
Surfactant properties and tetrachloroethene (PCE) solubilisation ability of humic acid-like substances extracted from maize plant and from organic wastes : A comparative study. / Adani, Fabrizio; Tambone, Fulvia; Davoli, Enrico; Scaglia, Barbara.
In: Chemosphere, Vol. 78, No. 8, 02.2010, p. 1017-1022.Research output: Contribution to journal › Article
}
TY - JOUR
T1 - Surfactant properties and tetrachloroethene (PCE) solubilisation ability of humic acid-like substances extracted from maize plant and from organic wastes
T2 - A comparative study
AU - Adani, Fabrizio
AU - Tambone, Fulvia
AU - Davoli, Enrico
AU - Scaglia, Barbara
PY - 2010/2
Y1 - 2010/2
N2 - Humic acid-like substance (HA-like substance) extracted from maize plant residue at an yield of 81.1 ± 4.9 g kg-1 of dry matter (dm) was tested for surfactant properties and ability to solubilise tetrachloroethene (PCE). Critical micelle concentration (CMC) of HA-like substance was detected to be 1986 mg L-1. Both, HA-like substance composition and average molecular weight [MW] affected CMC and a multiple linear regression model was proposed: CMC = 12 246 - 56.19 alkyl-C - 0.532 MW (R2 = 0.90; P <0.01, n = 7) where CMC was given in mg L-1, alkyl-C was the percentage of total C, and MW was given in Da. Maize-HA-like substance solubilised PCE at the rate of 0.05 g of PCE for each gram of maize-HA-like substance, which was 3.6-9.6 times lower than the data obtained in our earlier work using HA extracted from organic wastes, but was higher than that obtained with commercial HA from leonardite. Taking into consideration the two-site model of solubilisation of PCE in surfactant (i.e., solute partitioning into the micellar hydrophobic core and dissolution and/or binding into the hydrophilic non-ionic shell) and macromolecular composition of HA-like substance, the non-ionic hydrophile-alkyl lipophile balance was expected to control PCE solubilisation as the good multiple linear regression indicated: log Kdom = -1.37 + 0.062 alkyl-C +0.055 O-alkyl-C (R2 = 0.93, P <0.05, n = 6), where log Kdom represents the micelle-water partitioning of PCE (mL g-1) and alkyl-C and O-alkyl-C represent the content of these two kinds of C detected by CP MAS 13C NMR (as % of the total C).
AB - Humic acid-like substance (HA-like substance) extracted from maize plant residue at an yield of 81.1 ± 4.9 g kg-1 of dry matter (dm) was tested for surfactant properties and ability to solubilise tetrachloroethene (PCE). Critical micelle concentration (CMC) of HA-like substance was detected to be 1986 mg L-1. Both, HA-like substance composition and average molecular weight [MW] affected CMC and a multiple linear regression model was proposed: CMC = 12 246 - 56.19 alkyl-C - 0.532 MW (R2 = 0.90; P <0.01, n = 7) where CMC was given in mg L-1, alkyl-C was the percentage of total C, and MW was given in Da. Maize-HA-like substance solubilised PCE at the rate of 0.05 g of PCE for each gram of maize-HA-like substance, which was 3.6-9.6 times lower than the data obtained in our earlier work using HA extracted from organic wastes, but was higher than that obtained with commercial HA from leonardite. Taking into consideration the two-site model of solubilisation of PCE in surfactant (i.e., solute partitioning into the micellar hydrophobic core and dissolution and/or binding into the hydrophilic non-ionic shell) and macromolecular composition of HA-like substance, the non-ionic hydrophile-alkyl lipophile balance was expected to control PCE solubilisation as the good multiple linear regression indicated: log Kdom = -1.37 + 0.062 alkyl-C +0.055 O-alkyl-C (R2 = 0.93, P <0.05, n = 6), where log Kdom represents the micelle-water partitioning of PCE (mL g-1) and alkyl-C and O-alkyl-C represent the content of these two kinds of C detected by CP MAS 13C NMR (as % of the total C).
KW - Biosurfactant
KW - Critical micelle concentration
KW - Humic acid-like substance
KW - Maize plant residues
KW - Tetrachloroethene
UR - http://www.scopus.com/inward/record.url?scp=75149163556&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=75149163556&partnerID=8YFLogxK
U2 - 10.1016/j.chemosphere.2009.11.039
DO - 10.1016/j.chemosphere.2009.11.039
M3 - Article
C2 - 20044126
AN - SCOPUS:75149163556
VL - 78
SP - 1017
EP - 1022
JO - Chemosphere
JF - Chemosphere
SN - 0045-6535
IS - 8
ER -