Hydrophilic olive cake extracts: Characterization by physicochemical properties and Cu(II) complexation

Kolokassidou, K.; Szymczak, Wilfried; Wolf, Marco; Obermeier, C.; Buckau, G.; Pashalidis, Ioannis

doi:10.1016/j.jhazmat.2008.08.016

Cited by 13 publications

(6 citation statements)

References 24 publications

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“…The OMSW fulvic fraction composition was similar to others extracted from soils (Schnitzer, 1978); however, the HA had a low oxygen content and significantly higher contents of C, H and N than the soil HAs. This specific composition of HA from OMSW was found also by Plaza et al (2002) and Kolokassidou et al (2008) for HA extracted from pig slurry and olive cake respectively.…”

Section: Yield Elemental Composition and Acid Groups Content Of Omswsupporting

confidence: 68%

“…Humic acid and raw olive cake sorption of Cu and Eu was also tested by Kolokassidou and Pashalidis (2006) and Konstantinou et al (2007). Recently, Kolokassidou et al (2008) studied physicochemical properties and Cu binding behaviour of a hydrophilic fraction isolated from olive cake by alkaline extraction, which may be considered as "humic like fraction". Plaza et al (2005) found significant differences on copper complexation by humic (HA) and fulvic acids (FA) extracted from pig slurry in comparison with HA and FA extracted from amended and not amended soils.…”

Section: Introductionmentioning

confidence: 99%

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Copper binding by olive mill solid waste and its organic matter fractions

Gondar

Bernal

2009

Geoderma

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Section: Yield Elemental Composition and Acid Groups Content Of Omswsupporting

confidence: 68%

Section: Introductionmentioning

confidence: 99%

Copper binding by olive mill solid waste and its organic matter fractions

Gondar

Bernal

2009

Geoderma

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“…HA solutions used in this study were prepared from Aldrich humic acid, purified and characterized as described elsewhere [13].…”

Section: Solid Phase Preparationmentioning

confidence: 99%

The effect of humic acid on the formation and solubility of secondary solid phases (Nd(OH)CO₃and Sm(OH)CO₃)

Antoniou

Pashalidis²,

Geßner

et al. 2011

Radiochimica Acta

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The formation of secondary Ln(III) solid phases (e.g. Nd(OH)CO 3 and Sm(OH)CO 3 ) has been studied as a function of the humic acid (HA) concentration in 0.1 M NaClO 4 aqueous solution and their solubility has been investigated in the neutral pH range (6.5-8) under normal atmospheric conditions. Nd(III) and Sm(III) were selected as analogues for trivalent lanthanide and actinide ions. The solid phases under investigation have been prepared by alkaline precipitation and characterized by TGA, ATR-FTIR, XRD, TRLFS, DR-UV-Vis and Raman spectroscopy, and solubility measurements. The spectroscopic data obtained indicate that Nd(OH)CO 3 and Sm(OH)CO 3 are stable and remain the solubility limiting solid phases even in the presence of increased HA concentration (0.5 g/L) in solution. Upon base addition in the Ln(III)-HA system decomplexation of the previously formed Ln(III)-humate complexes and precipitation of two distinct phases occurs, the inorganic (Ln(OH)CO 3 ) and the organic phase (HA), which is adsorbed on the particle surface of the former. Nevertheless, HA affects the particle size of the solid phases. Increasing HA concentration results in decreasing crystallite size of the Nd(OH)CO 3 and increasing crystallite size of the Sm(OH)CO 3 solid phase, and affects inversely the solubility of the solid phases. However, this impact on the solid phase properties is expected to be of minor relevance regarding the chemical behavior and migration of trivalent lanthanides and actinides in the geosphere.

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“…This affinity is similar to the )) as a function of log[Eu 3+ ]. Experimental data were obtained from potentiometric measurements in aqueous solutions containing 0.1 g L −1 olive-cake carbon loaded with Cu(II) ions at different Eu(III) ion concentration, 0.1 M NaClO 4 as background electrolyte and carried out at 25 ± 3 • C under normal atmospheric conditions corresponding affinities of olive cake and humic acid, indicating that similar active sites are responsible for the metal ion binding on the olive-cake carbon surface (Kolokassidou and Pashalidis 2006;Kolokassidou et al 2009;Konstantinou et al 2007Konstantinou et al , 2009). The relatively increased surface area (135 cm 2 g −1 ) and adsorption capacity of the olive cake carbon for Eu(III) ions (37 mg g −1 ), which is close to the corresponding value given in literature (Gad and Awwad 2007), suggests that olive cake carbon can be considered as a potential adsorbent for Cu(II)-and Eu(III)-ions in water treatment technologies.…”

Section: Presents the Experimental Data In A Log([(≡s-o-) 2 Cu]/[(≡s-mentioning

confidence: 99%

“…From the experimental point of view the interaction of Cu(II) ions with mineral surfaces (Konstantinou and Pashalidis 2008) and natural organic matter (Kolokassidou and Pashalidis 2006;Konstantinou et al 2007Konstantinou et al , 2009Kolokassidou et al 2009) is successfully investigated by means of potentiometry using a Cu(II) ion selective electrode. On the other hand europium is used as a non-radioactive analogue for trivalent actinides, because trivalent actinides and lanthanides present similar chemical behaviour in solid and aqueous phase, which is attributed to the fact that the f-elements have almost identical ionic radii (Seaborg 1993).…”

mentioning

confidence: 99%

Competitive sorption of Cu(II) and Eu(III) ions on olive-cake carbon in aqueous solutions—a potentiometric study

Konstantinou

Pashalidis

2010

Adsorption

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The competitive sorption of Cu(II) and Eu(III) ions from aqueous solutions by olive-cake carbon, has been investigated by potentiometry at pH 6, I = 0.1 M NaClO 4 , 25°C and under normal atmospheric conditions. Evaluation of the experimental data supports the formation of inner-sphere surface complexes and results in the calculation of the formation constant of the surface complexes ((=S-O) 2 Cu), which is found to amount log β Cu = 5.3 ± 0.3. Addition of competing Eu(III) ions in the aqueous system leads to replacement of the Cu(II) by the competitor metal ion. Evaluation of the potentiometric data obtained from competition experiments indicates an ion-exchange mechanism. The formation constant of the Eu(III) species sorbed on olive cake carbon is found to be log β Eu = 5.1 ± 0.5. Comparison of the complex formation constants of the olive-cake carbon with the corresponding complex formation constants for of olive cake and humic acid with the two metal ions, indicates that the same type of active sites is responsible for the metal ion complexation on the surface of the different types natural organic matter (e.g. olive-cake carbon, olive-cake and humic acid).

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Hydrophilic olive cake extracts: Characterization by physicochemical properties and Cu(II) complexation

Cited by 13 publications

References 24 publications

Copper binding by olive mill solid waste and its organic matter fractions

Copper binding by olive mill solid waste and its organic matter fractions

The effect of humic acid on the formation and solubility of secondary solid phases (Nd(OH)CO₃and Sm(OH)CO₃)

Competitive sorption of Cu(II) and Eu(III) ions on olive-cake carbon in aqueous solutions—a potentiometric study

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Hydrophilic olive cake extracts: Characterization by physicochemical properties and Cu(II) complexation

Cited by 13 publications

References 24 publications

Copper binding by olive mill solid waste and its organic matter fractions

Copper binding by olive mill solid waste and its organic matter fractions

The effect of humic acid on the formation and solubility of secondary solid phases (Nd(OH)CO3and Sm(OH)CO3)

Competitive sorption of Cu(II) and Eu(III) ions on olive-cake carbon in aqueous solutions—a potentiometric study

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The effect of humic acid on the formation and solubility of secondary solid phases (Nd(OH)CO₃and Sm(OH)CO₃)