Humic Substances and the Surface Properties of Iron Oxides in Freshwaters

1984 ◽  
pp. 31-46 ◽  
Author(s):  
E. Tipping
Keyword(s):  
Humic Substances ◽  
Iron Oxides ◽  
Surface Properties

Characterization of the surface properties of iron oxides

1985 ◽  
Vol 105 (2) ◽  
pp. 570-576 ◽  
Author(s):  
F.J Micale ◽  
D Kiernan ◽  
A.C Zettlemoyer
Keyword(s):  
Iron Oxides ◽  
Surface Properties

Retention behaviour of humic substances onto mineral surfaces and consequences upon thorium (IV) mobility: case of iron oxides

2002 ◽  
Vol 17 (12) ◽  
pp. 1551-1562 ◽  
Author(s):  
Pascal Reiller ◽  
Valérie Moulin ◽  
Florence Casanova ◽  
Christian Dautel
Keyword(s):  
Humic Substances ◽  
Iron Oxides ◽  
Mineral Surfaces ◽  
Retention Behaviour

Flocculation of Kaolinitic Soil Clays: Effects of Humic Substances and Iron Oxides

1993 ◽  
Vol 57 (5) ◽  
pp. 1277-1283 ◽  
Author(s):  
Ruben Kretzschmar ◽  
Wayne P. Robarge ◽  
Sterling B. Weed
Keyword(s):  
Humic Substances ◽  
Iron Oxides ◽  
Soil Clays

Effect of surface properties on cobalt modification of iron oxides

1992 ◽  
Vol 28 (5) ◽  
pp. 2382-2384 ◽  
Author(s):  
A.V. Blagev ◽  
S.J. Hirz
Keyword(s):  
Iron Oxides ◽  
Surface Properties ◽  
Effect Of Surface

The removal of colloidal lead during estuarine mixing: seasonal variations and importance of iron oxides and humic substances

2011 ◽  
Vol 62 (4) ◽  
pp. 329 ◽  
Author(s):  
Virginie Tanguy ◽  
Matthieu Waeles ◽  
Julien Gigault ◽  
Jean-Yves Cabon ◽  
François Quentel ◽  
...  
Keyword(s):  
Humic Substances ◽  
Iron Oxides ◽  
Seasonal Variations ◽  
Salinity Range ◽  
Mixing Zone ◽  
Size Fractions ◽  
Estuarine Mixing ◽  
Colloidal Lead ◽  
Insight Into ◽  
Organomineral Complexes

In the present study, seven colloidal fractions of lead (Pb) were analysed along the mixing zone of the Penzé estuary over the Year 2009, with the aim to provide some insight into the mechanism that removes the metal from the <0.45-µm fraction. According to our results, Pb was generally found as large colloids (>300 kDa) and was removed in the salinity range 0–10 from all of the size fractions where it was significantly found. Because the colloidal fractionation of Pb was strongly linked to that of iron (Fe) and humic substances (HS), the removal of Pb in the mixing area must occur under flocculation of organomineral complexes. A key period corresponding to the first strong autumnal precipitations was also revealed in the present work. At this time of the year, the mobilisation of Pb (and Fe) from catchment soils is enhanced by the mobilisation of HS and the metal is associated with smaller colloids (30–300 kDa).

scholarly journals Modelling metal–humic substances–surface systems: reasons for success, failure and possible routes for peace of mind

2012 ◽  
Vol 76 (7) ◽  
pp. 2643-2658 ◽  
Author(s):  
P. E. Reiller
Keyword(s):  
Organic Matter ◽  
Humic Substances ◽  
Iron Oxides ◽  
Metal Surface ◽  
Natural Organic Matter ◽  
Organic Material ◽  
Ternary Systems ◽  
Mineral Surfaces ◽  
Satisfactory Description ◽  
Wide Range

AbstractIron oxides and oxyhydroxides are commonly of considerable importance in the sorption of ions onto rocks, soils and sediments. They can be the controlling sorptive phases even if they are present in relatively small quantities. In common with other oxides and clay minerals, the sorption pH-edge of metals is directly linked to their hydrolysis: the higher the residual charge on the metal ion, the lower the pH-edge. Modelling of this process has been successfully carried out using different microscopic or macroscopic definitions of the interface (e.g. surface complexation or ion exchange models that may or may not include mineralogical descriptions). The influence of organic material on the sorption of many metals is of significant. This organic material includes simple organic molecules and more complex exopolymeric substances (e.g. humic substances) produced by the decay of natural organic matter. Sorption of this organic material to mineral surfaces has been the subject of a large body of work. The various types of organic substances do not share the same affinities for mineral surfaces in general, and for iron oxides and oxyhydroxides in particular. In those cases in which successful models of the component binary systems (i.e. metal–surface, metal–organic, organic–surface) have been developed, the formation of mixed surface complexes, the evolution of the surface itself, the addition order in laboratory systems, and the evolution of natural organic matter fractions during sorption, have often precluded a satisfactory description of metal–surface–organic ternary systems over a sufficiently wide range of parameter values (i.e. pH, ionic strength, concentration of humic substances). This manuscript describes the reasons for some successes and failures in the modelling of the ternary systems. Promising recent advances and possible methods of providing more complete descriptions of these intricate systems are also discussed.

The effects of colloidal humic substances on the movement of non-ionic hydrophobic organic contaminants in groundwater

1998 ◽  
Vol 38 (7) ◽  
pp. 159-167 ◽  
Author(s):  
Y. Shimizu ◽  
H. Sogabe ◽  
Y. Terashima
Keyword(s):  
Humic Substances ◽  
Iron Oxides ◽  
Organic Compounds ◽  
Organic Contaminants ◽  
Hydrophobic Organic Compounds ◽  
Hydrophobic Organic Contaminants ◽  
Third Phase ◽  
Aluminosilicate Gel ◽  
Amorphous Aluminosilicate ◽  
Inorganic Constituents

A controlled experimental study of the sorption of colloidal humic substances (humic acid) and a non-ionic hydrophobic organic compound (naphthalene) onto typical inorganic constituents of aquifer solids was performed using four types of model solid phases {i.e., individual model solids (montmorillonite, kaolinite, amorphous aluminosilicate gel, and amorphous iron oxides) and combined model solids (montmorillonite coated by amorphous aluminosilicate gel or iron oxides)}, which are synthesized in the laboratory. The batch experimental results indicated that the sorption of non-ionic hydrophobic organic compounds and colloidal humic substances onto the aquifer solids is significantly influenced by the solid composition. And it was also suggested that the non-ionic hydrophobic organic compounds which have greater hydrophobicity are considered to be sorbed and stabilized by the mobile colloidal humic substances in groundwater, and these colloids may act as a third phase that can increase the amount of compounds that the flow of groundwater can transport. On the other hand, the non-ionic hydrophobic organic contaminants of smaller hydrophobicity may be retarded significantly with the sorption of colloidal humic substances onto the aquifer solids.

A facile, single-step synthesis of flowery shaped, pure/lithium-doped 3D iron oxides

2014 ◽  
Vol 2 (31) ◽  
pp. 12380-12389 ◽  
Author(s):  
Rasmita Barik ◽  
Brajesh Pandey ◽  
Shashi Anand ◽  
Mamata Mohapatra
Keyword(s):  
Iron Oxides ◽  
Surface Properties ◽  
Single Step

The shape-dependent surface properties of iron oxides are being paid increasing attention for their many advanced and synergistic applications.

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