The sorption of organic carbon onto differing clay minerals in the presence and absence of hydrous iron oxide

Saidy, Akhmad Rizalli; Smernik, Ronald J.; Baldock, J. A.; Kaiser, Klaus; Sanderman, Jonathan

doi:10.1016/j.geoderma.2013.05.026

Cited by 135 publications

(87 citation statements)

References 40 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Allophanes are poorly crystalline, have a very high SSA, but a pH-variable charge that only gives a moderate CEC (Churchman and Lowe, 2012). The presence of sesquioxides in the soil clay fractions (SCF) greatly influences the DOC adsorption capacity due to their higher SSA (Wiseman and Püttmann, 2006;Spielvogel et al, 2008;Saidy et al, 2013) and specific chemical interactions (Kleber et al, 2015).…”

Section: Introductionmentioning

confidence: 99%

“…Most of the previous studies were conducted using refined aluminosilicate minerals obtained from geological claydeposits (Guggenberger and Kaiser, 2003;Feng et al, 2005;Rashad et al, 2010;Saidy et al, 2013) while pedogenic soil clays with or without native OC or sesquioxides could behave differently than clay minerals from deposits (Churchman and Lowe, 2012). Soil clay minerals are very different from processed clay minerals from clay-deposits because of their formation in highly heterogeneous and dynamic soil environments (Churchman, 2010;Churchman and Lowe, 2012).…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Adsorption-desorption behavior of dissolved organic carbon by soil clay fractions of varying mineralogy

et al. 2016

View full text Add to dashboard Cite

Soil clay minerals significantly influence the accumulation and stabilization of organic carbon (OC). However, the effect of interactions among phyllosilicate clay minerals, native OC and sesquioxides (Fe/Al oxides) on the adsorption-desorption of dissolved organic carbon (DOC) under different background electrolyte types and concentration is poorly understood. A set of batch adsorption-desorption experiments were conducted using pedogenic clays extracted from soils dominated by kaolinite-illite (Kaol-Ill), smectite (Smec) and allophane (Allo). The clay samples were sequentially treated to remove native OC and sesquioxides, and tested for adsorption-desorption of DOC under various solution conditions. All the experiments were conducted at pH 7 using water extractable fraction of OC from wheat residues. DOC adsorption increased with increasing background electrolyte concentration, and the presence of Ca 2+ significantly enhanced the uptake in comparison to Na + due to a possible cationic bridging effect. Under all electrolyte conditions, the maximum DOC adsorption capacity (Q max ) (mg g −1 ) of the soil clay fractions (SCF) maintained the order: Allo N Smec N Kaol-Ill. A similar order was also observed when the adsorption capacities were normalized to the specific surface area (SSA) of the SCFs (mg m −2 ). DOC adsorption showed a positive relationship with SSA, and sesquioxides and allophanic minerals provided the largest contributions to the SSA in the SCF. Removal of sesquioxides from the SCF resulted in a decrease in SSA and thus DOC adsorption, whereas removal of native OC increased the SSA and subsequent DOC adsorption. Because this study used pedogenic SCFs which represented soils formed in different environments instead of processed clays from geological deposits, it provided realistic information about the interaction of DOC with SCF in relation to their native OC and sesquioxide contents. It also revealed the importance of Ca 2+ in enhancing the carbon adsorption capacities of these SCFs.

show abstract

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Adsorption-desorption behavior of dissolved organic carbon by soil clay fractions of varying mineralogy

et al. 2016

View full text Add to dashboard Cite

show abstract

“…Such data are relevant for two reasons. Firstly hydrous iron oxides are known to affect organics adsorption (Saidy et al, 2013). Secondly, cations released by minor phases will potentially compete with radionuclides, modifying adsorption or complexation.…”

Section: Transport and Behaviour Of Edtamentioning

confidence: 99%

Perturbation induced by EDTA on HDO, Br- and EuIII diffusion in a large-scale clay rock sample

Dagnelie

Arnoux

Radwan

et al. 2015

Applied Clay Science

View full text Add to dashboard Cite

“…The role of iron and aluminum oxides, which are adsorbed onto clay particles, is known to play a part in MUC stabilization [68,[82][83][84][85], although the mechanisms for stabilization have not been determined. Zhang et al [68] also noted that the higher concentration of iron cations in vermiculite facilitated ligand exchange and cation bridging of carboxyl and hydroxyl functional groups, thus improving adsorption capacity.…”

Section: Experimental Studies Of Natural Organic Matter-mineral Strucmentioning

confidence: 99%

Interaction of Natural Organic Matter with Layered Minerals: Recent Developments in Computational Methods at the Nanoscale

2014

View full text Add to dashboard Cite

Abstract:The role of mineral surfaces in the adsorption, transport, formation, and degradation of natural organic matter (NOM) in the biosphere remains an active research area owing to the difficulties in identifying proper working models of both NOM and mineral phases present in the environment. The variety of aqueous chemistries encountered in the subsurface (e.g., oxic vs. anoxic, variable pH) further complicate this field of study. Recently, the advent of nanoscale probes such as X-ray adsorption spectroscopy and surface vibrational spectroscopy applied to study such complicated interfacial systems have enabled new insight into NOM-mineral interfaces. Additionally, due to increasing capabilities in computational chemistry, it is now possible to simulate molecular processes of NOM at multiple scales, from quantum methods for electron transfer to classical methods for folding and adsorption of macroparticles. In this review, we present recent developments in interfacial properties of NOM adsorbed on mineral surfaces from a computational point of view that is informed by recent experiments.

show abstract

The sorption of organic carbon onto differing clay minerals in the presence and absence of hydrous iron oxide

Cited by 135 publications

References 40 publications

Adsorption-desorption behavior of dissolved organic carbon by soil clay fractions of varying mineralogy

Adsorption-desorption behavior of dissolved organic carbon by soil clay fractions of varying mineralogy

Perturbation induced by EDTA on HDO, Br- and EuIII diffusion in a large-scale clay rock sample

Interaction of Natural Organic Matter with Layered Minerals: Recent Developments in Computational Methods at the Nanoscale

Contact Info

Product

Resources

About