Kaolinite properties, structure and influence of metal retention on pH

Miranda-Trevino, Jorge C.; Coles, Cynthia A.

doi:10.1016/s0169-1317(03)00095-4

Cited by 273 publications

(111 citation statements)

References 16 publications

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“…The mineralogy of the clay materials is also known to influence their water retention properties. The dominance of low activity clay mineral (kaolinite) is known to promote a face-to-face arrangement of the kaolinite plates, minimizing shrinkage and swelling (Miranda-Trevino and Coles, 2003). However, the possible presence of hydroxyl-interlayered vermiculite (HIV) as wedges between the kaolinite plates (Pai et al, 2004) may expand the available adsorption sites between the mineral layers, thereby enhancing water retention (Ajayi et al, 2013).…”

Section: Discussionmentioning

confidence: 99%

Comparing the potentials of clay and biochar in improving water retention and mechanical resilience of sandy soil

Ajayi¹,

Horn²

2016

International Agrophysics

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A b s t r a c t. Changing climate is threatening rainfall regularity particularly in the semi-arid and arid regions; therefore, strategies to conserve water within their coarse-grained soils and to improve water use efficiency of crops are critical. This study compared the effectiveness of biochar and two types of clay materials in augmenting water retention and improving mechanical resilience of fine sand. The amendment of fine sand with woodchip-biochar and kaolinite (non-swelling clay) and Na-bentonite (swelling clay) improved the water retention capacity and interparticle bonding of the substrate depending of the rate of amendment and water content of the substrates. Na-bentonite was more effective at increasing water retention capacity at more negative matric potentials. Biochar was more effective at saturation due to the increased porosity, while kaolinite responds similarly to biochar. It is, however, shown that most of the water retained by the Na-betonite may not be available to plants, particularly at high amendment rate. Furthermore, the clay and biochar materials improved particle bonding in the fine sand with the Na-bentonite being more effective than biochar and kaolinite (in that order) in strengthening interparticle bonds and improving the resilience of fine sand, if the rate of amendment is kept at ≤50 g kg -1 .

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Section: Discussionmentioning

confidence: 99%

Comparing the potentials of clay and biochar in improving water retention and mechanical resilience of sandy soil

Ajayi¹,

Horn²

2016

International Agrophysics

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“…Besides, since the surface characteristics and mineral structure were recognized to have a great impact on the retention of heavy metals [13][14][15], physical and chemical properties of the modified goethite surface were systematically characterized in order to better understand the relationship between metal adsorption performance and the adsorbent surface characteristics.…”

Section: Introductionmentioning

confidence: 99%

Surface modification of goethite by phosphate for enhancement of Cu and Cd adsorption

Zhang

Shan

2007

Colloids and Surfaces A: Physicochemical and Engineering Aspect

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“…Kaolin used in the present work, is made of clayey minerals dominated by the kaolinite, derived essentially from the alteration of Felds path alkaline and micas with a density of 2.62. Previous research has shown that the kaolin structure possesses great advantages in many processes due to its high chemical stability and low expansion coefficient [7,8]. The importance of kaolin is remarkable as one of the most abundant mineral in soils and sediments, its properties are such that it interacts with other soil elements and contribute to the mechanical stability of the soils [9,10].…”

Section: Methodsmentioning

confidence: 99%

Compressibility of a Fat Clay mixed with aggregates

Bouteraa¹,

Rouili²

2016

J Civil Environ Eng

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Abstract'Fat' clayey soils, containing large proportion of fines (more than 50%) and mixture of aggregates are usually encountered as natural deposits in a high plasticity state. These soils may be used as row material after chemical or mechanical stabilization, in many earthworks applications. The clay content, the amount and size of aggregates, are known to affect the compressibility potential, and thus, the stiffness of the soil when subjected to vertical loads. In this investigation, a comprehensive oedometer testing program was conducted on reconstituted artificial samples, made of various mass proportions of kaolin, sand and gravel. The moisture content of the samples varied accordingly to the percentage of kaolin content in each series, but yielding samples of high plasticity, having the same Atterberg limits. The compressibility was characterized herein by the coefficient of volume compressibility (m v ). The results indicate that, for this type of soils, the compressibility is much more affected by the coarser matrix (ratio of the mass percentage of the gravel to the mass percentage of sand G/S) rather than the percentage of clay content. Based on the observations made, a chart is proposed for a quick estimation of the compressibility potential of fat clays.

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Kaolinite properties, structure and influence of metal retention on pH

Cited by 273 publications

References 16 publications

Comparing the potentials of clay and biochar in improving water retention and mechanical resilience of sandy soil

Comparing the potentials of clay and biochar in improving water retention and mechanical resilience of sandy soil

Surface modification of goethite by phosphate for enhancement of Cu and Cd adsorption

Compressibility of a Fat Clay mixed with aggregates

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