Surface properties and phosphate adsorption of binary systems containing goethite and kaolinite

Wei, Shaozhong; Tan, Wenfeng; Fan, Louzhen; Zhao, Wei; Weng, Liping

doi:10.1016/j.geoderma.2013.09.001

Cited by 80 publications

(42 citation statements)

References 40 publications

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“…Two KGAs were prepared in this study, which were characterized by about 10% (KGA-10%) and 4% (KGA-4%) of goethite in the KGAs (equal to 6.3% and 2.5% Fe in KGAs), and represented the Fe-rich soils and Fe-poor soils, respectively. KGAs were prepared according to the method described by Wei et al (2014). Briefly, 200/ 100 mL oxygen-free DW was added to 48.5/20.5 g kaolinite in a 1 L polyethylene flask, followed by vigorous stirring and ultrasonic dispersion.…”

Section: Materials Preparationmentioning

confidence: 99%

“…In natural aqueous environments such as aquatic-terrestrial transition zones, hydrous oxides and clay minerals usually coexist and are associated with each other (Wei et al, 2014). The fate of GO in these systems will be not only affected by pH and IS, but also influenced by its interaction with hydrous oxides and clay minerals.…”

Section: Conclusion and Environmental Implicationsmentioning

confidence: 99%

“…However, in natural environments, goethite and kaolinite more often associate with each other rather than in discrete, separate form, and the physicochemical properties such as specific surface area and cation exchange capacity of this association are different from that of their individual minerals (Wei et al, 2012(Wei et al, , 2014. Therefore, goethite and kaolinite were chosen as the representative hydrous oxides and clay minerals respectively, and the kaoliniteegoethite association (KGA) was prepared and used in this study.…”

Section: Introductionmentioning

confidence: 99%

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Effect of co-existing kaolinite and goethite on the aggregation of graphene oxide in the aquatic environment

et al. 2016

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Broad applications of graphene oxide (GO) will result in the release of GO into aquatic environments, where clay minerals and metal (hydr)oxides are commonly present. Thereby the interactions between GO and a binary system containing clay minerals and metal (hydr)oxides can occur. We investigated the aggregation of GO with kaolinite and kaolinite-goethite associations (KGAs) in aquatic systems under different pHs, ionic strengths, and GO concentrations. GO suspension was unstable at low pHs, and the aggregation of GO occurred in the presence of KGA-4% and KGA-10% until pH 5 and 6, respectively. Kaolinite decreased the critical coagulation concentration (CCC) of GO at pH 5.5 from around 50 to 20 mM NaCl due to the reduced energy barrier. Heteroaggregation of GO with KGAs was extremely sensitive to ionic strength at pH 5.5, and the CCC of GO in the presence of KGA-10% increased from less than 1 mM NaCl to 5 mM NaCl with the increase of pH from 5.5 to 9. The heteroaggregation extent of GO with KGAs was enhanced firstly, then reduced with the increase of GO concentrations at pH 5.0, which is likely because KGA plates were more efficiently wrapped by large-size GO sheets with increasing GO concentrations. These findings are useful for understanding and predicting the fate of GO in the relatively complicated aquatic and soil environments where binary minerals co-exist.

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Section: Materials Preparationmentioning

confidence: 99%

Section: Conclusion and Environmental Implicationsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Effect of co-existing kaolinite and goethite on the aggregation of graphene oxide in the aquatic environment

et al. 2016

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“…The particles smaller than 0.002 mm were quartz (61 %), kaolinite (34.4 %) and goethite (< 4.6 %) in the soil. The point of zero charge of quartz is about pH 0.5-3.5 (Iler 1979), that of kaolinite is about pH 4.1 (Wei et al 2014), and that of goethite is about pH 8.2 (Wei et al 2014), according to the literature. They and the organic materials have variable charges and the positive charge decreases or the negative charge increases with the increase of pH.…”

Section: Inspection With Zeta Potential and Soil Chargementioning

confidence: 88%

Influence of phosphate sorption on dispersion of a Ferralsol

Pham

Ishiguro

Tran

et al. 2014

Soil Science and Plant Nutrition

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Soil dispersion induces soil erosion and colloidal leaching. Nutrients are lost at the same time and this causes water contamination. Phosphate is an essential element for living organisms. Because phosphate influences soil dispersion and it is an important limited resource, this influence must be evaluated well in order to diminish negative effects on soil structure. In this paper, we firstly evaluated the influence of phosphate sorption on soil dispersion by calculating repulsive potential energy between soil particles. Ferralsol, which is a typical soil in rainy tropical regions, was used as the material. The dispersion-flocculation phenomena were investigated with absorbance of soil suspension under different pH, phosphate adsorption and electrolyte concentration in an Na-NO 3 -PO 4 system. The repulsive potential energy was calculated based on the diffuse double layer theory and the measured zeta potential. We indicated that the measured absorbance increased with the increase of the repulsive potential energy. The repulsive potential energy increased with increasing phosphate sorption up to about 5 to 20 mmol kg −1 at all pH, and it induced the soil dispersion, because phosphate sorption increased the negative charge of the soil. After its peak, it decreased with increasing phosphate sorption because the electrolyte concentration increased and the electrolyte screened the electric field near the soil surface. The repulsive potential energy also increased with increasing pH because of the increase of the negative charge of the soil. Even at low pH, after a certain amount of phosphate sorption, the soil dispersed due to the increase of repulsive potential energy, although the soil flocculated before phosphate application. Because the soil dispersion causes soil and phosphorus loss, the influence of soil pH and phosphate sorption on the soil dispersion should be considered for good soil management.

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“…This clay mineral is a typical 1:1-type phyllosilicate with the chemical composition Al 2 Si 2 O 5 (OH) 4 . Its surface comprises aluminol groups (≡Al-OH) situated at the edges and the hydroxyl-terminated planes of the clay lamellae (Wei et al 2014). On its basal surface there are permanent negative charges that are responsible for sorption of cations , (Tombácz et al 2004) and silanol (≡SiOH) linked to the aluminol groups through hydrogen atom (Rehim et al 2010).…”

Section: Introductionmentioning

confidence: 99%

Physical and chemical study of lattice kaolinites and their interaction with orthophosphate

Silva

Lages

Santana

2017

An. Acad. Bras. Ciênc.

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This study covers the evaluation of the structure and the capacity in adsorbing orthophosphate ions of kaolinites collected from sampling sites in Manaus (Brazil). The kaolinites were obtained using physical fractioning (sieving/siphoning) techniques and chemical treatment with HCl, H 2 SO 4 , H 2 O 2 and KCl. The investigation of the kaolinite lattices involved the Hinckley and Plançon indexes determined from X-ray diffraction data, Fourier transformed infrared spectroscopy, scanning electron microscopy and Mössbauer spectroscopy. The absorption capacity of orthophosphate ions was calculated by Freundlich and Langergren isotherms. A transitional state was observed in the crystallographic structure from kaolinites because of the isomorphic substitution of Al 3+ by Fe 3+. This isomorphic substitution occurs accompanied by the optical pleochroism behavior, but it also reduces the mean particle sizes and increases the number of structural defects and magnetic properties of these kaolinites. Mössbauer spectroscopy showed that the substituting Fe 3+ preferentially occupies octahedral sites. In the kaolinite lattices there are different octahedral sites of

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Surface properties and phosphate adsorption of binary systems containing goethite and kaolinite

Cited by 80 publications

References 40 publications

Effect of co-existing kaolinite and goethite on the aggregation of graphene oxide in the aquatic environment

Effect of co-existing kaolinite and goethite on the aggregation of graphene oxide in the aquatic environment

Influence of phosphate sorption on dispersion of a Ferralsol

Physical and chemical study of lattice kaolinites and their interaction with orthophosphate

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