Inhibition of acidification of kaolinite and an Alfisol by aluminum oxides through electrical double‐layer interaction and coating

Li, J. Y.; Xu, Ren-kou

doi:10.1111/ejss.12021

Cited by 15 publications

(6 citation statements)

References 39 publications

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“…Another potential factor is the presence of SRO and free Al and Fe inorganic species in the B but not the E horizons (Table ). In the illuvial horizons, some of these reactive mineral phases could mask potential cation exchange sites through diffuse double layer overlapping and coating of phyllosilicates (Hendershot & Lavkulich, ; Oades, ; Li & Xu, ). In the E horizon, reactive Al and Fe minerals were not present in significant amounts and we can surmise that phyllosilicates retained their negative surface charge.…”

Section: Discussionmentioning

confidence: 99%

Potential influence of poorly crystalline minerals on soil chemistry inPodzols of southwesternCanada

Grand

Lavkulich

2013

European J Soil Science

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Concepts of soil chemistry were established, in the main, for agricultural soils with a fine texture and nearneutral pH. These concepts often need to be modified when considering acidic forest soils. For example, studies conducted in northeastern US forests challenged the idea of a universal positive relationship between base saturation (Bsat), effective cation exchange capacity (CEC e ) and pH. The objective of this study was to measure soil chemistry variables in Podzols of southwestern Canada and determine their interrelationships as well as the potential influence of surface-active iron (Fe) and aluminium (Al) species. We measured exchangeable cation concentration in each pedogenic horizon and investigated their relation to pH, soil organic carbon, silt and clay and pyrophosphate-extractable, oxalate-extractable and dithionite-extractable Al and Fe. We found that the chemistry of the forest floor was different from that of the mineral soil because of the limited extent of mixing between the two layers. In the forest floor, biological cycling maintained a large Bsat and large calcium saturation but a low pH. In the subsoil, pH had a positive correlation with Bsat but a negative correlation with CEC e . The formation of organo-mineral complexes between soil organic matter and short-range order Al and Fe phases could explain the anomalous relationship between pH and CEC e . This study provides new insight into mechanisms controlling forest soil chemical properties and should hence contribute to our ability to manage forests for long-term productivity. RésuméLes concepts de la chimie du sol ontété développés pour la plupart dans des sols agricoles de texture fine et pH proche de la neutralité. Ces concepts doivent souventêtre modifiés lorsque les sols forestiers acides sont considérés. Par exemple, desétudes conduites dans les forêts du nord-est des Etats-Unis ont remis en question le caractère universel de la corrélation positive entre le taux de saturation (Bsat), la capacité d'échange cationique effective (CECe) et le pH. L'objectif de ce travailétait de mesurer les paramètres courants de la chimie du sol dans des podzols du sud-ouest canadien afin d'établir leur interrelation ainsi que l'influence potentielle des espèces minérales réactives de fer (Fe) et d'aluminium (Al). A ces fins, nous avons mesuré la concentration de cationséchangeables dans chaque horizon pédogénétique et avonsétudié sa relation avec le pH, le carbone organique du sol, les limons et argiles, et le Fe et Al extraits par le pyrophosphate, l'oxalate et le citrate-bicarbonate-dithionite. Les résultats montrent que la composition chimique de l'horizon organique est très différente par rapport au sol minéral. Ceci s'explique par le faible taux de transfert entre les deux couches. Dans l'horizon organique, le phénomène de recyclage biologique maintient une forte Bsat et forte saturation en calcium, mais un pH faible. Dans les horizons du sous-sol, le pH est corrélé de manière positive avec la Bsat mais de manière négative avec la CECe. La form...

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Section: Discussionmentioning

confidence: 99%

Potential influence of poorly crystalline minerals on soil chemistry inPodzols of southwesternCanada

Grand

Lavkulich

2013

European J Soil Science

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“…Maiti et al [ 31 ] reported laterite pH values in the range of 7.0–7.2. Similarly, Li and Xu [ 68 ] found the pH of kaolinite in the acidic (5.3) range, which was slightly lower than the pH of the kaolinite used in this study. Moreover, most samples had pH values in the acidic range.…”

Section: Resultsmentioning

confidence: 48%

Natural Clay Minerals as Potential Arsenic Sorbents from Contaminated Groundwater: Equilibrium and Kinetic Studies

Rehman

Rukh

Ayoubi

et al. 2022

IJERPH

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Arsenic (As) contaminated groundwater is a worldwide concern due to its chronic effects on human health. The objectives of the study were to evaluate natural inexpensive raw laterite (RL) and kaolinite (RK) for their potential use as As sorbents and to understand the As sorption on laterite and kaolinite by employing sorption and kinetic models. Raw laterite and RK were tested for EC, pH, XRF and CEC as basic parameters. Batch sorption and kinetic experiments data were fitted in the sorption (Langmuir and Freundlich) model and kinetic (pseudo-first and pseudo-second order) reaction equations, respectively. Morphological and structural changes were observed in RL and RK samples before and after As saturation by employing FTIR and SEM. The major constituent in RL was Fe and Al oxides while in RK major oxides were silica and Al. The Freundlich sorption model well explained the experimental data, indicating a greater sorption capacity of RL on a hetero-layered surface compared to RK. The kinetic reaction equations showed that equilibrium was achieved after a contact time of 240 min and the adsorption was chemisorption in nature. The RL and RK were found to be effective sorbents for As removal, however, RL showed maximum As adsorption and thus superior in comparison with RK. Structural and morphological characterization reveals the role of Fe and Al oxides in the case of RL, and Al oxides in the case of RK, in the adsorption of As. Hence this study concludes that these naturally occurring inexpensive resources can be used as sorbent agents for As-contaminated drinking water treatment.

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“…Hence, kaolinite has low CEC, and it is hard to swell or shrink, depending on the wetness or dryness of the soil (nonexpanding clay). In addition, the low negative charge density of kaolinite results in the leaching of base cations from soil [45].…”

Section: Kaolinitic Soilsmentioning

confidence: 99%

Co-Application of Charcoal and Wood Ash to Improve Potassium Availability in Tropical Mineral Acid Soils

et al. 2021

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Potassium (K) is a macronutrient required by plants for energy production, enzyme activation, formation of cell wall, production of protein, and photosynthesis. However, K in the soil solution is leached from the rhizosphere before it interacts with soil colloids because of the abundance of kaolinite clay minerals in mineral acid soils such as Ultisols and Oxisols. These soils are highly weathered, low in organic matter, low in pH, but high aluminium (Al), and iron (Fe) ions. As a result, K becomes unavailable for plants, and this affects crop production and farmers’ profitability. This problem has steered the attention to the application of amendments to minimise K loss. Animal manures, plant residues, and composts applications are some of the corrective measures taken to improve the K availability in tropical acid soils. However, there is dearth of information on co-application of charcoal and wood ash as soil amendments to improve the K availability and the changes they cause to the dynamic equilibrium of K in mineral acid soils. Hence, this review discusses the dynamics, availability of K, and proposed mechanisms involved when charcoal and wood ash are used to amend tropical acid soils. The optimisation and understanding of the role of charcoal and wood ash co-application as soil amendments have potential benefits to improve the K availability and physicochemical properties of mineral acid soils.

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Inhibition of acidification of kaolinite and an Alfisol by aluminum oxides through electrical double‐layer interaction and coating

Cited by 15 publications

References 39 publications

Potential influence of poorly crystalline minerals on soil chemistry inPodzols of southwesternCanada

Potential influence of poorly crystalline minerals on soil chemistry inPodzols of southwesternCanada

Natural Clay Minerals as Potential Arsenic Sorbents from Contaminated Groundwater: Equilibrium and Kinetic Studies

Co-Application of Charcoal and Wood Ash to Improve Potassium Availability in Tropical Mineral Acid Soils

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