Clay Mineral Nanotubes: Stability, Structure and Properties

Duarte, Hélio A.; Lourenço, Maicon Pierre; Heine, Thomas; Guimarães, Luciana

doi:10.5772/34459

Cited by 6 publications

(6 citation statements)

References 87 publications

(140 reference statements)

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“…The minerals’ point of zero charge (PZC) influences their adsorption behavior as net positive charge occurs only at pH < PZC, favoring anion adsorption. The isoelectric point of halloysite is around pH 3 (Duarte et al., 2012), and the PZC can vary between 4.9 and 5.9 (Gray‐Wannell et al., 2020). Theng et al.…”

Section: Discussionmentioning

confidence: 99%

“…The minerals' point of zero charge (PZC) influences their adsorption behavior as net positive charge occurs only at pH < PZC, favoring anion adsorption. The isoelectric point of halloysite is around pH 3 (Duarte et al, 2012), and the PZC can vary between 4.9 and 5.9 (Gray-Wannell et al, 2020). Theng et al (1982) found that halloysite developed only little positive charge at low pH and no positive charge above pH 7, which was reflected by negative zeta potentials (Table 2).…”

Section: Glyphosate Adsorptionmentioning

confidence: 99%

“…The basal oxygen atoms of the tetrahedral Si sheet form the outer surface (“siloxane surface”), whereas the inner surface is terminated by doubly coordinated hydroxyl groups of the octahedral Al sheet. Singly coordinated aluminol and silanol groups at the edges of the tubes are considered the main reactive sites (Duarte et al., 2012). The outer siloxane surface is negatively charged, whereas the inner aluminol surface is positively charged at pH < 8.5 (Lvov et al., 2008).…”

Section: Introductionmentioning

confidence: 99%

“…The outer siloxane surface is negatively charged, whereas the inner aluminol surface is positively charged at pH < 8.5 (Lvov et al., 2008). Depending on their size, chemicals are bound within the tube, a property used for binding of pesticides (Duarte et al., 2012; Zhong et al., 2017).…”

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Glyphosate adsorption on synthetic allophanes and halloysite: Effects of pH and mineral properties

Remlinger,

Lenhardt,

Rechberger

et al. 2023

J. Plant Nutr. Soil Sci.

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BackgroundGlyphosate (GLP) is a widely used herbicide with possible adverse effects on human health and the environment. In soils, GLP strongly adsorbs on clay‐sized minerals, depending on pH, the amount of organic carbon, as well as the contents and properties of Al and Fe oxyhydroxides and clay minerals. Many clay‐sized minerals have already been investigated regarding GLP adsorption behavior, but information on minerals commonly found in volcanic soils is still lacking.AimThe aim of this study was to investigate for the first time the pH‐dependent adsorption of GLP on allophane and halloysite, typical minerals found in volcanic soils.MethodsGLP adsorption was studied in batch experiments at three pH values (5, 6, and 7). Synthetic allophanes with two different initial Al:Si ratios (1.4 and 1.8) and a halloysite were used as adsorbents.ResultsThe adsorption capacity (AC) increased with rising Al:Si ratio and decreasing pH. The AC of allophane was significantly higher than that of halloysite. GLP adsorption on allophane was larger than that reported for other clay minerals and Al and Fe oxyhydroxides, especially at low pH. The AC of halloysite was higher than reported for most other clay minerals.ConclusionDifferent mineral formation pathways in volcanic soils, notably the formation of halloysite versus allophanes, strongly affect the soils’ retention capacity for GLP. The high AC of allophanes may induce the low mobility of GLP in allophane‐containing soils. Long‐term use of GLP may accumulate the herbicide in these soils with potential effects on biodiversity and ecosystem services.

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Section: Discussionmentioning

confidence: 99%

Section: Glyphosate Adsorptionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Glyphosate adsorption on synthetic allophanes and halloysite: Effects of pH and mineral properties

Remlinger,

Lenhardt,

Rechberger

et al. 2023

J. Plant Nutr. Soil Sci.

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“…In contrast, in octahedral sheets, the cation is situated at the center, coordinating with six anions (e.g., F, Cl, O, and OH) and sharing six corners with the neighboring octahedron (Figure 6b). A common plane (Figure 6c) was formed by the tetrahedra, with the free corners pointing to the same side of the sheet [97].…”

Section: Porous Phyllosilicate Nanocatalystsmentioning

confidence: 99%

Recent Developments on the Catalytic and Biosensing Applications of Porous Nanomaterials

Pal¹,

Chakraborty

Cho

et al. 2023

Nanomaterials

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Nanoscopic materials have demonstrated a versatile role in almost every emerging field of research. Nanomaterials have come to be one of the most important fields of advanced research today due to its controllable particle size in the nanoscale range, capacity to adopt diverse forms and morphologies, high surface area, and involvement of transition and non-transition metals. With the introduction of porosity, nanomaterials have become a more promising candidate than their bulk counterparts in catalysis, biomedicine, drug delivery, and other areas. This review intends to compile a self-contained set of papers related to new synthesis methods and versatile applications of porous nanomaterials that can give a realistic picture of current state-of-the-art research, especially for catalysis and sensor area. Especially, we cover various surface functionalization strategies by improving accessibility and mass transfer limitation of catalytic applications for wide variety of materials, including organic and inorganic materials (metals/metal oxides) with covalent porous organic (COFs) and inorganic (silica/carbon) frameworks, constituting solid backgrounds on porous materials.

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Polymeric smart coatings containing modified capped halloysite nanotubes for corrosion protection of carbon steel

et al. 2023

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A newly designed smart self-healing epoxy coating system comprised of modified halloysite nanotubes (HNTs) having capping is proposed for corrosion protection of steel. In the first step, HNTs were loaded with 8-hydroxyquinoline (8HQ), used as a corrosion inhibitor. Then the HNTs were sealed/capped using cobalt (II), aiming for an efficient and controlled release of the loaded inhibitor. The smart coatings were developed by reinforcing loaded HNTs into the epoxy matrix. The structural, thermal, mechanical, and electrochemical properties of capped modified HNTs and smart coatings were studied using various techniques. UV–Vis analysis depicted that the capping of the metal-inhibitor complex was decomposed at acidic pH resulting in a controlled release of the loaded inhibitor into HNTs. Electrochemical impedance spectroscopic (EIS) analysis of blank and smart coatings demonstrated that the low-frequency impedance modulus of smart coatings is 109 Ω.cm2 for 20 days compared to blank coatings (105 Ω.cm2), reflecting their excellent corrosion inhibition performance. The superior corrosion protection properties of these smart coatings can be ascribed to the controlled and efficient release of the loaded inhibitor from the capped HNTs. Finally, X-ray photoelectron spectroscopy (XPS) analysis of the steel substrate after the corrosion analysis revealed the adsorption of 8HQ on the steel surface, confirming the formation of iron complex due to the release of loaded inhibitor. This work demonstrated the adeptness of 8HQ in mitigating the corrosion due to the controlled and effective release of the inhibitor from capped HNTs because of dissociation of the metal-inhibitor complex (Co-8HQ).Kindly check and confirm the authors names are correctly identified.Checked Graphical abstract

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Clay Mineral Nanotubes: Stability, Structure and Properties

Cited by 6 publications

References 87 publications

Glyphosate adsorption on synthetic allophanes and halloysite: Effects of pH and mineral properties

Glyphosate adsorption on synthetic allophanes and halloysite: Effects of pH and mineral properties

Recent Developments on the Catalytic and Biosensing Applications of Porous Nanomaterials

Polymeric smart coatings containing modified capped halloysite nanotubes for corrosion protection of carbon steel

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