High removal capacity of silver ions from aqueous solution onto Halloysite nanotubes

Kiani, Gholamreza

doi:10.1016/j.clay.2014.01.010

Cited by 70 publications

(20 citation statements)

References 26 publications

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“…In the past decade, there are many halloysite-related works, such as halloysite-based adsorbents (Viseras et al, 2008;Zhao and Liu, 2008;Kiani et al, 2011;Kadi et al, 2012;Kiani, 2014), catalysts (Barrientos-Ramirez et al, 2009;, advanced ceramics (Fu and Zhang, 2005), polymer nanocomposites Pasbakhsh et al, 2013;Carli et al, 2014;Sarifuddin et al, 2014;Yang et al, 2014), hard template (Zhou et al, 2011), and drug loading and releasing (Tan et al, 2014). Nonetheless, the halloysite nanotubes (abbreviated as Hal hereafter) feature a solid tube wall of tens of nanometers in thickness, which restricts the Hal with a confined specific surface area S BET of around 50 m 2 /g .…”

Section: Introductionmentioning

confidence: 99%

Nanoporous-walled silica and alumina nanotubes derived from halloysite: controllable preparation and their dye adsorption applications

Shu

Chen

Zhou

et al. 2015

Applied Clay Science

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Section: Introductionmentioning

confidence: 99%

Nanoporous-walled silica and alumina nanotubes derived from halloysite: controllable preparation and their dye adsorption applications

Shu

Chen

Zhou

et al. 2015

Applied Clay Science

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“…Based on their results, organosilanemodified halloysite appears to be a versatile host for loading various functional guests, e.g., bio-molecules and drugs. Furthermore, halloysite could be developed as a metal complexing agent by surface modification with sulfhydryl silane to load transition metal ions (e.g., Ag + , Cu 2+ , and Zn 2+ ) (Mellouk et al, 2009;Kiani, 2014) for antimicrobial agent applications in the medical or coating fields (Carli et al, 2014). The applications of HNTs in the fabrication of polymer nanocomposites were emphasized (Du et al, 2006(Du et al, , 2008(Du et al, , 2010.…”

Section: Introductionmentioning

confidence: 99%

Applications and interfaces of halloysite nanocomposites

Zhang

Tang

Yang

et al. 2016

Applied Clay Science

259

103

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“…Tubular halloysite, on the other hand, would be better suited for this purpose because of its unique one-dimensional tubular porous structure (Theng, 1974). Tubular halloysites, whether used as drug carriers or as metal-ion adsorbents, are often studied in the dehydrated state (Tan et al, 2014;Kiani, 2014). As a result, multiple internal pores are observed in the particles along the long tubular pores.…”

Section: Discussionmentioning

confidence: 99%

“…Natural mineral materials such as halloysite are considered for environmental and pharmaceutical applications due to their great propensity to intercalate metal ions or organic molecules (Theng, 1974;Joussein et al, 2007;Tan et al, 2014;Kiani, 2014). The morphology and internal porous structure of this mineral are believed to influence directly its potential use as a nanoadsorbent.…”

Section: Introductionmentioning

confidence: 99%

Native Morphology of Hydrated Spheroidal Halloysite Observed by Environmental Transmission Electron Microscopy

Berthonneau

Grauby

Jeannin

et al. 2015

Clays and clay miner.

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Natural mineral materials such as tabular and spheroidal halloysites have recently been suggested as candidates for intercalating metal ions or organic molecules. Their potential use as nanoadsorbents is related to their porous structure and water content. Although the two morphologies can coexist in natural deposits, spheroidal halloysites remain poorly characterized whereas much literature exists on tubular halloysites. The present study investigates the native morphology, internal porous structure, and behavior upon dehydration of spheroidal halloysite from Opotiki (New Zealand). This mineral was characterized in its natural hydrated state using a transmission electron microscope equipped with an environmental cell (EC-TEM). The sample was placed in a sealed block in which water vapor-saturated air circulated at a pressure of 30 Torr. The observed particles consisted of almost complete spheroids displaying polyhedral external surfaces. 1:1 layers stack concentrically as a pore-free, onion-like structure. The dynamic processes of dehydration created by slow depressurization of the cell resulted in a decrease in the layer-to-layer distance (d 001 ) from~10 Å to~7 Å due to the loss of interlayer water molecules. Irreversible formation of spurious 'internal pores' was recorded during this process. These pores were not indigenous to the hydrated 10 Å halloysite and resulted from the collapse of the native layers. They cannot account for the physical chemical properties of spheroidal halloysite. Spheroidal halloysites would have a lower propensity for intercalating ions or molecules than tubular halloysites. Isolated facets were also observed in high-resolution-TEM and displayed a pseudo-hexagonal morphology. The three-dimensional microstructure of the spheroid appeared bent along the three pseudo equivalent y i directions of the kaolinite-like single layers. An analogy with polyhedral serpentine has allowed the proposal of a formation process of hydrated spheroidal halloysite triggered by enrichment in divalent ions in the growth system.

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High removal capacity of silver ions from aqueous solution onto Halloysite nanotubes

Cited by 70 publications

References 26 publications

Nanoporous-walled silica and alumina nanotubes derived from halloysite: controllable preparation and their dye adsorption applications

Nanoporous-walled silica and alumina nanotubes derived from halloysite: controllable preparation and their dye adsorption applications

Applications and interfaces of halloysite nanocomposites

Native Morphology of Hydrated Spheroidal Halloysite Observed by Environmental Transmission Electron Microscopy

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