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

Shu, Zhu; Chen, Yun; Zhou, Jun; Li, Tiantian; Yu, Dongxue; Wang, Yanxin

doi:10.1016/j.clay.2015.04.014

Cited by 53 publications

(25 citation statements)

References 48 publications

(56 reference statements)

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“…All the acid-treated samples are amorphous ( Fig. 2) and composed of mainly SiO 2 (above 95%) and traces of Al Table 3) reaches up to 767 m 2 /g, which is much superior to those of the halloysite-derived nanoporous silica in literatures (below 608 m 2 /g) [7][8][9][10]15] . The N 2 adsorption-desorption isotherms (insert in Fig.…”

Section: Acid-etching Of the Alkali-treated Precalcined Halloysitementioning

confidence: 81%

“…For example, Abdullayev, et al [7] and Zhang, et al [8] treated halloysite with sulphuric acid to etch the aluminum oxide component, and obtained the nanoporous silica nanotube with specific surface area (SSA) of 250 m 2 /g and 267 m 2 /g, respectively. Shu, et al [9] found that pre-calcining halloysite could activate the tubewall framework, and then, acid-etching resulted in mesoporous silica nanotube with enlarged SSA of 415 m 2 /g. In order to further improve SSA, Shu, et al [10] introduced a short-term NaOH treat-ment on the pre-calcined halloysite, and then etched it with acid, producing mesoporous silica nanotubes with SSA as high as 608 m 2 /g.…”

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confidence: 99%

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Template-free Synthesis of Mesoporous Silica with High Specific Surface Area from Natural Halloysite and Its Application in Methylene Blue Adsorption

Meng-Qiu¹,

Chen²,

Zhu³

et al. 2018

Journal of Inorganic Materials

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Avoiding the use of templates and employing natural minerals as raw materials could promote the cost-efficient preparation of mesoporous materials. This work demonstrated a template-free route to process natural halloysite into mesoporous silica with high specific surface area (SSA) up to 767 m 2 /g and pore size of about 5 nm.The halloysite was successively calcined, alkali-treated and acid-treated. The transformation of calcined halloysite into crystalline sodium aluminosilicate (zeolite LTA) by longtime alkali-treating, was found to be the key for obtaining high-SSA mesoporous silica in the final acid treatment. The optimized mesoporous silica showed a monolayer adsorption capacity as high as 741 mg/g for methylene blue, suggesting its great potential in adsorption applications.

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Section: Acid-etching Of the Alkali-treated Precalcined Halloysitementioning

confidence: 81%

mentioning

confidence: 99%

Template-free Synthesis of Mesoporous Silica with High Specific Surface Area from Natural Halloysite and Its Application in Methylene Blue Adsorption

Meng-Qiu¹,

Chen²,

Zhu³

et al. 2018

Journal of Inorganic Materials

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“…Therefore, the common organic clay 93A and high-density polyethylene (HDPE) were used to study the effect of heat treatment temperature on the degree of stripping of organic clay under the action of different compatibilizers. The results have an important guiding role in the industrial production of clay composite materials [8][9][10] .…”

Section: Introductionmentioning

confidence: 88%

Heat treatment effect on the distribution of organic clay in polymer nanocomposites

et al. 2020

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In this paper, the effects of heat treatment temperature on the degree of exfoliation of organic clay under different compatibilizers were tested by using organic clay 93A, high density polyethylene (HDPE) and compatibilizer (PE-g-MA), polyethylene maleic anhydride copolymer (PEMA), maleic anhydride and polyethylene blend (MA/PE). The proportion of organic clay is 5 wt%, HDPE is 90 wt% and compatibilizer is 5 wt%. Temperature ranged from 210 o C to 250 o C, the position of [001] peak in the sample was determined, FESEM, TGA, FTIR and XRD was used to analyze the influence of temperature on the distribution behavior of clay in polymer system. The results are very significant for the industrial production of clay composite materials.

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“…Enlargement of the halloysite lumen leads to an increase of the silver nanorod diameter to 20 nm. Halloysite walls in the final product can be etched by alkaline solution (or with HF) to yield free‐standing nanorods …”

Section: Halloysite – Metal Nanoparticles Architecturesmentioning

confidence: 99%

Nanoparticles Formed onto/into Halloysite Clay Tubules: Architectural Synthesis and Applications

Винокуров

Stavitskaya

Glotov

et al. 2018

The Chemical Record

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Nanoparticles, being objects with high surface area are prone to agglomeration. Immobilization onto solid supports is a promising method to increase their stability and it allows for scalable industrial applications, such as metal nanoparticles adsorbed to mesoporous ceramic carriers. Tubular nanoclay - halloysite - can be an efficient solid support, enabling the fast and practical architectural (inside / outside) synthesis of stable metal nanoparticles. The obtained halloysite-nanoparticle composites can be employed as advanced catalysts, ion-conducting membrane modifiers, inorganic pigments, and optical markers for biomedical studies. Here, we discuss the possibilities to synthesize halloysite decorated with metal, metal chalcogenide, and carbon nanoparticles, and to use these materials in various fields, especially in catalysis and petroleum refinery.

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

Cited by 53 publications

References 48 publications

Template-free Synthesis of Mesoporous Silica with High Specific Surface Area from Natural Halloysite and Its Application in Methylene Blue Adsorption

Template-free Synthesis of Mesoporous Silica with High Specific Surface Area from Natural Halloysite and Its Application in Methylene Blue Adsorption

Heat treatment effect on the distribution of organic clay in polymer nanocomposites

Nanoparticles Formed onto/into Halloysite Clay Tubules: Architectural Synthesis and Applications

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