Impact of sulfuric acid treatment of halloysite on physico-chemic property modification

Tayser Sumer Gaaz, Abu Bakar Sulong, Abdul Amir H. Kadhum, Mohamed H. Nassir, Ahmed A. Al-Amiery

Research output: Contribution to journalArticle

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Abstract

Halloysite (HNT) is treated with sulfuric acid and the physico-chemical properties of its morphology, surface activity, physical and chemical properties have been investigated when HNT is exposed to sulfuric acid with treatment periods of 1 h (H1), 3 h (H3), 8 h (H8), and 21 h (H21). The significance of this and similar work lies in the importance of using HNT as a functional material in nanocomposites. The chemical structure was characterized by Fourier transform infrared spectroscopy (FTIR). The spectrum demonstrates that the hydroxyl groups were active for grafting modification using sulfuric acid, promoting a promising potential use for halloysite in ceramic applications as filler for novel clay-polymer nanocomposites. From the X-ray diffraction (XRD) spectrum, it can be seen that the sulfuric acid breaks down the HNT crystal structure and alters it into amorphous silica. In addition, the FESEM images reveal that the sulfuric acid treatment dissolves the AlO6 octahedral layers and induces the disintegration of SiO4 tetrahedral layers, resulting in porous nanorods. The Bruncher-Emmett-Teller (BET) surface area and total pore volume of HNTs showed an increase. The reaction of the acid with both the outer and inner surfaces of the nanotubes causes the AlO6 octahedral layers to dissolve, which leads to the breakdown and collapse of the tetrahedral layers of SiO4. The multi-fold results presented in this paper serve as a guide for further HNT functional treatment for producing new and advanced nanocomposites.

Original languageEnglish
Article number620
JournalMaterials
Volume9
Issue number8
DOIs
Publication statusPublished - 26 Jul 2016

Fingerprint

Sulfuric acid
Nanocomposites
Chemical properties
Functional materials
Disintegration
Nanorods
Silicon Dioxide
Hydroxyl Radical
Nanotubes
Fourier transform infrared spectroscopy
Surface morphology
Fillers
Polymers
Clay
Physical properties
Crystal structure
Silica
sulfuric acid
clay
X ray diffraction

Keywords

  • Halloysite nanotubes
  • Morphology
  • Sulfuric acid
  • Surface area

ASJC Scopus subject areas

  • Materials Science(all)

Cite this

Impact of sulfuric acid treatment of halloysite on physico-chemic property modification. / Gaaz, Tayser Sumer; Sulong, Abu Bakar; Kadhum, Abdul Amir H.; Nassir, Mohamed H.; Al-Amiery, Ahmed A.

In: Materials, Vol. 9, No. 8, 620, 26.07.2016.

Research output: Contribution to journalArticle

Gaaz, Tayser Sumer ; Sulong, Abu Bakar ; Kadhum, Abdul Amir H. ; Nassir, Mohamed H. ; Al-Amiery, Ahmed A. / Impact of sulfuric acid treatment of halloysite on physico-chemic property modification. In: Materials. 2016 ; Vol. 9, No. 8.
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