Highly Efficient Adsorption of Anionic Dye on Acid-Treated Halloysite Nanotubes
- Authors
- Lee, Hyungwook; Lee, Keonku; Park, Jongik; Lee, Jewon; Noh, Jaegeun
- Issue Date
- Aug-2020
- Publisher
- AMER SCIENTIFIC PUBLISHERS
- Keywords
- Halloysite Nanotubes; Acid-Treated Halloysite Nanotubes; Eosin Y; Adsorption; Scanning Electron Microscopy; Zeta Potential; Nanopores
- Citation
- JOURNAL OF NANOSCIENCE AND NANOTECHNOLOGY, v.20, no.8, pp.5024 - 5027
- Indexed
- SCIE
- Journal Title
- JOURNAL OF NANOSCIENCE AND NANOTECHNOLOGY
- Volume
- 20
- Number
- 8
- Start Page
- 5024
- End Page
- 5027
- URI
- https://scholarworks.bwise.kr/hanyang/handle/2021.sw.hanyang/145283
- DOI
- 10.1166/jnn.2020.17853
- ISSN
- 1533-4880
- Abstract
- The adsorption capability of eosin Y as a model anionic dye on natural halloysite nanotubes (HNTs) and sulfuric acid-treated HNTs as a function of acid treatment time (1 h, 3 h, and 5 h) was examined. Scanning electron microscopy revealed that natural HNTs had a very uniform surface, whereas acid-treated HNTs had a rough surface with structural defects, which increased with acid treatment time. The total specific pore volume and total surface area of the acid-treated HNTs increased due to formation of nanopores in the HNTs via dissolution of the inner AlO6 octahedral layer. With acid treatment, the surface xi-potentials were positively shifted from -42.9 mV (for the natural HNTs) to -1.9, -3.0, and +1.2 mV after 1, 3, and 5 h, respectively. The adsorption amount (q(e)) of eosin Y on natural HNTs and the three acid-treated HNTs was 2.3, 125.5, 118.9, and 118.9 mg g(-1), respectively, implying that the adsorption capacity of acid-treated HNTs is similar to 50 times higher than that of natural HNTs. In this study, we clearly demonstrated that acid-treated HNTs can be used as highly efficient nanomaterials for removal of dyes from wastewater containing anionic dyes.
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