期刊
APPLIED CLAY SCIENCE
卷 132, 期 -, 页码 114-121出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.clay.2016.05.024
关键词
Halloysite; Mesoporous materials; Silica nanotube; Dye adsorption
资金
- National Natural Science Foundation of China [41502030, 41002124]
- Fundamental Research Funds for the Central Universities [CUG160615, CUGL140811]
- Hubei Environmental Protection Bureau [2013HB10]
The enlargement of specific surface area of halloysite-derived nanotubes could benefit the performance and applications of halloysite mineral. In this work, we propose and demonstrate a novel approach to prepare halloysite-derived mesoporous silica nanotubes with substantial specific surface area. The specific surface area up to 608 m(2)/g is achieved from the natural halloysite (Hal) via a simple process of calcination, alkali-treating and acid-etching. The amorphous Si-O-Al network of the calcined Hal is alkali-treated, becoming an amorphous hydroxyl-enriched sodium aluminum silicate phase. The Al-O and Na-O compositions are selectively acid etched to in-situ develop mesopores within the residual silica framework, producing the hydroxyl-enriched mesoporous silica nanotubes. The alkali-treatment is crucial to determine the morphology and porosity of the final nanotubes. The optimized mesoporous silica nanotubes behave favorable monolayer adsorption with capacity of 618 mg/g for methylene blue, allowing a promising adsorbent in the future. (C) 2016 Elsevier B.V. All rights reserved.
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