期刊
MICROPOROUS AND MESOPOROUS MATERIALS
卷 201, 期 -, 页码 190-201出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.micromeso.2014.09.003
关键词
Nanotube; Composite; Adsorption; Interactions; Adsorption kinetics
类别
资金
- Guangdong Natural Science funds for distinguished young scholar [S2013050014606]
- foundation for the author of Guangdong Excellent Doctoral Dissertation [sybzzxm201220]
- Guangdong Ocean Economic Innovative Development [GD2012-B03-009]
- Special Fund for Ocean-Scientific Research in the public interest [201405105]
- Department of Education of Guangdong Province [cxzd1108]
Composite hydrogel beads containing chitosan and halloysite nanotubes (HNTs) with a well defined structure were prepared by the dropping and pH-precipitation method. The influence of HNTs on the appearance, diameter, microstructures, and thermal stability of the chitosan beads was characterized. The composite hydrogels exhibit slightly increased diameter and improved thermal stability. A rough surface and high concentration of the nanotubes in the bead core are found in the composite beads. The hydrogel beads were employed as absorbents for removal of methylene blue and malachite green from aqueous solutions and the fundamental adsorption behavior was studied. Both Langmuir isotherm and Freundlich isotherm models can fit the isotherm absorption data well. The addition of HNTs can significantly increase the adsorption rate of chitosan beads for the two dyes. Moreover, with the increase of the amount of hydrogel beads in the dye solution, the removal ratio of dyes increases but the absorption amount per unit absorbent weight gradually reduces. The adsorption kinetics closely follows pseudo-second order model. The regeneration experimental shows that the adsorption ability of all the beads can be recovered especially for methylene blue. So the chitosan-HNTs composite hydrogels can be potentially used for the removal of dyes from wastewater. (C) 2014 Elsevier Inc. All rights reserved.
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