Journal
CARBOHYDRATE POLYMERS
Volume 107, Issue -, Pages 103-109Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.carbpol.2014.02.001
Keywords
Halloysite; Hydrothermal synthesis; NaA zeolite; Chitosan beads; Ammonium removal
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Funding
- National Natural Science Foundation of China [21271158, 20871105]
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Inorganic/organic hybrid materials play important roles in removal of contaminants from wastewater. Herein, we used the natural materials of halloysite and chitosan to prepare a new adsorbent of NaA zeolite/chitosan porous hybrid beads by in-situ hydrothermal synthesis method. SEM indicated that the porous hybrid beads were composed of 6-8 mu m sized cubic NaA zeolite particles congregated together with chitosan. The adsorption behavior of NH4+ from aqueous solution onto hybrid beads was investigated at different conditions. The Langmuir and Freundlich adsorption models were applied to describe the equilibrium isotherms. A maximum adsorption capacity of 47.62 mg/g at 298 K was achieved according to Langmuir model. The regenerated or reused experiments indicated that the adsorption capacity of the hybrid beads could maintain in 90% above after 10 successive adsorption-desorption cycles. The high adsorption and reusable ability implied potential application of the hybrid beads for removing NH4+ pollutants from wastewater. (C) 2014 Elsevier Ltd. All rights reserved.
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