Zheng Y, Wang A. Evaluation of ammonium removal using a chitosan-g-poly (acrylic acid)/rectorite hydrogel composite.
JOURNAL OF HAZARDOUS MATERIALS 2009;
171:671-677. [PMID:
19577362 DOI:
10.1016/j.jhazmat.2009.06.053]
[Citation(s) in RCA: 52] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/14/2009] [Revised: 06/07/2009] [Accepted: 06/11/2009] [Indexed: 05/28/2023]
Abstract
This paper concerns the removal of ammonium ions (NH(4)(+)) from aqueous solution using a hydrogel composite chitosan grafted poly (acrylic acid)/rectorite prepared from in situ copolymerization. The effects of rectorite content, contact time, pH, NH(4)(+) concentration and temperature on the adsorption capacity were discussed. Langmuir, Freundlich, Tempkin and Redlich-Peterson isotherms were used to describe the experimental data. The results indicate that the adsorption equilibrium can be achieved within 3-5 min and, the hydrogel composite has a higher adsorption capacity for NH(4)(+) in a wide pH levels ranged from 4.0 to 9.0. No significant changes in the adsorption capacity are found over the temperature range studied. The adsorption mechanism of NH(4)(+) onto hydrogel composite was proposed, and the reusable ability of this hydrogel adsorbent was evaluated.
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