Removal characteristics of ammonium nitrogen from wastewater by modified Ca-bentonites

Sun, Zhiming, Qu, Xiaosuo, Wang, Gaofeng, Zheng, Shuilin, & Frost, Ray L. (2015) Removal characteristics of ammonium nitrogen from wastewater by modified Ca-bentonites. Applied Clay Science, 107, pp. 46-51.

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Abstract

A modified inorganic bentonite (Na/Al) based on purified Ca-bentonite was prepared through exchanging Al and Na ions in the interlayer space of Ca-bentonite. The structural properties of purified and modified bentonites were characterized by XRD and SEM analysis. Batch experiments were performed for the adsorption of ammonium nitrogen and different experimental conditions were studied in order to investigate the optimum adsorption conditions. Comparative experiments were also carried out for natural Ca-bentonite (RB), unmodified purified bentonite (PB) and modified purified bentonite (MB). Through the thermodynamic analysis, the ammonium nitrogen adsorption process can be spontaneous, the standard heat was −41.46kJmol −1 , and the adsorption process based on ion exchange adsorption. The ammonium nitrogen adsorption capacity of MB (46.904mg/g) was improved compared to raw bentonite (RB) (26.631mg/g), which was among the highest values of ammonium nitrogen adsorption compared with other adsorbents according to the literatures. The described process provides a potential pathway for the removal of ammonium nitrogen at low concentrations encountered in most natural waters.

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ID Code: 83745
Item Type: Journal Article
Refereed: Yes
Keywords: Adsorption, Ammonium nitrogen, Bentonite, Environment
DOI: 10.1016/j.clay.2015.02.003
ISSN: 0169-1317
Divisions: Current > Schools > School of Chemistry, Physics & Mechanical Engineering
Current > QUT Faculties and Divisions > Science & Engineering Faculty
Copyright Owner: Copyright 2015 Elsevier B.V.
Copyright Statement: Licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International http://creativecommons.org/licenses/by-nc-nd/4.0/
Deposited On: 26 Apr 2015 22:51
Last Modified: 04 Nov 2015 07:00

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