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Adsorption of ammonium by different natural clay minerals: Characterization, kinetics and adsorption isotherms.
- Source :
-
Applied Clay Science . Jun2018, Vol. 159, p83-93. 11p. - Publication Year :
- 2018
-
Abstract
- This research presented six natural clay minerals (NCM) evaluated for the effectiveness of NH 4 + adsorption from aqueous solution. For the first time, the NH 4 + adsorption capacities of kaolinite, halloysite, montmorillonite, vermiculite, palygorskite, and sepiolite were examined and compared in the same study. All the NCM were fully characterized by XRD, SEM/EDS, XRF,FTIR, CEC, zeta potential and nitrogen adsorption-desorption isotherms to better understand the adsorption mechanism-property relationship. Adsorption kinetics showed that the adsorption behavior followed the pseudo-second-order kinetic model. The adsorption isotherms fitted by the Langmuir model illustrated that among all the NCM studied, vermiculite (50.06 mg/g) and montmorillonite (40.84 mg/g) showed the highest ammonium adsorption capacities. Our results revealed that the cation exchange is the main mechanism for the NH 4 + adsorption. Additionally, negatively charged surface, water absorption process and surface morphology of NCM might also contribute to the high adsorption capacity for the NH 4 + . The maximum adsorption capacities for all NCM were rapidly obtained within 30 min with a dosage of 0.3 g/25 mL at pH of 7. The results illustrated that the NCM have significant potential as economic, safe and effective adsorbent materials for the NH 4 + adsorption from the aqueous solution. [ABSTRACT FROM AUTHOR]
- Subjects :
- *AMMONIUM
*DYNAMICS
*ADSORPTION isotherms
*AQUEOUS solutions
*KAOLINITE
*HALLOYSITE
Subjects
Details
- Language :
- English
- ISSN :
- 01691317
- Volume :
- 159
- Database :
- Academic Search Index
- Journal :
- Applied Clay Science
- Publication Type :
- Academic Journal
- Accession number :
- 129507651
- Full Text :
- https://doi.org/10.1016/j.clay.2017.11.007