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Highly efficient fluoride adsorption from aqueous solution by nepheline prepared from kaolinite through alkali-hydrothermal process.

Authors :
Wang, Hao
Feng, Qiming
Liu, Kun
Li, Zishun
Tang, Xuekun
Li, Guangze
Source :
Journal of Environmental Management. Jul2017, Vol. 196, p72-79. 8p.
Publication Year :
2017

Abstract

A direct alkali-hydrothermal induced transformation process was adopted to prepare nepheline from raw kaolinite (shortened form RK in this paper) and NaOH solution in this paper. Structure and morphology characterizations of the synthetic product showed that the nepheline possessed high degree of crystallinity and uniform surface morphology. Specific surface area of nepheline is 18 m 2 /g, with a point of zero charge at around pH 5.0–5.5. The fluoride (F − ions) adsorption by the synthetic nepheline (shortened form SN in this paper) from aqueous solution was also investigated under different experimental conditions. The adsorption process well matched the Langmuir isotherm model with an amazing maximum adsorption capacity of 183 mg/g at 323 K. The thermodynamic parameters (ΔG 0 , ΔH 0 , and ΔS 0 ) for adsorption on SN were also determined from the temperature dependence. The adsorption capacities of fluoride on SN increased with increasing of temperature and initial concentration. Initial pH value also had influence on adsorption process. Adsorption of fluoride was rapidly increased in 5–60 min and thereafter increased slowly to reach the equilibrium in about 90–180 min under all conditions. The adsorption followed a pseudo-second order rate law. [ABSTRACT FROM AUTHOR]

Details

Language :
English
ISSN :
03014797
Volume :
196
Database :
Academic Search Index
Journal :
Journal of Environmental Management
Publication Type :
Academic Journal
Accession number :
122775419
Full Text :
https://doi.org/10.1016/j.jenvman.2017.03.015