4.7 Article

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

Journal

JOURNAL OF ENVIRONMENTAL MANAGEMENT
Volume 196, Issue -, Pages 72-79

Publisher

ACADEMIC PRESS LTD- ELSEVIER SCIENCE LTD
DOI: 10.1016/j.jenvman.2017.03.015

Keywords

Nepheline; Hydrothermal synthesis; Kaolinite; Adsorption; Fluoride

Funding

  1. National Key Basic Research Program of China (973 Program) [2014CB643400]
  2. National Key Technology R&D Program of China [2012BAB07B02]
  3. National Natural Science Foundation of China [51104180]
  4. Hunan Provincial Natural Science Foundation of China [13JJ4015]
  5. Teacher Research Foundation of Central South University

Ask authors/readers for more resources

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 (Delta G degrees, Delta H degrees, and Delta S degrees) 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. (C) 2017 Elsevier Ltd. All rights reserved.

Authors

I am an author on this paper
Click your name to claim this paper and add it to your profile.

Reviews

Primary Rating

4.7
Not enough ratings

Secondary Ratings

Novelty
-
Significance
-
Scientific rigor
-
Rate this paper

Recommended

No Data Available
No Data Available