期刊
JOURNAL OF COLLOID AND INTERFACE SCIENCE
卷 359, 期 1, 页码 261-268出版社
ACADEMIC PRESS INC ELSEVIER SCIENCE
DOI: 10.1016/j.jcis.2011.02.071
关键词
Arsenic adsorption; Boron nitride nanotube; Functionalization; Nanoparticle; Nanostructure
Multiwalled boron nitride nanotubes (BNNTs) functionalized with Fe3O4 nanoparticles (NPs) were used for arsenic removal from water solutions. Sonication followed by a heating process was developed to in situ functionalize Fe3O4 NPs onto a tube surface. A batch of adsorption experiments conducted at neutral pH (6.9) and room temperature (25 degrees C) and using the developed nanocomposites revealed effective arsenic (V) removal. The Langmuir, Freundlich, and Dubinin-Radushkevich adsorption isotherms were measured for a range of As(V) initial concentrations from 1 to 40 mg/L under the same conditions. The equilibrium data well fitted all isotherms, indicating that the mechanism for As(V) adsorption was a combination of chemical complexation and physical electrostatic attraction with a slight preference for chemisorption. The magnetite NPs functionalized on BNNTs led to a simple and rapid separation of magnetic metal-loaded adsorbents from the treated water under an external magnetic field. (c) 2011 Elsevier Inc. All rights reserved.
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