Fabrication of novel sandwich nanocomposite as an efficient and regenerable adsorbent for methylene blue and Pb (II) ion removal.
J Environ Manage
; 218: 363-373, 2018 Jul 15.
Article
en En
| MEDLINE
| ID: mdl-29704832
ABSTRACT
An adsorbent, which is easy to be separated and reused after adsorption, is very important for the removal of pollutants in aqueous solution. Hence, a novel nanofibrous sandwich structured adsorbent of silica nanofiber/magnetite nanoparticles/porous silica (SNF/MNP/PS) was designed and synthesized for the first time. The magnetite nanoparticles with diameter less than 10â¯nm were evenly distributed on the surface of silica nanofiber, which was subsequently fully covered by a layer of porous silica. The novel adsorbent was proved possessing good adsorption capacity for both methylene blue (MB) and Pb (II) ion (Pb2+), and the adsorption equilibrium could be well described by the Langmuir-isotherm model with the maximum adsorption capacity of 103.1â¯mg/g for MB and 243.9â¯mg/g for Pb2+ at 288â¯K. Moreover, in MB-Pb2+ mixed system the measured adsorption capacity reached 74.5â¯mg/g for MB and 202.4â¯mg/g for Pb2+, respectively. The saturated adsorbent could be readily magnetically separated from the solution and then efficiently regenerated by heterogeneous Fenton-like reaction (for MB) or acidic desorption process (for Pb2+), respectively. After 5 cycles of adsorption-regeneration, the adsorption capacity of the reused adsorbent still reached 81.0% (for MB) and 70.9% (for Pb2+) of the initial value. The SNF/MNP/PS behaves good adsorption properties for different types of pollutants, high magnetic recoverability and regeneration efficiency, which make it applicable to different contaminants removal.
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MEDLINE
Asunto principal:
Nanocompuestos
/
Plomo
/
Azul de Metileno
Idioma:
En
Año:
2018
Tipo del documento:
Article