title: Hybrid multiwalled carbon nanotube--Laponite sorbent for removal of methylene blue from aqueous solutions.
abstract: The article discusses adsorption of methylene blue dye by novel hybrid sorbent consisting of Laponite and multiwalled carbon nanotubes. The sorbent was obtained by sonication of the aqueous suspensions of nanotubes at different concentrations of Laponite. The methods of the methylene blue adsorption, dead-end membrane filtration and environmental scanning electron microscopy were used for the sorbent characterization. It may be concluded from the results of filtration and adsorption experiments that sonication of mixed aqueous suspensions of Laponite and multiwalled carbon nanotubes leads to the formation of hybrid particles (ML-particles) with a core-shell structure. The size and the shape of hybrid particles were determined by nanotubes, while their adsorption properties were determined by Laponite particles attached to the surface of nanotubes. The Laponite content in hybrid particles was corresponding to the Laponite to nanotubes ratio in the initial suspension X(L)=0-1. Due to the presence of Laponite in the sorbent, its adsorbing capacity was much higher as compared to the adsorbing capacity of pure nanotubes, and it was directly proportional to the Laponite content. This sorbent may be used either as a purifying additive or as a filtering layer if it is deposited on the surface of a supporting membrane. Due to relatively large size of hybrid particles, they can be easily separated from the purified solution by filtration or centrifugation.
authors: Université de Technologie de Compiègne, Département de Génie des procédés industriels, Unité Transformations Intégrées de la Matière Renouvelable, Centre de Recherche de Royallieu, B.P. 20529-60205 Compiègne Cedex, France; Institute of Biocolloidal Chemistry Named After F.D. Ovcharenko, NAS of Ukraine, 42, blvr. Vernadskogo, Kyiv 03142, Ukraine.
authors: Maksym
authors: M
authors: Loginov
authors: Université de Technologie de Compiègne, Département de Génie des procédés industriels, Unité Transformations Intégrées de la Matière Renouvelable, Centre de Recherche de Royallieu, B.P. 20529-60205 Compiègne Cedex, France; Institute of Biocolloidal Chemistry Named After F.D. Ovcharenko, NAS of Ukraine, 42, blvr. Vernadskogo, Kyiv 03142, Ukraine. Electronic address: lebovka@gmail.com.
authors: Nikolai
authors: N
authors: Lebovka
authors: Université de Technologie de Compiègne, Département de Génie des procédés industriels, Unité Transformations Intégrées de la Matière Renouvelable, Centre de Recherche de Royallieu, B.P. 20529-60205 Compiègne Cedex, France.
authors: Eugene
authors: E
authors: Vorobiev
mesh_terms: D000327:Adsorption; D008751:Methylene Blue / Q000737:chemistry*; D037742:Nanotubes, Carbon / Q000737:chemistry*; D017640:Silicates / Q000737:chemistry*; D018508:Water Purification / Q000379:methods*
chemical_list: D037742:Nanotubes, Carbon; D017640:Silicates; C524813:laponite; D008751:Methylene Blue
keywords: Adsorption; Dye; Filtration; Hybrid sorbent; Laponite; Multiwalled carbon nanotubes; Purification