Hybrid multiwalled carbon nanotube − Laponite sorbent for removal of methylene blue from aqueous solutions

Loginov, Maksym; Lebovka, Nikolaï; Vorobiev, Eugène

doi:10.1016/j.jcis.2014.06.057

Cited by 21 publications

(15 citation statements)

References 77 publications

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“…Recently, a new type of hybrid based on MWCNTs covered by platelets of Laponite RD® (Lap) was described [16] [38]). Adhesion of charged Lap nanoparticles on the surface of nanotubes improved their dispersion [10,29,[39][40][41][42][43][44]. Addition of Lap resulted in efficient dispersion of MWCNT aggregates and separation of individual nanotubes (Fig.…”

Section: Fig 6 Adsorption Mechanisms Of Ctab On the Surface Of Carbmentioning

confidence: 99%

A short review on regulation of stability of aqueous suspensions of carbon nanotubes

Manilo¹,

Lebovka²,

Bárány³

2020

Him. Fiz. Tehnol. Poverhni

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This review analyses the authors' recent and related works on electrokinetic properties and colloidal stability of aqueous suspension of multi-walled carbon nanotubes (CNTs) in the presence of surfactants and nanoparticles. Selected adsorptive properties of carbon nanotubes are also considered.The applicability of classical theories of electrophoresis for description of electrophoretic mobility of carbon nanotubes is discussed. Examples on the ζ-potential of CNTs in aqueous suspensions as a function of pH and concentration of electrolytes (KCl, CaCl 2 and AlCl 3 ) are given. Additions of cetyltrimethylammonium bromide (CTAB) cationic surfactant below the critical micelle formation concentration (CMC) values give a reduction and then an overcharging the CNT surface because of accumulation of the surfactant ions in the Stern layer. At concentrations above CMC the substantial drop in ζ-potential is observed. It is due to the shift of the shear plane toward solution as a result of formation of hemi-micelles on the surface. An increase in the mass ratio of artificial mineral Laponite (Lap) in suspension (X) from 0 to 0.4 results in a monotonic decrease of the ζ-potential of CNT + Lap hybrids with reaching its plateau value ≈ -32 mV at X ≥ 0.4 that corresponds to the ζ-potential of "pure" Lap platelets. This evidences the high surface coverage of nanotubes surface with Lap at X ≥ 0.4.The major methods to improve the dispersibility of carbon nanotubes, their colloidal stability and adsorptive properties are briefly discussed, namely: stabilization in mixtures of water and organic solvents; functionalization by chemical treatment; stabilization by additives of surfactants or polymers and hybridization by addition of supplementary stabilizing nanoparticles. CNTs can be significantly debundled in "good" solvents, such as 1cyclohexyl-2-pyrrolidone, N,N-dimethylformamide, or N-methyl-2-pyrrolidone. It is demonstrated that the dispersibility of CNTs is a complex function of the type of surfactant, its concentration and the surfactant/CNTs ratio. The optimum concentration of CTAB to achieve homogeneous aqueous dispersion of carbon nanotubes was identified to be near the CMC. Additions of CTAB significantly modify the size distribution of CNTs and a sharp transition from small primary aggregates to large secondary aggregates at concentrations above CMC is observed. At optimal concentration of Lap the nanotube particles get well stabilized, and a stepwise increase of sedimentation stability is observed.We have shown also that CNT + Lap hybrids can be effectively used for removal of methylene blue dye from aqueous systems. The kinetics and mechanisms of adsorption are elucidated.

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Section: Fig 6 Adsorption Mechanisms Of Ctab On the Surface Of Carbmentioning

confidence: 99%

A short review on regulation of stability of aqueous suspensions of carbon nanotubes

Manilo¹,

Lebovka²,

Bárány³

2020

Him. Fiz. Tehnol. Poverhni

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“…Dispersability of CNTs can be enhanced also by introduction of supplementary colloidal particles into the suspension [73][74][75][76][77][78]. In particular, it was shown that introduction of charged laponite platelets (Lap) significantly improved the dispersability of MWCNTs in aqueous suspensions [77].…”

Section: Dispersing Of Cntsmentioning

confidence: 99%

Carbon Nanotubes in Liquid Crystals: Fundamental Properties and Applications

Lisetski

Soskin

Lebovka

2015

Springer Proceedings in Physics

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The structure and properties of liquid crystalline suspensions filled by carbon nanotubes (CNTs) are critically reviewed. Special attention is paid to interactions between CNTs and molecules of the liquid crystals (LC), which lead to formation of ordered supramolecular structures. These structures, in turn, determine unique physical properties of LC + CNT suspensions, including electrical conductivity, dielectric permittivity, phase transitions, optical transmission, memory effects that can be used in electrooptic and optoelectronic devices, etc. Great variety of LC phases are considered as a host media, such as nematics, cholesterics, smectics of different types (including ferroelectrics), lyotropic, chromonic, ionic and hydrogen-bonded liquid crystals. Alongside multi-and single-walled carbon nanotubes, the suspensions can also contain the platelets of organoclays used for facilitation of CNT dispersing. Recent practical applications of LC + CNT suspensions and nanomaterials based thereon are also outlined.

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“…Moreover, different clays were used for environmental remediation for the removal of heavy metals [14,15], the antimicrobial peptides nisin and pediocin [16], herbicides [17], vitamin B1 [18], and different organic dyes [19][20][21][22][23]. However, the application of synthetic nano-clay magadiite(SNCM) for the elimination and remediation of different contaminants from the water environment is rare in the literature [24][25][26]; extra effort is desired to discover the adsorption capabilities of synthetic nano-clay magadiite as an effective adsorbent for the elimination of organic dye, as an specimen of organic contaminants-a main class of ecological contaminants that are insistent in the environment and cause antagonistic possessions on both fauna and flora.…”

Section: Introductionmentioning

confidence: 99%

Application of Synthetic Layered Sodium Silicate Magadiite Nanosheets for Environmental Remediation of Methylene Blue Dye in Water

Mokhtar

2017

Preprint

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Abstract:The removal of methylene blue (MB) dye from water was investigated using synthetic nano-clay magadiite (SNCM). SNCM was synthesized by hydrothermal treatment under autogenous pressure. A rosette-shaped single mesoporous magadiite phase with 16.63 nm average crystallite size and 33mBET-surface area was recorded. The adsorption results indicated the pronounced affinity of the SNCM to the MB dye molecules which reached adsorption uptake of 20.0 mg MB dye/g of SNCM. The elimination of MB dye by the SNCM was kinetically and thermodynamically considered; a pseudo second order kinetic model was attained, and a spontaneous, chemical, and exothermic in nature was verified.

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Hybrid multiwalled carbon nanotube − Laponite sorbent for removal of methylene blue from aqueous solutions

Cited by 21 publications

References 77 publications

A short review on regulation of stability of aqueous suspensions of carbon nanotubes

A short review on regulation of stability of aqueous suspensions of carbon nanotubes

Carbon Nanotubes in Liquid Crystals: Fundamental Properties and Applications

Application of Synthetic Layered Sodium Silicate Magadiite Nanosheets for Environmental Remediation of Methylene Blue Dye in Water

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