Mechanism of Methylene Blue adsorption on hybrid laponite-multi-walled carbon nanotube particles

Manilo, Maryna; Lebovka, Nikolaï; Bárány, Sándor

doi:10.1016/j.jes.2015.06.011

Cited by 20 publications

(12 citation statements)

References 35 publications

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“…The presence of these stages was explained accounting for different types of interactions between MB and hybrids, as well as for the changes in the structure of aggregates and the long-range restructuring of Lap platelets on the surface of MWCNTs. The analysis of the adsorption data of MB by MWCNT + Lap hybrid particles evidenced in favor of the model with linear contacts between rigid Lap platelets and MWCNTs [44].…”

Section: Adsorptive Properties Of Cntsmentioning

confidence: 88%

“…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%

“…MWCNT + Lap hybrids can be also effectively used for removal of MB from aqueous systems. Adsorption of MB on MWCNT + Lap and dead-end membrane have been studied [42,44]. The size and the shape of hybrid particles were determined by nanotubes, whereas the adsorption properties were determined by Lap particles attached to the surface of nanotubes.…”

Section: Adsorptive Properties Of Cntsmentioning

confidence: 99%

“…10 15 m/kg. The kinetics of adsorption and parameters of equilibrium adsorption of MB on MWCNT + Lap hybrids have been also investigated in detail [44]. For elucidation of the mechanism of MB adsorption, the electrical conductivity and ζ-potential were measured [42,44].…”

Section: Adsorptive Properties Of Cntsmentioning

confidence: 99%

“…The kinetics of adsorption and parameters of equilibrium adsorption of MB on MWCNT + Lap hybrids have been also investigated in detail [44]. For elucidation of the mechanism of MB adsorption, the electrical conductivity and ζ-potential were measured [42,44]. Three different stages in the kinetics of adsorption were observed: a fast initial stage I (t = 0-10 min), a slower intermediate stage II (up to t  120 min) and a long-lasting final stage III (up to t  24 h).…”

Section: Adsorptive Properties Of Cntsmentioning

confidence: 99%

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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: Adsorptive Properties Of Cntsmentioning

confidence: 88%

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

confidence: 99%

Section: Adsorptive Properties Of Cntsmentioning

confidence: 99%

Section: Adsorptive Properties Of Cntsmentioning

confidence: 99%

Section: Adsorptive Properties Of Cntsmentioning

confidence: 99%

See 3 more Smart Citations

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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Additive Influence on Binder Migration in Electrode Drying

Burger,

Klemens,

Keim

et al. 2024

Energy Tech

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Two main goals for the industrial, slurry‐based electrode processing are a high process speed and the maximum possible material efficiency. This makes an increased drying rate and active material share favorable, but both are limited by adverse effects on the electrode quality. The adverse effects of fast drying are associated with the migration of binder. In this article, the slurry properties of water‐based graphite slurries are manipulated using a synthetic, layered silicate as additive. The influence of the polymer‐particle composite network on the viscosity, adhesion strength, and cell performance is investigated. By addition of a small amount of additive (0.5 wt% of the dry electrode), the binder migration is mitigated up to a drying rate of 6 g m−2 s−1 for graphite anodes with ≈4.2 mAh cm−2 (corresponding with 30 s drying time) leading to a possible increase of eight times the process speed compared to drying with 0.75 g m−2 s−1 if adverse effects on the tortuosity of the electrodes can be solved. In this work, a combination of additive usage is pointed out with a multilayer approach and first insights are provided in how the binder migration may be mitigated to gain structurally optimized fast‐dried electrodes without losses in electrode quality.

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Controllable synthesis and adsorption mechanism of flower-like MoS2/g-C3N4 nanocomposites for the removal of methylene blue in water

et al. 2022

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The fabrication and adsorption mechanism of ower-like MoS 2 /g-C 3 N 4 nanocomposites as new adsorbent materials were investigated by batch sorption experiments in this paper. The in uence of factors such as pH, adsorbent dosage, concentration and temperature on the adsorption properties of ower-like MoS 2 /g-C 3 N 4 nanocomposites were studied in detailed. The adsorption isotherm data was tted with the Langmuir model, and the adsorption kinetic characteristics conform to the quasi secondorder kinetic equation. Thermodynamic data showed that the adsorption process of methylene blue (MB) was feasible, endothermic and spontaneous. At 45 ℃, the maximum adsorption capacity was 278.4 mg/g. The adsorbed MB solution was used to water the wheat and chickpea plants within 15 days.Compared with MB solution, the treated MB solution made the plants grow much more better.

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Mechanism of Methylene Blue adsorption on hybrid laponite-multi-walled carbon nanotube particles

Cited by 20 publications

References 35 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

Additive Influence on Binder Migration in Electrode Drying

Controllable synthesis and adsorption mechanism of flower-like MoS2/g-C3N4 nanocomposites for the removal of methylene blue in water

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