Interaction of phenol and dopamine with commercial MWCNTs

Toth, András Jozsef; Törőcsik, Andrea; Tombácz, Etelka; Oláh, Erzsébet; Heggen, Marc; Li, Chengliang; Klumpp, Erwin; Geissler, Erik; László, Krisztina

doi:10.1016/j.jcis.2011.08.044

Cited by 18 publications

(19 citation statements)

References 42 publications

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“…The outstanding mechanical and conductive properties of carbon nanoparticles (CNPs), together with their unique structure and low density, place them among the most common fillers. Carbon nanofiber and carbon nanotubes (CNT) [14][15][16][17][18][19][20] 1,2 , N. Miklósi 1 and its derivatives [21][22][23][24], mainly graphene oxide (GO), have attracted marked interest in the last few years. In biomedical applications, however, the uncertainty surrounding the toxicity of CNTs [14] could affect choices of nanocarbon filler.…”

Section: Introductionmentioning

confidence: 99%

Thermal sensitivity of carbon nanotube and graphene oxide containing responsive hydrogels

Manek

Berke

Miklósi

et al. 2016

Express Polym. Lett.

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Abstract.Comparative investigations are reported on poly(N-isopropylacrylamide) (PNIPA) gels of various carbon nanotube (CNT) and graphene oxide (GO) contents synthesized under identical conditions. The kind and concentration of the incorporated carbon nanoparticles (CNPs) influence the swelling and stress-strain behaviour of the composites. Practically independently of the filler content, incorporation of CNPs appreciably improves the fracture stress properties of the gels. The time constant and the swelling ratio of the shrinkage following an abrupt increase in temperature of the swelling medium from 20 to 50°C can be adjusted by selecting both the type and the amount of nanoparticle loading. This offers a means of accurately controlling the deswelling kinetics of drug release with PNIPA systems, and could be employed in sensor applications where fast and excessive shrinkage are a significant drawback. Both CNTs and GO enhance the infrared sensitivity of the PNIPA gel, thus opening a route for the design of novel drug transport and actuator systems. It is proposed that the influence of the CNPs depends more on their surface reactivity during the gel synthesis rather than on their morphology. One of the important findings of this study is the existence of a thermally conducting network in the GO filled gels.

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Section: Introductionmentioning

confidence: 99%

Thermal sensitivity of carbon nanotube and graphene oxide containing responsive hydrogels

Manek

Berke

Miklósi

et al. 2016

Express Polym. Lett.

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“…Details of the titration in the case of CNTs are described elsewhere [22]. The initial (immersion) pH of the potentiometric titration is used to characterize the behaviour of the carbon nanotubes in aqueous solution.…”

Section: Acid-base Properties In Aqueous Solutionmentioning

confidence: 99%

“…It should be noted, however, that the surface area available for the molecules in the liquid phase may be different from S BET due to i) the kinetic conditions (77 K vs. 293 K) and ii) the different cross sectional area of the molecules. The accessibility of the inner borehole during the shaking is to be considered as well [22]. Comparison of the surface area related n m values reveals that the surface coverage by phenol is very similar, 19% and…”

Section: Characterisation Of the Materialsmentioning

confidence: 99%

Competitive adsorption of phenol and 3-chlorophenol on purified MWCNTs

Toth

Törőcsik

Tombácz

et al. 2012

Journal of Colloid and Interface Science

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A commercial multiwall carbon nanotube and its carboxylated derivate (CNTC and COOHC, respectively) was used after purification to study the competitive adsorption of phenol (P) and m-chlorophenol (CP) from 0.1 M aqueous NaCl solutions without external pH control. The adsorption takes place practically exclusively on the external surface of the nanotubes. The uptake of P is suppressed in comparison to its single solute behaviour on both nanotubes, independently of the initial pollutant concentration. The uptake of CP however is more sensitive to the concentration and the surface chemistry of the nanotube. The measured coadsorption isotherms were compared to the isotherms calculated from the competitive Langmuir model (CLM). Preferential adsorption of CP was observed in about 95 % of the relative concentration range. The total adsorption may exceed the corresponding single component sorption capacity.

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“…New materials such as multiwalled carbon nanotubes (MWCNTs) also have the potential for effective removal of organic compounds like phenol, chlorophenols, nitroaromatic compounds, etc. (Sheng et al 2010;Shen et al 2009;Arasteh et al 2010;Abdel Salam et al 2010;Ji et al 2010;Liao et al 2008;Tóth et al 2011;Wiśniewski et al 2012;Li et al 2013). However the relatively large surface area and the high sorption capacity of MWCNTs are compromised by their strong hydrophobic character, which results in self assembled aggregates.…”

Section: Introductionmentioning

confidence: 99%

Heterogeneity of multiwalled carbon nanotubes based on adsorption of simple aromatic compounds from aqueous solutions

et al. 2014

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The surface heterogeneity of multiwalled carbon nanotubes (MWCNTs) is studied on the basis of adsorption isotherms from dilute aqueous phenol and dopamine solutions at various pH values. The generalized Langmuir-Freundlich (GLF) isotherm equation was applied to investigate the cooperative effect of the surface heterogeneity and the lateral interactions between the adsorbates. The theoretical isosteric heats of adsorption were obtained assuming that the heat of adsorption profile reveals both the energetic heterogeneity of the adsorption system and the strength of the interactions between the neighboring molecules. The adsorption energy distribution (AED) functions were calculated by using algorithm based on a regularization method. The great advantage of this method is that the regularization makes no assumption about the shape of the obtained energy distribution functions. Analysis of the isosteric heats of adsorption for MWCNTs showed that the influence of the surface heterogeneity is much stronger than the role of the lateral interactions. The most typical adsorption heat is 20-22 kJ/mol for both phenol and dopamine. After purification of nanotubes, heat value for phenol dropped to 16-17 kJ/mol. The range of the energy distribution is only slightly influenced by the surface chemistry of the nanotubes in the aqueous conditions.

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Interaction of phenol and dopamine with commercial MWCNTs

Cited by 18 publications

References 42 publications

Thermal sensitivity of carbon nanotube and graphene oxide containing responsive hydrogels

Thermal sensitivity of carbon nanotube and graphene oxide containing responsive hydrogels

Competitive adsorption of phenol and 3-chlorophenol on purified MWCNTs

Heterogeneity of multiwalled carbon nanotubes based on adsorption of simple aromatic compounds from aqueous solutions

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