Competitive adsorption of phenol and 3-chlorophenol on purified MWCNTs

Toth, András Jozsef; Törőcsik, Andrea; Tombácz, Etelka; László, Krisztina

doi:10.1016/j.jcis.2012.07.064

Cited by 35 publications

(12 citation statements)

References 28 publications

(45 reference statements)

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“…The electron density in the aromatic ring then decreases as the number of chlorine groups increases. On the other hand, the electron density in the aromatic ring of CP is lower than that of P. Therefore, the affinity of DCP to p electrons in MWCNTs surface is higher (Tóth et al 2012).…”

Section: Adsorption Equilibriummentioning

confidence: 93%

Influence of chlorine substitution on adsorption of gaseous chlorinated phenolics on multi-walled carbon nanotubes embedded in SiO2

Tulaphol

Bunsan²,

Kanchanatip

et al. 2016

Int. J. Environ. Sci. Technol.

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Multi-walled carbon nanotubes (MWCNTs) embedded in SiO 2 particles were prepared through the floating-catalyst chemical vapor deposition method. The parameters reaction time and flow rate of the carbon source (CH 4 ) were studied to obtain optimum conditions for MWCNT synthesis. The obtained MWCNTs were characterized by transmission electron microscopy, scanning electron microscopy, Raman spectroscopy, and Fourier transform infrared spectroscopy to confirm their morphology and crystallinity. The optimum conditions were a CH 4 flow rate of 100 ml/min in a H 2 -Ar mixture at a flow rate of 500 ml/min and a reaction time of 20 min. Under these conditions, MWCNTs with average outer and inner diameters of around 50 and 10 nm, respectively, were obtained. SiO 2 particles with embedded MWCNTs were studied for their adsorption of gaseous chlorinated phenolic compounds (CPCs), with emphasis on the effect of number of chlorine substituents. The CPC compounds of 2-chlorophenol (CP) and 2,4-dichlorophenol (DCP) were compared against phenol (P). Adsorption of P and CPCs on the particles fit well the Langmuir isotherm. The adsorption capacities of P, CP, and DCP on SiO 2 particles with embedded MWCNTs were found to be 3.12, 13.83, and 44.25 mg/g, respectively. Desorption activation energy was determined by thermogravimetric analysis. Chlorine substitution on P changed the adsorption process from physical to chemical adsorption. The particles showed high potential for use as a pre-concentration unit for solid-phase microextraction.

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Section: Adsorption Equilibriummentioning

confidence: 93%

Influence of chlorine substitution on adsorption of gaseous chlorinated phenolics on multi-walled carbon nanotubes embedded in SiO2

Tulaphol

Bunsan²,

Kanchanatip

et al. 2016

Int. J. Environ. Sci. Technol.

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“…The most popular and widely used adsorptive material is activated carbon [3][4][5][6]. In recent years, as an adsorbent for the removal of chlorophenols from water, carbon nanotubes (CNTs) [7][8][9][10][11][12][13] have also been studied.…”

Section: Introductionmentioning

confidence: 99%

Evaluation of different carbon materials in adsorption and solid-phase microextraction of 2,4,6-trichlorophenol from water

Kuśmierek¹,

Borucka²,

Świątkowski³

et al. 2019

Desalination and Water Treatment

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The adsorption process of 2,4,6-trichlorophenol (TCP) by carbonaceous materials, such as Carbopack B graphitized carbon black, Vulcan XC72 carbon black and two kinds of multi-walled carbon nanotubes, have been studied. The adsorption kinetics was best represented by the pseudo-second order kinetic model. Adsorption took place in accordance with the Freundlich equation. The materials were used to prepare novel, solid-phase microextraction (SPME) fibers. The efficiency of the fibers was evaluated using a gas chromatograph with an atomic emission detector for the extraction of TCP from the headspace of aqueous samples. Both the carbon nanotubes and carbon blacks coated fibers were of higher quality than commercially available fibers prepared from polydimethylsiloxane and polyacrylate. The results proved the ability of the proposed SPME fibers to detect TCP in water.

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“…As another group of common water pollutants, chlorophenols (CPs) can be found in wastewater from various industrial processes, such as tanning, manufacturing preservatives, pesticides, and so on [ 4 , 5 ]. They are listed as “priority toxic pollutants” by the US Environmental Protection Agency (EPA) due to their strong toxicity and poor biodegradability [ 6 , 7 ]. Therefore, substantial studies have been conducted to remove CPs from wastewater.…”

Section: Introductionmentioning

confidence: 99%

Magnetically Separable MoS2/Fe3O4/nZVI Nanocomposites for the Treatment of Wastewater Containing Cr(VI) and 4-Chlorophenol

Wang

Hao

et al. 2017

Nanomaterials

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With a large specific surface area, high reactivity, and excellent adsorption properties, nano zerovalent iron (nZVI) can degrade a wide variety of contaminants in wastewater. However, aggregation, oxidation, and separation issues greatly impede its wide application. In this study, MoS2/Fe3O4/nZVI nanocomposites were successfully synthesized by a facile step-by-step approach to overcome these problems. MoS2 nanosheets (MNs) acted as an efficient support for nZVI and enriched the organic pollutants nearby, leading to an enhanced removal efficiency. Fe3O4 nanoparticles (NPs) could not only suppress the agglomeration and restacking of MNs, but also facilitate easy separation and recovery of the nanocomposites. The synergistic effect between MNs and Fe3O4 NPs effectively enhanced the reactivity and efficiency of nZVI. In the system, Cr(VI) was reduced to Cr(III) by nZVI in the nanocomposites, and Fe2+ produced in the process was combined with H2O2 to further remove 4-Chlorophenol (4-CP) through a Fenton reaction. Furthermore, the nanocomposites could be easily separated from wastewater by a magnet and be reused for at least five consecutive runs, revealing good reusability. The results demonstrate that the novel nanocomposites are highly efficient and promising for the simultaneous removal of Cr(VI) and 4-CP in wastewater.

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Competitive adsorption of phenol and 3-chlorophenol on purified MWCNTs

Cited by 35 publications

References 28 publications

Influence of chlorine substitution on adsorption of gaseous chlorinated phenolics on multi-walled carbon nanotubes embedded in SiO2

Influence of chlorine substitution on adsorption of gaseous chlorinated phenolics on multi-walled carbon nanotubes embedded in SiO2

Evaluation of different carbon materials in adsorption and solid-phase microextraction of 2,4,6-trichlorophenol from water

Magnetically Separable MoS2/Fe3O4/nZVI Nanocomposites for the Treatment of Wastewater Containing Cr(VI) and 4-Chlorophenol

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