Adsorption of o-xylene and p-xylene from water by SWCNTs

Chin, Ching Ju Monica; Shih, Li Chieh; Tsai, Hen Je; Liu, Ta Kang

doi:10.1016/j.carbon.2007.01.015

Cited by 115 publications

(68 citation statements)

References 14 publications

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“…The adsorption of organic contaminants on MWCNTs has been studied extensively [14][15][16][17][18][19][20][21][22]. The adsorption of atrazine on MWCNTs was reported by Yan et al [23] and Chen et al [24].…”

Section: Introductionmentioning

confidence: 99%

“…CNTs have been considered useful in pollution prevention strategies and are known to have widespread applications as environmental adsorbents and high flux membranes [13], and are also potentially important for in situ environmental remediation due to their unique properties and high reactivity [14]. Investigations dealing with the sorption of organic contaminants, such as dioxin [15], 1,2-dichlorobenzene [16], trihalomethanes [17], PAHs [18] and o-xylene, p-xylene [19] and reactive dyes [20] on CNTs suggest that CNTs may also be suitable candidates for the pre-concentration and solidification of pollutants from large volumes of wastewater. Strong adsorptive interaction between CNTs and polycyclic aromatic hydrocarbons were ascribed to -electron-donor-acceptor (EDA) interactions between aromatic molecules (electron acceptors) and the highly polarizable graphene sheets (electron donors) of CNTs [18,21].…”

Section: Introductionmentioning

confidence: 99%

“…Strong adsorptive interaction between CNTs and polycyclic aromatic hydrocarbons were ascribed to -electron-donor-acceptor (EDA) interactions between aromatic molecules (electron acceptors) and the highly polarizable graphene sheets (electron donors) of CNTs [18,21]. In addition, hydrophobic effect, dispersion and weak dipolar forces as well as micropore diffusion are also considered to be responsible for adsorption [18,19,22].…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Adsorption kinetics, isotherms and thermodynamics of atrazine on surface oxidized multiwalled carbon nanotubes

Chen

Shan

Zhou

et al. 2009

Journal of Hazardous Materials

143

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a b s t r a c tThe adsorption kinetics, isotherms and thermodynamic of atrazine on multiwalled carbon nanotubes (MWCNTs) containing 0.85%, 2.16%, and 7.07% oxygen was studied. Kinetic analyses were performed using pseudo-first-order, pseudo-second-order and intraparticle diffusion models. The regression results showed that the pseudo-second-order law fit the adsorption kinetics. The calculated thermodynamic parameters indicated that adsorption of atrazine on MWCNTs was spontaneous and exothermic. Standard free energy ( G 0 ) became less negative when the oxygen content of MWCNTs increased from 0.85% to 7.07% which is consistent with the low adsorption affinity of MWCNTs for atrazine.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Adsorption kinetics, isotherms and thermodynamics of atrazine on surface oxidized multiwalled carbon nanotubes

Chen

Shan

Zhou

et al. 2009

Journal of Hazardous Materials

143

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“…To modify CNTs can improve the mechanical properties of nanocomposites. There are various modification methods for CNTs that have been reported, such as microwave-assisted heating, thermal oxidation, and chemical oxidation (Chin et al, 2007). Among them, chemical oxidation is frequently used, including nitric acid (HNO 3 ), hydrogen peroxide (H 2 O 2 ), mixture of H 2 O 2 and hydrochloric acid (HCl) or a mixture of sulfuric acid (H 2 SO 4 ) and HNO 3 (Hou et al, 2008).…”

Section: Introductionmentioning

confidence: 99%

Thermal Analysis of Multi-walled Carbon Nanotubes by Kissinger’s Corrected Kinetic Equation

Hsieh

Chou

Lin

et al. 2010

Aerosol Air Qual. Res.

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Carbon nanotubes (CNTs) have been a popular material in recent years, but their thermal characteristics have not been understood completely. We investigated the unique thermal stability of multi-walled carbon nanotubes (MWCNTs) and used nitric acid (HNO 3 ) to purify MWCNTs to promote its activation energy (E a ). The study used differential scanning calorimetry (DSC), thermogravimetric analyzer (TGA), and Fourier transform infrared (FTIR) spectrometer to analyze as-grown MWCNTs and modified MWCNTs. For DSC, the heating rate was chosen to be 0.25 to 2.0 °C/min. From DSC results, E a and exothermic onset temperature (T 0 ) of the modified MWCNTs increased with increasing HNO 3 concentration. The TGA results showed that both as-grown and modified MWCNTs' decomposition temperatures were higher than 500°C in air. The infrared spectra of as-grown MWCNTs and modified MWCNTs have shown that the gas phase composition is CO 2 after TGA linked with FTIR. By Kissinger's corrected kinetic equation, E a increased with increasing HNO 3 concentration. Through this study, we realized that as-grown MWCNTs and modified MWCNTs are thermally hazardous materials with high potential heat of decomposition, especially under fire exposure. Thus, it is important to know the thermal hazard characteristics of material with a measure to prevent its thermal damage during perturbed situations.

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“…Carbon nanotubes (CNTs) have been increasingly applied in the environmental protection as novel materials due to their strong adsorption affinity for both heavy metals and organic chemicals [8][9][10][11][12][13][14][15]. CNTs are considered a superior adsorbent for potential environmental remediation due to their large surface area and high reactivity [16][17][18][19].…”

Section: Introductionmentioning

confidence: 99%

Adsorption of diuron and dichlobenil on multiwalled carbon nanotubes as affected by lead

Chen

Shan

Pei

et al. 2011

Journal of Hazardous Materials

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a b s t r a c tThe effect of lead on the adsorption of diuron and dichlobenil on multiwalled carbon nanotubes (MWCNTs) was investigated to explore the possible application of MWCNTs for removal of both herbicides from contaminated water. The adsorption of diuron and dichlobenil on MWCNTs at pH 6 was nonlinear and fit the Polanyi-Manes model well. The adsorption of diuron and dichlobenil was closely correlated with specific surface areas and micropore volumes of MWCNTs. An increase in oxygen content of MWCNTs with same diameters and similar surface areas decreased the adsorption of diuron and dichlobenil, while increased the adsorption of lead. Micro-Fourier transform infrared spectroscopic study indicated that hydrogen bonding is a main mechanism responsible for the adsorption of diuron or dichlobenil onto MWCNTs-O. Oxygen containing groups, mainly carboxylic groups, significantly increased the adsorption of lead through the formations of outer-sphere and inner-sphere complexes, which are verified by X-ray absorption spectroscopic measurements. Oxygen containing groups and the presence of lead diminished the adsorption of diuron and dichlobenil. The suppression mechanisms of lead were ascribed to hydration and complexation of lead with carboxylic groups, which may occupy part of surface of MWCNTs-O. The large hydration shell of lead cations may intrude or shield hydrophobic and hydrophilic sites, resulting in a decreased adsorption of diuron and dichlobenil at the lead-complexed moieties.

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Adsorption of o-xylene and p-xylene from water by SWCNTs

Cited by 115 publications

References 14 publications

Adsorption kinetics, isotherms and thermodynamics of atrazine on surface oxidized multiwalled carbon nanotubes

Adsorption kinetics, isotherms and thermodynamics of atrazine on surface oxidized multiwalled carbon nanotubes

Thermal Analysis of Multi-walled Carbon Nanotubes by Kissinger’s Corrected Kinetic Equation

Adsorption of diuron and dichlobenil on multiwalled carbon nanotubes as affected by lead

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