Adsorption and desorption of atrazine on carbon nanotubes

Yan, Xiaomin; Shi, Baoyou; Lu, Jingyu; Feng, Chenghong; Wang, D.S.; Tang, Hongxiao

doi:10.1016/j.jcis.2008.01.047

Cited by 198 publications

(130 citation statements)

References 47 publications

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“…This theory would appear to be applicable in this case since MWCNTs form bundles in aqueous media and the spaces between the tubes within the bundles can be regarded as pores. Our data suggest that the PMM should be the recommended model for the adsorption of atrazine by MWCNTs as compared with other nonlinear models, such as Freundlich, Langmuir, dual-Langmuir and dual mode models [23,24].…”

Section: Sorption Isothermsmentioning

confidence: 85%

See 1 more Smart Citation

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

Chen

Shan

Zhou

et al. 2009

Journal of Hazardous Materials

139

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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: Sorption Isothermsmentioning

confidence: 85%

“…The adsorption of atrazine on MWCNTs was reported by Yan et al [23] and Chen et al [24]. They found Understanding of adsorption kinetics, thermodynamics and equilibrium is also critical for the design and operation of adsorption equipment.…”

Section: Introductionmentioning

confidence: 94%

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

Chen

Shan

Zhou

et al. 2009

Journal of Hazardous Materials

139

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“…The supernatants were withdrawn to determine the concentrations of atrazine by HPLC, details of which were described in a previous study. 23 The adsorbed atrazine was calculated by the difference in mass between the initial and the equilibrium solutions. Adsorption isotherms were fitted by Freundlich (FM), Langmuir (LM) and Polanyi-Manes models (PMM) (model formulas are listed in Table S4 of the SI).…”

Section: à20mentioning

confidence: 99%

Effect of Dispersion on Adsorption of Atrazine by Aqueous Suspensions of Fullerenes

Gai

Shi

Yan

et al. 2011

Environ. Sci. Technol.

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With the widespread application of fullerenes, it is critical to assess their environmental behaviors and their impacts on the transport and bioavailability of organic contaminants. The effects of fullerene particle size, chemistry of the solution, and natural organic matter on the adsorption of atrazine by aqueous dispersions of fullerenes (C60) were investigated in this work. The results showed that the Polanyi-Manes model could fit the adsorption isotherms well. Smaller sizes of fullerene particles led to increased available sites and, consequently, enhanced the adsorption of atrazine on C60. However, intensely dispersed C60 systems might not possess suitably high adsorptive capacities due to surface chemistry change. Adsorption of atrazine by aqueous dispersions of C60 increased with a decrease in the pH of the solution. Introduction of humic acid significantly reduced the size of the C60 particles, and resulted in the increase of the adsorption amount. Fullerene materials, once released into the aquatic environment, are inclined to form aqueous suspensions with different degrees of dispersion, which would greatly affect the transport and fate of organic contaminants.

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“…Many countries have set stringent regulations for atrazine levels in drinking water. In a previous study, we found that CNTs had a high capacity for atrazine adsorption and this adsorption was reversible (Yan et al, 2008). The main objective of the present study was to investigate the effect of CNT dispersion, induced by surfactant and NOM treatment, on the adsorption of atrazine.…”

Section: Introductionmentioning

confidence: 90%

Adsorption of atrazine by natural organic matter and surfactant dispersed carbon nanotubes

Shi

Zhuang

Yan

et al. 2010

Journal of Environmental Sciences

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The aggregation and dispersion behaviors of carbon nanotubes (CNTs) can regulate the environmental spread and fate of CNTs, as well as the organic pollutants adsorbed onto them. In this study, multi-walled carbon nanotubes (MWNTs) and single-walled carbon nanotubes (SWNTs) were surface modified with humic acids from different sources and with surfactants of different ionic types. The dispersion stability of surface modified CNTs was observed by UV-Vis spectrophotometry. The effect of humic acid and surfactant dispersion on the adsorption of atrazine by CNTs was investigated by batch equilibrium experiments. Both humic acid and surfactant could effectively disperse MWNTs, but not SWNTs, into stable suspensions under the studied conditions. Surface modified CNTs had a greatly reduced capacity for adsorption of atrazine. The inhibitory effect of peat humic acid was relatively stronger than that of soil humic acid, but the two surfactants had a similar inhibitory effect on atrazine adsorption by the two CNT types. Increases in surfactant concentration resulted in rapid decreases in the adsorption of atrazine by CNTs when the surfactant concentration was less than 0.5 critical micelle concentration.

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Adsorption and desorption of atrazine on carbon nanotubes

Cited by 198 publications

References 47 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

Effect of Dispersion on Adsorption of Atrazine by Aqueous Suspensions of Fullerenes

Adsorption of atrazine by natural organic matter and surfactant dispersed carbon nanotubes

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