Removal of 2,4-dichlorophenoxyacetic acid from aqueous solutions by partially characterized organophilic sepiolite: thermodynamic and kinetic calculations

Akçay, Gülten; Akçay, Mehmet; Yurdakoç, Kadir

doi:10.1016/j.jcis.2004.08.080

Cited by 46 publications

(39 citation statements)

References 28 publications

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“…Similar values have been reported for the adsorption of atrazine on soils [20] and adsorption of 2,4-D (2,4-dichlorophenoxyacetic acid) onto organophilic sepiolite [21].…”

Section: Langmuir Constants Freundlich Constantssupporting

confidence: 85%

“…However, in all cases, it was noted that the adsorption of 2,4-D was a spontaneous process. The positive values of the enthalpy change could suggest the adsorption process is endothermic, a phenomenon that was observed by Akçay et al [21] and Aksu and Kabasakal [6]. Bhattacharyya and Sharma [22] reported that such small values in enthalpy change are not consistent with the formation of strong chemical bonds between the adsorbent and the adsorbate.…”

Section: Langmuir Constants Freundlich Constantsmentioning

confidence: 90%

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Adsorption of Atrazine and Simazine from Aqueous Solutions onto Poly(ε‐Caprolactone)

Övez¹,

Höll

2008

CLEAN Soil Air Water

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The biodegradable synthetic polymer poly(e-caprolactone) was investigated as a substrate for denitrification. This substrate may also act as an adsorbent for two pesticides, i. e., atrazine and simazine, from water. The equilibrium was studied at 25, 35 and 458C. The results were correlated using the Langmuir and Freundlich adsorption models. The total capacities of the adsorbent were defined from experimental data for atrazine (10.98 mg g -1 ) and simazine (27.54 mg g -1 ). The effect of temperature on the model constants and the thermodynamics of adsorption were investigated. The evaluation of the development of adsorption was achieved by assuming a pseudo-second order chemical reaction.

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“…Similar values have been reported for the adsorption of atrazine on soils [20] and adsorption of 2,4-D (2,4-dichlorophenoxyacetic acid) onto organophilic sepiolite [21].…”

Section: Langmuir Constants Freundlich Constantssupporting

confidence: 85%

Section: Langmuir Constants Freundlich Constantsmentioning

confidence: 90%

Adsorption of Atrazine and Simazine from Aqueous Solutions onto Poly(ε‐Caprolactone)

Övez¹,

Höll

2008

CLEAN Soil Air Water

View full text Add to dashboard Cite

show abstract

“…Also, adsorption process is one of the most promising techniques for pesticide removal due to flexibility in design and operation. Batch and/or column experiments have been undertaken to study adsorption characteristics of some pesticides such as (2,4-dichlorophenoxy) propionic acid (dichlorprop), (4-chloro-2-methylphenoxy) propanoic acid (mecoprop) (27), 2,4-dichlorophenol (DCP), 2-methyl-4-chlorophenol (MCP) (27,28), atrazine (29), carbofuran (30), and 2,4-D (21,27,(29)(30)(31)(32)(33). Choosing of a suitable adsorbent for pesticide removal is a complex problem because of the wide variety of their chemical structures.…”

Section: Introductionmentioning

confidence: 99%

Removal of 2, 4-Dichlorophenoxyacetic Acid (2, 4-D) From Aqueous Environments Using Single-Walled Carbon Nanotubes

et al. 2013

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Background: 2, 4-Dichlorophenoxyacetic acid (2, 4-D) is a widely used herbicide known to be moderately toxic. Extensive use and poor biodegradability of 2, 4-D has resulted in its ubiquitous presence in the environment, and has led to contamination of surface and ground waters. Objectives: At present study, single-walled carbon nanotubes (SWCNTs) were used for the sorption of 2, 4-D from aqueous solutions. Materials and Methods: The effect of various operating parameters such as initial concentration of 2, 4-D, contact time, adsorbent dosage, and pH were investigated. Equilibrium isotherms were used to identify the possible mechanism of the adsorption process. Results: Maximum adsorption capacity of the SWCNTs was 979.6 mg/g at pH5, contact time 45 min, initial concentration of 5000 µg/L, and 23 ± 2 •C temperatures, when 97.96% of 2, 4-D herbicide were removed. The adsorption equilibriums were analyzed by Langmuir and Freundlich isotherm models. It was found that the data fitted to Langmuir (R2 = 0.9987) better than Freundlich (R2 = 0.9727) model. Conclusions: According to achieved results, it was defined that SWCNTs is a quite effective adsorbent in removal of 2, 4-D from aqueous environments.

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“…Akçay [9] studied the adsorptive properties of montmorillonite clay modified by tetra-butyl ammonium. The adsorption isotherms were adjusted according to the models of Freundlich and Dubinin-Radushkevich.…”

mentioning

confidence: 99%

“…Some adsorptive kinetic models have been used in different researches projected, employing the Lagergren models, also called models of pseudo-first-order and pseudo-second-order, [9,10] represented by Equations (5) and (6):…”

mentioning

confidence: 99%

Phenol adsorption by modified clay from Northeastern Brazil

et al. 2013

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This research had as objective the use of an adsorbent organoclay to remove the phenol compound, found on a large scale in aqueous effluents of petrochemical industries. The particular clay studied, called 'Chocolate,' originated in the Northeast Region of Brazil, from Campina Grande, Paraíba. Initially the clay sample was treated with sodium carbonate in an aqueous suspension, according to an experimental design (with the variables, sodium concentration, contact time and system temperature). The sodium-containing clay was then treated with a quaternary ammonium salt solution. The adsorption capacity of phenol in this organoclay was estimated using the Langmuir-Freundlich Equation. The adsorptive efficiency, for the best conditions, was approximately 80% of phenol removed from the aqueous phase. The experimental data was fitted to a pseudo-second-order kinetic model. X-ray diffraction results showed that the basal spacing of natural Chocolate clay and organophilic Chocolate clay were 1.549 and 2.092 nm, respectively. The maximum adsorption capacity, with experiments at pH 8.3, at room temperature (27°C), was equal to 12.287 mg g À1.

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Removal of 2,4-dichlorophenoxyacetic acid from aqueous solutions by partially characterized organophilic sepiolite: thermodynamic and kinetic calculations

Cited by 46 publications

References 28 publications

Adsorption of Atrazine and Simazine from Aqueous Solutions onto Poly(ε‐Caprolactone)

Adsorption of Atrazine and Simazine from Aqueous Solutions onto Poly(ε‐Caprolactone)

Removal of 2, 4-Dichlorophenoxyacetic Acid (2, 4-D) From Aqueous Environments Using Single-Walled Carbon Nanotubes

Phenol adsorption by modified clay from Northeastern Brazil

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