Sorption–desorption behaviour of 2,4-dichlorophenol by marine sediments

Fytianos, K.; Voudrias, Evangelos A.; Kokkalis, E.

doi:10.1016/s0045-6535(99)00214-3

Cited by 342 publications

(164 citation statements)

References 11 publications

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“…This plot gave a straight line with slope 1/n and a 0.999 R 2 value for crystal violet (Fig. 4) indicating that the adsorption of crystal violet follows the Freundlich isotherm (El-Sayed 2011;Fytianos, Voudrias, and Kokkalis 2000). The n F parameter, known as the heterogeneity factor, can be used to indicate whether the adsorption is linear (n F = 1), whether it is a chemical process (n F \ 1), or whether a physical process is favorable (n F [ 1).…”

Section: Isotherm Data Analysismentioning

confidence: 91%

“…The slope 1/n ranging between 0 and 1 is a measure of adsorption intensity or surface heterogeneity, becoming more heterogeneous as its value gets closer to zero (Haghseresht and Lu 1998). A value for 1/n below one indicates a normal Freundlich isotherm while 1/n above one is indicative of cooperative adsorption (Fytianos et al 2000). If the plot of ln q e versus ln C e gives straight line with slope 1/n, then it indicates that the adsorption of dye follows the Freundlich isotherm (Hameed et al 2007).…”

Section: Experimental Procedures and Adsorption Isothermsmentioning

confidence: 99%

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Removal of crystal violet and methylene blue from aqueous solutions by activated carbon prepared from Ferula orientalis

Aysu

Küçük

2014

Int. J. Environ. Sci. Technol.

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Ferula orientalis L. stalks were used as an agricultural solid biomass waste for preparation of activated carbon with zinc chloride activation using slow pyrolysis in a fixed-bed reactor. The chemical characteristics of the activated carbon obtained at 550°C were identified by elemental, fourier transform infrared spectroscopy, Brunauer-Emmett-Teller, scanning electron microscopy analyses and found to have a surface area of 1,476 m 2 /g. The ability of the activated carbon to adsorb methylene blue and crystal violet from aqueous solutions has been investigated. Adsorption studies were performed at different initial dye concentrations (200-800 ppm), contact time (0.5-90 min) and temperature (25-45°C). Adsorption data were modeled with Langmuir, Freundlich and Temkin adsorption isotherms. Equilibrium data of the adsorption processes showed that adsorption of methylene blue is fitted to the Langmuir and crystal violet to the Freundlich isotherm. Pseudo-first-order, pseudo-secondorder and Elovich kinetic models were used to analyze the kinetic data obtained at different initial dye concentrations. The adsorption kinetic data were very well described by the pseudo-second-order model. The calculated thermodynamic parameters such as change in free energy, enthalpy and entropy showed that adsorptions of both dyes onto activated carbon were spontaneous and endothermic under the experimental conditions.

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Section: Isotherm Data Analysismentioning

confidence: 91%

Section: Experimental Procedures and Adsorption Isothermsmentioning

confidence: 99%

Removal of crystal violet and methylene blue from aqueous solutions by activated carbon prepared from Ferula orientalis

Aysu

Küçük

2014

Int. J. Environ. Sci. Technol.

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show abstract

“…K f can be defined as the adsorption or distribution coefficient and represents the quantity of methylene blue onto SALCS for a unit equilibrium concentration. The slope 1/n ranging between 0 and 1 is a measure of absorption intensity or surface heterogeneity, becoming more heterogeneous as its, value gets closer to zero [38]. Value of 1/n below one indicates a normal Langmuir isotherm while above one is indicative of cooperative adsorption [39].…”

Section: Freundlich Isothermmentioning

confidence: 99%

Adsorption of Methylene Blue from Aqueous Solution Using Steam-Activated Carbon Produced from <i>Lantana camara</i> Stem

Amuda¹,

Olayiwola²,

Alade³

et al. 2014

JEP

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“…The values of 1/n, ranging from 0 to 1, is a measure of adsorption intensity or surface heterogeneity that becomes more heterogeneous as its value gets closer to zero (Ketcha et al 2007). A value for 1/n below 1 indicates a normal Langmuir adsorption isotherm, while 1/n above 1 is indicative of cooperative adsorption (Fytianos et al 2000;Abia and Asuquo 2006).…”

Section: Adsorption Isothermmentioning

confidence: 99%

Competitive adsorption of dye species from aqueous solution onto melon husk in single and ternary dye systems

Olajire

Giwa

Bello

2014

Int. J. Environ. Sci. Technol.

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Polluted water may contain more than one dye species. Consequently, the behavior of a particular dye in a water system may be affected by the presence of the others. In this study, the adsorption of methylene blue (MB) in single dye system (SDS) and in ternary dye system (TDS) comprising of MB, congo red and methyl orange onto formaldehyde-treated melon husk (FMH) was investigated as a function of pH, contact time and species concentrations. Surface studies of FMH were investigated by Fourier transform infrared and scanning electron microscopy. The dye species adsorption equilibria were rapidly attained after 60 (SDS) and 90 min (TDS) of contact times. The adsorption kinetics were analyzed using pseudo first-order, pseudo second-order and intraparticle diffusion models and the adsorption data were well described by the pseudo second-order model. The equilibrium adsorption data were interpreted in terms of the Langmuir, Freundlich, Temkin, Dubinin-Radushkevich, Harkin-Jura and Halsey isotherm models and the goodness of fittings were inspected using linear regression analysis (R 2 ). Our results indicated that the Langmuir model was best fitted, suggesting monolayer adsorption. Thermodynamic study showed that the adsorptions in SDS and TDS on FMH are favourable. The change in entropy (DS°) and heat of adsorption (DH°) of dye species on FMH in TDS were estimated as 82.2 J/ mol K and 17.95 kJ/mol. respectively while in SDS, they were respectively -43.76 J/mol K and -21.84 kJ/mol. The sorption process in both systems was thermodynamically feasible with negative DG°values.

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Sorption–desorption behaviour of 2,4-dichlorophenol by marine sediments

Cited by 342 publications

References 11 publications

Removal of crystal violet and methylene blue from aqueous solutions by activated carbon prepared from Ferula orientalis

Removal of crystal violet and methylene blue from aqueous solutions by activated carbon prepared from Ferula orientalis

Adsorption of Methylene Blue from Aqueous Solution Using Steam-Activated Carbon Produced from <i>Lantana camara</i> Stem

Competitive adsorption of dye species from aqueous solution onto melon husk in single and ternary dye systems

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Sorption–desorption behaviour of 2,4-dichlorophenol by marine sediments

Cited by 342 publications

References 11 publications

Removal of crystal violet and methylene blue from aqueous solutions by activated carbon prepared from Ferula orientalis

Removal of crystal violet and methylene blue from aqueous solutions by activated carbon prepared from Ferula orientalis

Adsorption of Methylene Blue from Aqueous Solution Using Steam-Activated Carbon Produced from &lt;i&gt;Lantana camara&lt;/i&gt; Stem

Competitive adsorption of dye species from aqueous solution onto melon husk in single and ternary dye systems

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Adsorption of Methylene Blue from Aqueous Solution Using Steam-Activated Carbon Produced from <i>Lantana camara</i> Stem