Adsorption of Acid Red 57 from aqueous solutions onto surfactant-modified sepiolite

Özcan, Adnan

doi:10.1016/j.jhazmat.2005.05.039

Cited by 315 publications

(129 citation statements)

References 39 publications

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“…If the regression of q t versus t 1/2 is linear and passes through the origin, then intraparticle diffusion is the sole rate-limiting step [34,35]. In our study although the regression was linear, the plot did not pass through the origin (Fig.…”

Section: Adsorption Kineticsmentioning

confidence: 50%

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: Adsorption Kineticsmentioning

confidence: 50%

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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“…Singh and Rawat (1994) reported that the adsorption process includes the transport of adsorbate molecules from bulk solution to the interior surface of the pores. The applicability of intra-particle diffusion was investigated using intra-particle diffusion model (Ozcan and Ozcan 2005;Weber and Morris 1963).…”

Section: Adsorption Isothermsmentioning

confidence: 99%

Adsorption of anionic azo dye from aqueous solution using Strychnos potatorum Linn seeds: isotherm and kinetic studies

Sankar¹,

Kumar²,

Ranganathan³

2014

Int. J. Environ. Sci. Technol.

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Dyes from several industry effluents are major concern of environmental pollution. In this study, the efficiency of a cost-effective natural adsorbent Strychnos potatorum Linn (Fam: Loganiaceae) seeds on removing reactive orange-M2R dye from aqueous solution was investigated using batch adsorption isotherms at 30 ± 1°C and 120 rpm. The efficacy of the adsorbent system was also studied at various parameters viz. contact time, pH, adsorbent dosage and initial dye concentration. Maximum adsorption (q e = 9 mg/g) was observed at pH 2.0, equilibrium time 6 h, initial dye concentration of 100 mg/L and adsorbent dosage of 0.2 g/100 mL. The unit adsorption of dye, q e (mg/g) increased with increase in contact time and initial dye concentration, while it decreased with increase in adsorbent dosage. The adsorption kinetic studies revealed that it follows pseudo-second-order reaction model. Equilibrium adsorption data followed both Langmuir and Freundlich isotherms with good agreement. These investigations suggest that Strychnos potatorum Linn seeds (SPS) could be used as a low-cost adsorbent in treating textile effluents for dye removal applications. The adsorbent (SPS) was also characterized using Fourier transform infrared spectroscopy, powder X-ray diffraction, and scanning electron microscopic technique.

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“…Intraparticle diffusion is the sole rate-limiting step if the plot of q t versus t 1/2 is linear and passes through the origin (Ozcan and Ozcan 2005). Figure 3 presents a plot of the CR adsorption density (mg/g) as a function of t 1/2 at an initial dye concentration of 100 mg/L and at different temperatures.…”

Section: Adsorption Kineticsmentioning

confidence: 99%

Characteristics, kinetics and thermodynamics of Congo Red biosorption by activated sulfidogenic sludge from an aqueous solution

Rasool

Lee

2013

Int. J. Environ. Sci. Technol.

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The kinetics and thermodynamics of the biosorption of textile dye Congo Red on anaerobic activated sulfidogenic sludge were examined. The influence of different adsorption parameters such as pH, temperature, contact time and initial dye concentrations on the biosorption capacity was also investigated. The sulfidogenic sludge showed a maximum biosorption density of 238.90 mg dye/g cell for Congo Red at an initial dye concentration of 1,000 mg/L, pH 3.5 and 22°C, which is higher than that of many other adsorbents reported in the literature. The biosorption processes obeyed the Langmuir isotherm and exhibited pseudo-second-order rate kinetics. The thermodynamic parameters indicated the spontaneous and exothermic nature of Congo Red biosorption. The Fourier transform infrared spectra revealed the dye interaction with the biomass. Scanning electron microscopy showed significant changes in the surface morphology of the sludge after dye biosorption. These results showed that sulfidogenic sludge biomass is an attractive alternative low-cost biosorbent for the removal of the dye from aqueous media.

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Adsorption of Acid Red 57 from aqueous solutions onto surfactant-modified sepiolite

Cited by 315 publications

References 39 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

Adsorption of anionic azo dye from aqueous solution using Strychnos potatorum Linn seeds: isotherm and kinetic studies

Characteristics, kinetics and thermodynamics of Congo Red biosorption by activated sulfidogenic sludge from an aqueous solution

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