Adsorption of dyes on Sahara desert sand

Varlıklı, Canan; Bekiari, Vlasoula; Kuş, Mahmut; Boduroglu, Numan; Öner, Ilker; Lianos, Panagiotis; Lyberatos, Gérasimos; İçli, Sıddık

doi:10.1016/j.jhazmat.2009.05.030

Cited by 71 publications

(40 citation statements)

References 31 publications

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“…These results indicate that the boundary layer resistance may control the dye sorption process. These results indicate that the intraparticle diffusion was not the only rate-limiting step and other processes may affect the dye adsorption process onto the fabricated nanofibers [25]. This table shows that the correlation coefficient values R 2 for the different studied dye concentrations are close to 1 and their values are larger than the comparable correlation coefficients derived from the pseudo-first-order kinetic model.…”

Section: Kinetic Modeling Of Dye Sorption Process Onto Fabricated Funmentioning

confidence: 64%

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Adsorption Profile of Basic Dye onto Novel Fabricated Carboxylated Functionalized Co-Polymer Nanofibers

2016

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Acrylonitrile-Styrene co-polymer was prepared by solution polymerization and fabricated into nanofibers using the electrospinning technique. The nanofiber polarization was enhanced through its surface functionalization with carboxylic acid groups by simple chemical modification. The carboxylic groups' presence was dedicated using the FT-IR technique. SEM showed that the nanofiber attains a uniform and porous structure. The equilibrium and kinetic behaviors of basic violet 14 dye sorption onto the nanofibers were examined. Both Langmuir and Temkin models are capable of expressing the dye sorption process at equilibrium. The intraparticle diffusion and Boyd kinetic models specified that the intraparticle diffusion step was the main decolorization rate controlling the process.

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Section: Kinetic Modeling Of Dye Sorption Process Onto Fabricated Funmentioning

confidence: 64%

Section: Kinetic Modeling Of Dye Sorption Process Onto Fabricated Funmentioning

confidence: 82%

Adsorption Profile of Basic Dye onto Novel Fabricated Carboxylated Functionalized Co-Polymer Nanofibers

2016

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“…The positive values of ∆H (15.7 and 25.3 kJ/mol for BB and BR) illustrate the endothermic nature of cationic dye adsorption [26]. The negative values of ∆S for the two dyes indicate that the two systems have decreased randomness at the solid-solution interface [28]. The increasing value of ∆G with increasing temperature suggests that lower temperatures facilitate adsorption [29].…”

Section: Thermodynamic Parametersmentioning

confidence: 96%

Adsorption Capability of Ionic Dyes onto Pristine and Calcined Activated Clay

Ogata

Ueta

Kawasaki

2016

e-J. Surf. Sci. Nanotech.

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In this study, pristine and calcined activated clay (AC) were characterized by scanning electron microscopy, X-ray diffraction analysis, thermogravimetric-differential thermal analysis, electron probe microanalysis, surface pH measurement, specific surface area measurement, and humidity adjustment. ACs were used as adsorbents for investigating the adsorption kinetics, isotherms, thermodynamic parameters, of Basic Red 46 (BR), Basic Blue 75 (BB), Acid Red 138 (AR), and Acid Blue 185 (AB) in aqueous solutions, as well as the effect of sodium hydroxide on these dyes. The results showed that adsorption of cationic and anionic dyes was related to the specific surface area (0.974-0.984) and humidity adjustment performance (0.939-1.000), respectively. The adsorption capacity of the cationic dyes (BB and BR) onto pristine AC increased on increasing the temperature. Equilibrium data using pristine AC fitted well to both the Langmuir and Freundlich isotherm models. Kinetic data were best described by the pseudo-second order model (correlation coefficient was 0.979-0.999 and 0.945-0.999 for BB and BR). Nearly 8 h of contact time was sufficient for the adsorption of cationic dyes to reach equilibrium. Thermodynamic parameters were also evaluated for the cationic dye-adsorbent system, which revealed that the adsorption process is endothermic in nature. These results demonstrated that pristine AC could be used as a natural adsorbent for the removal of cationic dyes (BB and BR) from aqueous solution.

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“…This decrease in adsorption capacity could be explained by , agitation speed 300 rpm, temperature 293 K, ionic strength 0 mol L -1 NaCl, solution pH: 4.0). unsaturated contaminant sorption sites during the sorption process (Varlikli et al, 2009;Vimonses et al, 2009).…”

Section: Effect Of Adsorbent Dosagementioning

confidence: 99%

Investigation of adsorption of the dyestuff astrazon red violet 3rn (basic violet 16) on montmorillonite clay

Fìl

Yılmaz

Bayar

et al. 2014

Braz. J. Chem. Eng.

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-In this study, color removal by absorption from synthetically prepared wastewater was investigated using montmorillonite clay by adsorption. As dyestuff Astrazon Red Violet 3RN (Basic Violet 16) was used. Experimental parameters selected were pH, temperature, agitation speed, initial dyestuff concentration, adsorbent dosage and ionic strength. It was established that adsorption rate increased with increasing pH, temperature, dye concentration and agitation speed, but decreased with increased ionic strength and adsorbent dosage. Adsorption equilibrium data obtained by a series of experiments carried out in a water bath were employed with common isotherm equations such as Langmuir, Freundlich, Temkin, Elovich and Dubinin-Radushkevich. It was found that the Langmuir equation appears to fit the equilibrium data better than the other models. Furthermore, the fit of the kinetic data to common kinetic models such as the pseudofirst-order, second-order, Elovich and intraparticle diffusion models was tested to elucidate the adsorption mechanism. Kinetic data conformed to the pseudo-second-order model, indicating chemisorptions. In addition, the thermodynamic parameters activation energy, Ea, enthalpy ΔH*, entropy, ΔS*, and free energy change, ΔG*, were calculated. The values of the calculated parameters indicated that physical adsorption of ARV on the clay was dominant and that the adsorption process was endothermic.

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Adsorption of dyes on Sahara desert sand

Cited by 71 publications

References 31 publications

Adsorption Profile of Basic Dye onto Novel Fabricated Carboxylated Functionalized Co-Polymer Nanofibers

Adsorption Profile of Basic Dye onto Novel Fabricated Carboxylated Functionalized Co-Polymer Nanofibers

Adsorption Capability of Ionic Dyes onto Pristine and Calcined Activated Clay

Investigation of adsorption of the dyestuff astrazon red violet 3rn (basic violet 16) on montmorillonite clay

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