Equilibrium and kinetics studies for adsorption of direct blue 71 from aqueous solution by wheat shells

Bulut, Yasemin; Gözübenli, Numan; Aydın, Haluk

doi:10.1016/j.jhazmat.2006.10.027

Cited by 152 publications

(81 citation statements)

References 23 publications

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“…In each case 0.10 g of either activated bottom ash or activated deoiled soya was taken and studies were performed at different temperatures (30,40, and 50°C). These solutions were then filtered after a particular time interval and spectrophotometric analysis was carried out for the amount of dye uptake.…”

Section: Kinetic Studiesmentioning

confidence: 99%

“…The study was performed at three different temperatures (30,40, and 50°C). With increase in amount of adsorbent adsorption was found to increase (Table 3).…”

Section: Effect Of Amount Of Adsorbentsmentioning

confidence: 99%

“…Pseudo-first-order and second-order rate equations were applied to phenol red-bottom ash system and phenol red-deoiled soya system [40,41]. The equations given below summarize the Lagergrens pseudo-first-order rate equation and pseudo-secondorder equation, respectively: logðq e À q t Þ ¼ log q e À k ad 2:303 Â t; ð11Þ…”

Section: Rate Constant Studymentioning

confidence: 99%

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Adsorption studies on the removal of coloring agent phenol red from wastewater using waste materials as adsorbents

Mittal

Kaur

Malviya

et al. 2009

Journal of Colloid and Interface Science

476

166

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a b s t r a c tBottom ash, a waste of thermal power plants, and deoiled soya, an agricultural waste material, were employed for successful removal and recovery of hazardous phenol red dye from wastewaters. The adsorption characteristics and operational parameters were determined by monitoring different parameters such as effect of pH, effect of concentration of the dye, amount of adsorbents, contact time, and temperature. The equilibrium data were analyzed on the basis of various adsorption isotherm models, namely Langmuir, Freundlich, Tempkin, and Dubinin-Radushkevich. The highest monolayer adsorption capacity has been obtained for the phenol red-bottom ash system (2.6 Â 10 À5 mol/g) at 50°C. Different thermodynamic parameters such as free energy, enthalpy, and entropy have been calculated and it was concluded that with the increase in temperature adsorption increases, indicating the endothermic nature of the process for both adsorbent materials. Kinetic parameters were derived from pseudo-firstorder and pseudo-second-order kinetics. Differentiation between particle and film diffusion mechanisms operative in the present study has been carried out. The column regeneration characteristic has been also investigated and recovery percentage greater than 90% was obtained for both adsorbents by utilizing acidic eluent.

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Section: Kinetic Studiesmentioning

confidence: 99%

“…The study was performed at three different temperatures (30,40, and 50°C). With increase in amount of adsorbent adsorption was found to increase (Table 3).…”

Section: Effect Of Amount Of Adsorbentsmentioning

confidence: 99%

See 1 more Smart Citation

Adsorption studies on the removal of coloring agent phenol red from wastewater using waste materials as adsorbents

Mittal

Kaur

Malviya

et al. 2009

Journal of Colloid and Interface Science

476

166

View full text Add to dashboard Cite

show abstract

“…Using dyes in many industries (Bulut et al 2007) such as textile, paper, plastics, leather, food and cosmetic, represent a large group of chemicals that get mixed in wastewater among many aqueous pollutants. In recent years, there is a dramatic increase in the annual production of different synthetic dyes representing more than 10,000 dyes (ALzaydien 2009).…”

Section: Introductionmentioning

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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“…The pseudo-first-order, pseudo-second-order, and intra-particle diffusion models were applied to describe the xylene adsorption mechanism. The pseudo-first-order kinetic model (Bulut et al 2007) is:…”

Section: Adsorption Kineticsmentioning

confidence: 99%

Tin(IV) oxide nanoparticles grafted with N,N-dimethylacrylamide–allyl butyl ether for xylene adsorption

Ardakani

Panahi

Hasani

et al. 2015

Int. J. Environ. Sci. Technol.

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This study presents a two-stage method for modification of tin(IV) oxide using (3-mercaptopropyl) trimethoxysilane and grafting of N,N-dimethylacrylamideallyl butyl ether copolymer. The resulting sorbent was characterized by Fourier transform infrared spectroscopy, elemental analysis, thermogravimetric analysis, transmission electron microscopy, scanning electron microscopy, and the Brunauer-Emmett-Teller method and evaluated for xylene adsorption from environmental water samples. Batch experiments were conducted to evaluate the effect of the analytical parameters of pH, contact time, initial concentration and temperature. The optimum pH was 5, contact time was 5 min, and temperature for sorption of xylene was 30°C. The capacity of the sorbent was 8.56 mg g -1 .Results showed good accessibility of the active sites. The equilibrium adsorption data of xylene sorption onto grafted nano-tin(IV) oxide were analyzed using the Langmuir, Freundlich, Temkin, and Redlich-Peterson isotherm models. The adsorption data were modeled as pseudo-firstorder, pseudo-second-order, and intra-particle diffusion kinetic equations. The results show that adsorption followed by the Langmuir isotherm and the pseudo-secondorder model and intra-particle diffusion model showed more than one process is controlling the adsorption process. The sorbent removed more than 90 % of the xylene from the water solution samples.

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Equilibrium and kinetics studies for adsorption of direct blue 71 from aqueous solution by wheat shells

Cited by 152 publications

References 23 publications

Adsorption studies on the removal of coloring agent phenol red from wastewater using waste materials as adsorbents

Adsorption studies on the removal of coloring agent phenol red from wastewater using waste materials as adsorbents

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

Tin(IV) oxide nanoparticles grafted with N,N-dimethylacrylamide–allyl butyl ether for xylene adsorption

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