Adsorption of three azo reactive dyes by metal hydroxide sludge: effect of temperature, pH, and electrolytes

Netpradit, Suchapa; Thiravetyan, Paitip; Towprayoon, Sirintornthep

doi:10.1016/j.jcis.2003.08.073

Cited by 216 publications

(98 citation statements)

References 14 publications

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“…This positive charge attracts the negative portions of the reactive dyes. This behavior was also observed by Netpradit et al (2004) who obtained a pH zpc of around 8.7, favoring the uptake of the negative charge of the reactive dyes.…”

Section: Effect Of Ph Of Adsorption Kineticssupporting

confidence: 79%

Adsorption of reactive dyes from aqueous solutions by tannery sludge developed activated carbon: Kinetic and equilibrium studies

Geethakarthi

Phanikumar

2011

Int. J. Environ. Sci. Technol.

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AB S TRAC T:Adsorption kinetic and equilibrium studies of two reactive dyes, namely, Reactive Red 31 and Reactive Red 2 were conducted. The equilibrium studies were conducted for various operational parameters such as initial dye concentration, pH, agitation speed, adsorbent dosage and temperature. The initial dye concentration was varied from 10 -60 mg/L, pH from 2 -11, agitation speed from 100-140 rpm, adsorbent dosage from 0.5 g to 2.5 g and temperature from 30 o C -50 o C respectively. The activated carbon of particle size 600 µm was developed from preliminary tannery sludge. The dye removal capacity of the two reactive red dyes decreased with increasing pH. The zero point charge for the sludge carbon was 9.0 and 7.0 for the two dyes, respectively. Batch kinetic data investigations on the removal of reactive dyes using tannery sludge activated carbon have been well described by the lagergren plots. It was suggested that the Pseudo second order adsorption mechanism was predominant for the sorption of the reactive dyes onto the tannery sludge based carbon. Thus, the adsorption phenomenon was suggested as a chemical process. The adsorption data fitted well with Langmuir model than the Freundlich model. The maximum adsorption capacity(q 0 ) from Langmuir isotherm were found to have increased in the range of 23.15-39.37 mg/g and 47.62-55.87 mg/g for reactive dyes reactive red 31 and reactive red 2, respectively.

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Section: Effect Of Ph Of Adsorption Kineticssupporting

confidence: 79%

Adsorption of reactive dyes from aqueous solutions by tannery sludge developed activated carbon: Kinetic and equilibrium studies

Geethakarthi

Phanikumar

2011

Int. J. Environ. Sci. Technol.

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“…Depending on the dye chemical composition one or more forces act in the adsorption process. According to (21), in aqueous solution anionic dyes carry a net negative charge due to the presence of sulphonate (SO −3 ) groups, while cationic dyes carry a net ACCEPTED MANUSCRIPT ACCEPTED MANUSCRIPT 14 positive charge due to the presence of protonated amine or sulfur containing groups. Pillared clay used in this study has negative charges in aqueous solution resulting from isomorphic substitution and aggregation of Al 3+ cations in natural clay.…”

Section: Effect Of Initial Phmentioning

confidence: 99%

Improvement in the Adsorption of Anionic and Cationic Dyes from Aqueous Solutions: A Comparative Study using Aluminium Pillared Clays and Activated Carbon

Aguiar

Bezerra

Siqueira

et al. 2014

Separation Science and Technology

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The aim of this work was evaluate the adsorption properties of anionic dye Reactive Black 5 (RB5) and cationic dye Methylene Blue (MB) from salted aqueous solution using natural clay, aluminum pillared clay (Al-PILC) and activated carbon. The textural properties of the materials were obtained by N 2 adsorption at 77 K and structural properties of natural and pillared clays were determined by Xray diffraction. The effect of pH, contact time, initial concentration of dye and influence of the addition of NaCl were evaluated by batch adsorption. Adsorption isotherms of Al-PILC, in different salt concentration, were compared with natural clay and activated carbon. The adsorption isotherms were well fitted by Langmuir and Langmuir-Freundlich models. The process of pillaring only improved the adsorption of the anionic dye RB5. Depending on the system adsorbent/adsorbate analyzed, the salt concentration can either help or hinder dye adsorption. We found that a special morphology formed during the process of pillaring greatly increased adsorption of the MB cationic dye in the range of high salt concentrations. This unexpected result may help in developing new pillarization strategies to treat effluents with high salt content.

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“…Reactive dyes are most risky compounds among other dyes in textile wastewater. These are highly water-soluble and estimated that 10-20% of reactive dyes remain in the wastewater during the production process of these dyes and nearly 50% of reactive dyes may lost to the effluent during dyeing processes of cellulose fibers [3,4]. Moreover, the complex aromatic molecular structures of reactive dyes make them more stable and more difficult to biodegrade [5,6].…”

Section: Introductionmentioning

confidence: 99%

Adsorption Characteristics of Reactive Black 5 from Aqueous Solution onto Chitosan

Saha

Bhoumik

Karmaker

et al. 2011

CLEAN Soil Air Water

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Adsorption of reactive black 5 (RB5) from aqueous solution onto chitosan was investigated in a batch system. The effects of solution pH, initial dye concentration, and temperature were studied. Adsorption data obtained from different batch experiments were modeled using both pseudo first-and second-order kinetic equations. The equilibrium adsorption data were fitted to the Freundlich, Tempkin, and Langmuir isotherms over a dye concentration range of 45-100 mmol/L. The best results were achieved with the pseudo second-order kinetic and Langmuir isotherm equilibrium models, respectively. The equilibrium adsorption capacity (q e ) was increased with increasing the initial dye concentration and solution temperature, and decreasing solution pH. The chitosan flakes for the adsorption of the dye was regenerated efficiently through the alkaline solution and was then reused for dye removal. The activation energy (E a ) of sorption kinetics was estimated to be 13.88 kJ/mol. Thermodynamic parameters such as changes in free energy (DG), enthalpy (DH), and entropy (DS) were evaluated by applying the van't Hoff equation. The thermodynamics of reactive dye adsorption by chitosan indicates its spontaneous and endothermic nature.

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Adsorption of three azo reactive dyes by metal hydroxide sludge: effect of temperature, pH, and electrolytes

Cited by 216 publications

References 14 publications

Adsorption of reactive dyes from aqueous solutions by tannery sludge developed activated carbon: Kinetic and equilibrium studies

Adsorption of reactive dyes from aqueous solutions by tannery sludge developed activated carbon: Kinetic and equilibrium studies

Improvement in the Adsorption of Anionic and Cationic Dyes from Aqueous Solutions: A Comparative Study using Aluminium Pillared Clays and Activated Carbon

Adsorption Characteristics of Reactive Black 5 from Aqueous Solution onto Chitosan

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