The adsorption kinetics and removal of cationic dye, Toluidine Blue O, from aqueous solution with Turkish zeolite

Alpat, Sibel Kılınç; Özbayrak, Özge; Alpat, Şenol; Akçay, Hüsamettin

doi:10.1016/j.jhazmat.2007.05.071

Cited by 216 publications

(90 citation statements)

References 50 publications

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“…(Vadivelan and Vasanth Kumar 2005;Alpat et al 2008). The chemicals used in coloring and finishing phases are very harmful and lead to groundwater pollution which requires real solutions to improve the quality of dye and save water resources without affecting the yield and the quality of the textile production.…”

Section: Introductionmentioning

confidence: 99%

The alternating and direct current effect on the elimination of cationic and anionic dye from aqueous solutions by electrocoagulation and coagulation flocculation

Othmani

Kesraoui

Seffen

2017

Euro-Mediterr J Environ Integr

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In this study, we investigated the effect of alternating current (AC) and direct current (DC) on the elimination of methylene blue (MB) and indigo carmine (IC) by the electrocoagulation process using two Pb electrodes in comparison with the coagulation-flocculation process. Different parameters influencing the elimination of these dyes were studied, namely initial dye concentration, initial pH, voltage, temperature, coagulant and flocculant concentration and current density. The elimination of MB reached 98.8% with AC and 97.3% with DC at current density of 0.5 A/m 3 and pH of 7.0. However, the energy consumed was lower in the case of AC (4.89 9 10 -6 kWh/m 3 ) than DC (7.6 9 10 -6 kWh/m 3 ). The elimination was also faster in the case of AC (0.47 mg L -1 /min) than the DC (0.066 mg L -1 /min). The same behavior was observed with the IC where the effectiveness of dye elimination was, respectively, 98.5 and 100% with an energy consumed (E c ) of 4.35 9 10 -5 and 2.03 9 10 -6 kWh/m 3 , respectively, with DC and AC. The adsorption kinetic data were obtained using pseudo-firstorder and pseudo-second-order models. The pseudo-second-order was more appropriate describing the adsorption kinetics of methylene blue and the pseudo-first-order was more appropriate describing the adsorption kinetics of indigo carmine. Langmuir, Freundlich and Sips models were used to optimize the elimination dye process. The Sips model displayed the best fit of the equilibrium data.

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Section: Introductionmentioning

confidence: 99%

The alternating and direct current effect on the elimination of cationic and anionic dye from aqueous solutions by electrocoagulation and coagulation flocculation

Othmani

Kesraoui

Seffen

2017

Euro-Mediterr J Environ Integr

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“…The adsorption standard free energy changes (ΔG°) are determined with the following equation (Alpat et al, 2008;Lin et al, 2008),…”

Section: Thermodynamic Parametersmentioning

confidence: 99%

Equilibrium and kinetic adsorption study of aqueous basic dye solutions using waste foundry sand

Gürkan

Çoruh

2017

IJGW

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Abstract:The aim of this study is to evaluate adsorption kinetics, isotherms and thermodynamic parameters of crystal violet (CV) and methylene blue (MB) dyes from aqueous solution using waste foundry sand. Adsorption studies were carried out at different initial dye concentrations (12.5 -400 mg l -1 ), contact time (5 -240 min), pH (3.0 -9.0), sorbent doses (0.125 -2 g l -1 ) and adsorption temperature (20°C -70°C). The equilibrium adsorption data were analysed by Langmuir, Freundlich, Temkin and Dubinin-Radushkevich (DRK) adsorption isotherm models. Of the four adsorption isotherms, the R 2 value of Langmuir isotherm model for MB and CV were 0.969 and 0.926, respectively. Experimental data were analysed using the pseudo-first order, the pseudo-second order, intraparticle diffusion and Elovich models. The characteristic parameters for each model have been determined. In addition, the equilibrium thermodynamic parameters, including changes in Gibbs free energy, entropy and enthalpy are determined for the CV and MB on waste foundry sand.

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“…There are various methods to remove dyes from sewage, such as adsorption, biodegradation, coagulation, filtration and reverse osmosis (Han et al 2010;Yu et al 2010). Surface adsorption is considered to be an efficient process among color removal methods due to its low cost, ease of operation and high efficiency (Alpat et al 2008;Gök et al 2010).…”

Section: Introductionmentioning

confidence: 99%

Experimental design and modeling of removal of Acid Green 25 dye by nanoscale zero-valent iron

Shojaei

2017

Euro-Mediterr J Environ Integr

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We have used nanoscale zero-valent iron particles to remove Acid Green 25 (AG-25) dye from aqueous solution and have studied the effects of important variables, such as dye concentration, catalyst amount, pH and time, on the dye removal process, optimized by the Taguchi approach. Sixteen experiments were required to study the effect of all four parameters on removal of the dye. Each experiment was repeated three times to calculate the signal/ noise (S/N) ratio. Based on the S/N ratio, optimum values of 4, 0.6 g, 120 s, 20 mg L -1 were obtained for pH, catalyst amount, time and dye concentration, respectively. At the optimized condition, the removal percentages of AG-25 dye was found to be 96.82%.

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The adsorption kinetics and removal of cationic dye, Toluidine Blue O, from aqueous solution with Turkish zeolite

Cited by 216 publications

References 50 publications

The alternating and direct current effect on the elimination of cationic and anionic dye from aqueous solutions by electrocoagulation and coagulation flocculation

The alternating and direct current effect on the elimination of cationic and anionic dye from aqueous solutions by electrocoagulation and coagulation flocculation

Equilibrium and kinetic adsorption study of aqueous basic dye solutions using waste foundry sand

Experimental design and modeling of removal of Acid Green 25 dye by nanoscale zero-valent iron

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