Adsorption Kinetics of Blue 5G Dye from Aqueous Solution on Dead Floating Aquatic Macrophyte: Effect of pH, Temperature, and Pretreatment

Fagundes‐Klen, Márcia Regina; Cervelin, Patricia Caroline; Veit, Márcia Teresinha; Gonçalves, Gilberto da Cunha; Silva, Flávia Vieira da

doi:10.1007/s11270-012-1201-x

Cited by 19 publications

(7 citation statements)

References 16 publications

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“…Other authors also reported higher dye adsorption capacities at acidic pH using several adsorbents. [3][4][5][6][7][8][9][10]20,22,27,28,33 The behavior of Reactive Blue 5G adsorption can be explained by means of the competitive adsorption of the mixture solute/H + (or OH − ) present in the solution. pH directly affects the protonation/deprotonation process of the functional groups present at the adsorbent surface.…”

Section: ■ Results and Discussionmentioning

confidence: 98%

“…Equilibrium isotherms suggested that the activated carbon could be an excellent adsorbent for Reactive Blue 5G dye removal. The dye removal was higher at pH 2 and 303 K: the maximum capacity was up to 10 times those published previously by Fiorentin et al 3 and Fagundes-Klen et al 33 The value of the apparent enthalpy of adsorption suggested that the process was exothermic and chemical in nature. In summary, we presented a viable route for Reactive 5G dye removal using adsorption processes.…”

Section: ■ Conclusionmentioning

confidence: 99%

“…Chemically it is classified as an azo-dye, due the presence of NN bonds, as shown in Table . Besides its importance, only a few studies concerning its removal using adsorption can be found in the literature. ,,− …”

Section: Introductionmentioning

confidence: 99%

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Reactive Blue 5G Adsorption onto Activated Carbon: Kinetics and Equilibrium

Martins¹,

Schimmel²,

Santos³

et al. 2012

J. Chem. Eng. Data

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Adsorption studies are essential before implementation in an industrial plant. We studied the Reactive Blue 5G removal by activated carbon from Pinus sp. Physical and chemical characteristics of the adsorbent were evaluated with N2 adsorption/desorption experiments at 77 K, and equilibrium and kinetics studies were performed in a batch reactor at several temperatures and pH values. Our results showed that the activated carbon had a high surface area, effective diffusion coefficients were of the order of 10–12 cm2·s–1, and mass transfer coefficients were present in both fluid and solid phases. Equilibrium and kinetics experiments confirmed that pH and temperature play an important role: the dye uptake became higher as the temperature and pH decreased, and the optimum removal was at 303 K and pH 2. Finally, thermodynamics analysis suggested that the process is exothermic and chemical in nature. In summary, we showed that activated carbon can be more effective than other adsorbents already used to remove the Reactive Blue 5G from wastewater.

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Section: ■ Results and Discussionmentioning

confidence: 98%

Section: ■ Conclusionmentioning

confidence: 99%

See 1 more Smart Citation

Reactive Blue 5G Adsorption onto Activated Carbon: Kinetics and Equilibrium

Martins¹,

Schimmel²,

Santos³

et al. 2012

J. Chem. Eng. Data

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“…Therefore, the electrostatic repulsion between the adsorbent site and the negatively charged dye ions was reduced at low pH. Consequently, positively charged functional groups could exert a strong electrostatic attraction on anionic dye molecules 32,33 .…”

Section: Point Of Zero Charge (Phpzc) Ph and Temperature Effectmentioning

confidence: 99%

“…Figure 3 shows the experimental data of amount of dye adsorbed (qe) versus time for each temperature studied at pH 4. The temperature significantly influences the kinetic energy of the molecules and interferes on the attraction and repulsion forces between the adsorbate and the adsorbent 33 . In the range of temperature and conditions studied, an increase in the adsorbed amount was observed as the temperature increases, with 50 °C being the one that presented the best results.…”

Section: Point Of Zero Charge (Phpzc) Ph and Temperature Effectmentioning

confidence: 99%

Biosorption of 5G blue reactive dye using waste rice husk

et al. 2018

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In this study, the biosorption was used on the removal of 5G blue dye using rice husk residue. Was evaluated the influence of temperature and pH on the biomass pretreated with H3PO4 and NH4Cl. The tests were realized in batch with previous determination of point of zero charge (PZC). Analytical measurements were performed by UV-Vis spectroscopy. It was observed a major influence of pH and temperature on the biosorption capacity of the dye, being the highest removal obtained for the condition of pH 2 and temperature of 50 °C. The time for the biomass-dye system to reach equilibrium was around 45 min. The kinetic model of pseudo-first order adequately represented experimental data and had a good correlation coefficient. In the equilibrium study, it was verified that the Langmuir isotherm was the best fit for the experimental data, with a maximum biosorption capacity of 3,84 mg g-1. The use of rice husk as a biosorbent for the removal of reactive blue 5G dye can be considered promising for the abundance of this residue and the observed sorption capacity

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