Adsorption Characteristics of Rhodamine B from Aqueous Solution onto Baryte

Vijayakumar, G.; Elango, Kuppana Gounder P.; Dharmendirakumar, Mahendiradas

doi:10.1002/clen.200900125

Cited by 32 publications

(23 citation statements)

References 34 publications

(30 reference statements)

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“…This will increase the electrostatic attraction between the adsorbent and the positively charged dyes, and thus lead to the observed increase in removal efficiency with increasing pH. However, rhodamine B has a carboxylic group [55]. At low pH, the removal efficiency increased as pH increased, which was similar to that for malachite green.…”

Section: Effect Of Phmentioning

confidence: 75%

“…They are very useful in providing information about adsorption mechanisms, surface properties and affinity of an adsorbent towards an adsorbate [55].…”

Section: Adsorption Isothermsmentioning

confidence: 99%

“…Figure 7(a) shows the data for adsorption of dye solutions by MRGO at The kinetic data were analyzed using pseudo-secondorder kinetics [53][54][55], which is based on the assumption that chemisorption is the rate determining step, and can be expressed as Eq. (3) t/q t = 1/k 2 q e 2 + t/q e…”

Section: Analysis Of Adsorption Kineticsmentioning

confidence: 99%

See 2 more Smart Citations

Magnetite/reduced graphene oxide nanocomposites: One step solvothermal synthesis and use as a novel platform for removal of dye pollutants

2011

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A simple one step solvothermal strategy using non-toxic and cost-effective precursors has been developed to prepare magnetite/reduced graphene oxide (MRGO) nanocomposites for removal of dye pollutants. Taking advantage of the combined benefits of graphene and magnetic nanoparticles, these MRGO nanocomposites exhibit excellent removal efficiency (over 91% for rhodamine B and over 94% for malachite green) and rapid separation from aqueous solution by an external magnetic field. Interestingly, the performance of the MRGO composites is strongly dependent on both the loading of Fe 3 O 4 and the pH value. In addition, the adsorption behavior of this new adsorbent fits well with the Freundlich isotherm and the pseudo-second-order kinetic model. In further applications, real samples-including industrial waste water and lake water-have been treated using the MRGO composites. All the results demonstrate that the MRGO composites are effective adsorbents for removal of dye pollutants and thus could provide a new platform for dye decontamination.

show abstract

Section: Effect Of Phmentioning

confidence: 75%

“…They are very useful in providing information about adsorption mechanisms, surface properties and affinity of an adsorbent towards an adsorbate [55].…”

Section: Adsorption Isothermsmentioning

confidence: 99%

See 1 more Smart Citation

Magnetite/reduced graphene oxide nanocomposites: One step solvothermal synthesis and use as a novel platform for removal of dye pollutants

2011

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“…More than 10 000 chemically different dyes are manufactured. World dyestuff and dye intermediate production is estimated to be around 7 Â 10 8 kg per annum [1].…”

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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“…Surprisingly, they observed that the percentage removal efficiency of RhB onto EGO decreases with increase in pH, hence EGO showed poor adsorption behavior for RhB amongst the studied cationic dyes [27]. This observation is in sharp contrast to the recent studies on the adsorption of RhB onto different anionic adsorbents [28][29][30][31]. Previous studies have shown that adsorption behavior and/or performance of GO are dictated by its method of preparation [32].…”

Section: Introductionmentioning

confidence: 82%

Kinetics and Thermodynamic Studies for Rhodamine B Dye Removal onto Graphene Oxide Nanosheets in Simulated Wastewater

Bankole¹

2019

AJAC

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This report describes for the first time the kinetics, thermodynamic and optimized conditions for maximum removal of Rhodamine B in aqueous solution onto nanosheets of graphene oxides. Results from the GONS characterizations: UV, TEM, FTIR, EDX and XRD, revealed successful introduction of oxygen functionalities on the pristine graphite lattices. Adsorptive behaviour of RhB dye onto GONS under different experimental conditions such as pH, initial concentrations, adsorbent dosage, temperature, and contact time, were fully discussed in this work. The study showed that ≈93% of RhB was removed from simulated wastewater at; sorbent mass of 16.67mg; pH of 6.5; temperature of 298K; contact time of 60min; and concentrations ranging from 2.5 to 30mg/L. Experimental data tested against results of the kinetics and adsorption isotherm models, revealed that the sorption of RhB were best described by pseudo-second order and Freundlich models, respectively. Regeneration of the spent adsorbent was investigated using water, methanol and methanol/acetic acid (9:1) solution, as desorbing eluents. Methanol solution of acetic acid was observed to remove up to 94% of adsorbed RhB from GO surface compared to water (71.36%), and methanol (45.52%). The ease at which RhB was eluted from RhB-loaded GO using methanol/acetic acid (9:1), methanol and water shows that the adsorption mechanism is best described by physisorption.

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Adsorption Characteristics of Rhodamine B from Aqueous Solution onto Baryte

Cited by 32 publications

References 34 publications

Magnetite/reduced graphene oxide nanocomposites: One step solvothermal synthesis and use as a novel platform for removal of dye pollutants

Magnetite/reduced graphene oxide nanocomposites: One step solvothermal synthesis and use as a novel platform for removal of dye pollutants

Adsorption Characteristics of Reactive Black 5 from Aqueous Solution onto Chitosan

Kinetics and Thermodynamic Studies for Rhodamine B Dye Removal onto Graphene Oxide Nanosheets in Simulated Wastewater

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