Adsorption thermodynamics of Methylene Blue onto bentonite

Hong, Su Young; Wen, Cheng; He, Jing; Gan, Fuxing; Ho, Yuh‐Shan

doi:10.1016/j.jhazmat.2009.01.014

Cited by 295 publications

(113 citation statements)

References 21 publications

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“…The kinetics of adsorption was calculated based on experimental results of the variation of the interaction time (15,30,45,60, and 90 minutes) between 200 mg.L -1 of Methylene Blue and 10 mg adsorbent Fly Ash and Silica Gels. The mixture was filtered, and the filtrate was measured as a residual concentration of MB that was not absorbed by the adsorbent.…”

Section: Kinetics Of Adsorptionmentioning

confidence: 99%

See 1 more Smart Citation

Silica Gels from Coal Fly Ash as Methylene Blue Adsorbent: Isotherm and Kinetic Studies

Sulistiyo

Andriana

Piluharto

et al. 2017

Bull. Chem. React. Eng. Catal.

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A lot of dye pollutants were released in the aquatic environment as waste from industrial coloring process. This research aimed to study silica gels (SG) as a potential adsorbent to remove the dyes. The SG can be synthesized from coal fly ash (FA), which is industrial solid waste rarely utilized, using the sol-gel method. Its properties were then characterized by FTIR, XRD, SEM, and isothermal ads-des N2.As a result, FTIR spectra and XRD diffractogram exhibited the successfully SG synthesized from FA with the amorphous structure. The image analysis using SEM demonstrated that SG particles are spherical. The isotherm type, based on isotherm ads-des N2, is type II without hysteresis loop which represents the nonporous material SG with the surface area and pore diameter of 25.977 m 2 /g and 1.52 nm, respectively. The adsorption capacity performance of SG to remove methylene blue (MB) as a basic dye is 62.70 % which is higher than FA, following Langmuir isotherm adsorption model. The kinetics of adsorption rate of SG are based on the pseudo second order models accelerated by 3.37 times faster than FA.

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Section: Kinetics Of Adsorptionmentioning

confidence: 99%

“…The influence of adsorption time was carried out by interacting methylene blue with the concentration of 200 mg.L -1 and adsorbent (fly ash and silica gels) using a variation of the concentration of 15,30,45,60, and 90 minutes. The adsorbed concentration of the methylene blue in the adsorbent material is shown in Figure 9.…”

Section: The Kinetics Adsorptionmentioning

confidence: 99%

Silica Gels from Coal Fly Ash as Methylene Blue Adsorbent: Isotherm and Kinetic Studies

Sulistiyo

Andriana

Piluharto

et al. 2017

Bull. Chem. React. Eng. Catal.

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“…If parameter ΔH° has a negative value, it is the exothermic adsorption process. Increased randomness during adsorption is present if the value of the parameter ΔS° is positive [23,24]. Table 4 shows that the adsorption of Cu (II) ions on the waste foundry molding sand takes place spontaneously and has a chemical nature.…”

Section: Resultsmentioning

confidence: 99%

Microstructural and Equilibrium Adsorption Study of the System of Waste Foundry Molding Sand/Cu (II) Ions

Štrkalj

Glavaš

Slokar

2016

Archives of Metallurgy and Materials

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MIcrostructural and equIlIbrIuM adsorptIon study of the systeM of waste foundry MoldIng sand/cu (II) IonsThis paper deals with the waste foundry molding sand which originally comes from the casting production. Adsorption of Cu (II) ions on the waste foundry molding sand was studied. Experimental data were processed using adsorption isotherms. obtained results show that the experimental data are best described by the Langmuir isotherm. The following adsorption capacities are obtained: 7.153 mg/g to 293 k, 8.403 mg/g at 333 k and 9.208 mg/g at 343 k. The kinetics and thermodynamics of the process were analysed. The obtained results indicate that the adsorption process takes place according to the pseudo second order kinetic model with the following constants: 0.438 g/mg min at 293 k, 0.550 g/mg min at 333 k and 1.872 g/ mg min at 343 K. The following values of ΔG° were obtained: -95.49 j/mol at 293 k, -736.99 j/mol at 333 k and -1183.46 J/mol at 343 K. The value of ΔH° is -4.16 kJ/mol and the value of ΔS° is 15.17 j/molk. These results were confirmed by microscopic examinations. The results indicate that the adsorption process of Cu (II) ions on waste foundry molding sand is possible. Results of microscopic examinations show the homogeneity of the surface, which is proof of the chemisorption. Cu (II) ions on the surface of the waste foundry molding sand were detected after adsorption by EDS analysis, which proves the existence of the adsorption process.

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“…Considering the relationship between ΔG 0 and K L , ΔH 0 and ΔS 0 were determined from the slope and intercept of the van't Hoff plots of log(K L ) versus 1/T. Negative values of ΔG 0 confirm the feasibility of the process and the spontaneous nature of the adsorption (36,37,38) . In general, the ΔH 0 value of physisorption is smaller than 40 kJ/mol (36).…”

Section: Adsorption Thermodynamicmentioning

confidence: 99%

Rhodium Adsorption on Valonea Resol Polymer

Can

2014

Proceedings of 1st International Electronic Conference on Materials

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Adsorption thermodynamics of Methylene Blue onto bentonite

Cited by 295 publications

References 21 publications

Silica Gels from Coal Fly Ash as Methylene Blue Adsorbent: Isotherm and Kinetic Studies

Silica Gels from Coal Fly Ash as Methylene Blue Adsorbent: Isotherm and Kinetic Studies

Microstructural and Equilibrium Adsorption Study of the System of Waste Foundry Molding Sand/Cu (II) Ions

Rhodium Adsorption on Valonea Resol Polymer

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