Kinetics and equilibrium studies from the methylene blue adsorption on diatomite treated with sodium hydroxide

Zhang, Jian; Ping, Qingwei; Niu, Meihong; Shi, Haiqiang; Li, Na

doi:10.1016/j.clay.2013.08.008

Cited by 91 publications

(35 citation statements)

References 29 publications

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“…An attraction between the dye molecules and surficial functional groups of the adsorbent will be predictable according to the negative value of ΔS • as enthalpy change. Furthermore, endothermic nature of the adsorption process can be confirmed by the obtained value for ΔH • , which is positive [28].…”

Section: Thermodynamic Studysupporting

confidence: 64%

“…where T (K), K D and R(8.314 J/mol K)are the absolute temperature, distribution coefficient and universal gas constant, respectively [6,28,30].The plot of lnK D versus 1/T can be used to determine the values of ΔH • and ΔS • as shown in Fig. 5.…”

Section: Thermodynamic Studymentioning

confidence: 99%

“…It contains many silanol groups, which have a tendency to adsorb organic compounds. Moreover, diatomite has low density, high permeability (0.1-10 mD), high porosity (25-65%) and subsequently high surface area creating a suitable structure for the adsorption of target pollutants [20,22,24,26,27].Silica-based adsorbents such as diatomite have already been used for the adsorption of inorganic and organic pollutants in raw and modified form [20,[27][28][29]. However, in the present study, the application of nano-crystalline Iranian diatomite prepared through ball milling technique was applied for the adsorption of an azo dye (Direct Red23 (DR23)) in aqueous solution.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Application of Nanocrystalline Iranian Diatomite in Immobilized Form for Removal of a Textile Dye

Soltani

Safari

Maleki

et al. 2015

Journal of Dispersion Science and Technology

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The aim of the present investigation was to immobilize nano-crystalline diatomite within calcium alginate matrix for the adsorption of Direct Red23 (DR23) in aqueous media.Scanning electron microscopy (SEM), X-ray diffraction (XRD) and Fourier transform infra-red (FT-IR) spectroscopy were used to characterize the samples. As results, the adsorption process obeyed pseudo-second order kinetic model (R 2 =0.9934) and Langmuir isotherm model (R 2 =0.9732) with a maximum adsorption capacity of 24.10 mg/g. The value of mean free energy (15.81 kJ/mol) demonstrated that the process has been taken place chemically. As the adsorbent dosage increased from 0.5 to 3.0 g/L, the decolorization efficiency (%) increased from 26.0 to 75.5%, respectively. Inversely, the decolorization efficiency (%) decreased from 98.0 to 29.0% with increasing initial dye concentration from 5 to 160 mg/L, respectively. The negative values obtained for Gibbs free energy (ΔG • ) and positive value of enthalpy change (ΔH • ) indicated spontaneous and endothermic nature of the process.

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Section: Thermodynamic Studysupporting

confidence: 64%

Section: Thermodynamic Studymentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Application of Nanocrystalline Iranian Diatomite in Immobilized Form for Removal of a Textile Dye

Soltani

Safari

Maleki

et al. 2015

Journal of Dispersion Science and Technology

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“…Methylene blue (MB) is extensively used on an industrial scale as an organic dye [1,2]. However, its harmful impact on the human organism [3] and natu ral ecosystems [1] is well known, since this dye, in the course of reaching water basins through industrial waste pollution, blocks the percolation of light, slows plants' photosynthesis, and can form complexes with metal ions that are toxic for living organisms [1].…”

Section: Introductionmentioning

confidence: 99%

“…However, its harmful impact on the human organism [3] and natu ral ecosystems [1] is well known, since this dye, in the course of reaching water basins through industrial waste pollution, blocks the percolation of light, slows plants' photosynthesis, and can form complexes with metal ions that are toxic for living organisms [1]. MB is robust against destruction by chemical, physical, and biological methods [2][3][4]. MB is also extensively used as a marker of endogenic intoxication in studies of different sorbents for medical applications, in par ticular, enterosorbents [5,6].…”

Section: Introductionmentioning

confidence: 99%

Adsorption of methylene blue from aqueous solutions by synthetic montmorillonites of different compositions

Golubeva

Pavlova

2016

Glass Phys Chem

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The sorption capacity of synthetic montmorillonites of the composition Na 2x (Al 2(1 -x) ,Mg 2x )Si 4 O 10 (OH) 2 · nH 2 O (where 0 < x < 1) in relation to the methylene blue dye has been investigated. The obtained results from the data for natural samples of montmorillonite (K10) and activated carbon have been compared. The effect of the montmorillonite composition and the medium acidity on the degree of dye adsorption has been stud ied. The chemical composition of montmorillonite, which is optimal for solving tasks in the field of ecology and medicine, has been determined. The character of the interaction of montmorillonites with the adsorbed substance from the point of view of the physical chemical sorption models has also been studied.

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Comparison of a Homemade Bacuri Shell Activated Carbon With Carbon Nanotubes for Food Dye Removal

Saucier

Adebayo

Lima

et al. 2015

CLEAN Soil Air Water

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The shell of bacuri together with inorganic components [red mud þ lime þ KOH þ KAl(SO 4 ) 2 þ Al(OH) 3 ] at different ratios of 1.0 (BC-1.0), 1.5 (BC-1.5), and 2.0 (BC-2.0) were pyrolized at 1073 K. To complete the chemical activation process, the inorganic components were leached from the carbonaceous matrix through acidification with 6 M HCl under reflux to obtain ABC-1.0, ABC-1.5 and ABC-2.0. ABC-1.5 showed the highest adsorption capacity among these adsorbents. Fourier transform IR spectroscopy, scanning electron microscopy, N 2 adsorption/desorption curves and X-ray diffraction were used to characterize BC-1.5 (precursor) and ABC-1.5 (activated carbon). The analyses indicate that the majority of the inorganic compounds were leached from the carbonaceous matrix, resulting in an activated carbon with a high surface area and pore volume, suitable for dye adsorption. The sorption capacity of ABC-1.5 was compared with multi-walled carbon nanotubes (MWCNT) for removal of Brilliant Blue food dye (BB-FCF) from aqueous solutions. The general order kinetic model described well the adsorption process. The maximum amounts of BB-FCF removed at 323 K were 647.9 and 231.5 mg g À1 for ABC-1.5 and MWCNT, respectively. In addition, ABC-1.5 and MWCNT were applied for the treatment of two simulated effluents.

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Kinetics and equilibrium studies from the methylene blue adsorption on diatomite treated with sodium hydroxide

Cited by 91 publications

References 29 publications

Application of Nanocrystalline Iranian Diatomite in Immobilized Form for Removal of a Textile Dye

Application of Nanocrystalline Iranian Diatomite in Immobilized Form for Removal of a Textile Dye

Adsorption of methylene blue from aqueous solutions by synthetic montmorillonites of different compositions

Comparison of a Homemade Bacuri Shell Activated Carbon With Carbon Nanotubes for Food Dye Removal

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