Dye adsorption on unburned carbon: Kinetics and equilibrium

Wang, Shaobin; Li, Huiting

doi:10.1016/j.jhazmat.2005.05.049

Cited by 128 publications

(69 citation statements)

References 16 publications

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“…The isotherm was found to be linear almost over the whole range of concentrations as evidenced by the value of correlation coefficient (R 2 ), 0.9919 (Fig.6). This implies that the adsorption equilibrium data almost exactly fit the Langmuir model (Debnath and Uday, 2008;Wang and Li, 2005). The isotherm constants K L , a L and the equilibrium monolayer capacity Q 0 are presented in Table 2.…”

Section: Adsorption Isothermsupporting

confidence: 52%

Preparation of adsorbent with magnesium sulfate and straw pulp black liquor and its phenol adsorption properties

Li-wei

Wang

2009

J. Ocean Univ. China

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A magnesia adsorbent was prepared from straw pulp black liquor and magnesium sulfate for the first time, and its adsorption of phenol from aqueous solution was examined. The characteristics of the adsorbent were tested through chemical analysis, surface analysis, X-ray diffraction and FT-IR spectroscopy. The effects of various factors, such as dose, adsorption time and adsorption temperature, on phenol adsorption behavior were studied. The results show that the adsorption processes can be fitted to the isotherm Langmuir model very well. It was found that the adsorption process was strongly influenced by temperature and the optimal temperature for phenol removal was 40 ℃. The optimum adsorption time was 10 min, and desorption would happen afterwards. Between the models of Langmuir and Freundlich, the adsorption process of phenol onto magnesia fitted the Langmuir equation better.

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Section: Adsorption Isothermsupporting

confidence: 52%

Preparation of adsorbent with magnesium sulfate and straw pulp black liquor and its phenol adsorption properties

Li-wei

Wang

2009

J. Ocean Univ. China

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“…Accordingly, Langmuir isotherm is only valid for single layer adsorption [44]. In addition, no interaction occurs among the adsorbed molecules and adsorption occurs with the same mechanism on all adsorption regions of the surface, that is, the absorbed units have identical activation energies [47]. Langmuir isotherm equation is the following:…”

Section: Langmuir Adsorption Isothermmentioning

confidence: 99%

Kinetic and Isotherm Analysis of Cu(II) Adsorption onto Almond Shell (Prunus Dulcis)

Yıldız

2017

Ecological Chemistry and Engineering S

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Abstract:In the work, adsorption of Cu 2+ ions onto almond shell were investigated under different operational conditions. Almond shell was used without any pretreatment prior to the tests. The optimum conditions for adsorption of Cu 2+ ions through almond shell were determined to be; pH 5.0, temperature 20ºC, shaking rate 125 rpm, sorbent dose 0.3 g and initial Cu 2+ ion concentration 50 mg/dm 3 . The equilibrium duration of the system was 60 minutes. The sorption capacities of the sorbents were predicted with the aid of equilibrium and kinetic models. The interactions of peanut shell with metal ions were constituted by SEM, EDX, FT-IR, XRD and AFM. The pseudo-first-order, pseudo-second-order, Weber-Morris, Elovich model and Bangham kinetic models were applied to test the experimental data. The Cu +2 ions adsorption onto almond shell was better defined by the pseudo-second-order kinetic model, for initial pH. The equilibrium data were evaluated using Langmuir, Freundlich, Temkin, D-R and Harkins Jura isotherms. The highest R 2 value in isotherm studies was obtained from Langmiur isotherm (R 2 = 0.98) for the inlet concentration.

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“…Of the abovementioned techniques, adsorption was recognized as a promising and cost-effective process to remove colors from aqueous solutions. Additionally, many kinds of adsorbents have been developed for various applications [8][9][10][11][12].…”

Section: Introductionmentioning

confidence: 99%

Adsorption Capability of Ionic Dyes onto Pristine and Calcined Activated Clay

Ogata

Ueta

Kawasaki

2016

e-J. Surf. Sci. Nanotech.

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In this study, pristine and calcined activated clay (AC) were characterized by scanning electron microscopy, X-ray diffraction analysis, thermogravimetric-differential thermal analysis, electron probe microanalysis, surface pH measurement, specific surface area measurement, and humidity adjustment. ACs were used as adsorbents for investigating the adsorption kinetics, isotherms, thermodynamic parameters, of Basic Red 46 (BR), Basic Blue 75 (BB), Acid Red 138 (AR), and Acid Blue 185 (AB) in aqueous solutions, as well as the effect of sodium hydroxide on these dyes. The results showed that adsorption of cationic and anionic dyes was related to the specific surface area (0.974-0.984) and humidity adjustment performance (0.939-1.000), respectively. The adsorption capacity of the cationic dyes (BB and BR) onto pristine AC increased on increasing the temperature. Equilibrium data using pristine AC fitted well to both the Langmuir and Freundlich isotherm models. Kinetic data were best described by the pseudo-second order model (correlation coefficient was 0.979-0.999 and 0.945-0.999 for BB and BR). Nearly 8 h of contact time was sufficient for the adsorption of cationic dyes to reach equilibrium. Thermodynamic parameters were also evaluated for the cationic dye-adsorbent system, which revealed that the adsorption process is endothermic in nature. These results demonstrated that pristine AC could be used as a natural adsorbent for the removal of cationic dyes (BB and BR) from aqueous solution.

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Dye adsorption on unburned carbon: Kinetics and equilibrium

Cited by 128 publications

References 16 publications

Preparation of adsorbent with magnesium sulfate and straw pulp black liquor and its phenol adsorption properties

Preparation of adsorbent with magnesium sulfate and straw pulp black liquor and its phenol adsorption properties

Kinetic and Isotherm Analysis of Cu(II) Adsorption onto Almond Shell (Prunus Dulcis)

Adsorption Capability of Ionic Dyes onto Pristine and Calcined Activated Clay

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