Sorption isotherm and kinetic modeling of aniline on Cr-bentonite

Zheng, Hong; Liu, Donghong; Zheng, Yan; Liang, Shuai; Liu, Zhe

doi:10.1016/j.jhazmat.2008.12.093

Cited by 252 publications

(107 citation statements)

References 28 publications

(35 reference statements)

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“…To ascertain the range of conditions over which the adsorption of lead by activated sawdust was favorable, the dimensionless parameter RL was estimated as follows: (5) where RL is the separation factor, KL is the constant of the Langmuir isotherm, and C0 is initial concentration. According to Zheng et al (2009), RL = 0 suggests that the adsorption process is irreversible; 0 < RL < 1 denotes a favorable process, RL = 1 suggests that the process is linear, and RL > 1 suggests that the adsorption process is unfavorable. Figure 6 clearly shows that the sorption of lead onto activated sawdust of Khaya ivorensis and Pycanthus angolensis was favorable for all experimental conditions and variables investigated.…”

Section: Fig 4 Variation Of Removal Efficiency and Quantity Adsorbementioning

confidence: 99%

“…The intraparticle diffusion rate ranged from 0.32 to 0.98 mg/g min 1/2 for Khaya ivorensis and 0.19 to 1.017 mg/g min 1/2 for Pycnanthus angolensis. Zheng et al (2009) obtained very similar values (0.14 to 0.98 mg/g min 1/2 ) for the sorption of aniline to bentonite at initial solute concentrations ranging between 20 and 120 mg/L. Judging by the R 2 values, the pseudo first order kinetic model accurately mimicked the adsorption kinetics in all cases with 0.96 ≤ R 2 ≤ 1.0 for Khaya ivorensis and 0.9 ≤ R 2 ≤ 1.0 for Pycnanthus angolensis.…”

Section: Fig 8b Temkin Isotherm For Khaya Ivorensismentioning

confidence: 99%

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Effect of Particle Size on the Sorption of Lead from Water by Different Species of Sawdust: Equilibrium and Kinetic Study

Nnaji

Emefu

2017

BioResources

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Both the effect of particle size and initial concentration on the adsorption of lead by sawdust of two timber species were investigated using batch experimental equilibrium and kinetic studies. A 100% lead removal efficiency was recorded for the optimum particle size of 1.18 mm for Pycnanthus angolensis and 0.85 mm for Khaya ivorensis at an initial lead concentration of 10 mg/L. Freundlich isotherm (0.83 ≤ R 2 ≤ 0.96 for Khaya ivorensis and 0.94 ≤ R 2 ≤ 1.0 for Pycnanthus angolensis) performed better than Langmuir and Temkin isotherms. The Dubinin-Radushkevich isotherm was used to ascertain the sorption mechanism. Mean sorption energy (12.48 kJ/mol for Pycnanthus angolensis and 13.42 kJ/mol for Khaya ivorensis) indicated that adsorption was by ion exchange. The pseudo-first order kinetic model (0.96 ≤ R 2 ≤ 1.0 for Khaya ivorensis and 0.90 ≤ R 2 ≤ 1.0 Pycnanthus angolensis) performed better than others with respect to R 2 values, while the intraparticle diffusion model performed better than the other kinetic models with respect to absolute mean error (AME).

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Section: Fig 4 Variation Of Removal Efficiency and Quantity Adsorbementioning

confidence: 99%

Section: Fig 8b Temkin Isotherm For Khaya Ivorensismentioning

confidence: 99%

Effect of Particle Size on the Sorption of Lead from Water by Different Species of Sawdust: Equilibrium and Kinetic Study

Nnaji

Emefu

2017

BioResources

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“…The value of E in D-R isotherm is very useful in predicting the type of adsorption, and if the value is from 1 to 8 kJ mol , the adsorption is chemical in nature (Dubinin et al 1947;Saltalı et al 2007;Zheng et al 2009). The value of E was found to be 3.075 kJ mol -1 suggesting the physical nature of the adsorption process in the present study.…”

Section: Adsorption Isotherm and Thermodynamic Propertiesmentioning

confidence: 99%

Adsorption of hexavalent chromium ions from aqueous solution by graphene nanosheets: kinetic and thermodynamic studies

Goharshadi

Moghaddam

2015

Int. J. Environ. Sci. Technol.

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In the present study, a batch system was used to investigate the adsorption of chromium (VI) ions from an aqueous solution by graphene nanosheets. Graphene is decorated with functional groups containing oxygen such as epoxy and hydroxyl on the basal plane. The large negative charge density available on graphene causes effective adsorption of chromium (VI) ions from aqueous solutions. The adsorption capacity and rate of chromium (VI) ions at different temperatures, adsorbent dosages, initial concentrations, and contact times were evaluated. The kinetic study illustrated that the adsorption of chromium (VI) ions onto graphene obeys the pseudo-second-order model with activation energy of 21.91 kJ mol -1 . The chromium (VI) ions adsorption was well explained using Dubinin-Radushkevich isotherm model. The values of standard enthalpy, entropy, and Gibbs free energy changes at 25°C were calculated as 686.07 kJ mol -1 , 2.38 kJ mol -1 K -1 , and -22.43 kJ mol -1 , respectively. In this work, graphene was prepared via a green method. Transmission electron microscopy, Fourier transform-infrared spectroscopy, energy-dispersive X-ray analysis, powder X-ray diffraction, Boehm's titration, and N 2 adsorption-desorption techniques revealed a high-quality few-layer nanosheets of graphene with surface area and inter-planar spacing of 594.7 m 2 g -1 and 3.6 Å , respectively.

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“…If n = 1, this indicates that the partition of two phases are independent of concentration and the adsorption isotherm can be reduced to a linear form. If 1<n<10, this indicates a favorable sorption process 24 . Table 1 shows that the value of 1/n = 0.392 (n = 2.553), which indicates that adsorption of PC onto DCTW is favorable.…”

Section: The Freundlich Isothermmentioning

confidence: 99%

Adsorption of penicillin by decaffeinated tea waste

Gharbani

Mehrizad

Jafarpour

2015

Polish Journal of Chemical Technology

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Removal of penicillin has been investigated using decaffeinated tea waste (DCTW). Decaffeination of tea waste was investigated using different methods. Results indicate that ozonation was the most effective process for removal of penicillin. Batch adsorption experiments were completed at various temperatures (20, 30, and 40°C), DCTW dosages (2, 4, 6, 8, and 10 g per 250 mL), penicillin concentrations (4, 10, and 14 mg/L), and pH (3, 7, and 10) conditions. Studies showed that adsorption reaches equilibrium within 40 min. The main factor affecting adsorption of penicillin was the solution pH, with maximum adsorption occurring at pH 3. Higher adsorbent dosages and lower penicillin concentrations also resulted in higher percentages of penicillin removal. Results show that data obeyed the pseudo-fi rst-order kinetic and Freundlich isotherm models. This process proves that low-cost DCTW could be used as a high performance adsorbent for removing penicillin from aqueous solutions.

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Sorption isotherm and kinetic modeling of aniline on Cr-bentonite

Cited by 252 publications

References 28 publications

Effect of Particle Size on the Sorption of Lead from Water by Different Species of Sawdust: Equilibrium and Kinetic Study

Effect of Particle Size on the Sorption of Lead from Water by Different Species of Sawdust: Equilibrium and Kinetic Study

Adsorption of hexavalent chromium ions from aqueous solution by graphene nanosheets: kinetic and thermodynamic studies

Adsorption of penicillin by decaffeinated tea waste

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