Kinetic and equilibrium studies in removing lead ions from aqueous solutions by natural sepiolite

Bektaş, Nihal; Ağım, Burcu Akman; Kara, Serdar

doi:10.1016/j.jhazmat.2004.04.015

Cited by 158 publications

(79 citation statements)

References 22 publications

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“…sorption processes appears to be controlled by sharing of electrons between the adsorbent and the adsorbate, or covalent forces, through the exchange of electrons between the particles involved (Zou et al 2011). Similar results were also reported by Sen and Gomez (2011) and Bektas et al (2004) in their studies on sorption of zinc and lead ions on bentonite and sepiolite particles, respectively.…”

Section: Kinetic Studiessupporting

confidence: 77%

Kinetics and thermodynamics of zinc removal from a metal-plating wastewater by adsorption onto an Iranian sepiolite

Hojati

Landi

2014

Int. J. Environ. Sci. Technol.

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The study of the kinetics and thermodynamics of the adsorption process can provide valuable information for the proper design and control of adsorption systems. The influence of temperature on the kinetics of Zn 2?sorption on an Iranian sepiolite sample was investigated through a series of batch experiments. Consistent with an exothermic reaction, an increase in the temperature resulted in decreasing Zn 2? adsorption rate. The sorption kinetics was tested for pseudo-first-order, pseudo-secondorder, and intraparticle diffusion models, and the rate constants were calculated. Results showed that the adsorption kinetics followed the pseudo-second-order kinetic model. The intraparticle diffusion model described that sorption of Zn onto the sepiolite particles is a two-step process, and intraparticle diffusion is not the only ratelimiting step. The results obtained from the study of thermodynamic data indicated that sorption of Zn onto sepiolite is non-spontaneous and less favored at higher temperatures.

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Section: Kinetic Studiessupporting

confidence: 77%

Kinetics and thermodynamics of zinc removal from a metal-plating wastewater by adsorption onto an Iranian sepiolite

Hojati

Landi

2014

Int. J. Environ. Sci. Technol.

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“…T is the absolute temperature (K), R is the gas constant (8.314 J Ficus religiosa leaves Kapoor et al 1999 Babel and Kurniawan, 2004Tan et al 1993Sharma and Forster, 1994Sharma and Forster, 1994Sharma and Forster, 1994Qaiser et al 2009 mole -1 K -1 ) and k d is the equilibrium constant given by the following equation (Bektas et al 2004). …”

Section: Effect Of Temperaturementioning

confidence: 99%

Biosorption of lead(II) and chromium(VI) on groundnut hull: Equilibrium, kinetics and thermodynamics study

Qaiser¹,

Saleemi²,

Umar³

2009

Electro Journal of Biotech

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Abbreviations: FTIR: Fourier transform infrared rpm: rotations per minute SEM: scanning electron microscopeThe biosorption of lead(II) and chromium(VI) on groundnut hull was investigated. Batch biosorption experiments were conducted to find the equilibrium time and biosorption capacity. Effect of parameters like pH, temperature and initial metal concentration was studied. The maximum biosorption capacity of lead(II) and chromium(VI) was found to be 31.54 ± 0.63 and 30.21 ± 0.74 mg g -1 , respectively. The optimum pH for lead(II) and chromium(VI) removal was 5 ± 0.1 and 2 ± 0.1, respectively. The temperature change, in the range of 20 -45ºC affected the biosorption capacity. The maximum removal of lead(II) was achieved at 20 ± 2ºC, where as maximum uptake of chromium(VI) was observed at 40 ± 2ºC. The biosorption data was fitted to the Langmuir and the Freundlich isotherm models. The Langmuir model showed better representation of data, with correlation coefficient greater than 0.98. The kinetics of biosorption followed the pseudo second order kinetics model. The thermodynamics parameters were evaluated from the experimental data.

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“…In one hand, Pb (II) can be removed from aqueous/ acidic solutions by using bentonite and natural sepiolite as an adsorbent [6,7]. The removal of Cu (II) from aqueous solution by using kaolinite, montmorillonite and their modified adsorbents [8].…”

Section: Introductionmentioning

confidence: 99%

Structural Properties of Synthetic Na-Hectorite Exchanged with Heavy Metals

Salah¹

2011

MSA

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Kinetic and equilibrium studies in removing lead ions from aqueous solutions by natural sepiolite

Cited by 158 publications

References 22 publications

Kinetics and thermodynamics of zinc removal from a metal-plating wastewater by adsorption onto an Iranian sepiolite

Kinetics and thermodynamics of zinc removal from a metal-plating wastewater by adsorption onto an Iranian sepiolite

Biosorption of lead(II) and chromium(VI) on groundnut hull: Equilibrium, kinetics and thermodynamics study

Structural Properties of Synthetic Na-Hectorite Exchanged with Heavy Metals

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