The adsorption of Cu(II) ions on bentonite—a kinetic study

Al‐Qunaibit, Maha; Mekhemer, W. K.; Zaghloul, Ahmed

doi:10.1016/j.jcis.2004.09.022

Cited by 114 publications

(49 citation statements)

References 23 publications

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“…The subsequent slow adsorption process is attributed to the longer diffusion range of Pb(II) into the innersphere of Mg 2 Al LDH or the ion-exchange in the inner surface of Mg 2 Al LDH. Such slow diffusion will lead to a slow increase in the adsorption curve at later stages [28]. Moreover, the initial rapid adsorption may be because of an increased number of available sites at the initial stage.…”

Section: Characterizationmentioning

confidence: 99%

The adsorption of Pb(II) on Mg2Al layered double hydroxide

Zhao

Sheng

et al. 2011

Chemical Engineering Journal

265

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Section: Characterizationmentioning

confidence: 99%

The adsorption of Pb(II) on Mg2Al layered double hydroxide

Zhao

Sheng

et al. 2011

Chemical Engineering Journal

265

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“…Bentonite is considered as a main alternative in the decontamination and treatment of detrimental metal ions (Tsai et al 2001;Al-Qunaibit et al 2005;Kaya and Ören 2005;Tahir and Naseem 2004). The adsorption of metal ions on bentonite has been extensively studied in recent years (Caglar et al 2009;Hefne et al 2008;Inglezakis et al 2007;Xu et al 2006;Sato 1998).…”

Section: Introductionmentioning

confidence: 99%

Removal of Cu2+ and Cd2+ from Aqueous Solution by Bentonite Clay Modified with Binary Mixture of Goethite and Humic Acid

Olu-Owolabi

Popoola

Unuabonah

2010

Water Air Soil Pollut

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Pre-modification of bentonite clay with goethite, humic acid, and a binary mixture of goethite and humic acid reagents increased its cation exchange capacity from 95 to 105.32, 120.4, and 125.8 meq/ 100 g of bentonite clay, respectively. The effective pre-modification of bentonite clay with goethite, humic acid, and goethite-humic acid reagents was confirmed from their Fourier transform infrared spectra which suggested that modification was effective on the AlAlOH and Si-O sites for goethite and humic acid modification and AlAlOH for goethitehumic acid modification. The presence of 0.001 M NaNO 3 electrolyte increased the adsorption capacity of bentonite clay. Temperature was observed to favor the adsorption of Cu 2+ and Cd 2+ onto both the raw and modified bentonite clay samples. The goethitehumic acid-modified bentonite gave the best adsorption capacity of ≈10 and 16 mg/g at 30 and 50°C, respectively, for both metal ions. The inner sphere complexation mechanism was suggested for the adsorption of both metal ions onto the modified adsorbents. Modifying bentonite clay with a binary mixture of goethite and humic acid reduced the selectivity of bentonite clay for either Cu 2+ or Cd 2+ . Preadsorbed goethite and humic acid on bentonite clay will further reduce the mobility of heavy metal ions in soils and in aquatic environments.

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“…Al-Qunaibit et al (2005) increased the ionic strength of the solution used considerably to 1 molal when studying sorption of copper to bentonite. Wehrli et al (1990) lowered the pH when sorption of vanadium and chromium to aluminium oxide was studied.…”

Section: Resultsmentioning

confidence: 99%

Kinetic evaluation of sorption and desorption

2010

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Sorption is often quantified by a distribution coefficient, K d , which is the equilibrium ratio between species sorbed to the rock and species in solution. Traditionally K dvalues are determined in batch experiments from equilibrium concentrations.In this work we describe an approach to determine rate constants for sorption and desorption from data obtained in ordinary batch sorption experiments. By varying the surface area to solution volume ratio in experiments where the dynamics for sorption equilibration is monitored, the rate constants (and consequently the K d -value, which is the quota between forward and backward reactions) can be determined.To demonstrate the method, sorption of strontium to crushed granite was studied. The K d -value obtained with the kinetic approach was in good agreement with that obtained from equilibrium concentrations.

show abstract

The adsorption of Cu(II) ions on bentonite—a kinetic study

Cited by 114 publications

References 23 publications

The adsorption of Pb(II) on Mg2Al layered double hydroxide

The adsorption of Pb(II) on Mg2Al layered double hydroxide

Removal of Cu2+ and Cd2+ from Aqueous Solution by Bentonite Clay Modified with Binary Mixture of Goethite and Humic Acid

Kinetic evaluation of sorption and desorption

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