Thermodynamic studies of Ni(II) adsorption onto bentonite from aqueous solution

Tahir, S.S.; Ullah, Shafqat

doi:10.1016/s0021-9614(03)00153-8

Cited by 228 publications

(106 citation statements)

References 15 publications

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“…Therefore, the coverage of the surface may be as uniform as observed for planar molecules. The HOMO-LUMO energy gap (Table 7) shows that DEA is an efficient inhibitor [34] which is also observed by the experimental inhibitor efficiency at 303 K. The value of dipole moment indicates the possibility of adsorption of the DEA by electron donation in the inhibition process. The negative charges on nitrogen and oxygen atoms also show the possibility of adsorption through the nitrogen atom and oxygen atoms.…”

Section: Quantum Studiessupporting

confidence: 66%

The Inhibitory Effect of Diethanolamine on Corrosion of Mild Steel in 0.5 M Sulphuric Acidic Medium

Singh¹,

Bhrara²,

Singh³

2007

Port. Electrochim. Acta

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The inhibitory effect of diethanolamine (DEA) on corrosion of mild steel in 0.5 M H 2 SO 4 was investigated by various corrosion monitoring techniques. Galvanostatic polarization study revealed that this compound is a very good inhibitor. The inhibition efficiency (I%) varies in the range of 88.7% to 55.3 % for a concentration range of 10 -3 M to 10 -7 M at 303 K, respectively. A study of corrosion potential (E corr ) reveals that DEA is a mixed type inhibitor. DEA inhibited mild steel corrosion due to physical adsorption of the inhibitor on the metal surface. The study at higher temperatures indicates that the inhibition efficiency decreases with the increase in temperature. The adsorption of DEA on the mild steel surface in 0.5 M H 2 SO 4 follows the Frumkin's adsorption isotherm. The results of potentiostatic polarization study revealed that DEA is a strong passivating additive. The results of infra red (IR) spectroscopy, scanning electron microscopy (SEM) and quantum chemical study supplement the results of the electrochemical techniques.

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Section: Quantum Studiessupporting

confidence: 66%

The Inhibitory Effect of Diethanolamine on Corrosion of Mild Steel in 0.5 M Sulphuric Acidic Medium

Singh¹,

Bhrara²,

Singh³

2007

Port. Electrochim. Acta

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“…Hence, the simple, effective, low cost and eco-friendly techniques are required for the fine tuning of effluent wastewater treatment. The search for low cost, and easily available adsorbents has led to the investigation of materials of agricultural and biological origin, alongside those of industrial by-products as adsorbents for removal of heavy metals [13][14][15][16][17]. Examples of such low cost adsorbents are clay [18], cotton [19], wool fiber [20], tea leaves [21] and other materials [22][23][24][25].…”

Section: Introductionmentioning

confidence: 99%

<b>Removal of lead(II) ions from aqueous solutions using activated carbon from <i>Militia ferruginea</i> plant leaves</b>

Mengistie

Rao

Singanan

2008

Bull. Chem. Soc. Eth.

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ABSTRACT. The adsorption of lead(II) on to activated carbon developed from an indigenous Ethiopian medicinal plant leaves namely Birbira (Militia ferruginea) was investigated to assess the possible use of this adsorbent. The influences of contact time, adsorbent dose, Pb(II) concentration, pH and temperature on adsorption were investigated. The maximum adsorption took place at 3 h. at a dose of 4.0 g of adsorbent, and 97.3 % of Pb . The percentage of adsorption had increased with the increasing temperature. The positive value of ∆H indicated that the adsorption of lead ions on the adsorbent was an endothermic process. The values of free energy (∆G) were negative as expected for a spontaneous process. The decrease in ∆G value with increasing temperature revealed that adsorption of the ion on the adsorbent became favorable at a higher temperature. The calculated value of ∆H was 25.05 kJ mol -1 , ∆S was 135.48 JK -1 mol -1 and ∆G was also calculated for each temperature. The two theoretical adsorption isotherms, namely, Langmuir and Freundlich were used to describe the experimental results. The Freundlich adsorption isotherm best fits and adsorption capacity was calculated to be 3.3 mg of Pb(II) per g of adsorbent. The adsorption followed the first order kinetics and was found to be pH dependent being maximum at pH 4.0. The pH effect and desorption studies showed that ion exchange mechanism might be involved in the adsorption process. Reuse of the desorbed bio-adsorbent is possible. The effect of foreign ions on the removal of Pb(II) has been investigated. The removal of Pb(II) from industrial wastewater sample was also tested and showed that more than 97 % removal was possible. The results showed that activated carbon prepared from Birbira (Militia ferruginea) leaves could be used for the removal of Pb(II) from wastewater.

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“…The adsorption process of metal ions can be summarized by the following reversible process, which represents a heterogeneous equilibrium (Tahir et al 2003). The apparent distribution coefficient (K d ) of the adsorption is defined as …”

Section: Thermodynamic Studiesmentioning

confidence: 99%

Recovery of Nickel (Ii) Ions from Electroplating Rinse Water Using Hectorite Clay

Ramamurthi¹,

Priya²,

Saranya³

et al. 2009

MAS

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This paper describes the recovery of Ni (II) from electroplating rinse water using the Hectorite clay. Batch mode adsorption experiments were carried out and the effect of contact time, adsorbent dosage, pH, initial metal ion concentration and temperature were studied. Different isotherms were obtained using nickel electroplating rinse waters of various concentrations. The ion exchange process follows second order kinetics and langmuir isotherm. The paper discusses thermodynamic parameters, including changes in Gibbs free energy, entropy and enthalpy for the ion-exchange of Ni (II) from electroplating rinse water on Hectorite clay, revealed that the ion-exchange process was spontaneous and exothermic under different temperatures. The maximum adsorption capacity obtained was 62.24 mg/g at pH 7-8, the optimum adsorbent dosage and contact time was found to be 2 g/l within 5hours.

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Thermodynamic studies of Ni(II) adsorption onto bentonite from aqueous solution

Cited by 228 publications

References 15 publications

The Inhibitory Effect of Diethanolamine on Corrosion of Mild Steel in 0.5 M Sulphuric Acidic Medium

The Inhibitory Effect of Diethanolamine on Corrosion of Mild Steel in 0.5 M Sulphuric Acidic Medium

<b>Removal of lead(II) ions from aqueous solutions using activated carbon from <i>Militia ferruginea</i> plant leaves</b>

Recovery of Nickel (Ii) Ions from Electroplating Rinse Water Using Hectorite Clay

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