Lead removal from aqueous solution by natural and pretreated clinoptilolite: Adsorption equilibrium and kinetics

Günay, Ahmet; Arslankaya, Ertan; Tosun, İsmaı̇l

doi:10.1016/j.jhazmat.2006.12.034

Cited by 945 publications

(390 citation statements)

References 56 publications

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“…This indicates a decrease in adsorption, which is attributed due to the lack of available active sites required for the high initial concentration of AB. Similar results have been reported in literature on the extent of removal of dyes, metal ions and carboxylic acids [8]. The optimum initial concentration of AB solution was fixed for various adsorption systems Table 1.…”

Section: Effect Of Initial Concentrationsupporting

confidence: 79%

Agricultural wastes as a low cost adsorbents for the removal of Acid Blue 92 dye: A Comparative study with Commercial activated carbon.

Prasath¹,

Muthirulan²,

Kannan³

2014

IOSRJAVS

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Section: Effect Of Initial Concentrationsupporting

confidence: 79%

Agricultural wastes as a low cost adsorbents for the removal of Acid Blue 92 dye: A Comparative study with Commercial activated carbon.

Prasath¹,

Muthirulan²,

Kannan³

2014

IOSRJAVS

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“…11,12 The effect of converting the zeolite initially to a homoionic form for the removal of heavy metal ions from wastewater has been studied by many authors. [13][14][15][16][17][18][19] These authors pointed out that zeolite in homoionic forms exhibits a significantly increased ability to remove heavy metals from wastewater. NaCl is most often used as the pretreatment agent.…”

Section: Introductionmentioning

confidence: 99%

Equilibrium ion exchange studies of Ni2+ on homoionic forms of clinoptilolite

et al. 2014

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Research ArticleHomoionic forms of clinoptilolite forms, respectively. The positive changes in enthalpy provide an indication that the sorption reaction is endothermic for Ni(II). The Gibbs free energy values were all negative except for Ca 2+ -exchanged clinoptilolite at 298.15 K and 308.15 K, for which the values were positive 3.10 kJ/mol and 0.53 kJ/mol, respectively. The entropy values for Ni 2+ sorption were also positive; values of 0.12 kJ/mol.K, 0.08 kJ/mol.K and 0.14 kJ/mol.K were obtained for the Na + , K + and Ca 2+ forms, respectively. As expected, the enthalpy obtained from the Van't Hoff plot is dependent not only on the metal ion being adsorbed, but also on the ion being displaced. Pretreatment of the zeolite enhances the removal efficiency provided that monovalent ions are used for the pretreatment. Thus clinoptilolite is an effective low-cost absorbent for the removal of Ni 2+ from aqueous solutions.

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“…As seen from Table 8, coefficients gained from the both the pseudo-first-order and pseudo-second-order models, it is evident that the pseudo-second-order-model fits the best. From Table 8, it is obvious that the R 2 values of the pseudo-second-order kinetic model are much higher than that of pseudo-first-order-kinetic-model and it experienced a consistent increase with the concentration compared to the values of the pseudo-first-order kinetic model [55]. Table 8.…”

Section: (9)mentioning

confidence: 91%

Comparative Kinetic Study of Removal of Pb2+ Ions and Cr3+ Ions from Waste Water using Carbon Nanotubes Produced using Microwave Heating

Mubarak

Thobashinni

Abdullah

et al. 2016

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A comparative study of the removal of Pb 2+ ions and Cr 3+ ions was conducted to determine the efficiency of carbon nanotubes (CNTs) produced using microwave heating as an adsorbent in removing heavy metal ions from waste water. Optimization of parameters such as adsorbent dosage, pH value, agitation speed, and agitation time was done using the Design Expert software version 6.0. The statistical analysis revealed that optimized conditions for the highest removal for Pb 2+ are at pH 4.0, CNTs dosage of 0.09 g, agitation time and speed of 50 min and 150 rpm respectively. Meanwhile, the highest removal Cr 3+ ions was observed at pH 8.0, CNTs dosage of 0.09 g, agitation time and speed of 60 min and 150 rpm respectively. For the initial concentration of 2 mg/L, the removal efficiency of Pb 2+ ions and Cr 3+ ions were 99.9% and 95.5% respectively. The maximum adsorption capacities of both Pb 2+ ions and Cr 3+ ions onto the CNT were 15.34 mg/g for Pb 2+ ions and 24.45 mg/g for Cr 3+ ions. Besides that, the Langmuir and Freundlich constants for the removal of Pb 2+ ions were 0.073 and 1.438 L/mg while 0.071 and 1.317 L/mg for Cr 3+ ions. The statistical analysis proved that the removal of Pb 2+ ions and Cr 3+ ions fits the Langmuir and Freundlich isotherm models, and both models obeyed the pseudo-second-order.

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Lead removal from aqueous solution by natural and pretreated clinoptilolite: Adsorption equilibrium and kinetics

Cited by 945 publications

References 56 publications

Agricultural wastes as a low cost adsorbents for the removal of Acid Blue 92 dye: A Comparative study with Commercial activated carbon.

Agricultural wastes as a low cost adsorbents for the removal of Acid Blue 92 dye: A Comparative study with Commercial activated carbon.

Equilibrium ion exchange studies of Ni2+ on homoionic forms of clinoptilolite

Comparative Kinetic Study of Removal of Pb2+ Ions and Cr3+ Ions from Waste Water using Carbon Nanotubes Produced using Microwave Heating

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