Adsorption of Cd(II) ions from aqueous solutions using activated carbon prepared from olive stone by ZnCl2 activation

Kula, İbrahim; Uğurlu, Mehmet; Karaoğlu, Hamdi; Çelik, Ali

doi:10.1016/j.biortech.2007.01.015

Cited by 355 publications

(134 citation statements)

References 37 publications

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“…The positive value of ΔS° indicates an increase in the randomness at the solid/solution interface during the adsorption of the metal ion onto the ARH and L-214. The results are in good agreement with those of other base metal ions adsorbed onto ARH 24 and L-214 25 .…”

Section: Arh L-214supporting

confidence: 79%

“…Thermodynamic parameters for this adsorption process, such as enthalpy change (ΔH°), entropy change (ΔS°), and the free energy of specific adsorption (ΔG°), was calculated using the following equations 24 :…”

Section: Investigation Of Adsorption Thermodynamicsmentioning

confidence: 99%

“…The value of ΔH°2 98 K for the gold adsorption onto the ARH and L-214 are calculated to be 84.14 and 42.65 kJ/mol, respectively. In order to calculate the activation energy, the following formula has been employed 24 :…”

Section: Arh L-214mentioning

confidence: 99%

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Studies of Gold Adsorption from Chloride Media

et al. 2015

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In this paper, adsorption of gold from chloride media using commercial sorbent ) and biomass residue (rice hull (RH)) were investigated. The different adsorption parameters, sorbent dosage, contact time, temperature and pH of solution on adsorption (%) were studied in detail on a batch sorption. Before the RH was activated, adsorption (%) was poor compared with L-214. However, after the RH was activated at 1000 °C under an argon atmosphere, the gold adsorption (%) increased four-fold. X-ray fluorescence (XRF) was used to explore the feasibility this material as an adsorbent for the removal of gold from aqueous solutions. The adsorption equilibrium data were best fitted with the Langmuir isotherm model. The maximum adsorption capacities, Q max , at 25 °C were found to be 93.46 and 108.70 mg/g for the activated rice hull (ARH) and L-214, respectively. Thermodynamic calculations using ΔH°, ΔS°, ΔG° and E a values indicate that the adsorption process was spontaneous and endothermic.

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Section: Arh L-214supporting

confidence: 79%

Section: Investigation Of Adsorption Thermodynamicsmentioning

confidence: 99%

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Studies of Gold Adsorption from Chloride Media

et al. 2015

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“…Thermodynamic parameters for this uptake process, such as enthalpy change (∆H°), entropy change (∆S°), and the free energy of specific adsorption (∆G°), was calculated using the following equations 24,28,29 :…”

Section: Investigation Of Adsorption Thermodynamicsmentioning

confidence: 99%

Platinum uptake from chloride solutions using biosorbents

2013

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Present work investigates platinum uptake from synthetically prepared, dilute platinum-bearing solutions using biomass residues, i.e. pistachio nut shell and rice husk, which are abundant in Turkey, and provides a comparison between these two biosorbents. Effects of the different uptake parameters, sorbent dosage, contact time, temperature and pH of solution on platinum uptake (%) were studied in detail on a batch sorption. Before the pistachio nut shell was activated, platinum uptake (%) was poor compared to the rice husk. However, after the pistachio nut shell was activated at 1000 °C under an argon atmosphere, the platinum uptake (%) increased two-fold. The pistachio nut shell (original and activated) and rice husk were shown to be better than commercially available activated carbon in terms of adsorption capacity. These two sorbents have also been characterized by FTIR and SEM. Adsorption equilibrium data best complied with the Langmuir isotherm model. Maximum adsorption capacities, Q max , at 25 °C were found to be 38.31 and 42.02 mg.g -1 for the activated pistachio nut shell and rice husk, respectively. Thermodynamic calculations using the measured ∆H°, ∆S° and ∆G° values indicate that the uptake process was spontaneous and endothermic. The experimental data were shown to be fit the pseudo-second-order kinetic model.

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“…Besides the classical waste-water treatments, biosorption of heavy metals is an alternative technique, primarily because it utilizes inactive dead biological materials as sorbents which are generally available at low cost, non hazardous and abound in nature (Veglio and Beolchini, 1997;Volesky, 2001). In the last years, certain raw waste products from industrial or agricultural operations i.e., pine bark (Al-Asheh and Duvnjak, 1998), grape stalks (Villaescusa et al, 2004), crop milling waste (Saeed et al, 2005;Krim et al, 2006;Kula et al, 2008) have been tested for decontamination of metal-containing effluents.…”

Section: Introductionmentioning

confidence: 99%

Kinetics and Thermodynamics of Cd(II) Ions Sorption on Mixed Sorbents Prepared from Olive Stone and Date Pit from Aqueous Solution

Babakhouya¹

2010

American Journal of Environmental Sciences

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Problem statement:The aim of this study is to remove Cd(II) ions from aqueous solutions by adsorption. Mixed sorbent prepared from olive stone and date pit, an agricultural solid by-product was used as adsorbent. Approach: The adsorption experiments of Cd(II) onto the mixture of olive stone and date pit were conducted at different parameters such as, percent of olive stone and date pit in the mixture, temperature, initial solution pH and initial Cd(II) concentration. Adsorption isotherms were obtained at different percent of olive stone and date pit in the mixture. Results: This adsorption data was fitted with the Langmuir. Kinetic studies revealed that the initial uptake was rapid and equilibrium was established in 20 min for all the studied metals and that the data followed the pseudosecond order reaction. The thermodynamic of Cadmium sorption on the mixed sorbent follows the Langmuir model and the sorption capacity for cadmium increases when we add a small amount of olive stone at date pits (90% of date pits in mixture and 10% of olive stone) and a small amount of date pits at olive stone (90% of olive stone and 10% of date pits in mixture. In addition, the thermodynamic parameters, standard free energy (∆G°), standard enthalpy (∆H°) and standard entropy (∆S°) of the adsorption process were calculated. The sorption of Cd(II) onto the mixture of olive stones and dates pit is spontaneous and presents an endothermic nature. The characteristics of the mixture were determined by the analysis of infra red spectral analysis. Conclusion: The results show that the mixture sorbent from olive stone and date pit is an alternative low-cost adsorbent for removing Cd(II).

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Adsorption of Cd(II) ions from aqueous solutions using activated carbon prepared from olive stone by ZnCl2 activation

Cited by 355 publications

References 37 publications

Studies of Gold Adsorption from Chloride Media

Studies of Gold Adsorption from Chloride Media

Platinum uptake from chloride solutions using biosorbents

Kinetics and Thermodynamics of Cd(II) Ions Sorption on Mixed Sorbents Prepared from Olive Stone and Date Pit from Aqueous Solution

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