Studies on adsorption of mercury from aqueous solution on activated carbons prepared from walnut shell

Zabihi, Mohammad; Asl, Ali Haghighi; Ahmadpour, Ali

doi:10.1016/j.jhazmat.2009.09.044

Cited by 160 publications

(69 citation statements)

References 36 publications

(42 reference statements)

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“…Activated carbons have several advantages that include; (1) hydrophobicity, (2) high surface area, (3) flexible surface, and (4) low cost [19,28]. Different inexpensive raw materials such as olive stones [20], walnut shells [29], almond shells [30], wood [31], hazelnut shells [32], and apricot shells [33] can be used to prepare activated carbons. Physical and chemical activation methods are utilized to prepare activated carbons that use carbon dioxide or water vapor and chemical agents such as ZnCl 2 , KOH, H 3 PO 4 as activation agents [34].…”

Section: Introductionmentioning

confidence: 99%

Preparation, characterization and kinetic behavior of supported copper oxide catalysts on almond shell-based activated carbon for oxidation of toluene in air

et al. 2014

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Dispersed copper oxide nano-catalysts supported on almond shell-based activated carbon were prepared for catalytic oxidation of toluene in air. The response surface methodology was used to express the catalyst removal efficiency in terms of catalyst metal loading and calcination temperature. Catalyst activity increased with both increasing calcination temperature and metal loading. Calcination temperature had a significant effect on the catalyst activity only at high metal loadings. Two different catalyst preparation methods were employed to investigate the effect of impregnation technique on the deposition-precipitation method. Well-dispersed nano catalysts with higher efficiency towards oxidation of toluene were prepared by the heterogeneous depositionprecipitation (HDP) as compared with the combined impregnation and deposition-precipitation method. The support and catalyst properties were determined by X-ray diffraction, Transmission electron microscopy, fieldemission scanning electron microscope, Boehm test, Brunauer-Emmett-Teller surface area measurements, and energy-dispersive X-ray spectroscopy. Characterization analyses and reaction experiments indicated the antonym effect of impregnation method on the deposition-precipitation method for catalyst preparation. Two types of crystallite (large and small) were formed on the support as a consequence of using the combined catalyst preparation method. Kinetic models were proposed for oxidation of toluene using copper oxide catalysts prepared by the HDP method. The kinetic study indicated that an Eley-Rideal mechanism could adequately describe the kinetic behavior of toluene oxidation.List of symbols C 0 Inlet feed concentration (ppm) C e Exit gas concentration (ppm) D Mean crystallite diameter (nm) K Dimensionless shape factor = 0.9 k X-ray wavelength BLine broadening at half maximum intensity H Bragg angle X T Steady state conversion of the toluene W Weight of catalyst loaded in reactor (g) M Inlet molar flow rate of toluene (mol/s) r Rate of toluene oxidation (mol/g s) Error Objective function of GA methodology for estimating kinetic constants was the absolute error E Activation energy (kJ/mol) DH Adsorption enthalpy (kJ/mol) R Gas constant (J/mol K) R 2

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Section: Introductionmentioning

confidence: 99%

Preparation, characterization and kinetic behavior of supported copper oxide catalysts on almond shell-based activated carbon for oxidation of toluene in air

et al. 2014

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“…Adsorption processes have been widely used in water and wastewater related industries. Removal of heavy metals [13,14] and organic pollutants [15] are applications as such. Moreover, various types of adsorbents were utilized for the adsorption of radionucleic wastes and strontium ions including natural and synthetic zeolites [16], moss as a phytosorbent [17], multiwall carbon nanotubes (MWCNT)/iron oxide magnetic composites [18], activated carbon [19], composite of magnetic particle [20], clinoptilolite [21], and kaolinite [22].…”

Section: Introductionmentioning

confidence: 99%

Effect of adsorbents and chemical treatments on the removal of strontium from aqueous solutions

Ahmadpour

Zabihi

Tahmasbi

et al. 2010

Journal of Hazardous Materials

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113

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“…The pH of aqueous solution is the most important parameter in the adsorption process [10]. Adsorption of cadmium cations onto Acacia tortilis seeds as a function of pH is presented in Table II.…”

Section: B Influence Of Initial Phmentioning

confidence: 99%

Acacia Tortilis Seeds as a Green Chemistry Adsorbent to Clean up the Water Media from Cadmium Cations

Ackacha¹,

Meftah²

2014

IJESD

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Abstract-The potential use of Acacia tortilies seeds as a new green chemistry adsorbent to reduce cadmium cations from water was evaluated through batch experiments. The Acacia tortilies seeds were characterized by determination of solubility in water and determination of surface area and pore volume as well as determination of cellulose content. The important parameters which affect the adsorption process, such as initial pH, contact time and contact temperatures were studied. The maximum adsorption capacity occurs at pH 3.4 after 2 hours. Two isotherm models include Langmuir and Freundlich were investigated. The maximum adsorption capacity obtained were 706, 807and 1004 mg/g at 293, 303 and 323 K, respectively. Experimental data were also performed to the first-order, pseudo-second order and intra-particle diffusion kinetic models. The results indicated that the adsorption of cadmium cations onto Acacia tortilies seeds followed well second-order kinetics. Thermodynamic parameters,  Gº ,  Hº and  Sº indicated the cadmium cations sorption to be endothermic and spontaneous with increase randomness at solid-solution interface. The adsorption mechanism of cadmium cations onto Acacia tortilies seeds was interpreted. A comparison between adsorption capacity of Acacia tortilies seeds and adsorption capacities of other low cost adsorbents were presented. It was found that, the adsorption capacity of Acacia tortilies seeds was higher than the adsorption capacities of all other low cost adsorbents indicated in this research.

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Studies on adsorption of mercury from aqueous solution on activated carbons prepared from walnut shell

Cited by 160 publications

References 36 publications

Preparation, characterization and kinetic behavior of supported copper oxide catalysts on almond shell-based activated carbon for oxidation of toluene in air

Preparation, characterization and kinetic behavior of supported copper oxide catalysts on almond shell-based activated carbon for oxidation of toluene in air

Effect of adsorbents and chemical treatments on the removal of strontium from aqueous solutions

Acacia Tortilis Seeds as a Green Chemistry Adsorbent to Clean up the Water Media from Cadmium Cations

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