Thermodynamic and kinetic investigations of PO3−4 adsorption on blast furnace slag

Oğuz, Ensar

doi:10.1016/j.jcis.2004.08.074

Cited by 98 publications

(58 citation statements)

References 33 publications

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“…The D-R isotherm is more general than the Langmuir isotherm, because it does not assume a homogenous surface or constant sorption potential (Oguz 2005). In order to estimate the characteristic porosity of the adsorbent and the apparent energy of adsorption, the Ni(II) adsorption data were also fitted to the D-R isotherm in the following form (Jnr and Spiff 2005):…”

Section: Dubinin-radushkevich Isothermmentioning

confidence: 99%

Kinetic and equilibrium study of Ni(II) sorption from aqueous solutions onto Peganum harmala-L

Ghasemi

Zahedi

et al. 2014

Int. J. Environ. Sci. Technol.

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In this study, the adsorption behavior of Ni(II) in an aqueous solution system using natural adsorbent Peganum harmala-L was measured via batch mode. The prepared sorbent was characterized by scanning electron microscope, Fourier transform infrared spectroscopy, N 2 adsorptiondesorption and pH zpc . Adsorption experiments were carried out by varying several conditions such as contact time, metal ion concentration and pH to assess kinetic and equilibrium parameters. The equilibrium data were analyzed based on the Langmuir, Freundlich, Temkin and Dubinin-Radushkevich isotherms. Kinetic data were analyzed using the pseudo-firstorder, pseudo-second-order and intra-particular diffusion models. Experimental data showed that at contact time 60 min, metal ion concentration 50 mg/L and pH 6, a maximum amount of Ni(II) ions can be removed. The experimental data were best described by the Langmuir isotherm model as is evident from the high R 2 value of 0.988. The adsorption capacity (q m ) obtained was 68.02 mg/g at an initial pH of 6 and a temperature of 25°C. Kinetic studies of the adsorption showed that equilibrium was reached within 60 min of contact and the adsorption process followed the pseudo-first-order model. The obtained results show that P. harmala-L can be used as an effective and a natural low-cost adsorbent for the removal of Ni(II) from aqueous solutions.

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Section: Dubinin-radushkevich Isothermmentioning

confidence: 99%

Kinetic and equilibrium study of Ni(II) sorption from aqueous solutions onto Peganum harmala-L

Ghasemi

Zahedi

et al. 2014

Int. J. Environ. Sci. Technol.

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“…Phosphate adsorption kinetic data are interpreted by a modified version of the Lagergren equation, which is a pseudo-second order kinetic model, developed by Ho and McKay. [10][11][12] According to this model, the reaction rate is expressed as:…”

Section: Characterization Of the Schwertmannite Samplementioning

confidence: 99%

Magnetic Removal of Phosphate from Wastewater Using Schwertmannite

et al. 2006

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A magnetic filtration has firstly been applied to the phosphate removal from wastewater by using schwertmannite, which is ferric oxyhydroxide sulfate with high capacity of phosphate adsorption. High efficiency of phosphate removal without using magnetic seeding was obtained at magnetic intensities of around 1 Tesla, which means no necessity to use a superconducting magnet. The kinetics data of phosphate adsorption have been found to be fitted well with a pseudo-second-order model and adsorption equilibrium data have been explained by the Langmuir isotherm. The effect of pH on the phosphate adsorption in this process was characterized by zeta potential measurement. It is proposed that ligand exchange is a dominant mechanism responsible for phosphate adsorption on schwertmannite.

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“…Recently, attention has been focused on phosphate adsorbents because of the most economical and applicable of adsorption. Successful results have been obtained using fly ash [5,7,15], aluminum oxide [8][9][10], iron oxide [11][12][13][14], slag [16,17], red mud [18,19], silicates [20,21], activated carbon [22], and gas concrete [23].…”

Section: Introductionmentioning

confidence: 99%

Removal of phosphate from aqueous solution by red mud using a factorial design

Zhao

Wang

Luan

et al. 2009

Journal of Hazardous Materials

123

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a b s t r a c tThe purpose of the work is to study the adsorption of phosphate on red mud from aqueous solutions using 2 3 full factorial designs. The important parameters, which affect the removal efficiency of phosphate and final pH of solution (pH f ), such as phosphate concentration, initial pH of solution (pH i ) and the red mud dosage were investigated. The effects of individual variables and their interaction effects for dependent variables, namely, phosphate removal efficiency and pH f were determined. The results of the study showed that phosphate removal efficiency and pH f were found to be 97.6% and 10.9 with optimal reaction conditions initial phosphate concentration 25 mg l −1 , red mud dosage 1.5 g l −1 , pH i 3.0, respectively. It was found that adequate amount of calcium ions and higher final pH than 9 are ideal conditions for maximum phosphate removal.

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Thermodynamic and kinetic investigations of PO3−4 adsorption on blast furnace slag

Cited by 98 publications

References 33 publications

Kinetic and equilibrium study of Ni(II) sorption from aqueous solutions onto Peganum harmala-L

Kinetic and equilibrium study of Ni(II) sorption from aqueous solutions onto Peganum harmala-L

Magnetic Removal of Phosphate from Wastewater Using Schwertmannite

Removal of phosphate from aqueous solution by red mud using a factorial design

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