Abstract
The fly ash (FA) and modified tungsten oxide fly ash (MTFA) were used as an adsorbent for the removal of Ni (II) and Zn (II) ion from aqueous solution. The materials were hydrothermally synthesized and characterized using scanning electron microscopy (SEM), Fourier transform infrared spectroscopy (FTIR), and X-ray diffraction (XRD). The adsorption capacities of the materials were found to be 4.797 and 5.930 mg g−1 for Zn (II) and Ni (II) ions respectively under the optimized process conditions (180 min and pH 6 for both metals ions). The kinetics of the adsorption were performed and found that pseudo-second-order kinetic model fitted well with the experiment. The thermodynamic parameters evaluated show that the adsorption process is spontaneous and exothermic.
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Abbreviations
- A :
-
Temkin constants relating to sorption potential (L g−1)
- b :
-
Langmuir constant representing adsorption intensity (Lmg−1)
- B :
-
Temkin constants relating to heat of adsorption
- C o :
-
initial concentration of metal ion in solution (mg L−1)
- C e :
-
equilibrium concentration of metal ion in solution (mg L−1)
- K 1 :
-
pseudo-first-order rate constant (min−1)
- K 2 :
-
pseudo-second-order rate constant (g mg−1 min−1)
- m :
-
mass of the adsorbent (g)
- n :
-
adsorption intensity (g L−1)
- q e :
-
adsorption capacity at equilibrium (mg g−1)
- q m :
-
theoretical saturation capacity (mg g−1)
- q t :
-
adsorption capacity at any time t (mg g−1)
- R 2 :
-
correlation coefficient
- t :
-
contact time (min)
- T :
-
temperature (K)
- V :
-
volume of adsorbate solution (L)
- X m :
-
monomolecular adsorption capacity (mg g−1)
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Greek Letters
∆G°standard Gibbs free energy change
∆H°standard enthalpy change
∆S°standard entropy change
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Kumar, D., Kumaran, C. & Saravanathamizhan, R. Heavy Metal Removal Using Modified Tungsten Oxide Fly Ash. Water Conserv Sci Eng 3, 181–189 (2018). https://doi.org/10.1007/s41101-018-0050-x
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DOI: https://doi.org/10.1007/s41101-018-0050-x