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Removal of Fe(II) from Aqueous Solutions by Corchorus olitorius Stem Biochar as a Cost-Effective Biosorbent |
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PP: 117-131 |
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doi:10.18576/ijtfst/150109
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Author(s) |
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Ahmed A.I. Abd-Ellatif,
Mohamed N. Rashed,
Mohamed A.M. Raslan,
Salah G.A. Ali,
Gomaa A.M. Ali,
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Abstract |
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| This study used Corchorus olitorius stem biochar (COSB) as a biosorbent with a high specific surface area (88.2 m2/g) to remove Fe(II) at a reasonable cost. To identify the most effective Fe(II) removal method, a variety of removal parameters were investigated, including the pH, adsorbent dose, contact period, and initial Fe(II) concentration. The fitted equilibrium data were precisely characterized and analyzed using the Freundlich, Temkin, Langmuir, and Dubinin- Radushkevich models. Langmuir isotherm model R2 (0.9907), which has a maximum saturated monolayer sorption capacity of 83.33 mg/g, was found to well represent the developed method. The adsorption process followed pseudo-second-order kinetics, as demonstrated by the high value of R2 (0.9977) and the good agreement between the experimental value of qe (43.5 mg/g) and the calculated value of qe (47.17 mg/g). The adsorption process was conducted at different temperatures to evaluate the influence of temperature on the thermodynamic parameters. The spontaneity of the process is demonstrated by consistently negative values of ΔGo over a broad temperature range. The adsorption process was observed to be endothermic (ΔHo = +18.76 kJ/mol). The positive value of ΔSo suggests an increase in randomness at the solid/solution interface of Fe(II) with the adsorbent. The experimental results showed that COSB had a remarkable effect on Fe(II) removal from aqueous solutions. |
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