Adsorptive behavior of L-Arginine-silica micro-particles against arsenic and fluoride in aqueous solution
2022
The occurrence of high concentrations of arsenic and fluoride in drinking water has become a serious environmental issue. The present study reports a novel adsorbent, L-Arg functionalized silica micro-particles and its effectiveness for the simultaneous removal of arsenite, arsenate, and fluoride ions in aqueous solution. Batch adsorption experiments were performed to evaluate the efficiency of removal under the optimum condition of pH, initial concentration, contact time, adsorbent dose, and temperature. Four isothermal models were used to analyze the data: Langmuir, Freundlich, Temkin, and D-R isotherm. With a high correlation coefficient for As (III) (R² = 0.99), As (V) (R² = 0.99), and F⁻ (R² = 0.99), ions, the Langmuir isothermal model fit well. With maximum monolayer adsorption capacity of 18.76 mgg⁻¹, 14.28 mgg⁻¹, and 38.46 mgg⁻¹, respectively. The kinetic analysis in all three cases followed pseudo-second-order, where observed data were in close proximity with experimental data, the thermodynamic parameters indicated that the adsorption process is spontaneous, feasible, and endothermic, where entropy increases at the solid–liquid interface. Thus L-Arg functionalized silica micro-particles could act as a promising candidate for the removal of arsenic and fluoride from potable water.
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