Low cost bentonite clay was chemically modified using magnesium chloride in order to enhance its
fluoride removal capacity. The magnesium incorporated bentonite (MB) was characterized by using
XRD and SEM techniques. Batch adsorption experiments were conducted to study and optimize vari-
ous operational parameters such as adsorbent dose, contact time, pH, effect of co-ions and initial fluoride concentration. It was observed that the MB works effectively over wide range of pH and showed a maximum fluoride removal capacity of 2.26 mg g−1 at an initial fluoride concentration of 5 mg L−1, which is much better than the unmodified bentonite. The experimental data fitted well into Langmuir adsorption isotherm and follows pseudo-first-order kinetics. Thermodynamic study suggests that fluoride adsorption on MB is reasonably spontaneous and an endothermic process. MB showed significantly high fluoride removal in synthetic water as compared to field water. Desorption study of MB suggest that almost all the loaded fluoride was desorbed (∼97%) using 1 M NaOH solution however maximum fluoride removal decreases from 95.47 to 73 (%) after regeneration. From the experimental results, it may be inferred that chemical modification enhances the fluoride removal efficiency of bentonite and it works as an effective adsorbent for defluoridation of water.
Link : https://www.researchgate.net/publication/44592308_Magnesium_Incorporated_Bentonite_Clay_for_Defluoridation_of_Drinking_Water
fluoride removal capacity. The magnesium incorporated bentonite (MB) was characterized by using
XRD and SEM techniques. Batch adsorption experiments were conducted to study and optimize vari-
ous operational parameters such as adsorbent dose, contact time, pH, effect of co-ions and initial fluoride concentration. It was observed that the MB works effectively over wide range of pH and showed a maximum fluoride removal capacity of 2.26 mg g−1 at an initial fluoride concentration of 5 mg L−1, which is much better than the unmodified bentonite. The experimental data fitted well into Langmuir adsorption isotherm and follows pseudo-first-order kinetics. Thermodynamic study suggests that fluoride adsorption on MB is reasonably spontaneous and an endothermic process. MB showed significantly high fluoride removal in synthetic water as compared to field water. Desorption study of MB suggest that almost all the loaded fluoride was desorbed (∼97%) using 1 M NaOH solution however maximum fluoride removal decreases from 95.47 to 73 (%) after regeneration. From the experimental results, it may be inferred that chemical modification enhances the fluoride removal efficiency of bentonite and it works as an effective adsorbent for defluoridation of water.
Link : https://www.researchgate.net/publication/44592308_Magnesium_Incorporated_Bentonite_Clay_for_Defluoridation_of_Drinking_Water
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