Bone char from an invasive aquatic specie as a green adsorbent for fluoride removal in drinking water

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In this study, bone chars were obtained from an alien aquatic species “devilfsh” bones by pyrolysis of 500–800 °C. Bone chars were evaluated as a sustainable adsorbent of fuoride, and it was found pyrolyzed bone char at 500 °C adsorbed the most amount of fuoride. Thermodynamic parameters of fuoride adsorption on devilfsh bone chars were estimated as ΔH°=7.213 kJ mol−¹, ΔG°=23.61 kJ mol−¹, and ΔS°=103.4 J mol−¹ K−¹ indicating that adsorption is endothermic, spontane ous, and with a great afnity of fuoride on bone char. The fuoride desorption study showed that fuoride is desorbed from the material of 0.24 to 20.06%, so the adsorption is considered to be partly reversible. The regeneration of the bone char at 400, 500, and 600 °C was studied, and it was noted that its adsorp tion capacity decreases slightly, so it could be con sidered appropriate for the use in water treatment technologies. Adsorption of fuorides from drinking well water of a rural community with dental fuorosis problems and high levels of fuoride in water revealed that by increasing the amount of the bone char of 0.05 to 0.8 g, the disposal of fuoride increases from 69.1 to 98.7%. Lastly, it was established that the bone char synthesized from devilfsh is a low-cost, viable, sus tainable material to remove fuorides from water and represents an environmental management strategy of this alien species. eng