Defluoridation of Aqueous Solution Using Thermally Activated Biosorbents Prepared from Adansonia digitata Fruit Pericarp

Table 2

Desorption and resorption of fluoride by TAADFPs activated at 450, 500, 550, and 600°C using distilled water and 0.1 M NaCl (pH 5, initial fluoride concentration 5 mg/L, contact time 1 hour at room temperature).

TAADFPs activated at (°C)	First cycle			Second cycle			Third cycle
	F^- resorbed (mg/L)	F^- desorbed (mg/L)	Percent removal (%)	F^- resorbed (mg/L)	F^- desorbed (mg/L)	Percent removal (%)	F^- resorbed (mg/L)	F^- desorbed (mg/L)	Percent removal (%)
450	4.31	3.92	86	4.25	3.80	85	3.52	3.10	70
500	4.34	3.94	87	4.32	3.55	86	4.14	3.45	82
550	4.46	4.21	89	4.39	3.85	88	4.25	3.64	85
600	4.58	4.32	92	4.35	4.13	87	4.26	3.95	85