Eggshell-Derived Nanohydroxyapatite Adsorbent for Defluoridation of Drinking Water from Bofo of Ethiopia

Table 3

vs. final pH of the adsorbent perfumed on 2 g HA, 10 mg/L of fluoride concentration, and 5 hr contact time.

Initial pH	2	3	4	5	6	7	8	9	10	11
Final pH	2.90	3.60	4.50	5.40	6.30	7.21	7.90	8.30	8.90	9.86
Change in pH	0.90	0.60	0.50	0.40	0.30	0.21	0	-0.7	-1.1	-1.14