Table 2.

The effect of pH for adsorption of lead (II) ions using CaSiO₃.

Initial conc. (mg/L)	Contact time (min)	Dosage (g)	pH	Test 1 Ce1	Test 2 Ce2	Average concentration Ce av (mg/L)	Adsorption capacity qe (mg/g)	Removal efficiency (%)
70	108	0.76	2	38.658	39.901	39.7	2.707	33.83
70	108	0.76	4	21.779	22.801	20.8	5.226	99.35
70	108	0.76	6	7.7289	7.912	6.73	7.103	88.78
70	108	0.76	8	2.124	2.1234	1.125	7.85	56.12
70	108	0.76	10	6.522	5.7184	5.62	7.25	12.63
70	108	0.76	12	10.498	11.502	11.4	6.48	5.32