Table 2.

Weight and atom percent before and after of adsorption of lead ions.

	Before lead ion adsorption		After lead ion adsorption
Element	Weight %	Atomic percentage	Weight %	Atomic percentage
C	47.34	53.29	47.55	55.17
N	25.83	24.93	22.91	22.80
O	25.00	21.13	23.99	20.90
P	1.45	0.63	1.99	0.89
Pb	0.38	0.02	3.56	0.24
Total	100.00	100.00	100.00	100.00