Competitive Adsorption of Cadmium(II) and Mercury(II) Ions from Aqueous Solutions by Activated Carbon from Xanthoceras sorbifolia Bunge Hull

Table 2

Global surface composition as determined by EDX analysis.

Sample	C (at.%)	O (at.%)	N (at.%)	P (at.%)	O/C (%)	N/C (%)	P/C (%)
XLAC	80.26	12.92	4.62	2.20	16.1	0.07	0.03
XL	59.41	29.53	3.22	0.07	49.7	0.05	0.001

CONP: contributions (at.%) of carbon, oxygen, nitrogen, and phosphorus; O/C: ratio of oxygen to carbon; N/C: ratio of nitrogen to carbon; P/C: ratio of phosphorus to carbon.