Table 2. Contents of elements (C, O, S, Zn, I, Ca, Na and K) in the fresh adsorbent.

Elements	Raw CAC (wt.%)	ZnAc2–CAC (wt.%)	KOH–CAC (wt.%)	KI–CAC (wt.%)	CuSO4–CAC (wt.%)	Na2CO3–CAC (wt.%)
C	80.56	90.18	90.69	84.72	81.34	88.27
O	5.21	3.62	5.52	0.43	7.93	6.95
Cu	0.22	0.08	0	0.52	0.28	0.04
Zn	0.29	4.37	0.39	0.76	0.42	0.02
Na	0.04	0	1.78	0	0	2.91
S	1.13	0.21	0.31	1.02	0.71	0.42
K	6.24	0.47	0.69	3.41	6.81	0.71
Ca	3.19	0.25	0.16	0.44	0.58	0.17