The Improvement of Natural Thai Bentonite Modified with Cationic Surfactants on Hexavalent Chromium Adsorption from an Aqueous Solution

Table 8

Elemental composition (%) of NTB, 1CPC, 1HDTMA, and MTBs after Cr(VI) adsorption.

Elemental composition (K)	Adsorbent
	NTB	1CPC	1HDTMA	1CPC+Cr(VI)	1HDTMA+Cr(VI)
O	51.2	23.9	30.7	33.6	34.3
Ca	25.2	0.9	11.3	1.0	0.1
C	13.1	40.2	35.2	31.9	36.9
Si	7.2	23.6	15.7	24.4	21.2
Al	2.0	6.8	3.0	5.6	4.2
Mg	1.0	1.5	0.6	0.9	0.7
Fe	0.4	1.4	1.9	1.0	0.6
Cl	0.0	1.7	0.0	0.0	0.0
Br	0.0	0.0	1.6	0.0	1.3
Cr	0.0	0.0	0.0	1.0	0.7