Table 1.

The comparison between the adsorption capacities of similar adsorbents developed in the treatment processes of aqueous solutions containing Orange II.

Adsorbent	qm, mg/g	References
HDTMA coated zeolite	33.9	Jin et al., 2014
DMDOA-palygorskite (100% CEC equivalent modification)	38.61	Sarkar et al., 2011
2% Hexadecylammonium bromide (HDTMA)-modified zeolite	3.38	Jin et al., 2008
Spent brewery grains	28.54	Silva et al., 2004
Bottom ash	13.24	Gupta et al., 2006
LDH-R	35.75	Present paper
LDH-W	42.5