A comparison of the adsorption capacities of various adsorbents for Hg²⁺ ions.

S. no	Adsorbent	q m (mg g−1)	Ref.
1	GACa	20.83	50
2	MNPs-DTCb	47.87	51
3	CSTGc	98	52
4	PANI–PSd composite	148	53
5	Mercaptosuccinic acid–LDHe	161	54
6	PAM/ATPf	192	55
7	Glu@h-ZnOg	233	Current work
8	KMS-2h	297	56
9	KMS-1i	377	57
10	MoS4–LDHj	500	18

^aCarboxymethylated granular activated carbon (GAC).

^bMagnetic nanoparticles (MNPs) of Fe₃O₄ functionalized by dithiocarbamate (DTC).

^cChitosan-thioglyceraldehyde Schiff's base cross-linked magnetic resin (CSTG).

^dPolyaniline–polystyrene composite (PANI–PS).

^eMercaptocarboxylic acid intercalated Mg–Al layered double hydroxide.

^fPolyacrylamide/attapulgite (PAM/ATP).

^gGlutathione-coated hollow ZnO (Glu@h-ZnO).

^hLayered K₂MgSn₂S₆ (KMS-2).

ⁱLayered metal sulfides (KMS-1).

^jLayered double hydroxide intercalated with the MoS₄²⁻ ion.