Table 4.

Ppy-based adsorbents for the removal of HMIs.

Adsorbent	Adsorbate	pH	Temperature (°C)	qmax (mg/g)	Ref.
Ppy-PANI	Cr (VI)	2	25	227	[115]
Ppy-oMMT NC	Cr (VI)	2	25	209.6	[94]
Ppy-Chitin	Cr (VI)	2	50	35.22	[95]
Ppy/Fe3O4 and Ppy/oMWCNTs NC	Cr (VI)	2	45, 25	243.9, 294	[96]
Ppy/DABSA	Cr (VI)	2	25	303	[98]
Ppy-gly	Cr (VI)	2	45	232.55	[99]
Ppy/MLS	Cr (VI)	2	25	343.64	[103]
Ppy/Ca-REC	Cr (VI)	1.5	45	833.33	[104]
Ppy-Fe3O4	Hg2+	2.5	55	173.16	[108]
Ppy–BOFS NC	phosphate	2	45	9.13	[116]
Ppy-GSi NC	Cr (VI)	2	25	429.2	[117]