Comparison of adsorption capacities of different adsorbents for arsenic.

S.No	Adsorbents	Adsorption capacity (mg g−1)		References
		As(iii)	As(v)
1	Iron oxide coated hollow PMMA	8.12	10.03	Present study
2	Granular ferric hydroxide (GFH)	—	1.1	61
3	Ultrafine δ-FeOOH	—	37.3	62
4	Magnetite–maghemite nanoparticles	3.69	3.71	63
5	α-Fe2O3	—	0.2	64
6	Fe3O4 nanoparticles	16.56	46.06	65
7	g-Fe2O3 nanoparticles	—	2.9	66
8	Fe3O4-γ-Fe2O3 nanoparticles	3.69	3.71	67
9	Bituminous based Filtrasirb 400	—	2.45	68
10	Modified activated carbons with iron hydro(oxide) nanoparticles	0.035	(Initial total As conc. is 0.31 mg L−1)	69
11	Lignite-based AC	—	0.26 (initial As conc. is 0.12 mg L−1)	70
12	Ferric oxyhydroxides anchored onto activated carbon	26.8	—	71
13	Straw activated carbon	51.3	33.8	72
14	Iron-impregnated granular activated carbon	—	1.95 (initial As conc. is 0.12 mg L−1)	73
15	Sawdust-based AC	—	204	74
16	Fe3O4 coated wheat straw	3.9	8.1	75
17	ZVI nanoparticles modified starch	12.2	14	76
18	Iron loaded orange peel	68.2	68.6	69
19	Coconut shell with 3% ash	—	2.4	77
20	Ce–Ti oxide adsorbent	6.8	7.5	78
21	Char carbon	89	34.46	79
22	Activated bauxsol (red mud)	0.541	7.642	80
23	Empty fruit bunch biochar	18.9	5.5	81
24	Leonardite char	4.46	8.4	82
25	Magnetic Fe3O4 nanoparticles (tea waste)	189	154	83