A Comparative Study on Removal of Hazardous Anions from Water by Adsorption: A Review

Table 1

Adsorption isotherm for arsenic.

Adsorbent	Adsorption capacity		Adsorption isotherm	Initial concentration	References
	Arsenic III	Arsenic V
Zirconium Polyacrylamide hybrid (ZrPACM-43)	0.20 mg/g; 0.80 mg/g		Freundlich	10 mg/L	[14]
Manganese oxide-coated alumina (MOCA)	42.48 mg/g	—	Sips	—	[2]
Nano zerovalent	18.2 mg/g	12 mg/g	Freundlich and Langmuir	—	[3]
MnFe2O4	94 mg/g	90 mg/g	Langmuir	10 mg/L	[42]
CoFe2O4	100 mg/g	74 mg/g	Langmuir	10 mg/L	[42]
Manganese(II, III) oxide (Mn3O4)		101 μg/m^2	Langmuir; Freundlich	1 mg/L	[52]
Activated alumina	0.0545 mg/g	—	Langmuir, Freundlich	0.5 mg/L	[82]
Copper(II) oxide nanoparticles	—	1.0862 mg/g	Langmuir	100 µg/L	[57]
Chitosan-coated biosorbent	56.5 mg/g	96.46 mg/g	Langmuir	100 ppm	[83]
Cellulose-carbonated hydroxyapatite nanocomposites		12.72 mg/g	Langmuir	10 mg/L	[84]
Magnetiteemaghemite nanoparticles	3.69 mg/g	3.71 mg/g	Freundlich	1.5 mg/L	[85]
Polymeric Al/Fe modified montmorillonite	19.11 mg/g	21.23 mg/g	Freundlich	10 mg/L	[86]
Activated alumina grains	—	15.9 mg/g	Langmuir	2.85 and 11.5 mg/L	[87]
Activated alumina grains	3.48 mg/g		Langmuir	0.79 and 4.90 mg/L	[87]
Iron (Fe2O3)	—	0.66 mg/g	Langmuir	200 µg/L	[60]
Aluminum oxide (Al2O3)	—	0.17 mg/g	Langmuir	—	[60]
Oxide-coated sand	0.0411 mg/g	0.0426 mg/g	Langmuir	100 µg/L	[88]
Shirasu-zeolite P1 (-SZP1)	—	65.93 mg/g	Freundlich	—	[89]
Aluminum-loaded Shirasu-zeolite P1 (Al-SZP1)	—	10.47 mg/g	Freundlich	0.13 mM	[89]
Alum-impregnated activated alumina (AIAA)	—	0.0314 mmol/g	Langmuir	1–25 mg/L	[90]
Copper oxide incorporated	2.161 mg/g	2.017 mg/g	Langmuir	—	[91]
Unmodified alumina	0.925 mg/g	0.637 mg/g	Langmuir	—	[91]
Goethite	—	15 mg/g	Langmuir	—	[92]
Jarosite	—	21 mg/g	Langmuir	—	[92]
Iron-coated zeolite (ICZ)	—	0.68 mg/g	Langmuir	—	[93]
Iron-impregnated granular activated carbon	—	0.6 mg/g and 1.95 mg/g	Langmuir	—	[93]
Reclaimed iron oxide-coated sands	6.7–8.7 g/g	—	Langmuir	301 g/L	[94]
Maghemite nanoparticles	—	16.7 mg/g	Langmuir	—	[95]
Acid modified carbon black	—	46.3 mg/g	Langmuir	100 mg/L	[96]
Modified red mud	—	68.5 mg/g	Langmuir	—	[69]
MnO2-modified natural clinoptilolite zeolite	—	1 μg/g	Freundlich	20 µg/L	[97]
Unmodified natural clinoptilolite	—	0.38 μg/g	Freundlich	20 µg/L	[97]
Novel hybrid material	0.25 mg/g		Langmuir	10 mg/L, 50 mg/L, and 100 mg/L	[98]
Synthetic siderite	—	31 mg/g	Langmuir		[99]
Iron oxide-coated fungal biomass	880 μg/g	1080 μg/g	Langmuir	100 g/L	[100]
Cupric oxide nanoparticles	26.9 mg/g	22.6 mg/g	Langmuir isotherm		[101]