Arsenic Removal from Water Using Industrial By-Products

Table 4

Comparative evaluation of various industrial by-products as adsorbents for arsenic removal.

Adsorbent	pH	Concentration/range	Surface area; (m^2/g)	Temperature; (°C)	Model used to calculate adsorption capacity	Capacity (mg/g)		Reference
						As(III)	As(V)
Bauxsol	4.5	0.80–31.0 mM	—	23	Langmuir	—	1.081	[18]
Red mud	3.5 As(III); 7.25 As(V)	33.37–400.4 µmol/L	—	25	Langmuir	0.884	0.941	[19]
Rice husks	6.5	100 µg/mL	—	20	Column	0.020	0.007	[20]
Orange juice residue	7–11 As(III) 2–6 As(V)	—	—	30	Langmuir	70.43	67.43	[21]
Pine wood char	3.5	10–100 µg/L	2.73	25	Langmuir	0.0012	—	[22]
Oak wood char	3.5	10–100 µg/L	2.04	25	Langmuir	0.006	—	[22]
Oak bark char	3.5	10–100 µg/L	25.4	25	Langmuir	0.0074	—	[22]
Fe(III)/Cr(III) hydroxide waste from cooling water systems	4.0	20–100 mg/L	—	32	Langmuir	—	11.02	[23]