Environmental Engineering Reference
In-Depth Information
Table 3.8
Biosorbents, biomass, water hyacinth (
Eichornia crassipes
) and human
hair with dif erent parameter
s.
Adsorbent
pH
Concentration
range
Capacity (mg/g)
As(III) As(V)
Ref.
Chitosan dry water hyacinth
plant leaf
4
g/L
58
[114]
Molebdate-impregnated
chitosan gel beads
-
-
- 200
[116]
Fresh biomass
6
50-200 mg/L
128.1
-
[117]
Penicillium purpurogenum
5
10-750 mg/L
35.6
-
[119]
Biomass
2
1-10 mg/L
13.17 -
[121]
Human hair
-
90-360 μg/L
-
1.80
[125]
of cadmium, lead, mercury and arsenic ions by the Penicillium purpuro-
genum fungus has also been reported [120]. Selective As(III) adsorption
on waste chicken feathers with a high i brous protein content was studied
[121]. h e disuli de bridges present were reduced to thiols by thioglycolate.
h e As(III) adsorption was favored at low pH. Arsenic uptake was 270
μmol As(III)/g of biomass. h e XANES analyses demonstrated that arsenic
is adsorbed in its trivalent state. h is is a major advantage over conven-
tional As uptake, which usually requires a previous oxidation to As(V).
Each adsorbed As atom was directly bound to three S atoms with estimated
As-S distances of 226 pm based on EXAFS analyses. h e results of this
biomass are mentioned in Table 3.8.
3.1.5.13 Water Hyacinth (Eichornia crassipes)
h e water hyacinth (
E. crassipes
) is a member of the pickerelweed family
(
Pontederiaceae
). h e plants vary in size from a few centimeters to over a
meter in height [122]. Water hyacinths (
E. crassipes
) were used as a pollu-
tion monitor for the simultaneous accumulation of arsenic, cadmium, lead
and mercury [123]. Arsenic removal by water hyacinths (
E.crassipes
) was
also reported [124] and tabulated in Table 3.8.
3.1.5.14 Human Hair
Wasiuddin
et al.
[125] examined the ability of human hair to adsorb arse-
nic from contaminated drinking water. Both static and dynamic tests along
with the numerical modeling have been carried out to test human hair as
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