Table 6.5 Various oxidants utilized to oxidize As (III) to As (V), and their properties, working
conditions, and efficiencies
Oxidants
Solution
pH
Initial
Concentration
(μg/L)
Type of
Water
Comments
References
Ozone and
oxygen
7.5–8.5
45–62
Ground
water
Ozone method is
very quicker than
unadulterated oxygen/air for oxidizing
As (III). For example, ozone technique takes 20 min
for the complete
oxidation of As (III)
while unadulterated
oxygen and air oxidizes only 57% and
54%, respectively,
after 5 days
Kim and
Nriagu
(2000)
Type of Chlorine 8.3
300
DI
water
The complete oxidation of As(III) to
As(V) occurs by the
addition of active
chlorine material
when its underlying
fixation was more
prominent than
300 ppb (μg/L). The
estimated adsorption capacity was
0.99 mg of Cl 2 /mg
of As (III).
Hu et al.
(2012)
Chlorine dioxide 8.12
50
Ground
water
86% of oxidation
accomplished
within 1hr. This
high value is for the
most part because of
the nearness of certain metals present
in water which
could act as a catalyst and help in oxidizing As (III) to As
(V)
Sorlini and
Gialdini
(2010)
Monochloramine 8.12
50
Ground
water
Longer time is
needed to acquire
complete As (III)
oxidation. Generally, it could oxidize
only 60% of As (III)
even after 18 h of
contact time.
Sorlini and
Gialdini
(2010)
(continued)
158
T. S. Sakthivel et al.
conditions, and efficiencies
Oxidants
Solution
pH
Initial
Concentration
(μg/L)
Type of
Water
Comments
References
Ozone and
oxygen
7.5–8.5
45–62
Ground
water
Ozone method is
very quicker than
unadulterated oxygen/air for oxidizing
As (III). For example, ozone technique takes 20 min
for the complete
oxidation of As (III)
while unadulterated
oxygen and air oxidizes only 57% and
54%, respectively,
after 5 days
Kim and
Nriagu
(2000)
Type of Chlorine 8.3
300
DI
water
The complete oxidation of As(III) to
As(V) occurs by the
addition of active
chlorine material
when its underlying
fixation was more
prominent than
300 ppb (μg/L). The
estimated adsorption capacity was
0.99 mg of Cl 2 /mg
of As (III).
Hu et al.
(2012)
Chlorine dioxide 8.12
50
Ground
water
86% of oxidation
accomplished
within 1hr. This
high value is for the
most part because of
the nearness of certain metals present
in water which
could act as a catalyst and help in oxidizing As (III) to As
(V)
Sorlini and
Gialdini
(2010)
Monochloramine 8.12
50
Ground
water
Longer time is
needed to acquire
complete As (III)
oxidation. Generally, it could oxidize
only 60% of As (III)
even after 18 h of
contact time.
Sorlini and
Gialdini
(2010)
(continued)
158
T. S. Sakthivel et al.