Photocatalytic Processes for the Removal of Dye - Green Chemistry for Dyes Removal from Wastewater - page 123

Biological
processes:
Green algae
(Cosmarium
species)

Malachite
green

Dye concentration,
algal concentration,
solution pH, and
temperature;

i) dye decolorization rate is
described with Michaelis-
Menten model;
ii) optimum pH is 9;
temperature (5-45 C)
has positive efect on
decolorization rate;
iii) optimal kinetic parameters:
v max (maximum specific
decolorization rate) is 7.63
mg dye g cell -1 h -1 and K m
(dissociation constant) is
164.57 ppm;

Advantages: alga are
available all over
world in diferent
kinds of habitats,
good capability
for verity of dye
decolorization,
economically
feasible, publicly
acceptable process;
Disadvantages: slow
process, needs to be
performed under
optimal favorable
conditions;

(9, 10)

Activated carbon
(AC) adsorption

Methylene
blue,
basic red
22, basic
yellow 21

AC surface area,
surface chemistry,
pore structure;
adsorbent dose,
and solution pH;

i) three adsorption isotherm
models (Langmuir,
Freundlich and Redlich-
Peterson) have been used,
Redlich-Peterson model
gave best it;
ii) alkaline pH and low pore
size of AC favored dye
adsorption;

Advantages: very
efective adsorbent,
high adsorption
capacity;
Disadvantages: non-
destructive process,
AC regeneration is
very expensive;

(9, 11)

( Continued )