4.3 Degradation Mechanism Followed by MoS 2 Based
Composites
Degradation mechanism proposed is a function of material to be degraded and
co-catalyst forming nanocomposite. Few dyes self-degraded on absorption of
energy. Schematic diagrams depicting photocatalytic mechanism are shown in
Figs. 4.3 and 4.4. The absorption ability of dye can be attributed to large surface
area which creates many active zones and improved electron-hole pair separation
Table 4.1 MoS 2 nanocomposites for removal of industrial effluents
Nanocomposite
Morphology
Removal efficiency (%)
References
Coupling
between the
MoS 2 and GO
with g-C 3 N 4
MoS 2 nanosheets dispersed in the CN-M-G
ternary hybrid.
89.5% after 2.5 h Rhodamine B
(RhB) under visible light
irradiation
Hu et al.
(2014)
MoS 2 –GO
Homogeneous dispersion
of MoS 2 in graphene
hydrogel
99% removal of methylene blue
(MB) in 60 min under solar light
Ding et al.
(2015)
TiO 2 / MoS 2
@zeolite
TiO 2 /MoS 2 coated on
surface of zeolite
90% of methyl orange (MO) in
60 min in visible light
W. Zhang
et al.
(2015a)
TiO 2 /MoS 2
Hybrid structure
90% of MO in 10 min in xenon
lamp simulating solar irradiation
W. Zhang
et al.
(2015b)
MoS 2 /g-C 3 N 4
MoS 2 particles dispersed
on surface of layered
g-C 3 N 4
51.67%, higher rate of NO nitric
oxide removal than g-C 3 N 4
nanoparticles
Wen et al.
(2016)
MoS 2 nanosheets
with ZnO–gC 3 N 4
ZnO nanospheres embedded in co-stacked
g-C 3 N 4 /MoS 2 nanosheets
99.50% of MB in 30 min of visible light irradiation,
Jo et al.
(2016)
g-C 3 N 4 /Ag/MoS 2 Flowerlike architecture
9.43-fold increase in degradation
in visible light
Fang
(2017)
MoS 2 /TiO 2
MoS 2 nanosheet encapsulating TiO 2 hollow
spheres
99.35%, reduction of
4-nitrophenol simulated sun light
irradiation
Guo et al.
(2017)
MoS 2 /ZnO
Deposition of ZnO on
MoS 2
80% of Novacron red hunts- man
(NRH) dye after 80 min of light
irradiation
Krishnan
et al.
(2019a)
MoS 2 /Ag
Accumulation of Ag
nanoparticles on MoS 2
77% of Novacron red hunts- man
dye after 80 min of light
irradiation
Krishnan
et al.
(2019a)
SnO 2 /Ag/MoS 2
Flower like nanosheets of
MoS 2 with even distribution of Ag and SnO 2
90% of 2,4-diclorophenol (DCP)
in 20 min. 100% of MB and MO
within 12 min. RhB 100% within
14 min
Khan et al.
(2019)
GO/MoS 2 /gC 3 N 4
MoS 2 well-dispersed in
the ternary system
96.7% towards RhB with good
photostability
Yan et al.
(2019)
4 MoS 2 Based Nanocomposites for Treatment of Industrial Effluents
101
Composites
Degradation mechanism proposed is a function of material to be degraded and
co-catalyst forming nanocomposite. Few dyes self-degraded on absorption of
energy. Schematic diagrams depicting photocatalytic mechanism are shown in
Figs. 4.3 and 4.4. The absorption ability of dye can be attributed to large surface
area which creates many active zones and improved electron-hole pair separation
Table 4.1 MoS 2 nanocomposites for removal of industrial effluents
Nanocomposite
Morphology
Removal efficiency (%)
References
Coupling
between the
MoS 2 and GO
with g-C 3 N 4
MoS 2 nanosheets dispersed in the CN-M-G
ternary hybrid.
89.5% after 2.5 h Rhodamine B
(RhB) under visible light
irradiation
Hu et al.
(2014)
MoS 2 –GO
Homogeneous dispersion
of MoS 2 in graphene
hydrogel
99% removal of methylene blue
(MB) in 60 min under solar light
Ding et al.
(2015)
TiO 2 / MoS 2
@zeolite
TiO 2 /MoS 2 coated on
surface of zeolite
90% of methyl orange (MO) in
60 min in visible light
W. Zhang
et al.
(2015a)
TiO 2 /MoS 2
Hybrid structure
90% of MO in 10 min in xenon
lamp simulating solar irradiation
W. Zhang
et al.
(2015b)
MoS 2 /g-C 3 N 4
MoS 2 particles dispersed
on surface of layered
g-C 3 N 4
51.67%, higher rate of NO nitric
oxide removal than g-C 3 N 4
nanoparticles
Wen et al.
(2016)
MoS 2 nanosheets
with ZnO–gC 3 N 4
ZnO nanospheres embedded in co-stacked
g-C 3 N 4 /MoS 2 nanosheets
99.50% of MB in 30 min of visible light irradiation,
Jo et al.
(2016)
g-C 3 N 4 /Ag/MoS 2 Flowerlike architecture
9.43-fold increase in degradation
in visible light
Fang
(2017)
MoS 2 /TiO 2
MoS 2 nanosheet encapsulating TiO 2 hollow
spheres
99.35%, reduction of
4-nitrophenol simulated sun light
irradiation
Guo et al.
(2017)
MoS 2 /ZnO
Deposition of ZnO on
MoS 2
80% of Novacron red hunts- man
(NRH) dye after 80 min of light
irradiation
Krishnan
et al.
(2019a)
MoS 2 /Ag
Accumulation of Ag
nanoparticles on MoS 2
77% of Novacron red hunts- man
dye after 80 min of light
irradiation
Krishnan
et al.
(2019a)
SnO 2 /Ag/MoS 2
Flower like nanosheets of
MoS 2 with even distribution of Ag and SnO 2
90% of 2,4-diclorophenol (DCP)
in 20 min. 100% of MB and MO
within 12 min. RhB 100% within
14 min
Khan et al.
(2019)
GO/MoS 2 /gC 3 N 4
MoS 2 well-dispersed in
the ternary system
96.7% towards RhB with good
photostability
Yan et al.
(2019)
4 MoS 2 Based Nanocomposites for Treatment of Industrial Effluents
101