Journal of Hazardous Materials,
Journal Year:
2024,
Volume and Issue:
476, P. 134765 - 134765
Published: June 6, 2024
Photocatalytic
membrane
reactors
(PMRs)
are
a
promising
technology
for
micropollutant
removal.
Sunlight
utilization
and
catalyst
surface
sites
limit
photodegradation.
A
poly(vinylidene
fluoride)
(PVDF)
nanofiber
composite
(NCM)
with
immobilized
visible-light-responsive
g-C3N4/Bi2MoO6
(BMCN)
were
developed.
Photodegradation
of
steroid
hormones
the
PVDF-BMCN
NCM
was
investigated
varying
properties,
operating
conditions,
relevant
solution
chemistry
under
solar
irradiation.
Increasing
CN
ratio
(0-65%)
enhanced
estradiol
(E2)
degradation
from
20±10
to
75±7%
due
improved
sunlight
photon
lifetime.
PVDF
nanofibers
reduced
self-aggregation
catalysts.
Hydraulic
residence
time
light
intensity
With
increasing
pH
value,
E2
removal
decreased
84±4
67±7%
owing
electrical
repulsion
thus
adsorption
between
catalysts
E2.
96%
can
be
attained
at
environmentally
feed
concentration
(100
ng.L–1)
flux
60
L.m-2.h-1,
irradiance
100
mW.cm-2,
1
mg.cm-2
BMCN65
loading.
This
confirmed
that
heterojunction
photocatalysts
enhance
micropollutants
in
PMRs.
ACS ES&T Engineering,
Journal Year:
2023,
Volume and Issue:
3(12), P. 2194 - 2201
Published: July 2, 2023
A
reactive
electrochemical
membrane
(REM)
has
been
identified
as
an
excellent
platform
in
micropolluted
water
purification
due
to
its
rapid
mass
transfer
capability.
Unlike
traditional
flow-by
systems,
the
convection-enhanced
REM
systems
activate
REM's
inner
reaction
sites,
potentially
imparting
a
spatially
variable
reactivity.
Therefore,
we
explored
spatial
scale
of
micropollutant
oxidation
REM.
Theoretical
and
experimental
evidence
demonstrated
that
might
feature
nonuniform
activity
along
depth
(about
hundreds
micrometers).
That
is,
zone
generating
•OH
was
located
within
few
micrometers
beneath
surface,
i.e.,
less
than
1%
overpotential/potential
drop
The
character
render
strong
direct
electron
ability,
enabling
removal
electron-rich
micropollutants
even
at
low
potentials.
However,
unsatisfactory
electron-poor
observed,
higher
potential
required
prompt
generation
•OH.
These
results
provide
in-depth
insight
into
REM,
contributing
analysis
mechanisms
optimization
design
operation
modules
for
cost-effective
purification.
Journal of Hazardous Materials,
Journal Year:
2024,
Volume and Issue:
476, P. 134765 - 134765
Published: June 6, 2024
Photocatalytic
membrane
reactors
(PMRs)
are
a
promising
technology
for
micropollutant
removal.
Sunlight
utilization
and
catalyst
surface
sites
limit
photodegradation.
A
poly(vinylidene
fluoride)
(PVDF)
nanofiber
composite
(NCM)
with
immobilized
visible-light-responsive
g-C3N4/Bi2MoO6
(BMCN)
were
developed.
Photodegradation
of
steroid
hormones
the
PVDF-BMCN
NCM
was
investigated
varying
properties,
operating
conditions,
relevant
solution
chemistry
under
solar
irradiation.
Increasing
CN
ratio
(0-65%)
enhanced
estradiol
(E2)
degradation
from
20±10
to
75±7%
due
improved
sunlight
photon
lifetime.
PVDF
nanofibers
reduced
self-aggregation
catalysts.
Hydraulic
residence
time
light
intensity
With
increasing
pH
value,
E2
removal
decreased
84±4
67±7%
owing
electrical
repulsion
thus
adsorption
between
catalysts
E2.
96%
can
be
attained
at
environmentally
feed
concentration
(100
ng.L–1)
flux
60
L.m-2.h-1,
irradiance
100
mW.cm-2,
1
mg.cm-2
BMCN65
loading.
This
confirmed
that
heterojunction
photocatalysts
enhance
micropollutants
in
PMRs.
