TY - JOUR
T1 - Photocatalytic properties of g-c3 n4 –supported on the sral2 o4:Eu,dy/sio2
AU - Mavengere, Shielah
AU - Kim, Jung Sik
N1 - Publisher Copyright:
© 2020 by the authors. Licensee MDPI, Basel, Switzerland.
PY - 2020/10
Y1 - 2020/10
N2 - Graphitic carbon nitride (g-C3 N4) was supported on SrAl2 O4:Eu,Dy-SiO2 by a colloidal-sol coating method to improve its light absorption property. Transmission electron microscopy (TEM) revealed that the nanoparticles of g-C3 N4 were coated on sub-micron phosphor particles and nanoscale surface roughness was imparted by the SiO2-binder. Photoluminescence (PL) spectrum of the g-C3 N4 supported on SrAl2 O4:Eu,Dy exhibited a broadband emission from 400 to 650 nm. Increasing silica-binder in the g-C3 N4 /SrAl2 O4:Eu,Dy composites suppressed the PL emission peak at 525 nm for SrAl2 O4:Eu,Dy. Photocatalytic degradation activity was evaluated with 5 ppm methylene blue (MB) solutions under germicidal ultraviolet (UV) and visible (Vis) solar light illuminations. The UV/Vis photocatalytic efficiency was improved by supporting g-C3 N4 on the SrAl2 O4:Eu,Dy phosphor and with the addition of SiO2 as a binder. In addition, low silica addition effectively improved the adhesiveness of the g-C3 N4 coating on the SrAl2 O4:Eu,Dy surface. Recyclability tests of photocatalysis for the SrAl2 O4:Eu,Dy-0.01M SiO2 /50wt% g-C3 N4 composites exhibited a remarkable stability by maintaining the degradation efficiencies above 90% in four cycles. Therefore, the composite of g-C3 N4-supported SrAl2 O4:Eu,Dy-SiO2 is a prospective photocatalyst activating under UV/Vis light irradiation for the elimination of environmental pollutants.
AB - Graphitic carbon nitride (g-C3 N4) was supported on SrAl2 O4:Eu,Dy-SiO2 by a colloidal-sol coating method to improve its light absorption property. Transmission electron microscopy (TEM) revealed that the nanoparticles of g-C3 N4 were coated on sub-micron phosphor particles and nanoscale surface roughness was imparted by the SiO2-binder. Photoluminescence (PL) spectrum of the g-C3 N4 supported on SrAl2 O4:Eu,Dy exhibited a broadband emission from 400 to 650 nm. Increasing silica-binder in the g-C3 N4 /SrAl2 O4:Eu,Dy composites suppressed the PL emission peak at 525 nm for SrAl2 O4:Eu,Dy. Photocatalytic degradation activity was evaluated with 5 ppm methylene blue (MB) solutions under germicidal ultraviolet (UV) and visible (Vis) solar light illuminations. The UV/Vis photocatalytic efficiency was improved by supporting g-C3 N4 on the SrAl2 O4:Eu,Dy phosphor and with the addition of SiO2 as a binder. In addition, low silica addition effectively improved the adhesiveness of the g-C3 N4 coating on the SrAl2 O4:Eu,Dy surface. Recyclability tests of photocatalysis for the SrAl2 O4:Eu,Dy-0.01M SiO2 /50wt% g-C3 N4 composites exhibited a remarkable stability by maintaining the degradation efficiencies above 90% in four cycles. Therefore, the composite of g-C3 N4-supported SrAl2 O4:Eu,Dy-SiO2 is a prospective photocatalyst activating under UV/Vis light irradiation for the elimination of environmental pollutants.
KW - Colloidal-sol coating
KW - G-C N
KW - SiO
KW - SrAl O:Eu,Dy phosphor
KW - UV-visible light photocatalysis
UR - http://www.scopus.com/inward/record.url?scp=85093860496&partnerID=8YFLogxK
U2 - 10.3390/coatings10100917
DO - 10.3390/coatings10100917
M3 - Article
AN - SCOPUS:85093860496
SN - 2079-6412
VL - 10
SP - 1
EP - 17
JO - Coatings
JF - Coatings
IS - 10
M1 - 917
ER -