Efficient Photocatalytic Bilirubin Removal over the Biocompatible Core/Shell P25/g-C3N4 Heterojunctions with Metal-free Exposed Surfaces under Moderate Green Light Irradiation

Abstract

Highly-monodispersed g-C3N4/TiO2 hybrids with a core/shell structure were synthesized from a simple room temperature impregnation method, in which g-C3N4 was coated through self-assembly on the commercially available Degussa P25 TiO2 nanoparticles. Structural and surface characterizations showed that the presence of g-C3N4 notably affected the light absorption characteristics of TiO2. The g-C3N4/TiO2 heterojunctions with metal-free exposed surfaces were directly used as biocompatible photocatalysts for simulated jaundice phototherapy under low-power green-light irradiation. The photocatalytic activity and stability of g-C3N4/TiO2 were enhanced relative to pure P25 or g-C3N4, which could be ascribed to the effective Z-scheme separation of photo-induced charge carriers in g-C3N4/TiO2 heterojunction. The photoactivity was maximized in the 4 wt.% g-C3N4-coated P25, as the bilirubin removal rate under green light irradiation was more than 5-fold higher than that under the clinically-used blue light without any photocatalyst. This study approves the future applications of the photocatalyst-assisted bilirubin removal in jaundice treatment under moderate green light which is more tolerable by humans.

Cellulose-Derived Hierarchical g-C3N4/TiO2-Nanotube Heterostructured Composites with Enhanced Visible-Light Photocatalytic Performance

“…These results demonstrate the significant role of the • O 2 – species during the photocatalytic process in degrading MB by this g-C 3 N 4 /TiO 2 -NT nanocomposite, while the h + and • OH species have no impacts on this. It reveals that the visible-light-induced photocatalytic mechanism is similar to the type-II heterostructured model of this g-C 3 N 4 /TiO 2 -NT nanocomposite. , On this occasion, the electrons photogenerated from the conduction band (CB) of the g-C 3 N 4 phase are shifted onto the CB of the TiO 2 phase under the excitation of visible light, which causes higher separation and transfer efficiencies of the photogenerated carriers.…”

“…It reveals that the visible-light-induced photocatalytic mechanism is similar to the type-II heterostructured model of this g-C 3 N 4 /TiO 2 -NT nanocomposite. 51,52 On this occasion, the electrons photogenerated from the conduction band (CB) of the g-C 3 N 4 phase are shifted onto the CB of the TiO 2 phase under the excitation of visible light, which causes higher separation and transfer efficiencies of the photogenerated carriers.…”

Photocatalytic disinfection and purification of water employing reduced graphene oxide/TiO2 composites

“…84–1268), respectively, whereas the characteristic diffraction peaks at 27.5°, 36.1° and 41.2 ° are attributed to the (110), (101) and (111) facets of rutile, respectively (JCPDS card no. 88–1175) . The peak of GO at 10.3° has almost disappeared in the 5% rGO/TiO 2 P25 composite, suggesting a high degree of reduction into rGO.…”

“…More specifically, the peaks at 2 = 25. 53 The peak of GO at 10.3 ∘ has almost disappeared in the 5% rGO/TiO 2 P25 composite, suggesting a high degree of reduction into rGO. The peak of rGO at ≈25.5 ∘ is being masked by the high diffraction intensity peak of anatase at 25.2 ∘ .…”

Atualizações sobre fototerapia em neonatos a termo e pré-termo com icterícia não-hemolítica

“…Os riscos de danos decorrentes da exposição à esse tipo de luminescência, no caso do LED, tanto para as equipes de saúde quanto para outros indivíduos que estão no mesmo ambiente da incubadora parece ser baixo (12). Entretanto, a eficácia do azul tem sido posta à prova, visto que algumas pesquisas demonstraram maior eficácia do verde 510 nm quando um fotocatalisador não-tóxico é adicionado ao sangue do infante (27,28). Ademais, outro estudo demonstrou que o espectro da luz turquesa 497 nm tem eficácia parecida, mas gera diferentes equilíbrios fotoisoméricos, os quais possuem significância clínica ainda misteriosa (11).…”