Artículo
Simultaneous detection and photocatalysis performed on a 3D graphene/ZnO hybrid platform
Messina, María Mercedes
; Coustet, Marcos Eduardo
; Ubogui, Joaquin Hernán; Ruiz, Remigio
; Saccone, Fabio Daniel
; Dos Santos Claro, Paula Cecilia
; Ibañez, Francisco Javier
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Fecha de publicación:
12/02/2020
Editorial:
American Chemical Society
Revista:
Langmuir
ISSN:
0743-7463
e-ISSN:
1520-5827
Idioma:
Inglés
Tipo de recurso:
Artículo publicado
Clasificación temática:
Resumen
The synergy between graphene foam (Gf) and ZnO nanoparticles (NPs) allows the detection of analytes at low conentrations, which can be subsequently photocatalyzed on the hybrid surface as well as in the liquid phase upon illumination with low-power UV-vis light-emitting diode (LED) lamps. Detection of methylene blue (MB) and bisphenol A (BPA) is monitored either by graphene-enhanced Raman scattering (GERS) or molecular doping/sensing upon analyte adsorption. Using GERS, we were able to detect concentrations as low as 0.3 ppm of MB, which remained adsorbed on the graphene surface after a photocatalytic conversion of 88% (total conversion). The photocatalysis performances of BPA and MB performed in the liquid phase were lower and corresponded to 73 and 33% as indicated by gas chromatography-mass spectrometry (GC/MS) and UV-vis, respectively. The kinetics of photocatalysis was fitted with a quasi-first-order reaction, and the apparent rate constant (kapp) was calculated according to the Langmuir-Hinshelwood model. The fastest kinetics was achieved with the hybrid platform named "Gf-ZnO400", which was thermally treated at high temperatures and with most of the Ni etched away. This is consistent with the excellent electronic interaction between ZnO and graphene foam as indicated by photoelectrochemistry analysis. We mainly employed Raman scattering and UV-vis spectroscopy analyses for detection and photocatalysis applications; however, we also used other complementary techniques such as focused ion-beam scanning electron microscopy (FIB-SEM), X-ray photoelectron spectroscopy (XPS), diffuse reflectance, GC/MS, and photoelectrochemistry to explore the synergetic behavior of these two nanomaterials. This work brings about new insights into the detection of analyte molecules followed by photocatalysis performed in the solid and liquid states.
Palabras clave:
GRAPHENE
,
PHOTOCATALYSIS
,
DETECTION
,
NANOPARTICLES
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Articulos(INIFTA)
Articulos de INST.DE INV.FISICOQUIMICAS TEORICAS Y APLIC.
Articulos de INST.DE INV.FISICOQUIMICAS TEORICAS Y APLIC.
Citación
Messina, María Mercedes; Coustet, Marcos Eduardo; Ubogui, Joaquin Hernán; Ruiz, Remigio; Saccone, Fabio Daniel; et al.; Simultaneous detection and photocatalysis performed on a 3D graphene/ZnO hybrid platform; American Chemical Society; Langmuir; 36; 9; 12-2-2020; 2231-2239
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