Abstract:Well-dispersed In2O3/ZnO nanoparticles covered Ag nanowires ternary component was synthesized by a facile co-precipitation process and exhibited excellent visible light photocatalytic performance.
“…The photocatalytic degradation of dyes mainly involves several active radical species such as hydroxyl radicals (·OH), holes (h + ), and electrons (e − ) [ 29 ]. In order to investigate the active species in the photocatalytic process to better understand the mechanism of photocatalysis, a series of scavengers were employed during the photo-degradation processes.…”
Section: Resultsmentioning
confidence: 99%
“…Figure 14 depicts the photocurrent response of the synthesized Co 3 O 4 , ZnO, and Co 3 O 4 /ZnO-35 heterostructures. Notably, the photocurrent density of Co 3 O 4 /ZnO-35 is much higher than that of ZnO and Co 3 O 4 , which indicated that the Co 3 O 4 /ZnO-35 has the highest photocatalytic activity [ 29 ]. Fig.…”
Section: Resultsmentioning
confidence: 99%
“…However, it can only absorb UV light for its wide bandgap [ 12 , 13 ]. On the contrary, ZnO is low cost and nontoxic, but possesses rapid recombination of photo-induced electron-hole pairs [ 29 ]. Fe 2 O 3 has short hole diffusion length (2–4 nm), poor conductivity, and charge recombination [ 30 ].…”
In this work, p-Co3O4/n-ZnO heterostructures were fabricated on Ni substrate by hydrothermal-decomposition method using cobaltous nitrate hexahydrate (Co(NO3)2·6H2O) and zinc acetate dihydrate (Zn(CH3COO)2·2H2O) as precursors with zinc acetate concentration varying from 5.0 to 55.0 mM. Structure and morphology of the developed samples were characterized by X-ray diffraction (XRD), Raman spectroscopy, and scanning electron microscopy (SEM). Effect of zinc acetate concentration on the photocatalytic activity of p-Co3O4/n-ZnO heterostructures was investigated by degradation of methyl orange (MO) under the UV light irradiation. The fabricated p-Co3O4/n-ZnO heterostructures exhibited higher photocatalytic activity than pure Co3O4 particles. In order to obtain the maximum photocatalytic activity, zinc acetate concentration was optimized. Specifically, at 35 mM of zinc acetate, the p-Co3O4/n-ZnO showed the highest photocatalytic activity with the degradation efficiency of MO reaching 89.38% after 72 h irradiation. The improvement of photocatalytic performance of p-Co3O4/n-ZnO heterostructures is due to the increased concentration of photo-generated holes on Co3O4 surface and the higher surface-to-volume ratio in the hierarchical structure formed by nano-lamellas.Graphical abstract
Electronic supplementary materialThe online version of this article (10.1186/s11671-018-2604-4) contains supplementary material, which is available to authorized users.
“…The photocatalytic degradation of dyes mainly involves several active radical species such as hydroxyl radicals (·OH), holes (h + ), and electrons (e − ) [ 29 ]. In order to investigate the active species in the photocatalytic process to better understand the mechanism of photocatalysis, a series of scavengers were employed during the photo-degradation processes.…”
Section: Resultsmentioning
confidence: 99%
“…Figure 14 depicts the photocurrent response of the synthesized Co 3 O 4 , ZnO, and Co 3 O 4 /ZnO-35 heterostructures. Notably, the photocurrent density of Co 3 O 4 /ZnO-35 is much higher than that of ZnO and Co 3 O 4 , which indicated that the Co 3 O 4 /ZnO-35 has the highest photocatalytic activity [ 29 ]. Fig.…”
Section: Resultsmentioning
confidence: 99%
“…However, it can only absorb UV light for its wide bandgap [ 12 , 13 ]. On the contrary, ZnO is low cost and nontoxic, but possesses rapid recombination of photo-induced electron-hole pairs [ 29 ]. Fe 2 O 3 has short hole diffusion length (2–4 nm), poor conductivity, and charge recombination [ 30 ].…”
In this work, p-Co3O4/n-ZnO heterostructures were fabricated on Ni substrate by hydrothermal-decomposition method using cobaltous nitrate hexahydrate (Co(NO3)2·6H2O) and zinc acetate dihydrate (Zn(CH3COO)2·2H2O) as precursors with zinc acetate concentration varying from 5.0 to 55.0 mM. Structure and morphology of the developed samples were characterized by X-ray diffraction (XRD), Raman spectroscopy, and scanning electron microscopy (SEM). Effect of zinc acetate concentration on the photocatalytic activity of p-Co3O4/n-ZnO heterostructures was investigated by degradation of methyl orange (MO) under the UV light irradiation. The fabricated p-Co3O4/n-ZnO heterostructures exhibited higher photocatalytic activity than pure Co3O4 particles. In order to obtain the maximum photocatalytic activity, zinc acetate concentration was optimized. Specifically, at 35 mM of zinc acetate, the p-Co3O4/n-ZnO showed the highest photocatalytic activity with the degradation efficiency of MO reaching 89.38% after 72 h irradiation. The improvement of photocatalytic performance of p-Co3O4/n-ZnO heterostructures is due to the increased concentration of photo-generated holes on Co3O4 surface and the higher surface-to-volume ratio in the hierarchical structure formed by nano-lamellas.Graphical abstract
Electronic supplementary materialThe online version of this article (10.1186/s11671-018-2604-4) contains supplementary material, which is available to authorized users.
“…To some extent, this limitation has been surmounted by combining these oxides with noble metals to extend the absorption into the visible region by the plasmonic effect, thereby improving their performance. 5−8 Alternatively, these materials have been combined with low band gap materials such as Cu 2 O, 9,10 WO 3 , , 11,12 In 2 O 3 , 13,14 CdS, 15 and so forth, rendering them favorable for the photocatalytic applications.…”
A highly porous architecture of graphitic
carbon nitride g-C3N4/Cu2O nanocomposite
in the form of
cubes with a side length of ≈ 1 μm, large pores of 1.5
nm, and a high surface area of 9.12 m2/g was realized by
an optimized in situ synthesis protocol. The synthesis protocol involves
dispersing a suitable “Cu” precursor into a highly exfoliated
g-C3N4 suspension and initiating the reaction
for the formation of Cu2O. Systematic optimization of the
conditions and compositions resulted in a highly crystalline g-C3N4/Cu2O composite. In the absence of
g-C3N4, the Cu2O particles assemble
into cubes with a size of around 300 nm and are devoid of pores. Detailed
structural and morphological evaluations by powder X-ray diffraction
and field emission scanning electron microscopy revealed the presence
of highly exfoliated g-C3N4, which is responsible
for the formation of the porous architecture in the cube like assembly
of the composite. The micrographs clearly reveal the porous structure
of the composite that retains the cubic shape of Cu2O,
and the energy-dispersive spectroscopy supports the presence of g-C3N4 within the cubic morphology. Among the different
g-C3N4/Cu2O compositions, CN/Cu-5
with 10% of g-C3N4, which is also the optimum
composition resulting in a porous cubic morphology, shows the best
visible light photocatalytic performance. This has been supported
by the ultraviolet diffuse reflectance spectroscopy (UV-DRS) studies
of the composite which shows a band gap of around 2.05 eV. The improved
photocatalytic performance of the composite could be attributed to
the highly porous morphology along with the suitable optical band
gap in the visible region of the solar spectrum. The optimized composite,
CN/Cu-5, demonstrates a visible light degradation of 81% for Methylene
Blue (MB) and 85.3% for Rhodamine-B (RhB) in 120 min. The decrease
in the catalyst performance even after three repeated cycles is less
than 5% for both MB and RhB dyes. The rate constant for MB and RhB
degradation is six and eight times higher with CN/Cu-5 when compared
with the pure Cu2O catalyst. To validate our claim that
the dye degradation is not merely decolorization, liquid chromatography–mass
spectroscopy studies were carried out, and the end products of the
degraded dyes were identified.
“…In this regard, heterostructured composites not only could expand the spectral range of light absorption but also promote charge separation and chemical stability, thus quenching the drawbacks of separate semiconductors. Moreover, noble metals, such as silver (Ag) nanostructures with surface plasmon resonance (SPR) effect, could broaden the absorption of semiconductor to the visible light region and promote the charge transfer/separation efficiency of photo-generated e/h pairs [16][17][18][19][20][21][22]. Therefore, in this work, we attempt to explore spontaneous formation of CuWO4/WO3 hetero-structured photocatalyst via PVP-assisted sol-gel approach and the visible enhanced photocatalytic performance of CuWO4/WO3 composite by incorporation of plasmonic silver nanostructures is comprehensively investigated.…”
A new plasmonic Ag hybridized CuWO4/WO3 heterostructured nanocomposite was successfully synthesized via a ligand-assisted sol gel method and the photocatalytic activity was evaluated by photo-degradation of methylene blue (MB) under visible light irradiation.
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