Flowing water enabled piezoelectric potential of flexible composite film for enhanced photocatalytic performance

Abstract IIn this paper, a codeposition method is used to prepare ZnO/Cu2O composite film with a heterojunction structure in one step. The microstructure and photoelectric properties of the prepared ZnO/Cu2O composite film are characterized and analyzed, and its photocatalytic performance is evaluated. Compared with pure the Cu2O film, the composite film exposes more (111) crystal planes, and has a smaller impedance and a larger photocurrent and open circuit voltage value. These findings indicate that the ZnO/Cu2O composite film exhibits excellent photogenerated carrier separation and migration efficiencies. Among the prepared samples, M2 demonstrates the highest photocatalytic and recycling performance. The calculation of the band position shows that the Fermi level of the composite film exhibits a significant shift compared to that of the pure Cu2O film. The analysis shows that the decrease in the recombination probability of photogenerated carriers caused by the shift of the Fermi level and formation of an internal electric field is the main factor for the significant enhancement in the Cu2O photocatalytic performance. This article provides a novel method and idea to realize the efficient removal of organic dye pollutants in sewage.

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Graphene Quantum Dots Doped PVDF(TBT)/PVP(TBT) Fiber Film with Enhanced Photocatalytic Performance

Applied Sciences ◽

10.3390/app10020596 ◽

2020 ◽

Vol 10 (2) ◽

pp. 596 ◽

Cited By ~ 3

Author(s):

Fubao Zhang ◽

Chen Yang ◽

Xiao-Xiong Wang ◽

Ru Li ◽

Zhong Wan ◽

...

Keyword(s):

Quantum Dots ◽

Composite Film ◽

Hydrothermal Method ◽

Polyvinylidene Fluoride ◽

Photocatalytic Performance ◽

Graphene Quantum Dots ◽

Polyvinyl Pyrrolidone ◽

Tetrabutyl Titanate ◽

Photocatalytic Efficiency ◽

Response Range

We report the fabrication of polyvinylidene fluoride (tetrabutyl titanate)/polyvinyl pyrrolidone ((tetrabutyl titanate))-graphene quantum dots [PVDF(TBT)/PVP(TBT)-GQDs] film photocatalyst with enhanced photocatalytic performance. The polyvinylidene fluoride (tetrabutyl titanate)/polyvinyl pyrrolidone ((tetrabutyl titanate)) [PVDF(TBT)/PVP(TBT)] film was first prepared with a dual-electrospinning method and then followed by attaching graphene quantum dots (GQDs) to the surface of the composite film through a hydrothermal method. Later, part of the PVP in the composite film was dissolved by a hydrothermal method. As a result, a PVDF(TBT)/PVP(TBT)-GQDs film photocatalyst with a larger specific surface area was achieved. The photocatalytic degradation behavior of the PVDF(TBT)/PVP(TBT)-GQDs film photocatalyst was examined by using Rhodamine B as the target contaminant. The PVDF(TBT)/PVP(TBT)-GQDs photocatalyst showed a higher photocatalytic efficiency than PVDF(TBT)-H2O, PVDF(TBT)/PVP(TBT)-H2O, and PVDF(TBT)-GQDs, respectively. The enhanced photocatalytic efficiency can be attributed to the broader optical response range of the PVDF(TBT)/PVP(TBT)-GQDs photocatalyst, which makes it useful as an effective photocatalyst under white light irradiation.

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Study on photocatalytic performance of cerium-graphene oxide-titanium dioxide composite film for formaldehyde removal

physica status solidi (a) ◽

10.1002/pssa.201600261 ◽

2016 ◽

Vol 213 (12) ◽

pp. 3157-3164 ◽

Cited By ~ 13

Author(s):

Jia Li ◽

Quan Zhang ◽

Alvin C. K. Lai ◽

Liping Zeng

Keyword(s):

Titanium Dioxide ◽

Graphene Oxide ◽

Composite Film ◽

Photocatalytic Performance ◽

Formaldehyde Removal

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Poly(vinyl alcohol)-based composite film with Ag-immobilized TEMPO-oxidized nano-tea cellulose for improving photocatalytic performance

Journal of Materials Science ◽

10.1007/s10853-021-06098-4 ◽

2021 ◽

Author(s):

Hanyu Wen ◽

Yu-I Hsu ◽

Taka-Aki Asoh ◽

Hiroshi Uyama

Keyword(s):

Composite Film ◽

Vinyl Alcohol ◽

Photocatalytic Performance ◽

Poly Vinyl Alcohol

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Direct Observation of Heat Exchanger Deposits by Cross Sectioning

Proceedings, annual meeting, Electron Microscopy Society of America ◽

10.1017/s0424820100061835 ◽

1967 ◽

Vol 25 ◽

pp. 364-365

Author(s):

R. W. Anderson ◽

D. L. Senecal

Keyword(s):

Electron Microscopy ◽

Transmission Electron Microscopy ◽

Heat Exchanger ◽

Direct Observation ◽

Cross Sections ◽

Preparation Method ◽

Specimen Preparation ◽

Flowing Water ◽

Transmission Electron ◽

Deposit Layer

A problem was presented to observe the packing densities of deposits of sub-micron corrosion product particles. The deposits were 5-100 mils thick and had formed on the inside surfaces of 3/8 inch diameter Zircaloy-2 heat exchanger tubes. The particles were iron oxides deposited from flowing water and consequently were only weakly bonded. Particular care was required during handling to preserve the original formations of the deposits. The specimen preparation method described below allowed direct observation of cross sections of the deposit layers by transmission electron microscopy.The specimens were short sections of the tubes (about 3 inches long) that were carefully cut from the systems. The insides of the tube sections were first coated with a thin layer of a fluid epoxy resin by dipping. This coating served to impregnate the deposit layer as well as to protect the layer if subsequent handling were required.

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