In situ synthesis of TiO2 nanosheets@CdSe nanocomposites and the improved photocatalytic performance on removal of methylene blue

Xu, Dong‐Hui; Liu, Bin; Zou, Wei; Wang, Hong; Zhang, Chen

doi:10.1016/j.apsusc.2019.05.042

Cited by 27 publications

(7 citation statements)

References 56 publications

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“…Since the inherent band gap of TiO 2 is 3.2 eV, it can only absorb ultraviolet light, and the photo-generated electrons and holes generated easily recombine [18], limiting the use of TiO 2 . At present, the main methods to modify the photoelectrochemical performance of TiO 2 include metal ion or non-metal ion doping [19,20], coupling with narrow band gap semiconducting materials [21,22], precious metal deposition [23,24], nanostructure construction [25], and polymer modification [26]. Graphene oxide (GO) is the oxide of graphene (GR), where the layered structure of GR remains after oxidation.…”

Section: Introductionmentioning

confidence: 99%

Design an Epoxy Coating with TiO2/GO/PANI Nanocomposites for Enhancing Corrosion Resistance of Q235 Carbon Steel

Chen

et al. 2021

Materials

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In this work, a ternary TiO2/Graphene oxide/Polyaniline (TiO2/GO/PANI) nanocomposite was synthesized by in situ oxidation and use as a filler on epoxy resin (TiO2/GO/PANI/EP), a bifunctional in situ protective coating has been developed and reinforced the Q235 carbon steel protection against corrosion. The structure and optical properties of the obtained composites are characterized by XRD, FTIR, and UV–vis. Compared to bare TiO2 and bare Q235, the TiO2/GO/PANI/EP coating exhibited prominent photoelectrochemical properties, such as the photocurrent density increased 0.06 A/cm2 and the corrosion potential shifted from −651 mV to −851 mV, respectively. The results show that the TiO2/GO/PANI nanocomposite has an extended light absorption range and the effective separation of electron-hole pairs improves the photoelectrochemical performance, and also provides cathodic protection to Q235 steel under dark conditions. The TiO2/GO/PANI/EP coating can isolate the Q235 steel from the external corrosive environment, and may generally be regarded a useful protective barrier coating to metallic materials. When the TiO2/GO/PANI composite is dispersed in the EP, the compactness of the coating is improved and the protective barrier effect is enhanced.

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Section: Introductionmentioning

confidence: 99%

Design an Epoxy Coating with TiO2/GO/PANI Nanocomposites for Enhancing Corrosion Resistance of Q235 Carbon Steel

Chen

et al. 2021

Materials

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“…The results indicated that the bioassembled QDs were primarily composed of Cd, S, and Se with a ratio of approximately 1:0.75:0.25, which confirmed that the molecular formula of the QDs was CdS 0.75 Se 0.25 . In addition, the SAED pattern (Figure c) of CdS 0.75 Se 0.25 QDs indicated that the nanocrystals had a polycrystalline structure …”

Section: Resultsmentioning

confidence: 79%

“…In addition, the SAED pattern (Figure 3c) of CdS 0.75 Se 0.25 QDs indicated that the nanocrystals had a polycrystalline structure. 40 On the basis of a previous report, we assumed that the QDs were coated with proteins. 9 The SDS-PAGE image (Figure S2c) of the purified QDs exhibited a single intense protein band, probably owing to wrapped proteins on the CdS 0.75 Se 0.25 QDs.…”

Section: ■ Results and Discussionmentioning

confidence: 99%

Fungal In Situ Assembly Gives Novel Properties to CdS_xSe_1–x Quantum Dots for Sensitive Label-Free Detection of Chloramphenicol

Yang

Han

et al. 2020

ACS Sustainable Chem. Eng.

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Quantum dots (QDs) are attracting significant attention for the development of sensitive detection methods because of their unique optical properties. Biosynthetic QDs using organisms is a promising alternative route to chemical synthesis because it is a simple and eco-friendly process. Herein, we developed a straightforward and green system for the biological assembly of CdS x Se1–x QDs by Phomopsis sp. XP-8 within 6 h, a more efficient approach than those reported in other organisms. The QDs were shown to have a CdS0.75Se0.25@oligopeptide transporter structure, and the production process was shown to be strongly influenced by intracellular glutathione content. The QDs were monodispersed with a uniform spherical shape of 3.22 ± 0.07 nm in diameter. They exhibited good water solubility and excellent fluorescence properties. The QDs could be extracted and used directly as a sensitive chloramphenicol (CAP) probe via static fluorescence quenching in the linear range from 3.13 to 500 μg/L with a detection limit of 0.89 μg/L. The detection method was highly selective for CAP with minimal interference from other antibiotics and was used to successfully detect CAP in milk samples. Overall, this work has great significance for the development of a fast and simple QD synthesis system via biological assembly.

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“…The difference of 0.88 eV corresponds well to the Se 3d 5/2 and Se 3d 3/2 components of Se 2– species, respectively. , It is worth noting though that the binding energy of the Cd 3d peaks in CdS shifts to lower binding energies than that in CdSe, a fact that is in agreement with a previous report . Moreover, the lower binding energy in the case of rTNTAs60CdS compared to rTNTAs60CdSe suggests a more intimate interfacial contact between CdS and TiO 2 …”

Section: Results and Discussionmentioning

confidence: 98%

Water Vapor Photoelectrolysis in a Solid-State Photoelectrochemical Cell with TiO₂ Nanotubes Loaded with CdS and CdSe Nanoparticles

Kang

Chaperman

Galeckas

et al. 2021

ACS Appl. Mater. Interfaces

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In this study, polyol-made CdS and CdSe crystalline nanoparticles (NPs) are loaded by impregnation on TiO 2 nanotube arrays (TNTAs) for solar-simulated light-driven photoelectrochemical (PEC) water vapor splitting. For the first time, we introduce a safe way to utilize toxic, yet efficient photocatalysts by integration in solid-state PEC (SSPEC) cells. The enabling features of SSPEC cells are the surface protonic conduction mechanism on TiO 2 and the use of polymeric electrolytes, such as Nafion instead of liquid ones, for operation with gaseous reactants, like water vapor from ambient humidity. Herein, we studied the effects of both the operating conditions in gaseous ambient atmospheres and the surface modifications of TNTAs-based photoanodes with well-crystallized CdS and CdSe NPs. We showed 3.6 and 2.5 times increase in the photocurrent density of defective TNTAs modified with CdS and CdSe, respectively, compared to the pristine TNTAs. Electrochemical impedance spectroscopy and structural characterizations attributed the improved performance to the higher conductivity induced by intrinsic defects as well as to the enhanced electron/hole separation at the TiO 2 /CdS heterojunction under gaseous operating conditions. The SSPEC cells were evaluated by cycling between high relative humidity (RH) (80%) and low RH levels (40%), providing direct evidence of the effect of RH and, in turn, adsorbed water, on the cell performance. Online mass spectrometry indicated the corresponding difference in the H 2 production rate. In addition, a complete restoration of the SSPEC cell performance from low to high RH levels was also achieved. The presented system can be employed in off-grid, water depleted, and air-polluted areas for the production of hydrogen from renewable energy and provides a solution for the safe use of toxic, yet efficient photocatalysts.

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In situ synthesis of TiO2 nanosheets@CdSe nanocomposites and the improved photocatalytic performance on removal of methylene blue

Cited by 27 publications

References 56 publications

Design an Epoxy Coating with TiO2/GO/PANI Nanocomposites for Enhancing Corrosion Resistance of Q235 Carbon Steel

Design an Epoxy Coating with TiO2/GO/PANI Nanocomposites for Enhancing Corrosion Resistance of Q235 Carbon Steel

Fungal In Situ Assembly Gives Novel Properties to CdS_xSe_1–x Quantum Dots for Sensitive Label-Free Detection of Chloramphenicol

Water Vapor Photoelectrolysis in a Solid-State Photoelectrochemical Cell with TiO₂ Nanotubes Loaded with CdS and CdSe Nanoparticles

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In situ synthesis of TiO2 nanosheets@CdSe nanocomposites and the improved photocatalytic performance on removal of methylene blue

Cited by 27 publications

References 56 publications

Design an Epoxy Coating with TiO2/GO/PANI Nanocomposites for Enhancing Corrosion Resistance of Q235 Carbon Steel

Design an Epoxy Coating with TiO2/GO/PANI Nanocomposites for Enhancing Corrosion Resistance of Q235 Carbon Steel

Fungal In Situ Assembly Gives Novel Properties to CdSxSe1–x Quantum Dots for Sensitive Label-Free Detection of Chloramphenicol

Water Vapor Photoelectrolysis in a Solid-State Photoelectrochemical Cell with TiO2 Nanotubes Loaded with CdS and CdSe Nanoparticles

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Product

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Fungal In Situ Assembly Gives Novel Properties to CdS_xSe_1–x Quantum Dots for Sensitive Label-Free Detection of Chloramphenicol

Water Vapor Photoelectrolysis in a Solid-State Photoelectrochemical Cell with TiO₂ Nanotubes Loaded with CdS and CdSe Nanoparticles