Fabrication of redox-mediator-free Z-scheme CdS/NiCo2O4 photocatalysts with enhanced visible-light driven photocatalytic activity in Cr(VI) reduction and antibiotics degradation

Hu, Dong‐Cheng; Xu, Youyuan; Zhang, Shengya; Tu, Jibing; Zhi, Lihua; Liu, Jiacheng

doi:10.1016/j.colsurfa.2020.125582

Cited by 39 publications

(6 citation statements)

References 89 publications

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“…PL spectra resulted from the recombination of photoexcited charge carriers are also used to re ect charge separation ability. Figure 11b showed PL spectra of two samples, which displayed obvious emission peaks located at 560-565 nm, similar to the peak at 565 nm in literature [25]. Compared to nanoparticles, nanorings displayed lower PL intensity, indicating that the electrons and holes were uneasy to recombine [29].…”

Section: Charge Separationsupporting

confidence: 70%

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Hydrazine-induced synthesis of CdS nanorings for the application in photodegradation

Zheng

Wang

et al. 2023

Res Chem Intermed

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In this paper, CdS nanorings synthesized by facile hydrazine-induced microwave method for the photodegradation of pollutants has been reported for the rst time. Different reaction method, microwave power, the category and dosage of pH regulating reagent, reaction temperature and reaction time were investigated. The formation of CdS nanorings from the self-assembly of nanoparticles was attributed to the coordination of hydrazine producing the dipole-dipole interaction among the uniform nanoparticles obtained by microwave method. The crystal phase, composition, morphology and surface property of CdS nanorings were characterized. The results showed that 100 nm-sized wurtzite CdS nanorings with positive surface charges formed by the self-assembly of 5-8 nm nanoparticles, which presented mesoporous structures with maximum pore size of 52 nm. To study the in uence of ring-like structures on the photocatalysis, the photodegradation of rhodamine B (RhB) by CdS nanorings and nanoparticles were compared. The results showed that, CdS nanorings displayed higher photodegradation e ciency, which were originated from favorable band edge potential and obviously more effective electron-hole separation producing more superoxide radical and holes as active speci es. The photodegradation path of RhB contains the process as the demethylation, the decarboxylation process, the chromophore cleavage and ring-open reactions. Finally, the available photodegradation of multiple pollutants and reusability of CdS nanorings were carried out.

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Section: Charge Separationsupporting

confidence: 70%

“…Quantitative calculation showed that BET surface area was 35.61 m 2 /g. The large speci c surface areas can provide more active sites for su cient contact between photocatalysts and pollutants [25].…”

Section: Surface Propertymentioning

confidence: 99%

Hydrazine-induced synthesis of CdS nanorings for the application in photodegradation

Zheng

Wang

et al. 2023

Res Chem Intermed

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“…According to the literature, both photocatalysis and photolysis have similar degradation paths, but the distinction between both processes is the concentration of the hydroxyl radical. , Previously, to make out the radical arrangement, the electron spin resonance spectra of the NCO photocatalyst were calculated in aqueous medium by trapping photogenerated holes and • OH and • O 2 – radicals. The study highlights that both the holes and electrons are playing an important role in the presence of oxygen. ,, …”

Section: Resultsmentioning

confidence: 89%

Annealing Temperature- and Morphology-Controlled Development of Nickel Cobaltite Nanoneedles for Photocatalytic Degradation of Nitroaromatics

Yadav

Raut

Patro

et al. 2022

Ind. Eng. Chem. Res.

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A one-dimensional (1D) nanoneedles of nickel cobaltite have been developed and applied to treat nitroaromatics-bearing wastewater. A significant change in the magnetic and photocatalytic properties of NCO has been observed at different annealing temperatures and is correlated to the morphology and phase structure. The sample annealed at 550 °C displayed the sharpest 1D nanoneedle-like structure with an optimum surface area (44 m 2 g −1 ), pore size (11 nm), band gap energies (1.87 and 2.52 eV), and saturation magnetizations (5.09 emu g −1 ) at a 5 T magnetic field. The complete photodegradation of 2,4,6-trinitrotoluene (50 mg L −1 ) occurred within 3 h by using NCO-550 (300 mg L −1 ) under UV−vis light. The degradation rate showed first-order kinetics with a rate constant of 1.6 h −1 . The magnetic behavior of the catalyst showed negligible wastage even after repeated cycles. The degradation mechanism, as elucidated by gas chromatography−mass spectroscopy (GCMS), indicated complete mineralization of the nitroaromatics into CO 2 and H 2 O.

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“…In addition, some reduced products with strong oxidation, such as hydroxyl radicals ( • OH) or superoxide radicals ( • O 2 – ), may pose a threat to biological molecules (enzyme, aptamer, immune molecules, etc. ). , This irreversible damage would degrade the performance of the biosensor. More importantly, the addition of the electron donor and electron acceptor would also make the redox reaction prior to the photoelectrical behavior, thus affecting the accuracy of detection results. , …”

Section: Introductionmentioning

confidence: 99%

Novel Anti-Interference Strategy for a Self-Powered Sensor: Mediator-Free and Biospecific Photocathode Interface

Wei

Gao

et al. 2021

Anal. Chem.

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As a new electrochemical sensing concept, a self-powered sensor shows a good application prospect in the field of analysis. However, it is still a great challenge to improve the anti-interference capability of sensors through reasonable design. In this study, we investigated the difference between the single photoanode and photocathode self-powered sensor and combined the advantages of these two aspects to fabricate a mediator-free self-powered aptasensor based on the dual-photoelectrode system, which combined the biological events from the photocathode. The biological events occurred at the photocathode could avoid the interference caused by the generated hole oxidation of reducing small molecules in the real sample on the photoanode surface, which was helpful to enhance the anti-interference capability of the sensor. Moreover, due to the sufficient Fermi level differentiation between two photoelectrodes, the redox mediator was not necessary. This could avoid the redox reaction caused by the introduction of extra electron donors or electron acceptors occurring before the photoelectrical behavior, thus improving the accuracy of the sensor. According to the influence of the generated biological conjugate on the external circuit, electron transmission between interfaces, and the obstruction of visible light irradiation, the sensitive and accurate detection of the analytical model was achieved. This work provided a proof-of-concept for the establishment of a mediator-free dual-photoelectrode self-powered sensing platform with high sensitivity and strong anti-interference performance.

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Fabrication of redox-mediator-free Z-scheme CdS/NiCo2O4 photocatalysts with enhanced visible-light driven photocatalytic activity in Cr(VI) reduction and antibiotics degradation

Cited by 39 publications

References 89 publications

Hydrazine-induced synthesis of CdS nanorings for the application in photodegradation

Hydrazine-induced synthesis of CdS nanorings for the application in photodegradation

Annealing Temperature- and Morphology-Controlled Development of Nickel Cobaltite Nanoneedles for Photocatalytic Degradation of Nitroaromatics

Novel Anti-Interference Strategy for a Self-Powered Sensor: Mediator-Free and Biospecific Photocathode Interface

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