A research on the visible light photocatalytic activity and kinetics of CdS/CdSe co-modified TiO 2 nanotube arrays

Lv, Jun; Wang, Honge; Gao, Huazhen; Xu, Guangqing; Wang, Dongmei; Chen, Zhong; Zhang, Xinyi; Zhang, Zheng; Wu, Yucheng

doi:10.1016/j.surfcoat.2014.10.066

Cited by 20 publications

(8 citation statements)

References 42 publications

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“…A similar hypsochromic shift of the absorption band at 553 nm to that observed under simulated sunlight irradiation was observed, indicating that photooxidative N -de-ethylation of RhB occurred in the early stages of its photodegradation. Finally, although the operating conditions and the structure of the pollutant were different from those used in this study, the CdSe NR/TiO 2 nanoparticle photocatalyst favorably compares with catalysts engineered from CdSe quantum dots and TiO 2 nanoparticles or nanotubes [9,11–12 22,26,31,33–34]. …”

Section: Resultsmentioning

confidence: 96%

CdSe nanorod/TiO₂ nanoparticle heterojunctions with enhanced solar- and visible-light photocatalytic activity

Laatar¹,

Moussa²,

Alem³

et al. 2017

Beilstein J. Nanotechnol.

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CdSe nanorods (NRs) with an average length of ≈120 nm were prepared by a solvothermal process and associated to TiO2 nanoparticles (Aeroxide® P25) by annealing at 300 °C for 1 h. The content of CdSe NRs in CdSe/TiO2 composites was varied from 0.5 to 5 wt %. The CdSe/TiO2 heterostructured materials were characterized by XRD, TEM, SEM, XPS, UV–visible spectroscopy and Raman spectroscopy. TEM images and XRD patterns show that CdSe NRs with wurtzite structure are associated to TiO2 particles. The UV–visible spectra demonstrate that the narrow bandgap of CdSe NRs serves to increase the photoresponse of CdSe/TiO2 composites until ≈725 nm. The CdSe (2 wt %)/TiO2 composite exhibits the highest photocatalytic activity for the degradation of rhodamine B in aqueous solution under simulated sunlight or visible light irradiation. The enhancement in photocatalytic activity likely originates from CdSe sensitization of TiO2 and the heterojunction between these materials which facilitates electron transfer from CdSe to TiO2. Due to its high stability (up to ten reuses without any significant loss in activity), the CdSe/TiO2 heterostructured catalysts show high potential for real water decontamination.

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Section: Resultsmentioning

confidence: 96%

CdSe nanorod/TiO₂ nanoparticle heterojunctions with enhanced solar- and visible-light photocatalytic activity

Laatar¹,

Moussa²,

Alem³

et al. 2017

Beilstein J. Nanotechnol.

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“…CdS and CdSe nanoparticle deposited on ordered TiO 2 nanotubes [20] were found to efficiently degrade methylene orange dye (up to 95%) within 120 min of visible light irradiation. Ninety percent MB dye degradation was achieved in the presence of visible light by TiO 2 /CuS composite nanostructure, synthesized via surface functionalization route [21].…”

Section: Photocatalytic Degradation Of Mb Dyementioning

confidence: 99%

A Facile Platform for Photocatalytic Reduction of Methylene Blue Dye By CdSe-TiO2 Nanoparticles

Mir

Singh

Rawat

2017

Water Conserv Sci Eng

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Herein, we report on the demonstration of enhanced photocatalytic reduction of methylene blue (MB) dye using a physical mixture (w/w ratio: 50:1-9) of TiO 2 nanoparticles (size ≈ 20 ± 1 nm) and CdSe nanocrystals (size ≈ 3.0 ± 0.2 nm). It was found that at the highest content of the nanocrystals (9 mg) in the physical mixture, 67% reduction in the dye concentration could be achieved in a period of 60 min to prepare a physical mixture. Nanocatalyst characterization was accomplished using XRD, SEM, FTIR, UV-visible and Raman spectroscopy. The results showed that the prepared nanocatalyst could remove MB dye from waste water under the presence, as well as in the absence of UV-irradiation, while pristine TiO 2 nanoparticles or the CdSe nanocrystals did not possess sufficient photocatalytic activity in the absence of UV-radiation. It is concluded that presence of CdSe nanocrystals at a mass concentration of less than 5% can be used for the remediation of water polluted with industrial dyes.

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“…And the peak values at 1111.0 and 1105.6 eV correspond to Cd MNN (Figure 2e), 50 indicating that the valence of Cd in the CdSe/TiO 2 NTs sample is +2. 51,52 According to the energy spectra of Se 3d (Figure 2f), binding energies of 53.2 and 54.1 eV correspond to Se 3d 5/2 and Se 3d 3/2 , respectively, indicating the presence of Se 2− . 53 Compared with pure TiO 2 and CdSe, the O 1s peak position of the CdSe/TiO 2 heterostructure shifts to the high binding energy region and Se 3d shifts to the lower binding energy region, indicating that electrons are transferred from TiO 2 to CdSe.…”

Section: ■ Results and Discussionmentioning

confidence: 99%

CdSe/TiO₂NTs Heterojunction-Based Nonenzymatic Photoelectrochemical Sensor for Glucose Detection

Li,

Tian,

Shi

et al. 2023

Langmuir

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Compared with a single semiconductor, the heterojunction formed by two different semiconductors usually has higher light utilization and better photoelectric performance. By using stable TiO 2 nanotubes as the main subject, CdSe/TiO 2 NTs heterojunctions were synthesized by a hydrothermal method. XRD, TEM, SEM, PL, UV−vis, and EIS were used to characterize the fabricated CdSe/TiO 2 NTs. Under visible light irradiation, CdSe/TiO 2 NTs heterojunctions exhibited a higher absorption intensity and lower degree of photogenerated carrier recombination than TiO 2 . The electrons and holes were proven to be effectively separated in this heterojunction via theoretical calculation. Under CdSe/TiO 2 NTs' optimal conditions, the glucose concentrations (10−90 μM) had a linear relationship with the photocurrent value, and the detection limit was 3.1 μM. Moreover, the CdSe/ TiO 2 NTs sensor exhibited good selectivity and stability. Based on the experimental data and theoretical calculations, its PEC sensing mechanism was also illuminated.

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A research on the visible light photocatalytic activity and kinetics of CdS/CdSe co-modified TiO 2 nanotube arrays

Cited by 20 publications

References 42 publications

CdSe nanorod/TiO₂ nanoparticle heterojunctions with enhanced solar- and visible-light photocatalytic activity

CdSe nanorod/TiO₂ nanoparticle heterojunctions with enhanced solar- and visible-light photocatalytic activity

A Facile Platform for Photocatalytic Reduction of Methylene Blue Dye By CdSe-TiO2 Nanoparticles

CdSe/TiO₂NTs Heterojunction-Based Nonenzymatic Photoelectrochemical Sensor for Glucose Detection

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A research on the visible light photocatalytic activity and kinetics of CdS/CdSe co-modified TiO 2 nanotube arrays

Cited by 20 publications

References 42 publications

CdSe nanorod/TiO2 nanoparticle heterojunctions with enhanced solar- and visible-light photocatalytic activity

CdSe nanorod/TiO2 nanoparticle heterojunctions with enhanced solar- and visible-light photocatalytic activity

A Facile Platform for Photocatalytic Reduction of Methylene Blue Dye By CdSe-TiO2 Nanoparticles

CdSe/TiO2NTs Heterojunction-Based Nonenzymatic Photoelectrochemical Sensor for Glucose Detection

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Product

Resources

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CdSe nanorod/TiO₂ nanoparticle heterojunctions with enhanced solar- and visible-light photocatalytic activity

CdSe nanorod/TiO₂ nanoparticle heterojunctions with enhanced solar- and visible-light photocatalytic activity

CdSe/TiO₂NTs Heterojunction-Based Nonenzymatic Photoelectrochemical Sensor for Glucose Detection