Synthesis, Characterization and Visible Photocatalytic Performance of Iron (III) Tetracarboxyphthalocyanine-Sensitized TiO2 Photocatalyst

You, Huimin; Zhao, Yanying

doi:10.4172/2161-0398.1000199

Cited by 16 publications

(10 citation statements)

References 35 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Upon excitation with visible light, an electron–hole pair is formed in the highest occupied molecular orbital (HOMO) and lowest unoccupied molecular orbital (LUMO) of the Pc (route 1 in Fig. 18 A) [64, 65]. In ferrites, upon exposure to visible light, an electron–hole pair is formed in the conduction band (CB) and valence band (VB) respectively (route 2 in Fig.…”

Section: Resultsmentioning

confidence: 99%

Dual phototransformation of the pollutants methyl orange and Cr (VI) using phthalocyanine-cobalt ferrite based magnetic nanocomposites

Mapukata

Osifeko

Nyokong

2019

Heliyon

View full text Add to dashboard Cite

Bifunctional nanocomposites based on zinc phthalocyanines and glutathione capped CoFe 2 O 4 magnetic nanoparticles (GSH-CoFe 2 O 4 MNPs) are applied in a binary system wherein simultaneous photooxidation of methyl orange (MO) and photoreduction of Cr (VI) are conducted. The photoactivity of two zinc Pcs with different functional moieties are compared based on their interactions with GSH-CoFe 2 O 4 MNPs. Conjugation of the Pcs to the GSH-CoFe 2 O 4 MNPs not only enhanced their singlet oxygen production but also their photocatalytic activity in both photooxidation and photoreduction experiments. Using electron paramagnetic resonance (EPR) spectroscopy, the Pc-MNP conjugates reported herein were found to exhibit superparamagnetic behaviour, giving the advantage of easy separation using an external magnetic field post application, an attractive attribute for heterogeneous catalysis. The catalysts reported herein are therefore good candidates as catalysts for real life water purification analyses as they facilitate the treatment of both organic and inorganic water pollutants.

show abstract

Section: Resultsmentioning

confidence: 99%

Dual phototransformation of the pollutants methyl orange and Cr (VI) using phthalocyanine-cobalt ferrite based magnetic nanocomposites

Mapukata

Osifeko

Nyokong

2019

Heliyon

View full text Add to dashboard Cite

show abstract

“…Its main advantages are its optical properties (a high refractive index, and transparency in the visible and NIR range) and its mechanical, physical and chemical properties (photocatalytic properties). The advantages of depositing TiO 2 coatings in the form of thin films have been demonstrated in many fields, including energy [ 11 ], photocatalysis [ 12 , 13 , 14 , 15 , 16 , 17 ], electronics [ 18 , 19 ], health [ 20 ], and optics [ 21 , 22 , 23 ]. Additionally, the coatings can be micro-nanostructured, thereby giving them new functionalities and properties, e.g., improved absorption efficiency [ 24 ], hydrophobicity and enhanced tribological properties [ 25 ].…”

Section: Introductionmentioning

confidence: 99%

Influence of the Micro-Nanostructuring of Titanium Dioxide Films on the Photocatalytic Degradation of Formic Acid under UV Illumination

et al. 2022

View full text Add to dashboard Cite

Surface micro-nanostructuring can provide new functionalities and properties to coatings. For example, it can improve the absorption efficiency, hydrophobicity and/or tribology properties. In this context, we studied the influence of micro-nanostructuring on the photocatalytic efficiency of sol-gel TiO2 coatings during formic acid degradation under UV illumination. The micro-nanostructuring was performed using the UV illumination of microspheres deposited on a photopatternable sol-gel layer, leading to a hexagonal arrangement of micropillars after development. The structures and coatings were characterized using Raman spectroscopy, ellipsometry, atomic force microscopy and scanning electron microscopy. When the sol-gel TiO2 films were unstructured and untreated at 500 °C, their effect on formic acid’s degradation under UV light was negligible. However, when the films were annealed at 500 °C, they crystallized in the anatase phase and affected the degradation of formic acid under UV light, also depending on the thickness of the layer. Finally, we demonstrated that surface micro-nanostructuring in the form of nanopillars can significantly increase the photocatalytic efficiency of a coating during the degradation of formic acid under UV light.

show abstract

“…Nonetheless, the XRD spectra of Eosin Ysensitized (25% ZF-GCN) and the unsensitized (25% ZF-GCN) hybrids were almost identical. Tis could imply that dye sensitization at small concentrations has little efect on the crystalline structure of the composite, and they interact through van der Waals or hydrogen bond as reported for similar studies involving dye sensitization [29].…”

Section: Resultsmentioning

confidence: 87%

“…Dye sensitization is a promising approach since dye molecules can be excited at long wavelengths by visible light photons to produce electrons from its HOMO band (highest occupied molecular orbital), which is passed to its LUMO band (lowest unoccupied molecular orbital) and subsequently injected to the conduction band of the semiconductor [27,28]. Tese injected electrons then react with adsorbed oxygen molecules on the surface of the photocatalyst to form superoxide, hydroxyl, and other active species [29]. Eosin Y is an anthracene-based dye with a high optical absorption coefcient necessary for the absorption of visible light at long light wavelengths [30].…”

Section: Introductionmentioning

confidence: 99%

Synthesis, Characterization, and Photocatalytic Performance of ZnFe2O4-g-C3N4 Composites for Tetracycline Removal from Contaminated Water

Samuel,

M’Arimi,

Achisa Mecha

2024

Journal of Nanotechnology

View full text Add to dashboard Cite

The presence of emerging contaminants in wastewater like tetracycline poses a significant challenge in water reuse worldwide. The implementation of a p-n heterojunction and dye-sensitized techniques in the enhancement of graphite carbon nitride provides a promising alternative for visible light-driven degradation of emerging contaminants present in wastewater. The present study investigated dye-sensitized and plain composites in degrading tetracycline using natural sunlight in a parabolic trough reactor. The study synthesized four composites of ZnFe2O4-g-C3N4 at 5, 15, and 25 wt% loading of the ferrite by direct annealing of melamine, followed by thermal and ultrasonic exfoliation of bulk graphite carbon nitride and in situ precipitation with zinc ferrites to yield a composite photocatalyst. The photocatalysts were characterized using X-ray diffraction (XRD) analyses which confirmed that all the spinel ferrite phases of ZnFe2O4 were well bonded with g-C3N4 nanosheets to form a composite. The crystallite sizes were calculated by the Debye–Scherrer equation indicating crystal sizes of between 4.63 and 8.61 nm confirming the nanostructures. The scanning electron microscope-energy dispersive spectroscopy (SEM-EDX) tests verified that the spherical globules of ZnFe2O4 were well attached to the mesoporous layers of g-C3N4 and absence of contaminant phases. The UV-Vis analysis for 25% ZF-GCN revealed a band gap reduction from 2.67 eV to 2.03 eV. The PL intensity for all the composites decreased at excitation of 266 nm and 550 nm which was evidence for suppressed charge recombination. A 25% ferrite loading resulted in the best photocatalytic performance with tetracycline degradation of 93.64% and total organic carbon (TOC) removal of 51.89%. The sensitization of the 25% ZF-GCN composite with Eosin Y further improved its performance for degradation of tetracycline to 94.62% and TOC removal to 68.29%. Therefore, dye sensitization is an efficient way of improving the photocatalytic activity of a multicomponent photocatalyst for the removal of emerging pollutants.

show abstract

Synthesis, Characterization and Visible Photocatalytic Performance of Iron (III) Tetracarboxyphthalocyanine-Sensitized TiO2 Photocatalyst

Cited by 16 publications

References 35 publications

Dual phototransformation of the pollutants methyl orange and Cr (VI) using phthalocyanine-cobalt ferrite based magnetic nanocomposites

Dual phototransformation of the pollutants methyl orange and Cr (VI) using phthalocyanine-cobalt ferrite based magnetic nanocomposites

Influence of the Micro-Nanostructuring of Titanium Dioxide Films on the Photocatalytic Degradation of Formic Acid under UV Illumination

Synthesis, Characterization, and Photocatalytic Performance of ZnFe2O4-g-C3N4 Composites for Tetracycline Removal from Contaminated Water

Contact Info

Product

Resources

About