Comparative analysis on optical and photocatalytic properties of chlorophyll/curcumin-sensitized $$\mathrm{TiO}_{2}$$ nanoparticles for phenol degradation

Haghighatzadeh, Azadeh

doi:10.1007/s12034-019-2016-9

Cited by 21 publications

(8 citation statements)

References 49 publications

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“…These data show a decrease in the bandgap energy of the TiO2 material after combining with both curcumin and curcumin complex compounds. The Egap of TiO2/curcumin (2.82 eV) was within the range of previously reported values [9,20,21]. The TiO2/Mg 2+ -curcumin material shows tremendous bandgap energy than TiO2/curcumin, although it is still slightly smaller than TiO2 itself.…”

Section: Bandgap Energy Of Tio2/m-curcumin (M= Na + Mg 2+ Cu 2+ )supporting

confidence: 86%

“…The most significant reduction in Egap was seen in TiO2/Cu 2+ -Molar Absorptivity, curcumin, then TiO2/Na + -curcumin. Similar observations have been reported for chlorophyll complexes, where the insertion of Cu 2+ -chlorophyll and Fe 3+ -chlorophyll compounds onto the surface of TiO2 causes a decrease in the TiO2 bandgap energy [14,21]. Based on the observational data in this study, it can be seen that the trend of decreasing the bandgap energy of TiO2 seems the same as the light absorption value of the sensitizer molecules in solution in which the material indicates the highest decrease in the Egap value with the highest ability to absorb light, namely Cu 2+ -curcumin.…”

Section: Bandgap Energy Of Tio2/m-curcumin (M= Na + Mg 2+ Cu 2+ )supporting

confidence: 85%

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Bandgap Energy of TiO2/M-Curcumin Material (M = Na+, Mg2+, Cu2+)

et al. 2022

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Bandgap energy (Egap) of TiO2/curcumin as well as TiO2/M-curcumin (M = Na+, Mg2+, Cu2+) was determined. The material was prepared on transparent conductive oxide as TiO2 film. Then, the curcumin and curcumin derivatives were adsorbed on TiO2 surface by immersing the film in solution of the compounds. The diffuse reflectance UV-Vis spectra of the materials were recorded and utilized to calculate the Egap using the Tauc plot method. The calculation gave the Egap of TiO2 of 3.27 eV that lowers after being deposited with curcumin and metal-curcumin compounds. The Egap of TiO2/curcumin was 2.82 eV, while TiO2/Na+-curcumin, TiO2/Mg2+-curcumin, and TiO2/Cu2+-curcumin were 2.36, 3.11, and 2.15 eV, respectively. Curcumin metal complexes, i.e., TiO2/Cu2+-curcumin, showed high molar absorptivity and effectively deposited on the TiO2 lowers the bandgap energy of TiO2 compared to free-curcumin on TiO2.

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Section: Bandgap Energy Of Tio2/m-curcumin (M= Na + Mg 2+ Cu 2+ )supporting

confidence: 86%

Section: Bandgap Energy Of Tio2/m-curcumin (M= Na + Mg 2+ Cu 2+ )supporting

confidence: 85%

Bandgap Energy of TiO2/M-Curcumin Material (M = Na+, Mg2+, Cu2+)

et al. 2022

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“…Nano titanium dioxide can be used in biomedical and bioengineering applications due to its special properties and high reactivity [23]. Curcumin was recently used to sensitize TiO 2 for improved photodegradation of dyes [24] and photodegradation of phenols [25]. In addition, a complex of titanium dioxide nanoparticles with curcumin was developed as a wound dressing material using chitosan and polypropylene fabric [26].…”

Section: Introductionmentioning

confidence: 99%

Antibacterial and UV Protection Properties of Modified Cotton Fabric Using a Curcumin/TiO2 Nanocomposite for Medical Textile Applications

et al. 2021

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Medical textiles are one of the most rapidly growing parts of the technical textiles sector in the textile industry. This work aims to investigate the medical applications of a curcumin/TiO2 nanocomposite fabricated on the surface of cotton fabric. The cotton fabric was pretreated with three crosslinking agents, namely citric acid, 3-Chloro-2-hydroxypropyl trimethyl ammonium chloride (Quat 188) and 3-glycidyloxypropyltrimethoxysilane (GPTMS), by applying the nanocomposite to the modified cotton fabric using the pad-dry-cure method. The chemistry and morphology of the modified fabrics were examined by Fourier transform infrared spectroscopy, energy-dispersive X-ray spectroscopy, and scanning electron microscopy. In addition, the chemical mechanism for the nanocomposite-modified fabric was reported. UV protection (UPF) and antibacterial properties against Gram-positive S. aureus and Gram-negative E. coli bacterial strains were investigated. The durability of the fabrics to 20 washing cycles was also examined. Results demonstrated that the nanocomposite-modified cotton fabric exhibited superior antibacterial activity against Gram-negative bacteria than Gram-positive bacteria and excellent UV protection properties. Moreover, a good durability was obtained, which was possibly due to the effect of the crosslinker used. Among the three pre-modifications of the cotton fabric, Quat 188 modified fabric revealed the highest antibacterial activity compared with citric acid or GPTMS modified fabrics. This outcome suggested that the curcumin/TiO2 nanocomposite Quat 188-modified cotton fabric could be used as a biomedical textile due to its antibacterial properties.

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“…TiO 2 naturally exhibits three different polymorphs, in which there is a strong influence of the conditions used in the reaction processing, mainly, method of synthesis, temperature, pH, solvent and presence of surfactants 20–22 . Therefore, the anatase phase (I41/amd) exhibits a thermodynamically stable tetragonal type structure until close to 500°C, and has two formulas per unit cell ( z = 2) 16 .…”

Section: Introductionmentioning

confidence: 99%

Nanoscale morphology and fractal analysis of TiO₂ coatings on ITO substrate by electrodeposition

Amâncio

Pinto

Matos

et al. 2021

Journal of Microscopy

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In this paper, we introduced an advanced discussion of the 3D morphology of TiO2 coatings deposited on ITO substrate by electrodeposition under different deposition times. Atomic force microscopy was applied for obtaining topographic images of the samples. The images were processed using the MountainsMap 8.0 commercial software according to ISO 25178‐2:2012. Moreover, fractal theory was applied to study the surface microtexture of coatings. The morphology was affected by the deposition time, where the grain size decreased with the increase of the time, making film's surfaces smoother. In addition, the surface roughness exhibited a random behaviour, but does not presented significant difference between samples. The fractal dimension showed similar values for all coatings. In contrast, surface texture isotropy also exhibited random behaviour. However, advanced fractal parameters revealed that when the deposition time increased, the coatings microtexture has become uniform and less porous. Furthermore, all coatings presented high topographic uniformity, regardless of deposition time. These results revealed that the morphology and microtexture of TiO2‐based coatings can be controlled by the deposition time. Lay Description An advanced characterization on the micromorphology of 3D morphology, using AFM images, of Titanium dioxide (TiO2) coatings deposited on ITO substrate by electrodeposition under different deposition times. TiO2 is one of the most studied semiconductors to make photovoltaic devices. The versatility of this semiconductor is associated with low toxicity, high photochemical stability, abundance, and the facility to obtain by conventional synthesis routes. The obtention of a homogeneous and stable layer in the semiconductor TiO2 film deposition is a crucial stage in the assembly of sensitized photovoltaic devices. Atomic Force Microscopy (AFM) is a technique which can magnify up to a billion times and it uses a tip or probe which touches the sample surface point by point. The tip deflection is interpreted as the surface topography by the software, producing 2D or 3D images that generate several tribological parameters such as roughness in respect to a scanned area, has been a technique widely reported in the morphological characterization, determination of thickness, roughness, and particle size in thin films. Therefore, in this paper, the morphology was studied by atomic force microscopy using MountainsMap commercial software. The main goal was to study the influence of the deposition time on the morphology and microtexture of the material. New parameters such as surface entropy, fractal succolarity and fractal lacunarity were obtained for studying coatings microtexture's complexity.

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Comparative analysis on optical and photocatalytic properties of chlorophyll/curcumin-sensitized $$\mathrm{TiO}_{2}$$ nanoparticles for phenol degradation

Cited by 21 publications

References 49 publications

Bandgap Energy of TiO2/M-Curcumin Material (M = Na+, Mg2+, Cu2+)

Bandgap Energy of TiO2/M-Curcumin Material (M = Na+, Mg2+, Cu2+)

Antibacterial and UV Protection Properties of Modified Cotton Fabric Using a Curcumin/TiO2 Nanocomposite for Medical Textile Applications

Nanoscale morphology and fractal analysis of TiO₂ coatings on ITO substrate by electrodeposition

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Comparative analysis on optical and photocatalytic properties of chlorophyll/curcumin-sensitized $$\mathrm{TiO}_{2}$$ nanoparticles for phenol degradation

Cited by 21 publications

References 49 publications

Bandgap Energy of TiO2/M-Curcumin Material (M = Na+, Mg2+, Cu2+)

Bandgap Energy of TiO2/M-Curcumin Material (M = Na+, Mg2+, Cu2+)

Antibacterial and UV Protection Properties of Modified Cotton Fabric Using a Curcumin/TiO2 Nanocomposite for Medical Textile Applications

Nanoscale morphology and fractal analysis of TiO2 coatings on ITO substrate by electrodeposition

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Nanoscale morphology and fractal analysis of TiO₂ coatings on ITO substrate by electrodeposition