ZnO Nanoparticles from Different Precursors and Their Photocatalytic Potential for Biomedical Use

Gatou, Maria-Anna; Lаgopati, Nefeli; Vagena, Ioanna-Aglaia; Gazouli, Maria; Pavlatou, Evangelia A.

doi:10.3390/nano13010122

Cited by 41 publications

(35 citation statements)

References 69 publications

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“…The peaks position of these crystals in the XRD pattern of ceramic powder somewhat differ from standard values, however, this difference is not significant. Such variations of peaks positions are observed in the XRD patterns of ZnO crystals prepared using low-temperature methods [13]. Thus, the XRD data indicate the formation of ZnO crystals as the main crystal phase in the obtained powder and coating.…”

Section: Xrd Analysismentioning

confidence: 67%

“…Photocatalytic materials are used in many different practical applications (water and air purification, sensors, water splitting, etc.) and are the object of intensive investigations [1][2][3][4][5][6][7][8][9][10][11][12][13][14]. Many oxide semiconductor materials are effective photocatalysts, demonstrate antibacterial activity and have an excellent thermal stability and chemical durability.…”

Section: Introductionmentioning

confidence: 99%

“…Ceramic materials (powders and coatings) based on ZnO are very effective photocatalysts [2][3][4][5][6][7][8][9][10][11][12][13][14] which have been successfully tested in industrial conditions [1]. Modification of the ZnO ceramic materials using other oxides additions provides a significant enhancement to its photocatalytic and bactericidal characteristics [3][4][5][6][7][8].…”

Section: Introductionmentioning

confidence: 99%

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Ceramic ZnO-SnO2-Fe2O3 Powders and Coatings -Effective Photogenerators of Reactive Oxygen Species

et al. 2023

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Ceramic ZnO-SnO2-Fe2O3 powders and transparent coatings on glasses prepared using the non-isothermal polymer-salt method demonstrate a strong ability to generate chemically active oxygen species under UV and visible irradiation. Crystal structures and morphologies of these materials were studied using the XRD and the SEM analysis. It was found that there are significant differences in the crystal structure of ceramic powders and thin coatings. The powders consist of randomly oriented oxide nanocrystals of size ~47 nm. The strong orientation of the ZnO nanocrystals due to their interaction with the glass substrate is observed in the coating structure. Experimental data show that thin ceramic coatings are transparent (~90%) in the visible spectral range and the band gap of the ceramic material is 3.44 eV. The band gap value of this multi-component ceramic material is described sufficiently using Verlag’s law. Ceramic powders and coatings demonstrate the intensive photogeneration of reactive oxygen species, both in liquid and air. High photocatalytic activity of ZnO-SnO2-Fe2O3 ceramic coatings and powders was observed upon the oxidation of the diazo dye, Chicago Sky Blue. In the presence of transparent photocatalytic coating, the value of the constant rate of the dye photodecomposition was high (k = 0.056 min−1). It was found that, in spite of their short life time, photogenerated reactive oxygen species demonstrate the ability to decompose dye molecules located up to a distance of 0.5 mm from the surface of ceramic coating. Obtained experimental results suggest that the prepared ceramic materials are promising for different practical applications of the photocatalytic materials.

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Section: Xrd Analysismentioning

confidence: 67%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Ceramic ZnO-SnO2-Fe2O3 Powders and Coatings -Effective Photogenerators of Reactive Oxygen Species

et al. 2023

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“…All examined ZnO samples presented absorbance bands, characterized by an absorption edge of <385 nm, which is habitual for the wurtzite crystal phase of ZnO. These bands correspond to the O 2p →Zn 3d electron transition from the VB to the CB [42]. The DRS measurements of the produced ZnO samples are illustrated in Figure 2a-d.…”

Section: Diffuse Reflectance Uv-vis Spectroscopy Analysis (Drs)mentioning

confidence: 94%

Optimization of ZnO Nanoparticles’ Synthesis via Precipitation Method Applying Taguchi Robust Design

Gatou,

Kontoliou,

Volla

et al. 2023

Catalysts

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Zinc oxide (ZnO) possesses exceptional potential to be utilized in water and wastewater treatment applications, either as a photocatalyst or in membrane incorporation. In the present study, ZnO nanoparticles were synthesized using the precipitation method. The Taguchi approach with the L32b orthogonal array was utilized in order to optimize the experimental conditions for the synthesis of the nanoparticles and to ensure that relatively smaller-sized particles were obtained. The design was characterized by ten factors, where nine of them possessed four levels, while one had two levels. This study’s design factors were the type of Zn precursor, the concentration of the Zn precursor, the type of precipitating agent, the precipitation agent’s concentration, the type of utilized solvent, the pH value of the solvent, the temperature used during the synthetic procedure, the calcination temperature, the time of stirring during synthesis, as well as the stirring speed. The influences of those factors on the selected response parameters (the average crystallite size, degree of crystallinity, energy band gap (Eg), and photodegradation constant (k)) were then evaluated. XRD analysis and the calculated Eg values indicated that the hexagonal wurtzite structure was the only crystalline phase present in the produced samples. The photocatalytic efficiency of all ZnO nanoparticles was examined in the degradation of rhodamine B under UV light irradiation. The optimal conditions were achieved using zinc acetate dihydrate as the Zn precursor at a concentration equal to 0.3 M, sodium hydroxide as the precipitating agent (1.5 M), methanol as the solvent (the pH value of the solvent was equal to 13), a temperature during the synthetic procedure of 70 °C, 600 °C as calcination temperature, a 90 min stirring time, and 700 rpm as the stirring speed. The optimized ZnO sample was synthesized based on the aforementioned conditions and thoroughly characterized. The acquired results confirmed the prediction of the Taguchi approach, and the most enhanced k-value was observed.

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“…Although OS is a condition that has generally been connected to several diseases, it may be therapeutically exploited when it is controllably induced. Therefore, photocatalytic nanoparticles, such as titanium dioxide, or composite thermo-responsive titania-based materials [76], zinc oxide [77], etc., can be used as photo-activated anticancer agents to target cancer cells and induce oxidative-stress-mediated apoptosis [73], an improved photodynamic therapy [73].…”

Section: Nanomaterials and Induction Of Oxidative Stress As A Therape...mentioning

confidence: 99%

The Dual Role of Oxidative-Stress-Induced Autophagy in Cellular Senescence: Comprehension and Therapeutic Approaches

et al. 2023

Self Cite

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The contemporary lifestyle of the last decade has undeniably caused a tremendous increase in oxidative-stress-inducing environmental sources. This phenomenon is not only connected with the rise of ROS levels in multiple tissues but is also associated with the induction of senescence in different cell types. Several signaling pathways that are associated with the reduction in ROS levels and the regulation of the cell cycle are being activated, so that the organism can battle deleterious effects. Within this context, autophagy plays a significant role. Through autophagy, cells can maintain their homeostasis, as if it were a self-degradation process, which removes the “wounded” molecules from the cells and uses their materials as a substrate for the creation of new useful cell particles. However, the role of autophagy in senescence has both a “dark” and a “bright” side. This review is an attempt to reveal the mechanistic aspects of this dual role. Nanomedicine can play a significant role, providing materials that are able to act by either preventing ROS generation or controllably inducing it, thus functioning as potential therapeutic agents regulating the activation or inhibition of autophagy.

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ZnO Nanoparticles from Different Precursors and Their Photocatalytic Potential for Biomedical Use

Cited by 41 publications

References 69 publications

Ceramic ZnO-SnO2-Fe2O3 Powders and Coatings -Effective Photogenerators of Reactive Oxygen Species

Ceramic ZnO-SnO2-Fe2O3 Powders and Coatings -Effective Photogenerators of Reactive Oxygen Species

Optimization of ZnO Nanoparticles’ Synthesis via Precipitation Method Applying Taguchi Robust Design

The Dual Role of Oxidative-Stress-Induced Autophagy in Cellular Senescence: Comprehension and Therapeutic Approaches

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