Effect of morphology, crystallite size and optical band gap on photocatalytic activity of ZnO nanostructures for decolorization of R6G

Kumar, S. S.; Rao, V. Ranga; Rao, G. Nageswara

doi:10.1016/j.matpr.2022.04.220

Cited by 5 publications

(4 citation statements)

References 29 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Furthermore, upon Fe-doping of ZnO (and to a lesser degree, variation of the Ag-seed concentration), diffraction peaks shifted substantially relative to plain ZnO, indicating changes in the unit cell parameters. The observed decreased crystallite size with both increased seeding concentration as well as dopant concentration, were perhaps due to a combination of abnormal grain growth and Zener pinning contributions. , …”

Section: Resultsmentioning

confidence: 93%

“…The observed decreased crystallite size with both increased seeding concentration as well as dopant concentration, were perhaps due to a combination of abnormal grain growth and Zener pinning contributions. 73,74 Le Bail refinements of experimental data were carried out on patterns comprising solely ZnO (i.e., absent any other confounding peaks), in order to obtain reliable results. Modeling revealed changes in unit cell change as a result of coating composition variation.…”

mentioning

confidence: 99%

See 1 more Smart Citation

Sonochemical Coating of Textiles with Zinc Oxide: Robust, Silver-Seeded Growth on Cotton for Effective UV Shielding

Noor,

Mutalik,

Younas

et al. 2023

ACS Appl. Eng. Mater.

View full text Add to dashboard Cite

We report on the in situ silver-seeded generation and growth of pure wurtzite zinc oxide (ZnO) onto woven cotton fabric substrates via sonochemical deposition. Coating leaching issues and limitations related to processing temperature often restrict the direct application of crystalline metal oxides onto soft matter substrates under ambient conditions. Herein, we describe a mechanochemical synthesis route that allows for the direct generation and durable incorporation of crystalline metal and metal oxide materials onto polymeric substrates, at high loading, without the use of binders, annealing steps, low-vacuum processing, or any other conventionally encountered processing procedures. The model system of Ag-seeded, ZnO on woven cotton textile fabrics presented here demonstrates this efficacy while further doping of the system with Fe allows for the ZnO coating optical properties to be readily tuned. Samples were characterized with X-ray diffraction, scanning electron microscopy, transmission electron microscopy, X-ray photoelectron spectroscopy, UV−vis transmittance-reflectance spectroscopy, inductively coupled plasma optical emission spectroscopy, as well as air permeability and tensile testing. While the results for this model system show excellent crystallinity, attachment durability/washfastness, and tunable optical parameters, this synthesis method also offers broader routes to the ready incorporation of textured crystalline metal, metal oxide, and other systems into low-temperature stable, soft matter substrates. For the illustrative application of UV-blocking capability, the coated substrates output consistently high UV-protection factor values (>UPF50), even after 51 wash laundering cycles, and with near-complete suppression of UV-A and UV-B radiation.

show abstract

Section: Resultsmentioning

confidence: 93%

mentioning

confidence: 99%

Sonochemical Coating of Textiles with Zinc Oxide: Robust, Silver-Seeded Growth on Cotton for Effective UV Shielding

Noor,

Mutalik,

Younas

et al. 2023

ACS Appl. Eng. Mater.

View full text Add to dashboard Cite

show abstract

“…For nanomaterials, the presence of nanocrystals is also considered an important contribution to their final properties in specific applications. It has been reported that the crystallite size influences, for instance, the photocatalytic activity of ZnO nanoparticles [ 34 ]. From the calculations made for the three nanomaterials, no significant changes were observed in the crystallite size of ZnO-50 and ZnO-100 due to the different concentrations of the extract.…”

Section: Discussionmentioning

confidence: 99%

Antifungal Activity of ZnO Nanoparticles Synthesized from Eichhornia crassipes Extract for Construction Applications

Vargas Hernández,

Alvarez Lemus,

De la Rosa García

et al. 2024

Nanomaterials

View full text Add to dashboard Cite

Fungal growth on construction materials in tropical climates can degrade aesthetics and manifestations on modern and historical sick buildings, affecting the health of their inhabitants. This study synthesized ZnO nanoparticles with enhanced antifungal properties using a precipitation method. Different concentrations (25%, 50%, and 100%) of Eichhornia crassipes aqueous extract were used with Zn(NO3)2·6H2O as the precursor to evaluate their spectroscopic, morphological, textural, and antifungal properties. X-ray diffraction confirmed the hexagonal wurtzite phase of ZnO with crystallite sizes up to 20 nm. Fourier-transform infrared spectroscopy identified absorption bands at 426, 503, and 567 cm−1 for ZnO-100, ZnO-50, and ZnO-25, respectively. Nitrogen physisorption indicated a type II isotherm with macropores and a fractal dimension coefficient near 2 across all concentrations. Polydispersity index analysis showed that ZnO-50 had a higher PDI, indicating a broader size distribution, while ZnO-25 and ZnO-100 exhibited lower PDI values, reflecting uniform and monodisperse particle sizes. FESEM observations revealed semi-spherical ZnO morphologies prone to agglomeration, particularly in ZnO-25. Antifungal tests highlighted ZnO-25 as the most effective, especially against Phoma sp. with an MFC/MIC ratio of 78 µg/mL. Poisoned plate assays demonstrated over 50% inhibition at 312 µg/mL for all tested fungi, outperforming commercial antifungals. The results indicate that ZnO NPs synthesized using E. crassipes extract effectively inhibit fungal growth on construction materials. This procedure offers a practical approach to improving the durability of building aesthetics and may contribute to reducing the health risks associated with exposure to fungal compounds.

show abstract

“…However, the transmittance in the visible domain was greater than 75% for all samples. The direct bandgaps of nanocomposites structures were estimated from the graph of hν versus (αhν) 2 , for the absorption coefficient α that is related to the bandgap Eg as (αhν) 2 = k (hν − Eg), where hν is the incident light energy and k is a constant [35]. An example of the graphical estimation of the bandgap for 90ZnO10P 2 O5rGO is presented in Figure 4.…”

Section: Uv-vis-nir Spectroscopy Investigationsmentioning

confidence: 99%

Effect of P2O5 Content on Luminescence of Reduced Graphene-Oxide-Doped ZnO–P2O5 Nano-Structured Films Prepared via the Sol–Gel Method

Vasiliu,

Filip,

Chilibon

et al. 2023

Materials

View full text Add to dashboard Cite

A convenient and low-cost sol–gel approach for the one-step synthesis of ZnO–P2O5–rGO nanostructures with tuned bandgap and fluorescence was investigated. The obtained hybrid nanostructures exploit the properties of zinc oxide, graphene oxide and phosphorous oxide as promising candidates for a wide range of optoelectronic applications. A predominant amorphous structure, ZnO–P2O5–rGO, containing ZnO nanorods was evidenced by X-ray diffraction analysis (XRD) and scanning electron microscopy (SEM). The estimated size of the ZnO nanorods in nanostructures with P2O5 was noticed to decrease when the P2O5/ZnO ratio was increased. The presence of ZnO, P2O5 and rGO was confirmed by Fourier-transform infrared spectroscopy (FTIR) and Raman investigation. P2O5 was noticed to tune the bandgap and the fluorescence emissions of the nanostructured films, as estimated by UV–Vis–NIR and fluorescence spectroscopy, respectively. The electrical measurements performed at room temperature showed that the main influence on the film’s resistivity does not come from the 1% rGO doping but from the P2O5/ZnO ratio. It was found that a 10/90 molar ratio of P2O5/ZnO decreases the resistivity almost seven-fold compared with rGO-doped ZnO films.

show abstract

Effect of morphology, crystallite size and optical band gap on photocatalytic activity of ZnO nanostructures for decolorization of R6G

Cited by 5 publications

References 29 publications

Sonochemical Coating of Textiles with Zinc Oxide: Robust, Silver-Seeded Growth on Cotton for Effective UV Shielding

Sonochemical Coating of Textiles with Zinc Oxide: Robust, Silver-Seeded Growth on Cotton for Effective UV Shielding

Antifungal Activity of ZnO Nanoparticles Synthesized from Eichhornia crassipes Extract for Construction Applications

Effect of P2O5 Content on Luminescence of Reduced Graphene-Oxide-Doped ZnO–P2O5 Nano-Structured Films Prepared via the Sol–Gel Method

Contact Info

Product

Resources

About