Highly active zinc oxide-supported lithium oxide catalyst for solvent-free Knoevenagel condensation

Sunkara, Prasad S.; Masula, Keshavulu; Veerasomaiah, P.; Yadagiri, B.; Pasala, Vijay Kumar; Manohar, B.

doi:10.1007/s12039-021-01941-2

Cited by 10 publications

(6 citation statements)

References 36 publications

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“…These values were found to coincide with that of a wurtzite structure of ZnO nanoparticles in its pure form (JCPDS no. 36-1415) upon comparison with XRD spectra of ZnO nanoparticles present in the already reported literature . From the XRD spectra analysis, it is evident that the peak corresponding to (1, 0, 1) plane shows a higher intensity as compared to the rest of the peaks, thus indicating its preferential growth pattern toward that plane for the crystal growth .…”

Section: Results and Discussionmentioning

confidence: 76%

“…36-1415) upon comparison with XRD spectra of ZnO nanoparticles present in the already reported literature. 49 From the XRD spectra analysis, it is evident that the peak corresponding to (1, 0, 1) plane shows a higher intensity as compared to the rest of the peaks, thus indicating its preferential growth pattern toward that plane for the crystal growth. 50 As there are no undesirable peaks present in the XRD spectra, it underlines the high purity of the sosynthesized L-ZnO, S-ZnO and Sc-ZnO nanoparticles.…”

Section: Resultsmentioning

confidence: 98%

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Non-antimicrobial and Non-anticancer Properties of ZnO Nanoparticles Biosynthesized Using Different Plant Parts of Bixa orellana

2022

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As traditional cancer therapy is toxic to both normal and cancer cells, there is a need for newer approaches to specifically target cancer cells. ZnO nanoparticles can be promising due their biocompatible nature. However, ZnO nanoparticles have also shown cytotoxicity against mammalian cells in some cases, because of which there is a need for newer synthesis approaches for biocompatible ZnO nanoparticles to be used as carrier molecules in drug delivery applications. Here, we report the biosynthesis of ZnO nanoparticles using different plant parts (leaf, seed, and seed coat) of Bixa orellana followed by different characterizations. The UV−visible spectra of ZnO showed absorption maxima at 341 and 353 nm, 378 and 373 nm, and 327 and 337 nm, respectively, before and after calcination corresponding to the band gap energy of 3.636 and 3.513 eV, 3.280 and 3.324 eV, and 3.792 and 3.679 eV for L-ZnO, S-ZnO, and Sc-ZnO, respectively. Xray diffraction analysis confirmed the formation of hexagonal wurtzite structures. Attenuated total reflectance infrared spectra revealed the presence of stretching vibrations of C−C, CC, CO, and NH 3 + groups along with C−H deformation involving biomolecules from extracts responsible for reduction and stabilization of nanoparticles. Field emission scanning electron microscopy and transmission electron microscopy images showed spherical and almond-like morphologies of L-ZnO and Sc-ZnO with spherical morphologies, whereas S-ZnO showed almond-like morphologies. The presence of antibacterial activity was observed in L-ZnO against Staphylococcus aureus and Bacillus subtilis, in S-ZnO nanoparticles only against Escherichia coli, and in Sc-ZnO only against Staphylococcus aureus. Uncalcinated ZnO nanoparticles showed weak antibacterial activities, whereas calcinated ZnO nanoparticles showed a non-antibacterial nature. The antifungal activity against different fungi (Penicillium sp., Aspergillus flavus, Fusarium oxysporum, and Rhizoctonia solani) and cytotoxicity against HCT-116 cancer cells were not observed before and after calcination in all three ZnO nanoparticles. The antimicrobial nature and biocompatibility of ZnO nanoparticles were influenced by different parameters of the nanoparticles along with microorganisms and the human cells. Non-antimicrobial properties of ZnO nanoparticles can be treated as a pre-requisite for its biocompatibility due to its inert nature. Thus, biosynthesized ZnO nanoparticles showed a nontoxic nature, which can be exploited as promising alternatives in biomedical applications.

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Section: Results and Discussionmentioning

confidence: 76%

Section: Resultsmentioning

confidence: 98%

Non-antimicrobial and Non-anticancer Properties of ZnO Nanoparticles Biosynthesized Using Different Plant Parts of Bixa orellana

2022

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“…2(a) & Fig. 2(e)) reveals a vibrational band matching to Li-O [32]. This indicates that there is presence of lithium oxide in the ZnO lattice with PPy.…”

Section: Edx Analysismentioning

confidence: 70%

“…The composites PZL0, PZL2, PZL4, PZL6, PZL8, and PZL10 as shown in Fig. 3(a-e) lacks the presence of Li [32]. Although the catalyst is more effective than pure ZnO, FTIR of PPy/ZnO NPs-Li 2 O (Fig.…”

Section: Edx Analysismentioning

confidence: 96%

Structural and Humidity Sensing Properties of Polypyrrole composites containing Li2O and ZnO nanoparticles

Madival¹,

Prashantkumar²,

Nagaraja³

et al. 2023

Preprint

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We report the structural properties and humidity sensing abilities of polypyrrole (PPy) composites containing ZnO nanoparticles (NPs) and Li2O. The PPy was synthesized following chemical oxidation method. The PPy50-ZnO(NPs) 50- Li2O x (where x = 0,2,4,6,8 & 10) composites were prepared by physical mixing using ball-milling method. The as-prepared composites were subjected to XRD, FTIR and EDAX. The structural analysis using these tools hinted at the presence of Li2O in the composites and the effect of variation of Li2O in the composites is emphasized. The humidity sensing ability of pristine PPy and the composites has been investigated, at room temperature, by measuring the change in electrical resistance of the sample due to the variation in relative humidity from 11–97% RH. The response to humidity and recovery times were determined. The mechanism of humidity sensing in these composites was understood by Grotthus theory. Among all the composites, the composite x = 10 (PZL10) has exhibited very good response and recovery time and has the potential to be used as a low-cost and highly effective humidity sensor.

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“…3a). 46 After the reaction, the polymer P1 was obtained by precipitation in hexane/ether. The quantitative post-polymerization modification was confirmed by 1 H NMR as the 1H proton at 10 ppm of CHO from azo-aldehyde group of p(DMA- co -azo-aldehyde) disappeared and a new peak ( a ′) from the vinyl group next to dicyano appeared at 8.0 ppm (Fig.…”

Section: Resultsmentioning

confidence: 99%

A water-soluble azobenzene-dicyano pendant polymeric chemosensor for the colorimetric detection of cyanide in 100% aqueous media and food samples

Sharma

Lee

2022

New J. Chem.

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Highly active zinc oxide-supported lithium oxide catalyst for solvent-free Knoevenagel condensation

Cited by 10 publications

References 36 publications

Non-antimicrobial and Non-anticancer Properties of ZnO Nanoparticles Biosynthesized Using Different Plant Parts of Bixa orellana

Non-antimicrobial and Non-anticancer Properties of ZnO Nanoparticles Biosynthesized Using Different Plant Parts of Bixa orellana

Structural and Humidity Sensing Properties of Polypyrrole composites containing Li2O and ZnO nanoparticles

A water-soluble azobenzene-dicyano pendant polymeric chemosensor for the colorimetric detection of cyanide in 100% aqueous media and food samples

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