One-step synthesis of strongly confined, defect-free and hydroxy-terminated ZnO quantum dots

Jain, Gunisha; Rocks, Conor; Maguire, Paul; Mariotti, Davide

doi:10.1088/1361-6528/ab72b5

Cited by 25 publications

(19 citation statements)

References 51 publications

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“…9a. These values are in agreement with the binding energies of Zn 2+ ion previously reported 32,33 . The shift in the binding energy of Zn to higher values in kaolin/ZnO relative to Zn in ZnO alone further suggest substitutional effects of Si or Al in kaolin with oxygen in ZnO, thereby creating surface defect and oxygen vacancies.…”

Section: Resultssupporting

confidence: 93%

The role of kaolin and kaolin/ZnO nanoadsorbents in adsorption studies for tannery wastewater treatment

Mustapha

Tijani

Ndamitso

et al. 2020

Sci Rep

116

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In the present study, comparative studies of kaolin and kaolin/ZnO nanocomposites for the adsorption of Cr(VI), Fe(III), COD, BOD, and chloride from tannery wastewater were investigated. ZnO nanoparticles and kaolin/ZnO nanocomposites were prepared by sol-gel followed by wetimpregnation methods. The prepared adsorbents were characterized using different analytical tools such as X-ray diffraction, Fourier transforms infrared, high-resolution transmission electron microscopy, energy dispersive spectroscopy, selective area electron diffraction and Brunauer Emmett-Teller (BET) and X-ray Photoelectron Spectroscopy (XPS). The HRSEM/EDS/XPS analysis confirmed successful immobilization of clay structural network on the lattice layers of zincite hexagonal structure of ZnO nanoparticles. BET measurement showed an increase in the surface area of kaolin/ ZnO nanocomposites (31.8 m 2 /g) when compared to kaolin (17 m 2 /g). Batch adsorption studies were carried out by varying the parameters such as contact time, adsorbent dosage and temperature. The maximum removal of Cr(VI) (100%), Fe(III) (98%), COD (95%), BOD (94%) and Chloride (78%) was obtained at 15 min by kaolin/ZnO composites. While 78% Cr(VI), 91% Fe(III), 91% COD, 89% BOD and 73% Chloride were removed by kaolin under the same conditions. The kaolin/ZnO nanocomposites exhibited better adsorption performance than kaolin due to higher surface area of the former than the latter. It was found that the Jovanovic isotherm model fitted the adsorption experimental data most with the highest correlation (R 2 > 0.99) for both nanoadsorbents and indicate the occurrence of adsorption on monolayer and heterogeneous surfaces. The mechanism for the adsorption of metal ions in tannery wastewater onto the nano-adsorbents was examined using Weber Morris intra-particle diffusion model and Boyd plot which showed that the adsorption process was both intra-particle and film diffusion controlled. The thermodynamic parameters such as enthalpy change showed that that adsorption of metal ions and other parameters was feasible, spontaneous and endothermic. The ZnO/ clay nanocomposites exhibited excellent recyclable and re-useable properties even after six repeated applications and can, therefore, be applied in wastewater treatment for removal of heavy metals and other physicochemical parameters. Environmental contamination via natural and anthropogenic activities have been recognized as one of the major global problems confronting the human race and aquatic species. Industrial manufacturing processes utilize a high amount of clean water during operations and at the same time generate and discharge a large volume of untreated wastewater into water bodies. Specifically, industrial tanning process which transforms animal hides and skins into leather generate highly turbid, coloured and foul-smelling wastewater containing different organic

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Section: Resultssupporting

confidence: 93%

The role of kaolin and kaolin/ZnO nanoadsorbents in adsorption studies for tannery wastewater treatment

Mustapha

Tijani

Ndamitso

et al. 2020

Sci Rep

116

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“…Among a number of techniques for the preparation of ZnO QDs (such as laser-induced fragmentation in liquid, 54 radio-frequency (RF) atmospheric pressure plasmas (APPs) 55 ) the sol–gel method is the most popular as it is relatively more efficient, simple, and inexpensive. This method was first adopted by Bahnemann 56 for the preparation of ZnO QDs in the year 1987.…”

Section: Synthetic Approachmentioning

confidence: 99%

“…This process was largely scalable, ligand-free, and produces high quantum yield QDs. Recently Gunisha Jain 55 has developed a method for the production of highly ligand-free, defect-free, hydroxyl-terminated ZnO QDs using radio frequency atmospheric pressure micro plasma. The particle size was also nearly 1.9 nm.…”

Section: Synthetic Approachmentioning

confidence: 99%

Journey of ZnO quantum dots from undoped to rare-earth and transition metal-doped and their applications

Singh

2021

RSC Adv.

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“…TEM image of ZnO-NTP showed uniform grain morphology with a log normal size distribution and mean particle diameter of 19 nm, however there were also many particles at around 10 nm and 30 nm. The same plasma system was also capable of synthesizing smaller ZnO quantum dots with a mean particle diameter of 1.9 nm when operating under the same power conditions but using argon instead of helium [7]. This suggests that it is possible to control the size of the nanoparticle synthesized using non-thermal plasma by varying the feed gas composition.…”

Section: Discussionmentioning

confidence: 90%

“…NTP can be described as a green synthesis technique, in that no toxic chemicals are required in the generation of ZnO NP. There are a number of examples where NTP have been used to synthesize ZnO NP [4][5][6][7]. However, their interaction with complex liquids of biological relevance remains yet to be fully explored.…”

Section: Introductionmentioning

confidence: 99%

Plasma-synthesised Zinc oxide nanoparticle behavior in liquids

Rutherford

Jíra

Kolářová

et al. 2021

NANOCON 2021 Conference Proeedings

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Zinc oxide nanoparticles have been synthesized using non-thermal atmospheric pressure plasma (ZnO-NTP). We investigated the behavior of these ligand-free as a colloid suspension using different solvents, from deionized water to physiological saline and microbial culture broth. We found that the zeta potential of ZnO-NTP became more negative after exposure to microbial culture broth relative to water, which suggests increased colloid stability. Photoluminescence spectra of ZnO-NTP were similar regardless of liquid type, yet optical and fluorescent images of samples showed different agglomeration behavior depending on liquid type. Scanning electron microscopy images revealed large agglomerates of ZnO-NTP interacting with the surface of bacteria cells, ranging in size from 200 nm up to 2 µm. We also studied effect of sub-lethal concentrations of ZnO-NTP on bacteria under illumination. There was no significant difference in viable bacteria concentration after 24h exposure to 10 µg/mL ZnO-NTP relative to untreated control irrespective of sample illumination.

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One-step synthesis of strongly confined, defect-free and hydroxy-terminated ZnO quantum dots

Cited by 25 publications

References 51 publications

The role of kaolin and kaolin/ZnO nanoadsorbents in adsorption studies for tannery wastewater treatment

The role of kaolin and kaolin/ZnO nanoadsorbents in adsorption studies for tannery wastewater treatment

Journey of ZnO quantum dots from undoped to rare-earth and transition metal-doped and their applications

Plasma-synthesised Zinc oxide nanoparticle behavior in liquids

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