Combined X-ray absorption and SEM–EDX spectroscopic analysis for the speciation of thorium in soil

Ratnayake, Sanduni; Lützenkirchen, Johannes; Finck, N.; Schild, Dieter; Heberling, Frank; Gil-Díaz, Teba; Dardenne, Kathy; Rothe, Jörg; Geckeis, H.

doi:10.1038/s41598-023-32718-x

Cited by 3 publications

(3 citation statements)

References 30 publications

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“…EDX detects the characteristic X-rays emitted by the sample and provides explanations based on the elemental composition of the nanoparticles. By measuring the energy and intensity of the X-rays, EDX can identify the elements present and estimate their relative abundances [187].…”

Section: Sem-edx Analysermentioning

confidence: 99%

“…TGA is a characterization technique employed to investigate the thermal properties of materials [187]. It entails subjecting a sample to measured temperature changes while determining its weight as a function of temperature or time.…”

Section: Thermogravimetric Analysismentioning

confidence: 99%

“…These events include dehydration, decomposition, oxidation, phase transitions, and volatilization. It can be used to determine important parameters such as the onset temperature of thermal events, the rate of weight change, the presence of multiple decomposition steps, and the residual mass of the sample after complete decomposition [187]. TGA is useful in various departments, including materials science, chemistry, polymers, pharmaceuticals, and environmental analysis [195].…”

Section: Thermogravimetric Analysismentioning

confidence: 99%

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Green Synthesis, Characterization and Application of Silver Nanoparticles Using Bioflocculant: A Review

Nkosi,

Basson,

Ntombela

et al. 2024

Bioengineering

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Nanotechnology has emerged as an effective means of removing contaminants from water. Traditional techniques for producing nanoparticles, such as physical methods (condensation and evaporation) and chemical methods (oxidation and reduction), have demonstrated high efficiency. However, these methods come with certain drawbacks, including the significant energy requirement and the use of costly and hazardous chemicals that may cause nanoparticles to adhere to surfaces. To address these limitations, researchers are actively developing alternative procedures that are cost-effective, environmentally safe, and user-friendly. One promising approach involves biological synthesis, which utilizes plants or microorganisms as reducing and capping agents. This review discusses various methods of nanoparticle synthesis, with a focus on biological synthesis using naturally occurring bioflocculants from microorganisms. Bioflocculants offer several advantages, including harmlessness, biodegradability, and minimal secondary pollution. Furthermore, the review covers the characterization of synthesized nanoparticles, their antimicrobial activity, and cytotoxicity. Additionally, it explores the utilization of these NPs in water purification and dye removal processes.

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Section: Sem-edx Analysermentioning

confidence: 99%

Section: Thermogravimetric Analysismentioning

confidence: 99%

Section: Thermogravimetric Analysismentioning

confidence: 99%

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Green Synthesis, Characterization and Application of Silver Nanoparticles Using Bioflocculant: A Review

Nkosi,

Basson,

Ntombela

et al. 2024

Bioengineering

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Macroscopic and microscopic analysis of the effects of moisture content and dry density on the strength of loess

Bao,

Wei

2024

Science Progress

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To clarify the impact of moisture content and dry density on the strength of loess, the remolded loess samples with different moisture content and dry density were prepared, and the influence of moisture content and dry density on loess strength was explored from the macro level by direct shear test without suction control. On this basis, the mechanism of the influence of moisture content and dry density on loess strength was explored from the micro level by nuclear magnetic resonance method. The research results indicate that: In the case of low water content, there are peak points in the stress–strain curve of remolded loess, exhibiting strain softening characteristics. In the case of high water content, there is no obvious peak in the stress–strain curve, exhibiting strain hardening characteristics. Moisture has a significant impact on the shear strength of remolded loess. As the moisture content of the soil sample increases, the cohesion decreases significantly, and the change in internal friction angle is not obvious. As the moisture content continues to increase, the free water content continues to increase. Free water will continuously soften the soil particle structure, reduce the bonding force between soil particles, and cause the cohesion to decrease with the increase of moisture content. The change in dry density also has a significant impact on the shear strength parameters of remolded loess. As the dry density of the soil sample increases, the cohesion increases. The smaller the dry density, the larger the pore ratio, and the looser the contact between soil particles, weakening the bonding effect. The larger the pore ratio, the more bound water is converted to free water, and the strong bonding force between the water film and soil particles disappears. Both of these microscopic factors can lead to a decrease in cohesion with a decrease in dry density.

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Microwave-assisted Synthesis and Characterization of Metal Oxide Nanoparticles for Biological and Electrochemical Applications

Santhanaraj,

Alagarsamy,

vedhi

2024

Preprint

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Detection and monitoring of toxic and exhaust gases are crucial for energy and environmental conservation. Low-power, inexpensive gas sensors are in high demand. Metal oxide gas sensors are gaining interest due to their high selectivity and sensitivity. This research work aims to synthesize and characterize metal oxides, specifically thorium(IV) oxide, iron(III) oxide, and FTMMO, which is a mixed metal oxide consisting of iron and thorium. The synthesis of nanoparticles is accomplished using the co-precipitation method with a microwave reaction system. The resulting nanoparticles are subsequently characterized utilizing various analytical techniques such as FT-IR, UV-VIS (DRS), FE-SEM, EDAX, AFM, and XRD analysis. The cubic geometry of ThO2 and the face-centered rhombohedral structure of α-Fe2O3 nanoparticles were verified by XRD analysis. In order to investigate the utilization of iron(III) oxide, thorium(IV) oxide and iron thorium mixed metal oxides (FTMMO) are used to recognizes of ammonia and sulfur dioxide with the help of electrochemical method in the basic medium. The binding behavior of metal oxides and ovalbumin were investigated using UV-visible adsorption and fluorescence spectral techniques. The binding constant (Kb), Stern-Volmer constant (Ksv), and fluorophore quenching rate constant (kq) were calculated with the help of spectral data. Using the disc diffusion technique, research has been carried out to investigate the exceptional antibacterial activities of prepared metal oxides and mixed metal oxides against the different bacterial strains.

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Combined X-ray absorption and SEM–EDX spectroscopic analysis for the speciation of thorium in soil

Cited by 3 publications

References 30 publications

Green Synthesis, Characterization and Application of Silver Nanoparticles Using Bioflocculant: A Review

Green Synthesis, Characterization and Application of Silver Nanoparticles Using Bioflocculant: A Review

Macroscopic and microscopic analysis of the effects of moisture content and dry density on the strength of loess

Microwave-assisted Synthesis and Characterization of Metal Oxide Nanoparticles for Biological and Electrochemical Applications

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