Robust Hg0.023WO3 nanoparticles: Synthesis, characterization and application as relative humidity sensing material and photocatalyst for degradation of organic dye contamination

Renukadevi, R.; Sundaram, R.; Kaviyarasu, K.

doi:10.1016/j.matpr.2020.02.925

Cited by 3 publications

(3 citation statements)

References 32 publications

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“…As the humidity percentage level was raised, corresponding decrease in the values of resistance occurred [3,6,32,33].…”

Section: (F) Single Response / Recovery Time Curve Of Cao Nanoparticlesmentioning

confidence: 99%

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Synthesis, characterization and humidity sensing applications of calcium oxide nanoparticles synthesized by facile chemical precipitation method

Khan,

Din

2024

Preprint

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Calcium oxide nanoparticles were prepared by mixing aqueous calcium nitrate tetrahydrate solution with sodium hydroxide solution. After short time, a precipitate of white colour of calcium hydroxide was formed. This precipitate was then dried in an electric oven to form powder. The formed dried powder was then calcinated for 3 hours at about 600 oC by applying an electric furnace to form CaO nanoparticles. Characterization of the prepared nanomaterials was performed by applying various characterization methods. X-ray photoelectron spectroscopy (XPS) analysis was performed to study the surface chemical properties, UV-Visible spectroscopy was studied to examine the optical characteristics of the formed materials, thermogravimetric analysis (TGA) was done to study the thermal stability of the products and nitrogen adsorption-desorption was carried out to find out the porosity and surface area of the formed sample calcium oxide nanopartilcles. Humidity sensing performance was studied by measuring the variations in resistance of the sensor using LCR meter as a result of changes in humidity levels in a sealed chamber. From the results of XPS, it was proved that the sample mainly contains calcium and oxygen along with small amounts of impurities such as magnesium, sodium and chlorine. UV-Visible spectra showed two absorption bands at 230 nm and 267 nm. A broad absorption band was also found ranging from 300 nm to 350 nm. The band gap energy calculated from UV-Visible results was observed as 3.39 eV. TGA study confirmed that the weight loss occurred in two steps at two different temperatures. From nitrogen adsorption-desorption, BET surface area was calculated to be 129.49 m2/g and BJH surface area was observed to be 101.34. The average pore size estimated from BJH pore size distribution was 1.704 nm and the average pore volume was observed as 0.238 cc/g. The humidity sensing data showed a decrease in resistance of the sample with increase in the value of humidity, while sensitivity of the sample was increased linearly with increase in humidity levels. The response and recovery times of the sensor were 79 sec and 147 sec respectively. Humidity sensor stability evaluated for 90 days at 15 days intervals were noted and the results indicated that the formed sensor was 65 % stable for the above mentioned period. The results of the studied parameters concluded that the prepared calcium oxide nanoparticles can be effectively used for humidity sensing applications.

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“…As the humidity percentage level was raised, corresponding decrease in the values of resistance occurred [3,6,32,33].…”

Section: (F) Single Response / Recovery Time Curve Of Cao Nanoparticlesmentioning

confidence: 99%

“…By preparing nanospecies of metal oxides, they occupy a distinctive position due to their broad range of properties, which are used in numerous applications. Particularly, semiconductor metal oxide nanomaterials have attractive applications in photoelectron, sensors, catalyst, highly functional as well as effective devices [6].…”

Section: Introductionmentioning

confidence: 99%

Synthesis, characterization and humidity sensing applications of calcium oxide nanoparticles synthesized by facile chemical precipitation method

Khan,

Din

2024

Preprint

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“…At the same time, the desire to improve the functional efficiency of the materials obtained makes the researcher use, in the photocatalyst synthesis, substances based on heavy and toxic elements with high eco-risks to the habitat of animals and humans. Thus, for instance, well known are the works for creating high-efficiency photocatalysts to purify water from organic pollutants with use of compounds of thallium [10][11][12][13], mercury [14][15][16], lead [17][18][19], cadmium [20,21], uranium [22], and thorium [23]. The most promising solution to this problem is the application of the "green" synthesis method when receiving the compounds under study.…”

Section: Introductionmentioning

confidence: 99%

Study of the Composition and Properties of Bivalve Mollusk Shells as Promising Bio-Indifferent Materials for Photocatalytic Applications (Example of Practical Use)

Zaitsev,

Astapov

2023

Catalysts

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This paper studies the composition and properties of shells of bivalve mollusks (Crenomytilus grayanus, Callista brevisiphonata, and Mizuhopecten yessoensis) from coastal discharges with a view to the possibility of their use in photocatalytic water treatment systems. The clam shells are considered in terms of application in the form of a powder material as a precursor for creating photocatalysts, and also as a carrier of photocatalytic coatings. It was shown that the main phase composing the shell material was calcium carbonate in two crystallographic modifications—calcite and aragonite. The presence of inorganic impurities in all studied clam shells did not exceed one mass percent. The main share was made up of elements included in the composition of calcium carbonate, which confirmed the high bio-indifference of the materials under study. Depending on the physiological and environmental features of the structure of clam shells, different contents of the organic component in their composition were observed. The granulometric characteristics of crushed clam shells (average diameter, specific surface area, and distribution modality) were studied. It was shown that the maximum values of bending strength of 5 MPa and compressive strength of 2 MPa are characterized by Mizuhopecten yessoensis shells with the lowest porosity of 2.91%. The features of sorption and photosorption processes of both whole and crushed shells in relation to four organic dyes at different temperatures and degrees of illumination were studied. Based on crushed shells of Mizuhopecten Yessoensis and titanium dioxide, functional materials (CaxTiyOz) were obtained, and their morphology and photocatalytic properties were studied. An example of the practical use of clam shells as a carrier of a photocatalytic coating is given.

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Self-assembly of CdSe 3D urchins and their photocatalytic response

Venci

George

Raj

et al. 2022

Environmental Research

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Robust Hg0.023WO3 nanoparticles: Synthesis, characterization and application as relative humidity sensing material and photocatalyst for degradation of organic dye contamination

Cited by 3 publications

References 32 publications

Synthesis, characterization and humidity sensing applications of calcium oxide nanoparticles synthesized by facile chemical precipitation method

Synthesis, characterization and humidity sensing applications of calcium oxide nanoparticles synthesized by facile chemical precipitation method

Study of the Composition and Properties of Bivalve Mollusk Shells as Promising Bio-Indifferent Materials for Photocatalytic Applications (Example of Practical Use)

Self-assembly of CdSe 3D urchins and their photocatalytic response

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