Search results

1

Sorption of the anionic reactive red RB dye in cellulose: Assessment of kinetic, thermodynamic, and equilibrium data

100%

Silva L. S., Lima L. C. B., Ferreira F. J. L., Silva M. S., Osajima J. A., Bezerra R. D. S., Filho E. C. S.

Open Chemistry

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2015

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vol. 13

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issue 1

EN

The cellulose matrix was characterized by FTIR, 13C NMR, XRD, TG, SEM and applied in the removal of the reactive red RB dye in an aqueous medium, with a capacity of adsorption at a pH of 2.0, and an adsorption equilibrium time which was reached at around 200 mins. The kinetic study for the system followed the Elovich model. The adsorption isotherms for the system at temperatures of 35°C, 45°C, and 55°C were adjusted to the Langmuir, Freundlich, Sips, and Redlich-Peterson non-linear models, with a capacity of adsorption for adsorbent of 5.97 mg g-1, 5.64 mg g-1, and 4.62 mg g-1, respectively. The adsorption occurred by electrostatic interactions and it was favorable and spontaneous, with the influence of temperature.

2

Purification and characterization of a novel laccase from the mushroom Pleurotus nebrodensis

100%

Tian G.-T., Zhang G.-Q., Wang H.-X., Ng T. B.

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2012

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vol. 59

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issue 3

407-412

EN

A novel laccase with a molecular mass of 64 kDa and the N-terminal sequence AIGPDDTINF was isolated from fresh fruiting bodies of the mushroom Pleurotus nebrodensis. The purification protocol comprised ion exchange chromatography on DEAE-cellulose, CM-cellulose, and Q-Sepharose, and gel filtration on Superdex 75. The laccase was adsorbed on DEAE-cellulose and Q-Sepharose, but not on CM-cellulose. It demonstrated an optimal temperature of 70°C. The enzyme activity increased steadily over the temperature range 20°C-70°C. There was only a slight reduction in activity at 80°C. However, all activity disappeared following exposure to 100°C for 10 minutes. The enzyme activity changed only slightly over the pH range 3-5, with the optimum at pH 5, but underwent a precipitous decline when the pH was elevated to 6, and was undetectable at pH 8 and pH 9.

3

Economically viable synthesis of Fe3O4nanoparticles and their characterization

88%

Srivastava V., Singh P., Weng C., Sharma Y.

Polish Journal of Chemical Technology

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2011

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vol. 13

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issue 2

1-5

EN

Nano iron oxide particles (Fe3O4) were synthesized by coprecipitation of Fe2+ and Fe3+ by ammonia solution in the aqueous phase. Various instrumentation methods such as X ray Diffractometry (XRD), Transmission Electron Microscopy (TEM), Fourier Transform Infrared (FTIR) spectroscopy, Brunauer-Emmett-Teller (BET) and Vibrating Sample Magnetometery (VSM) were used to characterize the properties of nanoparticles. The size of the nanoparticles was measured and was found to be between 10 to 15 nm. The value of saturation magnetization of the nanoparticles was found to be 55.26 emu/g. The BET surface area of nano iron oxide particles measured to be 86.55 m2/g.

4

Evaluation and characterization of lithium grease from Palm kernel oil for automobiles and industrial machinery

88%

Amanambu V. O., Nwadinigwe C. A.

World News of Natural Sciences

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2024

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vol. 53

120-129

EN

Grease is made up of a lubricant (typically petroleum oil) and a thickener (soap). The study focus on the production and characterization of grease for automobile and industrial machinery. The practicality and application of the technique were examined in order to decide whether the lithium grease produced from palm kernel oil might be used as an environmental friendly alternative to conventional grease. The aforementioned objective was achieved by mechanically extracting oil from palm kernel nuts. Lithium grease was produced through the saponification of lithium oxide with palm kernel oil. The lithium grease melting and drop points, flash point, and ash content were discussed. According to the study's findings, the lithium grease produced results that were acceptable and in accordance with ASTM standards, with the exception of its ash content, which will cause the grease to break off under pressure.

5

Characterization of a static expansion standard for calibrating medium and high vacuum pressure gauges

88%

Duarte Franco J. J., Villamizar Mora C. M., García Sánchez C. E., Duarte Franco J. J., Villamizar Mora C. M., García Sánchez C. E.

Metrology and Measurement Systems

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2021

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vol. 28

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issue 3

6

Synthesis, Spectroscopic Interpretations, and Antioxidant Efficiency of Two Vital Selenium Complexes

75%

Al-Khodir F.

Acta Physica Polonica A

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2017

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vol. 132

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issue 4

1265-1271

EN

This paper aimed to synthesis, spectroscopic characterizations, and antioxidant assessment of two new selenium complexes with nicotinamide (Nic) and riboflavin (RF) as drug chelates. The speculated structures of the synthetic selenium complexes have been discussed by using different tools of spectroscopic analyses like infrared, the Raman, electronic, ¹H-NMR, and mass. Accordingly, the Fourier transform infrared and ¹H-NMR spectra, the mode of complexation is supported, as four molecules of nicotinamide drug act as a monodentate chelate through the N-atom of the pyridine ring with [Se(Nic)₄]·H₂O formula. The two riboflavin drug molecules coordinated to selenium metal as a bidentate chelate through azomethine nitrogen of pyrazine ring and O-atom of C=O pyrimidine-2,4-dione group with general formula [Se(RF)₂]. Both of Nic and RF chelates act as neutral charge ligands. The conductivity measurements indicated that the selenium complexes are non-electrolytes behaviors. Thermal analyses (thermal gravimetric-differential thermal analysis) of the studied complexes show that the decomposition process takes place in one broadening step with a wide temperature range. The surface morphology of the mentioned complexes was studied by scanning electron microscope and the particle size is calculated using X-ray powder diffraction. Thermodynamic kinetic parameters are calculated by using the Coats and Redfern equation. Screening of antioxidant activities of selenium complexes in vitro are assessed. The antioxidant activity is studied by three methods (DPPH assay, β-carotene/linoleic acid bleaching assay, and ferric reducing power assay), the studied complexes have a significant antioxidant activity compared to synthetic antioxidants like trolox and BHT.

7

A Review on Strontium Oxide Nanoparticles

75%

Senthilkumar V., Nisha S., Saravanan M.

World News of Natural Sciences

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2023

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vol. 50

147-158

EN

This review article provides a comprehensive overview of the synthesis, characterization, and potential applications of strontium oxide nanoparticles (SrONPs). The focus is on discussing the stability of SrONPs, including their resistance to degradation and corrosion in harsh chemical environments. The review highlights their robust thermal and electrical resistivity, making them suitable for high-temperature applications and maintaining reliable performance in electrical systems. Various characterization techniques, such as UV-Visible spectrometry, FTIR spectroscopy, SEM, XRD, and dynamic light scattering, are utilized to analyze the properties of SrONPs. Additionally, the review explores their potential applications, including their antibacterial properties and suitability for diverse fields such as electronics, energy storage, lighting, and wastewater treatment. This review provides a comprehensive understanding of SrONPs, emphasizing their stability, versatility, and potential for wide-ranging industrial and biomedical applications.

8

Use of high-density paste bacfill for safe disposal of copper/zinc mine tailings

75%

Yilmaz E., Belem T., Benzaazoua M., Kesimal A., Ercikdi B., Cihangir F., Yilmaz E., Belem T., Benzaazoua M., Kesimal A., Ercikdi B., Cihangir F.

Gospodarka Surowcami Mineralnymi

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2011

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issue 3

Refine search results

Sorption of the anionic reactive red RB dye in cellulose: Assessment of kinetic, thermodynamic, and equilibrium data

Purification and characterization of a novel laccase from the mushroom Pleurotus nebrodensis

Economically viable synthesis of Fe3O4nanoparticles and their characterization

Evaluation and characterization of lithium grease from Palm kernel oil for automobiles and industrial machinery

Characterization of a static expansion standard for calibrating medium and high vacuum pressure gauges

Synthesis, Spectroscopic Interpretations, and Antioxidant Efficiency of Two Vital Selenium Complexes

A Review on Strontium Oxide Nanoparticles

Use of high-density paste bacfill for safe disposal of copper/zinc mine tailings