Determination of organogenic elements in the composition of functional compounds and materials

Fadeeva, V. P.; Тихова, В. Д.; Deryabina, Yu. M.; Nikulicheva, O. N.

doi:10.1134/s0022476614050278

Cited by 5 publications

(2 citation statements)

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“…11,12 Moreover, this material acts as a bifunctional catalyst in the chemical fixation of carbon dioxide (CO 2 ) to produce α-alkylidene cyclic carbonates, α-alkylidene cyclic carbamates, and β-oxopropylcarbamates 13 and as a single-component bifunctional catalyst for the carboxylation of terminal alkynes with CO 2 under ambient conditions, 14 exhibits electrocatalytic activity for the reduction of p-nitrophenol, K 2 CrO 4 , and H 2 O 2 in basic solution 15 as well as for the detection of catechol, 16 and has the ability to absorb halogen-and sulfur-containing products. 17 Ag 2 WO 4 crystals can have three crystal structure types. These three polymorphs are assigned as alpha (α) for the orthorhombic structure with space group Pn2n, beta (β) for the hexagonal structure with space group P6 3 /m, and gamma (γ) for the cubic structure with space group Fd3 ¯m.…”

Section: Introductionmentioning

confidence: 99%

Facet-dependent photocatalytic and antibacterial properties of α-Ag₂WO₄crystals: combining experimental data and theoretical insights

Roca

Sczancoski

Nogueira

et al. 2015

Catal. Sci. Technol.

127

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In this paper, we have combined the various experimental results and first-principles calculations with a new and interesting discussion to explain the photocatalytic and antibacterial activities of α-Ag 2 WO 4 crystals, which were obtained using the microwave-hydrothermal (MH) method with anionic surfactants. The advantages of the insights gained through the present work are two-fold. First, the mechanism and origin of the photocatalytic and antibacterial activities can be rationalized. Second, this facile and controllable synthetic method is expected to encourage the synthesis of complex metal oxides with specific active facets, and these insights can contribute to the rational design of new materials for multifunctional applications. X-ray diffraction and Rietveld refinement analysis confirmed that all the crystals have an orthorhombic structure without deleterious phases. Ultraviolet-visible diffuse reflectance spectroscopy indicated the presence of intermediary energy levels and a variation in the optical band gap values (3.09-3.14 eV) with the crystal growth process.The geometry, electronic properties of the bulk, and surface energies of these crystals were evaluated using first-principles quantum mechanical calculations based on the density functional theory. The crystal shapes was experimentally and theoretically modeled based on Rietveld refinement data, emission scanning electron microscopy images, and Wulff construction. To obtain a wide variety of crystal shapes, the morphologies were gradually varied by tuning the surface chemistry, i.e., the relative stability of the faceted crystals. The growth mechanisms of different α-Ag 2 WO 4 crystals and their facet-dependent photocatalytic and antibacterial performances were explored in details. The combination of experimental and theoretical data revealed the presence of (110) and (011) planes with high surface energies together with the disappearance of faces related to the Ĳ010)/Ĳ010) planes in α-Ag 2 WO 4 crystals are key factors that can rationalize both the photocatalytic and antibacterial activities. The different activities may be attributed to the different number of unsaturated superficial Ag and W atoms capable of forming the main active adsorption sites. Finally, we discuss how knowledge of surface-specific properties can be utilized to design a number of crystal morphologies that may offer improved performance in various applications.

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Section: Introductionmentioning

confidence: 99%

Facet-dependent photocatalytic and antibacterial properties of α-Ag₂WO₄crystals: combining experimental data and theoretical insights

Roca

Sczancoski

Nogueira

et al. 2015

Catal. Sci. Technol.

127

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“…Determination of the content of organogenic elements (C, H, N, O, S) was carried out according to a well-known technique [29]. Carbon, hydrogen, and nitrogen were determined simultaneously from a single sample using a CHN analyzer.…”

Section: Methodsmentioning

confidence: 99%

Extraction and Characterization of Humic Acid Based on Coal Mining Waste

Nazarbek

Raiymbekov

2022

Chem Eng & Technol

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Humic acid obtained from coal mining waste from the Lenger deposit was studied. Potassium humates were extracted from the raw material using potassium hydroxide. Hydrochloric acid at various concentrations was used for acid sedimentation of humic acids. Experimental data were obtained describing the effect of the HCl concentration and the sedimentation time on the organogenic composition of humic acid and on its acidic characteristics. Organogenic elements, carboxyl groups, and acid values were determined. Fourier transform infrared spectrometry with absorption bands in the range of 4000–600 cm−1, scanning electron microscopy, energy‐dispersive X‐ray spectroscopy, and X‐ray diffraction analysis were used to characterize the feedstock and the obtained products.

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Ag2WO4 as a multifunctional material: Fundamentals and progress of an extraordinarily versatile semiconductor

Gouveia

Roca

Macedo

et al. 2022

Journal of Materials Research and Technology

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Determination of organogenic elements in the composition of functional compounds and materials

Cited by 5 publications

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Facet-dependent photocatalytic and antibacterial properties of α-Ag₂WO₄crystals: combining experimental data and theoretical insights

Facet-dependent photocatalytic and antibacterial properties of α-Ag₂WO₄crystals: combining experimental data and theoretical insights

Extraction and Characterization of Humic Acid Based on Coal Mining Waste

Ag2WO4 as a multifunctional material: Fundamentals and progress of an extraordinarily versatile semiconductor

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Determination of organogenic elements in the composition of functional compounds and materials

Cited by 5 publications

References 0 publications

Facet-dependent photocatalytic and antibacterial properties of α-Ag2WO4crystals: combining experimental data and theoretical insights

Facet-dependent photocatalytic and antibacterial properties of α-Ag2WO4crystals: combining experimental data and theoretical insights

Extraction and Characterization of Humic Acid Based on Coal Mining Waste

Ag2WO4 as a multifunctional material: Fundamentals and progress of an extraordinarily versatile semiconductor

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Product

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Facet-dependent photocatalytic and antibacterial properties of α-Ag₂WO₄crystals: combining experimental data and theoretical insights

Facet-dependent photocatalytic and antibacterial properties of α-Ag₂WO₄crystals: combining experimental data and theoretical insights