Comparative activity evaluation for silica raw materials and photocatalytic composite materials based on them

Gubareva, Ekaterina; Ogurtsova, Yulia N.; Строкова, В.; Labuzova, M V

doi:10.17580/or.2019.06.05

Cited by 9 publications

(3 citation statements)

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“…This is how smart composites work. Given the theoretical principles of geomimetics, the great diversity of acoustic, heat-insulating, and structural-heat-insulating composites based on foam glass have been developed [56,57].…”

Section: The Technogenic Metasomatismmentioning

confidence: 99%

Self-Healing Construction Materials: The Geomimetic Approach

et al. 2021

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A person spends most of his life in rooms built from various building materials; therefore, the optimization of the human environment is an important and complex task that requires interdisciplinary approaches. Within the framework of the new theory of geomimetics in the building science of materials, the concepts of technogenic metasomatism, the affinity of microstructures, and the possibilities of creating composites that respond to operational loads and can self-heal defects have been created. The article aims to introduce the basic principles of the science of geomimetics in terms of the design and synthesis of building materials. The study’s novelty lies in the concept of technogenic metasomatism and the affinity of microstructures developed by the authors. Novel technologies have been proposed to produce a wide range of composite binders (including waterproof and frost-resistant gypsum binders) using novel forms of source materials with high free internal energy. The affinity microstructures for anisotropic materials have been formulated, which involves the design of multilayered composites and the repair of compounds at three levels (nano-, micro-, macro-). The proposed theory of technogenic metasomatism in the building science of materials represents an evolutionary stage for composites that are categorized by their adaptation to evolving circumstances in the operation of buildings and structures. Materials for three-dimensional additive technologies in construction are proposed, and examples of these can be found in nature. Different ways of applying our concept for the design of building materials in future works are proposed.

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Section: The Technogenic Metasomatismmentioning

confidence: 99%

Self-Healing Construction Materials: The Geomimetic Approach

et al. 2021

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“…The morphology of the synthesized particles, their size and content and polymorphic modification of the final product can be controlled and regulated at all stages of the synthesis. Additionally, the advantages of the sol–gel technology are low temperatures of processes and homogeneity at the molecular level, which make it possible to obtain materials with desired properties, which is important for the PCM of the SiO 2 –TiO 2 system [ 17 , 18 , 19 , 20 ].…”

Section: Introductionmentioning

confidence: 99%

Obtaining and Properties of a Photocatalytic Composite Material of the “SiO2–TiO2” System Based on Various Types of Silica Raw Materials

et al. 2021

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Compositions and technology for obtaining a photocatalytic composite material (PCM) by deposition of titanium dioxide particles synthesized by the sol–gel method on a silica support of various types (microsilica, gaize and diatomite) have been developed. The properties (chemical and mineral composition, dispersion, specific surface area, porosity, ζ-potential, acid–base properties, and microstructure) of microsilica, gaize and diatomite were studied to assess the effectiveness of using a photocatalytic agent as a carrier. In terms of specific viscosity (ηsp = 45), the concentration of the precursor (tetrabutoxytitanium—TBT) is set at 22 vol. % in a solvent (ethanol), at which it is possible to obtain the maximum amount of dissolved film oligomer without the formation of an aggregate-like precipitate. Modification of the reaction mixture (precursor: ethanol = 1:3) by replacing part of the solvent with a Span-60 surfactant/TBT = 1–1.1 made it possible to obtain polydisperse titanium dioxide particles with peak sizes of 43 nm and 690 nm according to laser granulometry data. Taking into account the interaction of titanium complexes with the surface of a silica support, a phenomenological model of the processes of structure formation of a photocatalytic composite material is proposed. By the value of the decomposition of rhodamine B, the photocatalytic activity of the developed composite materials was determined: PCM based on diatomite—86%; PCM based on microsilica—85%; PCM based on gaize—57%.

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“…The team of authors studied the efficiency of titanium application on silica raw materials in order to obtain a photocatalytic composite material (PCM) [15]. At the same time, the possibility of the use of both natural and technogenic raw materials was substantiated as a silica substrate.…”

Section: Introductionmentioning

confidence: 99%

Specifics of Structure Formation of Cement Stone with Silica Raw Material - A Substrate of Photocatalytic Composite Material

NELYUBOVA

Ogurtsova

Sivalneva

et al. 2021

MSF

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The increasing urbanization of urban areas poses the challenge of the development of materials capable of self-cleaning from organic pollutants formed. Previous papers substantiated the possibility of the coating of titanium oxide as the main agent of the photocatalytic method of cleaning structural materials on silica raw materials in order to increase the degree of its distribution in the volume of cement matrix and, as a result, increase its efficiency.It is obvious that a silica substrate will affect the processes of structure formation during hardening of a cement matrix. During the research, the processes of phase transformations of cement stone modified with silica raw materials of natural and technogenic origin were studied. As a result, the influence of siliceous modifiers on the strength characteristics of the cement stone was determined, which allowed ranking them according to the degree of decrease in efficiency as follows: technogenic raw materials; natural raw materials of silicate composition; natural raw materials of aluminosilicate composition. Quantitative assessments of the degree of efficiency showed the irrationality of using aluminosilicate composition as a silica modifier of natural raw materials, which is explained by its low pozzolanic activity.

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Comparative activity evaluation for silica raw materials and photocatalytic composite materials based on them

Cited by 9 publications

References 0 publications

Self-Healing Construction Materials: The Geomimetic Approach

Self-Healing Construction Materials: The Geomimetic Approach

Obtaining and Properties of a Photocatalytic Composite Material of the “SiO2–TiO2” System Based on Various Types of Silica Raw Materials

Specifics of Structure Formation of Cement Stone with Silica Raw Material - A Substrate of Photocatalytic Composite Material

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