Rapid assessment of the photocatalytic activity in construction materials: Pros and cons of reductive inks and oxidative fluorescence probes versus standardized NOx testing

Urbanism and communities centralization enlarges atmospheric pollution that affects both human beings as well as their constructed buildings. Different scientific and technological studies are being conducted, both in academic and construction industry, aiming the development of new construction materials with properties that can decrease visual pollution of cities, reducing also the number of cleanings required. The present research work aims the study and the production of self-cleaning ceramic surfaces in an economical and viable way without changing aesthetical aspect of material substrates used. The use of TiO2 nanoparticles (TiO2-NNPs) represents an attractive way to generate self-cleaning surfaces, therefore promoting the degradation of pollutant agents and reducing cleaning maintenance costs. In order to impart self-cleaning properties to ceramic surfaces, TiO2-NNPs based layers were deposited on different ceramic material substrates using the dip-coating method. The Photocatalytic activity (degradation of pollutants adsorbed on the surface) of the TiO2-NNPs based layers was characterized via the decomposition rate of an aqueous solution of Methylene blue (MB) under UV light irradiation. Colourless layers were successfully produced onto gray and white ceramic substrates using this sol-gel technique, without changing their aesthetical appearance. It was observed that the best photocatalytic activity was exhibited by the most porous ceramic substrate (gray); nevertheless, all the TiO2-NNPs coated ceramic surfaces showed good photocatalytic efficiency.

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Destruction of buildings and use of materials from renovated urban territories

Vestnik MGSU ◽

10.22227/1997-0935.2020.2.271-293 ◽

2020 ◽

pp. 271-293 ◽

Cited By ~ 1

Author(s):

Sergey A. Kolodyazhny ◽

Sergei N. Zolotukhin ◽

Anatoly A. Abramenko ◽

Yekaterina A. Artemova

Keyword(s):

Construction Materials ◽

Actual Problem ◽

Environment Friendly ◽

Environmental Friendliness ◽

Urban Territories ◽

Theoretical Generalization ◽

Pros And Cons ◽

The Cost ◽

Building Demolition

Introduction. Reuse of construction materials, products, and structures from demolished buildings and installations is an actual problem. The solution to it will improve the ecological situation. The study is aims at the determination of the causes of urban area renovation and searches for the most efficient technologies of building demolition with the reuse of the generated materials, products, and structures. Materials and methods. The study used systematization, structural analysis, comparative analysis, a theoretical generalization of the data obtained in a detailed analysis of literary and statistical sources, field surveys of objects. When field examining, photography methods were used. Results. Existing technologies of the building demolition, construction waste recovery, and reuse of construction materials generated using innovative item-by-item demolition technologies were revealed and systematized. Causes and main trends of urban territory renovation were analyzed. The paper studied Russian and foreign technologies of the building and installation demolition. The pros and cons of various demolition types are shown in terms of their environmental friendliness and economic efficiency. Conclusions. The experience of constructing low-rise buildings and intrasettlement roads showed that the item-by-item disassembly of buildings using modern equipment and machinery with the subsequent reuse of construction materials, products, and structures is efficient, economical, and environment-friendly. It is proven that the reuse of construction materials, products, and structures results in a significant reduction in the cost of erected installations. The results of the study can be applied in low-rise construction around the world.

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Photocatalytic Activity for NO Degradation by Construction Materials: Parametric Study andMultivariable Correlations

Journal of Advanced Oxidation Technologies ◽

10.1515/jaots-2010-0311 ◽

2010 ◽

Vol 13 (3) ◽

Cited By ~ 4

Author(s):

N. Bengtsson ◽

M. Castellote

Keyword(s):

Photocatalytic Activity ◽

Parametric Study ◽

Active Material ◽

Construction Materials ◽

Test Methods ◽

Photocatalytic Process ◽

Experimental Conditions

AbstractVarious standards have been published in an effort to rationalize and unify the evaluation and quantification of photocatalytic activity. The experimental conditions stated in the published standards and test methods differ in many aspects that make it very difficult to compare different results. This paper focuses on the influence of the different parameters involved in the photocatalytic process. The photocatalytic active material consists of white mortar, surface coated by TiO

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A Rapid Method of Assessing the Photocatalytic Activity of ThinTiO2Films Using an Ink Based on the Redox Dye 2,6-Dichloroindophenol

International Journal of Photoenergy ◽

10.1155/2008/504945 ◽

2008 ◽

Vol 2008 ◽

pp. 1-6 ◽

Cited By ~ 3

Author(s):

Andrew Mills ◽

Mark McGrady ◽

Jishun Wang ◽

James Hepburn

Keyword(s):

Photocatalytic Activity ◽

Rapid Assessment ◽

Moderate Intensity ◽

Glycerol Content ◽

Uva Irradiation ◽

Highly Sensitive ◽

Uva Light ◽

Photocatalytic Films ◽

Kinetics Of ◽

Ink Formulation

An indicator ink based on the redox dye 2,6-dichloroindophenol (DCIP) is described, which allows the rapid assessment of the activity of thin, commercial photocatalytic films, such as Activ. The ink works via a photoreductive mechanism, DCIP being reduced to dihydro-DCIP within ca. 7.5 minutes exposure to UVA irradiation of moderate intensity (ca. 4.8 mWcm−2). The kinetics of photoreduction are found to be independent of the level of dye present in the ink formulation, but are highly sensitive to the level of glycerol. This latter observation may be associated with a solvatochromic effect, whereby the microenvironment in which the dye finds itself and, as a consequence, its reactivity is altered significantly by small changes in the glycerol content. The kinetics of photoreduction also appear linearly dependent on the UVA light intensity with an observed quantum efficiency of ca.1.8×10−3.

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Mixed Photocatalyst for Sustainable Concrete Construction

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.626.39 ◽

2012 ◽

Vol 626 ◽

pp. 39-43 ◽

Cited By ~ 1

Author(s):

Ranjit K. Nath ◽

M.F.M. Zain ◽

Abdul Amir Hassan Kadhum ◽

Rabiul Alam

Keyword(s):

Quality Of Life ◽

Photocatalytic Activity ◽

Material Science ◽

Construction Materials ◽

Sustainable Concrete ◽

Rc Structure ◽

Corrosion Problem ◽

Photocatalytic Material ◽

Acidic Compound

An innovative approach to the material science has demonstrated that photocatalytic activity may be conferred to cement-based construction materials, such as concrete, mortars, paints, etc. Photocatalyst is needed for a cleaner environment and a better quality of life that leads to thoughts of a more eco-compatable use of light. Addition of photocatalytic materials to the RC structure during its construction phase could reduce the corrosion problem of RC materials. This material hinders calcium oxide to form acidic compound. In this study, cement-based mixed photocatalytic material has been presented, which would adjustable with RC material for enhancing oxidization process and reducing corrosion problem.

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Novel Strategies in Artificial Organ Development: What Is the Future of Medicine?

Micromachines ◽

10.3390/mi11070646 ◽

2020 ◽

Vol 11 (7) ◽

pp. 646 ◽

Cited By ~ 1

Author(s):

Marta Klak ◽

Tomasz Bryniarski ◽

Patrycja Kowalska ◽

Magdalena Gomolka ◽

Grzegorz Tymicki ◽

...

Keyword(s):

Rapid Assessment ◽

Three Dimensional ◽

Drug Efficacy ◽

Artificial Organ ◽

3D Bioprinting ◽

Preclinical Research ◽

Interdisciplinary Field ◽

The Future ◽

Pros And Cons ◽

Basic Studies

The technology of tissue engineering is a rapidly evolving interdisciplinary field of science that elevates cell-based research from 2D cultures through organoids to whole bionic organs. 3D bioprinting and organ-on-a-chip approaches through generation of three-dimensional cultures at different scales, applied separately or combined, are widely used in basic studies, drug screening and regenerative medicine. They enable analyses of tissue-like conditions that yield much more reliable results than monolayer cell cultures. Annually, millions of animals worldwide are used for preclinical research. Therefore, the rapid assessment of drug efficacy and toxicity in the early stages of preclinical testing can significantly reduce the number of animals, bringing great ethical and financial benefits. In this review, we describe 3D bioprinting techniques and first examples of printed bionic organs. We also present the possibilities of microfluidic systems, based on the latest reports. We demonstrate the pros and cons of both technologies and indicate their use in the future of medicine.

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