Developing scenario of titania-based building materials for environmental remediation
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REVIEW
Developing scenario of titania‑based building materials for environmental remediation S. Ghosh1 · R. Patra1 · D. Majumdar2 · K. Sen1 Received: 21 November 2019 / Revised: 10 August 2020 / Accepted: 21 September 2020 © Islamic Azad University (IAU) 2020
Abstract The present review article is aimed at analysing the different aspects of titania-modified building materials towards environmental remediation. The possibility of degradation of different toxic environmental pollutants like VOCs and NOx by the titania-modified paints, cements and other building materials has been discussed. The major role of titania resides in its photocatalytic activity that renders the materials’ potent for degrading these obnoxious compounds. The application of TiO2 both in small and in large scale and the mutual relationship of the amount of TiO2 with the amount of main building block constituents are discussed in detail. Application of daylight or lamplight, energy, time, and atmospheric conditions has also been dealt with. This review article solely focuses on titania-incorporated building blocks and is an endeavour to propagate a new horizon for our future pollution-free perspectives. Several environmental and product-related parameters that affect the efficacy of these modified matrices have been taken up. The present scenario in the industrial fields has also been assessed. Finally, a critical view is also presented that highlights the shortfall and areas open for further research and development in this particular field. Keywords Titanium oxide · Photocatalytic activity · Depolluting activity · Self-cleaning · VOCs · NOx
Introduction With the discovery of photochemical decomposition of water in the presence of n-type TiO2 semiconductor under photon irradiation (Fujishima and Honda 1972), it has become a subject of intense research to study its photocatalytic oxidation (PCO) property. T iO2 is therefore gaining importance as a photocatalyst in exploring various applications in air purification, self-cleaning, etc. Air pollution is a serious concern to the modern world mainly due to anthropological Editorial responsibility: Fatih ŞEN. Electronic supplementary material The online version of this article (https://doi.org/10.1007/s13762-020-02952-1) contains supplementary material, which is available to authorized users. * K. Sen [email protected] 1
Department of Chemistry, University of Calcutta, 92 APC Road, Kolkata 700009, India
National Environmental Engineering Research Institute, Kolkata Zonal Laboratory, I‑8, Sector C, EKDP, E. M. Bypass, Kolkata 700108, India
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reasons. Volatile organic compounds (VOCs) and nitrogen oxides (NOx) are the most common pollutants prevailing in the air. There are some conventional methods of air purification, such as employing filters to remove particulate matter or use of adsorbing materials (viz. activated charcoal) in order to adsorb pollutant molecules (Yu et al. 2007). But these techniques do not offer any permanent solution. Therefore, a sustainable and env
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