Iris Publishers_Journal of Textile Science & Fashion Technology

Application of Luminous Textile Coated by TiO2 For Photocatalytic Removal of Acetic Acid, Formaldehyde and Toluene from Indoor Air

Abstract

 Luminous textile coated by silica and TiO2 is studied for indoor air treatment. The textile aging induced by UV exposure in the presence of TiO2 coating was studied, showing a good durability of the textile after protection by Silica layer unlike silica‐free textile. Interesting photocatalytic activity was achieved for the photocatalytic luminous textile to remove three different VOCs in air which are acetic acid (AA), formaldehyde and toluene. The effect of number of photons and residence time was carefully highlighted for both TiO2 P25 in powder or supported in the luminous textile. Then, a comparative study, between the classic system composed of TiO2 powder and the innovative system integrating photocatalyst and light, was described. The advantage of the photocatalytic luminous textile is their performance associated to an important energy gain due to the use of one UV‐LED to homogeneously irradiate an important surface of textile allowing the development of compact photocatalytic device.

Introduction

Air pollution from indoor environments is becoming increasingly a public health concern. The permanent presence of chemical pollutants causes various respiratory and chronic diseases [1]. From these various pollutants, there are volatile organic compounds (VOCs) and carboxylic acids which are present in air in different concentrations as a result of biogenic emissions, anthropogenic emissions, materials and lacquer coating [2‐5]. Thus, their removal from air is a major challenge to prevent human health issues.
Photocatalysis is a very promising technology for air treatment. The main advantage of this process is not just the remove of VOCs but also their mineralization at room temperature and atmospheric pressure due to generation of reactive oxygen species, OH•, O2• − and HO2 • from air and humidity. It occurs by activating a photocatalyst using a certain wavelength of UV light. A large range of semi‐conductors is available to induce photocatalysis, while TiO2 is seen as one of the most promising photocatalysts for practical applications. This material is cheap, abundantly available and chemically stable.

The first step in a photocatalytic reaction is when photons with sufficient energy are absorbed by the photocatalyst, generating an electron and a hole (e‐ and h+). These electrons and holes can induce redox reactions, often via the formation of radicals as shown in equations 1 and 2. These radical species allow oxidation of organic compounds.


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