Graphene-TiO2 hybrids for photocatalytic aided removal of VOCs and nitrogen oxides from outdoor environment
authors Tobaldi, DM; Dvoranova, D; Lajaunie, L; Rozman, N; Figueiredo, B; Seabra, MP; Skapin, AS; Calvino, JJ; Brezova, V; Labrincha, JA
nationality International
author keywords Air pollution; Volatile organic compounds; Nitrogen oxides; Graphene; Solar photochemical reaction
abstract Outdoor and indoor air pollution has become a global concern in modern society. Although many policies and regulations on air quality have been promulgated worldwide over the past decades, airborne pollution still negatively affects health and therefore the life-style of human beings. One of the strategies to challenge this problem might be reducing the amount of airborne pollutant by mineralising them via photoinduced reactions. Photocatalytic oxidation of gaseous pollutants via titanium dioxide is one of the most promising solar photochemical reactions. In this research work, by means of a green sol-gel procedure, we have coupled titania to graphene (0.5 and 1.0 wt%) aiming to increase the solar photocatalytic activity of the produced hybrid materials. Transient paramagnetic species formed upon UV-A irradiation were detected by means of EPR spectroscopy. The photocatalytic reactions were assessed by monitoring the removal of nitrogen oxides and two different volatile organic compounds (benzene and isopropanol), which has never been assessed before. Our results highlight the exceptional characteristics of the TiO2/graphene hybrid material synthesised with 1.0 wt% graphene, and its excellent suitability for multi-purpose applications in the field of environmental remediation. Compared to unmodified titania, it shows a clear enhancement in the photocatalytic removal of those hazardous pollutants, having a photocatalytic degradation rate twice higher. In addition, the same material is highly stable and shows fully recyclability over repeated tests. Hybrid titania-graphene materials could thus be exploited to grant safer outdoor and indoor environments, having thus a beneficial impact on public health and on the quality of our lives.
issn 1385-8947
isbn 1873-3212
year published 2021
volume 405
digital object identifier (doi) 10.1016/j.cej.2020.126651
web of science category 14
subject category Engineering, Environmental; Engineering, Chemical
unique article identifier WOS:000623318700001
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journal analysis (jcr 2019):
journal impact factor 10.652
5 year journal impact factor 9.43
category normalized journal impact factor percentile 97.361
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