Naslov
State-of-the-art and current challenges for TiO2/UV-LED photocatalytic degradation of emerging organic micropollutants

Autori
Bertagna Silva, Danilo ; Buttiglieri, Gianluigi ; Babić, Sandra

Izvornik
Environmental science and pollution research (0944-1344) 28 (2021), 1; 103-120

Vrsta, podvrsta i kategorija rada
Radovi u časopisima, članak, znanstveni

Ključne riječi
ultraviolet light-emitting diode ; photocatalysis ; photoreactor design ; organic micropollutant ; water treatment ; titanium dioxide

Sažetak
The development of ultraviolet light-emitting diodes (UV-LED) opens new possibilities for water treatment and photoreactor design. TiO2 photocatalysis, a technology that has been continuously drawing attention, can potentially benefit from LEDs to become a sustainable alternative for the abatement of organic micropollutants (OMPs). Recently reported data on photocatalytic degradation of OMPs and their parameters of influence are here critically evaluated. The literature on OMP degradation in real water matrices, and at environmentally relevant concentrations, is largely missing, as well as the investigations of the impact of photoreactor design in pollutant degradation kinetics. The key factors for reducing UV-LED treatment technology costs are pointed out, like the increase in external quantumand wall- plug efficiencies ofUV-LEDs compared to other technologies, as well as the need for an appropriate design optimizing light homogeneity in the reactor. Controlled periodic illumination, wavelength coupling and H2O2 addition are presented as efficiency enhancement options. Although electrical energy per order (EEO) values for UV-LED photocatalysis have decreased to the range of traditionalmercury lamps, values are still not low enough for practical employment.Moreover, due to the adoption of high initial OMP concentration inmost experiments, it is likely thatmost literature EEO values are overestimated. Given the process characteristics, which are favoured by translucent matrices and small diameters for more homogenous light distribution and better transportation of radicals, innovative reactor designs should explore the potential of point- of-use applications to increase photocatalysis applicability at large scale.

Izvorni jezik
Engleski

Znanstvena područja
Interdisciplinarne tehničke znanosti

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