Continuous photocatalytic, electrocatalytic and photo-electrocatalytic degradation of a reactive textile dye for wastewater-treatment processes: Batch, microreactor and scaled-up operation

The study of photocatalytic degradation of a commercial azo reactive dye in a simple design reusable miniaturized reactor with interchangeable TiO 2 nanofilm

“…With TiO 2 nanofilm, Stambolova et al (Stambolova et al, 2012) reported approximately 80% degradation in 180 min in a batch process where the nanofilm was sprayed with the dye solution. Recent studies by Suhadolnik et al (2019) reported only 10% degradation in their continuous design. This efficiency was further improved to 100% using more sophisticated design that utilized a complicated hybrid system of photo-electro catalytic degradation.…”

“…In semiconductors, the production of electron and hole pairs is governed by the intensity of the illuminated light. This is an essential step in the formation of the active radicals Habibi et al (2005) 400 W Suspension Batch Less than 100% in 100 min Bansal et al (2010) 5 UV tubes each of 30 W Commercial TiO 2 Suspension Batch $100% in 15 h Stambolova et al (2012) 51 0 À5 W/cm 2 Nanofilm Batch $80% in 180 min Liu et al (2018) 15 W fibre optics Crystal film of commercial TiO 2 Continuous 99.1% in 2 h Suhadolnik et al (2019) 2.8 mW/cm 2 TiO 2 tube film Continuous 10% Figure 6. Photocatalytic degradation of the Novacron Red dye with and without TiO 2 nanoparticles (Inset: Pseudo first order kinetic plots of the dye solution for both experiments).…”

“…Flow systems have been implemented in the presented application due to the high demand for dye degradation in industries' wastes, especially in textile manufacturing fields, where flow processes are predominant. However, according to the authors' knowledge, degradation of azo dye using TiO 2 nanofilm in microfluidic systems is limited in the literature (de S a et al, 2018;Deepa, Meghna, & Kandasamy, 2014;Liu, Li, Wu, & Xia, 2018;Suhadolnik et al, 2019).…”

Analysis of Mass Transport through Anisotropic, Catalytic/Bio-Catalytic Membrane Reactors

“…An application of a membrane process with a suitable metallic membrane is the continuous removal of the product components, which can essentially improve the reactor efficiency. The calculation methodology used here can also be applied for packed bed reactors [36] or photcatalytic reactors when a strong volume change takes place [37]. These additional remarks might help readers to predict transport processes in reactions occurring in a fluid phase in the case of varying transport parameters, though deeper analysis of this topic was not the focus of the present paper.…”

Photo-microfluidic chip reactors for propene complete oxidation with TiO2 photocalyst using UV-LED light

“…This microreactor reached a total conversion of benzothiophene in 2.8 min and methyl orange in 40 s. [30] More recently Suhadolnik et al showed that the photoelectrocatalytic degradation in microreactors is very interesting due to a strong synergistic effect between the photocatalytic and electrocatalytic processes. [31,32] The most widely reported configuration reported in the literature for the microreactor is the wall-coated configuration and the reactions are performed in liguid phase. Another interesting configuration in the microreactors is the packed-bed configuration, due to the improvement of micro-mixing performance in the catalytic bed compared to wall-coated or other type of non-packed microchannels, moreover this configuration ensures a better contact of the reagent (liquid or gas) with the photocatalyst [33,34].…”