Micro-sized TiO2 catalyst in powder form and as coating on porcelain grès tile for the photodegradation of phenol as model pollutant for water phase

Abstract

In presence of TiO 2 and irradiation, phenol can be degraded by hydroxyl radicals or directly via photogenerated carriers, as occurs in photocalytic processes. In this work a commercial micro-sized TiO 2 sample in powder form and industrially coated on porcelain grès tiles were tested in water remediation with phenol as model molecule. Firstly, we investigated the behaviour of the commercial micro-sized TiO 2 comparing the results with reference nano-sized catalyst in the phenol photodegradation process, widely studied in the last decades. Following the phenol concentration as well as the main intermediates formation over time by HPLC analysis, and the mineralization by TOC analysis, we presented results about the photocatalytic behaviour in terms of adsorption, by-products formation, and reaction rate at different phenol starting concentrations. In particular, with the photocatalytic tiles, phenol photodegradation percentage is almost the same at 15 ad 25 ppm (78% and 73% respectively), and much lower at 50 ppm (46%) after 6 hours of test.

Photocatalytic Degradation of Phenol Using Chemical Vapor Desposition Graphene Column

“…Graphene with UV irradiation synergistically functioned as the catalyst for hydrogen peroxide splitting, resulting in the enhancement of phenol's AOP. TiO 2 is a standard photocatalyst, in which Evonik P25 has been reported to completely degrade phenol 25 ppm in 400 min [28], and TiO 2 -coated quartz tube could degrade phenol of 100 mg/L within 4 h under UV irradiation [29]. Compared to both cases, the initial phenol concentration we used in this study (941.1 mg/L, 941 ppm) is much higher, showing a better catalytic efficiency.…”

Oxidative Inactivation of SARS-CoV-2 on Photoactive AgNPs@TiO2 Ceramic Tiles

“…In this investigation, we tested the antiviral activity of industrially coated AgNPs@TiO 2 tiles against the deactivation of SARS-CoV-2 in both dark and light conditions. The photocatalytic activity was already verified both on the bare powder and the industrially digitally printed ceramic tile, against different toxic air/water compounds such as organic dyes [27], drugs [28], and in abatement processes of NOx [29,30] and phenol [31]. Different bacteria strains were investigated, and both the complete degradation and the absence of the biofilm formation were also confirmed [26,32].…”

Photocatalytic Degradation of Methylene Blue Using Zinc Oxide/Styrene Butadiene Rubber Photocatalyst

“…There are numerous substrates (supporting material) that have been used before including stainless steel [2], indium tin oxide (ITO) glass [3], porcelain grès tile [4], latex styrene butadiene rubber (LSBR) [5] and natural rubber (NR) [6]. These substrates, however, have many limitations for industrial applications, for instance, expensive and the possibility of photocatalyst leaching out during application.…”