Photocatalytic decomposition of gaseous HCHO by ZrxTi1−xO2 catalysts under UV–vis light irradiation with an energy-saving lamp

Removal of Indoor Volatile Organic Compounds via Photocatalytic Oxidation: A Short Review and Prospect

“…RH is also the key factor for formaldehyde degradation, which has been demonstrated with the photocatalytic performances of Zr x Ti 1−x O 2 at different RHs of 50% ± 5%, 65% ± 5%, 85% ± 5%, respectively [127]. The work reported that the activity is the highest at RH of 50% ± 5%, representing that the photocatalytic reaction can be suppressed at humid environments.…”

Study on photocatalytic performance of cerium-graphene oxide-titanium dioxide composite film for formaldehyde removal

“…Many studies have reported that the degradation reactions of formaldehyde fit well with the Langmuir–Hinshelwood first order kinetics equation . The kinetics of this degradation experiment were also fitted to a first‐order reaction, and rate constant ( k ) was quantitatively shown in Fig.…”

“…The pure TiO 2 shows poor photocatalytic activity and its k is only 0.47 × 10 −3 min −1 , which demonstrates that TiO 2 is almost no response to visible light due to its wide band gap (3.2 eV). When GO is added to TiO 2 through chemical bonding methods, GO‐TiO 2 exhibits an increase of photocatalytic activity that is 2.5 times that of pure TiO 2 , which might be related with inhibiting recombination of electron–hole pairs due to a good supporting provided by GO for charge transport from TiO 2 to graphene layers via the interfaces . Particularly, the photocatalytic activity of Ce‐GO‐TiO 2 is enhanced significantly with GO and Ce co‐doping, and the k reaches the highest value of 4.16 × 10 −3 min −1 , which exceeds that of pure TiO 2 by 9.5 times.…”

TiO2 Co-doped with Zr and Ag shows highly efficient visible light photocatalytic behavior suitable for treatment of polluted water

“…When ZA co-doped TiO 2 was activated under light source, electrons transferred from valence band (vb) to conduction band (cb) of induced Ag particles, producing electron-hole pairs. 58,59 The Ag cb electrons migrated to cb of doped titania, MB was simultaneously photo-sensitized, and migrated cb electron were injected into cb of doped titania. Following this, oxygen molecules (O 2 ) were reduced by migrated electrons into active oxygen radicals ðO * 2 Þ, and vb of Ag particles reacted with water molecules (H 2 O) to produce hydroxyl radicals (OH*).…”