Inhibition effect of SO2 on NOx and VOCs during the photodegradation of synchronous indoor air pollutants at parts per billion (ppb) level by TiO2

Photocatalytic removal of SO2 over Mn doped titanium dioxide supported by multi-walled carbon nanotubes

“…In the photocatalytic oxidation process, sulfite was formed on the surface of TiO 2 . Ao et al [30] revealed that sulfite and nitrate deposited blocked the absorption sites of TiO 2 to inhibit SO 2 and NO conversion and thus deactivation occurred. In the presence of H 2 O, absorbed photocatalytic products (including sulfite and sulfate) can convert into dissolved photocatalytic products, which would be beneficial for the self-clean of photocatalysts [31,32].…”

Photocatalytic degradation of NOx gases using TiO2-containing paint: A real scale study

“…Mean values (g m −3 ) during the experimental days, measured at the outlet ventilator Experimental day Benzene mean concentration (g m −3 ) (number of samples: 4) Toluene mean concentration (g m −3 ) (number of samples: 4) m + p-Xylene mean concentration (g m −3 ) (number of samples: 4) o-Xylene mean concentration (g m −3 ) (number of samples: 4)lysts' surface[3,15,16]. During the laboratory scale tests NO (or NO 2 ) was the only pollutant in the chamber, while during the real scale the presence of VOCs were significant.…”

Photocatalytic removal of NO and HCHO over nanocrystalline Zn2SnO4 microcubes for indoor air purification

“…Among them, nitrogen oxides (NO x ) and formaldehyde (HCHO) are the representative omnipresent indoor air pollutants coming from the furnishings and decorating materials. For example, HCHO presents significant health effects as frequently causing cancer and other sickness, but the concentration of indoor HCHO usually might be at parts per billion (ppbv) to parts per million (ppmv) levels in China, which is much higher than the WHO guideline (80 ppbv) [4][5][6]. Therefore, a number of physical and chemical techniques, including physical adsorption, biofiltration, thermal catalysis, and photocatalytic oxidation, are well established for the purification of polluted air [3,[7][8][9].…”