Adsorption and degradation of model volatile organic compounds by a combined titania–montmorillonite–silica photocatalyst

Pollution profiles, health risk of VOCs and biohazards emitted from municipal solid waste transfer station and elimination by an integrated biological-photocatalytic flow system: A pilot-scale investigation

“…This result is consistent with reference finding that PC oxidation rate of methyl tertiary-butyl ether increases linearly at very low concentrations [35]. This is due to that before the pollutants were photocatalytically degraded, they need to be adsorbed firstly onto photocatalyst surface sites [14] and the efficient adsorption of toxic substances onto TiO 2 is an important factor determining its degradation ability at very low concentrations [14,36]. In addition, the PC REs of dichloroethane and tetrachloroethylene were not demonstrated since they could not be detected at the inlet during compressor off.…”

“…Few substances are still unable to be biologically degraded, although this technology is relatively cheap and reliable process. On the other hand, photocatalytic (PC) technology can generate powerful but not selective oxidant species, such as holes and active oxygen species, which can not only readily oxidize a wide spectrum of organic gas [14][15][16], but also inactivate the pathogens effectively [17][18][19]. Nevertheless, there are several scenarios that make them economically disadvantageous.…”

Treatment of organic waste gas in a paint plant by combined technique of biotrickling filtration with photocatalytic oxidation

“…As for other VOCs, the REs obtained were lower than before, suggesting that a negative effect occurred as the sudden increase of EA and Tol. It was considered that the inhibition may be a consequence of competition reaction onto the catalyst [29] and the mutual inhibition effect on the removal efficiencies of individual compound by the other components for multi-component degradation [42]. Despite slightly fluctuating of the concentrations of TVOC between on the 45th and 90th day, TVOC PCO REs still high which ranged from 71.6% to 96.2%, suggesting that long-term high photocatalytic activity of TiO 2 film under UV 254+185nm irradiation to remove of VOCs could be achieved in this pilot-scale study.…”

“…Based on long-term stable VOCs biodegradation efficiency of biological treatment and broad selectivity for various VOCs of PCO [20,29], the integration of PCO and biological treatment have been attemped. For instance, with the combination of a photocatalytic reactor and a biofilter, Hinojosa-Reyes et al [26] obtained an increase up to 36% additional ethylbenzene (EB) removal compared with the individual treatment.…”

VOCs elimination and health risk reduction in e-waste dismantling workshop using integrated techniques of electrostatic precipitation with advanced oxidation technologies

“…Among these AOTs, photocatalysis (PC) has attracted considerable attention for degrading organics, given its generation of powerful and non-selective oxidant active species [11,12]. Furthermore, numbers of VOCs with small and large molecular weights can be successfully photocatalytically degraded under various conditions, indicating PC technology's excellent and non-selective ability to remove VOCs [13][14][15]. However, this single treatment technology has a significant drawback, in that photocatalyst deactivation may occur, resulting in a gradual decrease of PC activity [16][17][18].…”