Photocatalytic destruction of VOCs in the gas-phase using titanium dioxide

Alberici, Rosana M.; Jardim, Wilson F.

doi:10.1016/s0926-3373(97)00012-x

Cited by 455 publications

(219 citation statements)

References 35 publications

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“…Kinds of physical, chemical and biological techniques have been utilized to remove them from air [1][2][3]. Among these different end-of-pipe abatement techniques, activated carbon adsorption is the most widely used.…”

Section: Introductionmentioning

confidence: 99%

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

Chen

Zhao

et al. 2011

Journal of Hazardous Materials

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Section: Introductionmentioning

confidence: 99%

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

Chen

Zhao

et al. 2011

Journal of Hazardous Materials

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“…Studies by Stokke et al [11], Dijkstra et al [16], Cen et al [17], Alberci and Jardin [18], Kim and Hong [19], and Jacboy [20] reported that a UV-C-irradiated ("-max = 254 nm) reactor resulted in greater photocatalytic oxidation ofVOCs than a reactor irradiated with UV -A light ("-max = 365 nm), implying that a shorter wavelength light source (i.e., higher energy photons) is more efficient. However, interpretation of the results from these studies on the effect of wavelength of TiOz-assisted photocatalysis is confounded with the influence of light intensity as these studies were conducted either at different light intensities or the light intensity was not well defined.…”

mentioning

confidence: 97%

“…Previously, UV light sources of various wavelengths ranging between 250-400 nm, and with various intensities, have been used in TiOz-catalyzed photocatalysis [1,11,[16][17][18][19][20]. Studies by Stokke et al [11], Dijkstra et al [16], Cen et al [17], Alberci and Jardin [18], Kim and Hong [19], and Jacboy [20] reported that a UV-C-irradiated ("-max = 254 nm) reactor resulted in greater photocatalytic oxidation ofVOCs than a reactor irradiated with UV -A light ("-max = 365 nm), implying that a shorter wavelength light source (i.e., higher energy photons) is more efficient.…”

mentioning

confidence: 99%

The effect of photon source on heterogeneous photocatalytic oxidation of ethanol by a silica–titania composite

Coutts¹,

Levine²,

Richards³

et al. 2011

Journal of Photochemistry and Photobiology A: Chemistry

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Abstract:The objective of this study was to distinguish the effect of photon flux (i.e., photons per unit time reaching a surface) from that of photon energy (i.e., wavelength) of a photon source on the silica-titania composite (STC)-catalyzed degradation of ethanol in the gas phase.Experiments were conducted in a bench-scale annular reactor packed with STC pellets and irradiated with either a UV-A fluorescent black light blue lamp (Amax=365 nm) at its maximum light intensity or a UV-C germicidal lamp (Amax=254 nm) at three levels of light intensity. The STC-catalyzed oxidation of ethanol was found to follow zero-order kinetics with respect to CO 2 production, regardless of the photon source. Increased photon flux led to increased EtOH removal, mineralization, and oxidation rate accompanied by lower intermediate concentration in the effluent. The oxidation rate was higher in the reactor irradiated by UV-C than by UV-A (38.4 vs. 31.9 nM S-I) at the same photon flux, with similar trends for mineralization (53.9 vs.43.4%) and reaction quantum efficiency (i.e., photonic efficiency, 63.3 vs. 50.1 nmol CO 2 ~mol photons-I). UV-C irradiation also led to decreased intermediate concentration in the effluent . compared to UV -A irradiation. These results demonstrated that STC-catalyzed oxidation is enhanced by both increased photon flux and photon energy.

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“…Degussa P25 TiO 2 powder has a primary particle diameter of 30 nm, a surface area of 50 m 2 /g (Brunauer, Emmett, and Teller [BET]), and a crystal structure of 70% anatase and 30% rutile. 5,6 The TiO 2 coating procedure was described as follows. 8,21,22 First, the TiO 2 powder was suspended in distilled water by the ultrasonic tank (Branson 5200).…”

Section: Experimental Workmentioning

confidence: 99%

“…This process is effective in controlling a wide variety of VOCs, including alkanes, alkenes, alcohol, aromatics, chlorinated hydrocarbons, aldehydes, and ketones. [5][6][7][8][9] Rather than adsorbing VOCs on sorbent, the photocatalytic filter can oxidize VOCs to carbon dioxide (CO 2 ) and water (H 2 O). Furthermore, many studies showed that the PCO process is able to control the biological contaminations.…”

Section: Introductionmentioning

confidence: 99%

Effectiveness of Photocatalytic Filter for Removing Volatile Organic Compounds in the Heating, Ventilation, and Air Conditioning System

Lee

Huang

et al. 2006

Journal of the Air & Waste Management Association

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Nowadays, the heating, ventilation, and air conditioning (HVAC) system has been an important facility for maintaining indoor air quality. However, the primary function of typical HVAC systems is to control the temperature and humidity of the supply air. Most indoor air pollutants, such as volatile organic compounds (VOCs), cannot be removed by typical HVAC systems. Thus, some air handling units for removing VOCs should be added in typical HVAC systems. Among all of the air cleaning techniques used to remove indoor VOCs, photocatalytic oxidation is an attractive alternative technique for indoor air purification and deodorization. The objective of this research is to investigate the VOC removal efficiency of the photocatalytic filter in a HVAC system. Toluene and formaldehyde were chosen as the target pollutants. The experiments were conducted in a stainless steel chamber equipped with a simplified HVAC system. A mechanical filter coated with Degussa P25 titania photocatalyst and two commercial photocatalytic filters were used as the photocatalytic filters in this simplified HVAC system. The total air change rates were controlled at 0.5, 0.75, 1, 1.25, and 1.5 hr Ϫ1 , and the relative humidity (RH) was controlled at 30%, 50%, and 70%. The ultraviolet lamp used was a 4-W, ultraviolet-C (central wavelength at 254 nm) strip light bulb. The first-order decay constant of toluene and formaldehyde found in this study ranged from 0.381 to 1.01 hr Ϫ1 under different total air change rates, from 0.34 to 0.433 hr Ϫ1 under different RH, and from 0.381 to 0.433 hr Ϫ1 for different photocatalytic filters.

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Photocatalytic destruction of VOCs in the gas-phase using titanium dioxide

Cited by 455 publications

References 35 publications

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

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

The effect of photon source on heterogeneous photocatalytic oxidation of ethanol by a silica–titania composite

Effectiveness of Photocatalytic Filter for Removing Volatile Organic Compounds in the Heating, Ventilation, and Air Conditioning System

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