Heterogeneous photocatalytic oxidation of methyl ethyl ketone under UV-A light in an LED-fluidized bed reactor

Hajaghazadeh, Mohammad; Vaiano, Vincenzo; Sannino, Diana; Kakooei, Hossein; Sotudeh‐Gharebagh, Rahmat; Ciambelli, Paolo

doi:10.1016/j.cattod.2013.08.020

Cited by 46 publications

(27 citation statements)

References 40 publications

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“…In a study conducted by Hajaghazadeh et al [18], PC500 (consisting of 100% anatase) yielded a higher reaction rate than P25 in the degradation of gaseous methylethylketone under UVA light. The superior photocatalytic activity of PC500 was attributed to its higher specific surface area (SSA).…”

Section: Introductionmentioning

confidence: 97%

Gas phase oxidation of n-decane and PCE by photocatalysis using an annular photoreactor packed with a monolithic catalytic bed coated with P25 and PC500

Monteiro

Miranda

Rodrigues-Silva

et al. 2015

Applied Catalysis B: Environmental

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a b s t r a c tPerchloroethylene (PCE) and n-decane are persistently present in the indoor air of several industrial/corporate facilities and households. The present paper reports studies on the photocatalytic oxidation (PCO) of n-decane and PCE using an annular photoreactor equipped with a compound parabolic collector (CPC) and packed with transparent cellulose acetate monolithic structures coated with two commercially available TiO 2 , namely PC500 and P25, under simulated solar light. Such configuration allowed the illumination of the whole tubular reactor perimeter and catalytic bed, enhancing therefore the photonic efficiency and to take advantage of the low pressure drop and the high surface-area-to-volume ratio, typical of honeycomb reactors. The influence of the type of TiO 2 , feed flow rate, pollutant concentration, relative humidity, gas-phase molecular oxygen and irradiance on the pollutants PCO was assessed. PC500 film showed higher conversion of both pollutants in comparison with P25 despite the lower mass of catalyst used for film coating. n-Decane (C dec,feed = 71 ppm) and PCE (C PCE,feed = 1095 ppm) conversions close to 100% were obtained operating at Q feed = 150 cm 3 min −1 ( = 88 s), I = 38.4 W UV m −2 and RH = 40%. The mineralization's of PCE over both photocatalytic films were similar. However, n-decane was 100% and 69% mineralized respectively over PC500 and P25 films, under the same operating conditions. In addition, competitive adsorption between the pollutants and water molecules on the TiO 2 film surface was observed above 20% of RH. Results obtained at low RH suggest that Cl • radical chain propagation reactions may be included in the PCO mechanism of PCE. Finally, the absence of oxygen drastically impairs the photoreaction.

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Section: Introductionmentioning

confidence: 97%

Gas phase oxidation of n-decane and PCE by photocatalysis using an annular photoreactor packed with a monolithic catalytic bed coated with P25 and PC500

Monteiro

Miranda

Rodrigues-Silva

et al. 2015

Applied Catalysis B: Environmental

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“…However, the main deficiency for the practical applications of TiO 2 is limited by its large band-gap (3.2 eV), meaning that it can be only active under the UV light irradiation [16][17][18][19][20][21]. The main research objectives are to increase the photocatalytic performances of TiO 2 through the doping of its crystalline structure with non-metal ions that reduces the http://dx.doi.org/10.1016/j.apcatb.2015.01.039 0926-3373/© 2015 Elsevier B.V. All rights reserved.…”

Section: Introductionmentioning

confidence: 99%

Nanostructured N-doped TiO2 coated on glass spheres for the photocatalytic removal of organic dyes under UV or visible light irradiation

Vaiano

Sacco

Sannino

et al. 2015

Applied Catalysis B: Environmental

241

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“…adsorption on activated carbon, flocculation and electrocoagulation are not efficient methods because the dyes remain in solid wastes, therefore creating secondary pollutions. Advanced oxidation processes (AOPs), such as heterogeneous photocatalysis, are an attractive alternative for the removal of soluble organic compounds because they are very effective in the degradation of non‐biodegradable organic contaminants in wastewater …”

Section: Introductionmentioning

confidence: 99%

N‐doped TiO₂/s‐PS aerogels for photocatalytic degradation of organic dyes in wastewater under visible light irradiation

Vaiano

Sacco

Sannino

et al. 2014

J of Chemical Tech & Biotech

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BACKGROUND: Heterogeneous photocatalysis for the degradation of non-biodegradable organic contaminants in wastewater is an alternative to traditional treatment techniques. Since the applications developed employ photocatalysts in powder form, a main disadvantage remains related to the recovery of photocatalysts from the treated wastewater, resulting in damage and shorter lifetime for the recirculation pumps. Structured photocatalysts offer a valid solution to simplify the process; however, they have to guarantee light transmission, long-term stability under different operating conditions and under mechanical stress. RESULTS: The photocatalytic performances of N-doped TiO 2 nanocomposite syndiotactic polystyrene aerogels (Nt-sPS) were analyzed in the presence of visible light. A widely used model pollutant, methylene blue (MB), was chosen to verify the photocatalytic performance. After about 180 min of irradiation, on Nt-sPS, the conversion of MB reached 30%, higher than that obtained (16%) when the photocatalyst is suspended as powder in the liquid reaction medium. CONCLUSION: N-doped TiO 2 , obtained by direct nitration during the hydrolysis of titanium tetraisopropoxide with ammonia solutions, was immobilized in s-PS aerogels, yielding high activity in the removal of methylene blue under visible light irradiation, in comparison with N-doped TiO 2 dispersed as powder in solution.

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Heterogeneous photocatalytic oxidation of methyl ethyl ketone under UV-A light in an LED-fluidized bed reactor

Cited by 46 publications

References 40 publications

Gas phase oxidation of n-decane and PCE by photocatalysis using an annular photoreactor packed with a monolithic catalytic bed coated with P25 and PC500

Gas phase oxidation of n-decane and PCE by photocatalysis using an annular photoreactor packed with a monolithic catalytic bed coated with P25 and PC500

Nanostructured N-doped TiO2 coated on glass spheres for the photocatalytic removal of organic dyes under UV or visible light irradiation

N‐doped TiO₂/s‐PS aerogels for photocatalytic degradation of organic dyes in wastewater under visible light irradiation

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Heterogeneous photocatalytic oxidation of methyl ethyl ketone under UV-A light in an LED-fluidized bed reactor

Cited by 46 publications

References 40 publications

Gas phase oxidation of n-decane and PCE by photocatalysis using an annular photoreactor packed with a monolithic catalytic bed coated with P25 and PC500

Gas phase oxidation of n-decane and PCE by photocatalysis using an annular photoreactor packed with a monolithic catalytic bed coated with P25 and PC500

Nanostructured N-doped TiO2 coated on glass spheres for the photocatalytic removal of organic dyes under UV or visible light irradiation

N‐doped TiO2/s‐PS aerogels for photocatalytic degradation of organic dyes in wastewater under visible light irradiation

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Product

Resources

About

N‐doped TiO₂/s‐PS aerogels for photocatalytic degradation of organic dyes in wastewater under visible light irradiation