The rate of photocatalytic oxidation of aromatic volatile organic compounds in the gas-phase

Boulamanti, Aikaterini K.; Korologos, Christos A.; Philippopoulos, C.J.

doi:10.1016/j.atmosenv.2008.07.016

Cited by 52 publications

(20 citation statements)

References 9 publications

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“…Photogenerated electrons have strong reductivity and reduce the electronreceptor on the surface of semiconductors. According to the results of these experiments and the published literature [13][14][15], the mechanism of photocatalytic oxidation of HCHO on the TiO 2 surface may be described as equations (4) …”

Section: Mechanism Of Photocatalytic Oxidation Of Hcho On the Tio 2 Smentioning

confidence: 99%

Heterogeneous reaction of formaldehyde on the surface of TiO2 particles

Zhu

Tang

et al. 2010

Sci. China Chem.

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The heterogeneous reaction of formaldehyde (HCHO) on the surface of titanium dioxide (TiO 2 ) was investigated in situ using diffuse reflectance infrared Fourier transform spectroscopy (DRIFTS) combined with ion chromatography (IC), X-ray diffraction (XRD), and transmission electron microscopy (TEM). Formate, dioxymethylene, methoxy, and polyoxymethylene were observed in the infrared spectra of TiO 2 particles during the reaction. On the surface of TiO 2 , the adsorbed HCHO was first oxidized to dioxymethylene and further oxidized to formate. The effects of temperature and ultraviolet radiation (UV) on the reaction products and reactive uptake coefficients were studied, and the results indicate that the reaction rate can be accelerated at increasing temperatures as well as under UV. The heterogeneous reaction mechanisms of HCHO on the surface of TiO 2 in the dark and under UV irradiation are proposed. Kinetic measurements show that formate formation on TiO 2 is second order in HCHO concentration and the initial reactive uptake coefficients at room temperature calculated with the Brunauer-EmmettTeller specific surface area are (0.5-5) × 10 8 ([HCHO]: 1 × 10 13 -2 × 10 14 molecules/cm 3 ). A linear function relationship exists between the uptake coefficient and the concentration. The apparent activation energy of the reaction was also determined.

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Section: Mechanism Of Photocatalytic Oxidation Of Hcho On the Tio 2 Smentioning

confidence: 99%

Heterogeneous reaction of formaldehyde on the surface of TiO2 particles

Zhu

Tang

et al. 2010

Sci. China Chem.

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“…Despite the known advantages of PCO, generation of hazardous by‐products, which can be even more harmful than the target pollutant (i.e., O 3 , CO, and organic by‐products), can be significant in this process. Moreover, low efficiency and slow reaction rate are other deficiencies which highlight the necessity of more studies to enhance the capability of this method for indoor environment application .…”

Section: Introductionmentioning

confidence: 99%

Plasma‐Based Indoor Air Cleaning Technologies: The State of the Art‐Review

Bahri

Haghighat

2014

CLEAN Soil Air Water

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The negative impact of the presence of volatile organic compounds (VOCs) on indoor air quality has motivated researchers to develop different air treatment technologies. Although, building mechanical ventilation systems can provide a comfortable thermal indoor environment, they are not capable of removing the VOCs effectively. Thus, other components must be integrated with them to be able to carry out this function. Plasmabased air treatment techniques are a series of processes in which a high voltage discharge is used for elimination of VOCs. Development of plasma-based methods, and their capabilities for chemical gas decomposition, has motivated designers to employ these methods for indoor air purification. This paper addresses the outcomes of a critical literature review on plasma-based air cleaner technologies, thermal to non-thermal plasma and plasma catalyst, and their application for indoor environment VOCs removal. The reaction mechanism, effect of different parameters on the performance of the method, and abilities and limitations of these methods are discussed. Different types of reactors and the most common used catalysts are classified. The role of the presence of the catalyst in improving the non-thermal plasma efficiency is reviewed. Finally, the scope of the future work to enhance the performance of this method for application in sustainable buildings is discussed.

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“…The employment of new technologies with the generic term “advanced oxidation processes (AOPs)” leads to the decomposition and mineralization of many groups of organic materials in both the liquid and gas phases. Depending on the chemical structure of the pollutant molecules, AOPs mineralize numerous pollutants into ultimately harmless substances like CO 2 and H 2 O.…”

Section: Introductionmentioning

confidence: 99%

Treatment of pyrolysis wastewater using heterogeneous advanced oxidation processes

Mehrjouei

Müller

Möller

2013

Env Prog and Sustain Energy

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In this study, treatment of a real wastewater sample produced in a thermal pyrolysis plant for plastic waste disposal was performed using a practical design of multiphase falling film reactor. The reduction in the level of chemical oxygen demand (COD) as well as color removal of this type of wastewater was evaluated by means of three different heterogeneous advanced oxidation processes (TiO2/UVA/O2, TiO2/O3, and TiO2/UVA/O3). In addition, the effect of acidification of this type of wastewater as well as the influence of the content of phosphate anions existing in the wastewater for biological treatment purposes on several treatment aspects were investigated and discussed in detail. The COD level of pyrolysis wastewater was decreased by about 32 and 38% after 1 h of treatment using the catalytic ozonation and photocatalytic ozonation approaches, respectively, while the decrease in the COD of this wastewater was negligible during the photocatalytic oxidation. The wastewater color was completely removed after 40 min of treatment using both ozone‐based oxidation systems, while the photocatalytic oxidation led to a slight decrease in color extinction by about 10% after 1 h of treatment. © 2013 American Institute of Chemical Engineers Environ Prog, 33: 178–183, 2014

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The rate of photocatalytic oxidation of aromatic volatile organic compounds in the gas-phase

Cited by 52 publications

References 9 publications

Heterogeneous reaction of formaldehyde on the surface of TiO2 particles

Heterogeneous reaction of formaldehyde on the surface of TiO2 particles

Plasma‐Based Indoor Air Cleaning Technologies: The State of the Art‐Review

Treatment of pyrolysis wastewater using heterogeneous advanced oxidation processes

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