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Non-Thermal Plasma Assisted Regeneration of Acetone Adsorbed TiO2 Surface

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Abstract

Improvement of indoor air quality regarding volatile organic compounds (VOCs) requires the development of innovative oxidation processes. This paper investigates the coupling of a metal oxide sorbent with non-thermal plasma (NTP) in an especially designed reactor. TiO2 was selected as model sorbent and acetone was used as model VOC. The analyses of gas phase species at the reactor downstream have been performed using FTIR spectroscopy. In a first step, acetone adsorption on TiO2 surface under dry air was characterized in terms of total amount adsorbed, as well as reversibly and irreversibly adsorbed fractions. Obtained results were compared and discussed with literature in terms of acetone reactive adsorption on TiO2 surface. Mesityloxide was proposed as the major compound in the irreversibly adsorbed fraction. In a second time, acetone saturated TiO2 surface was exposed to NTP surface discharge. Irrespectively of the injected power, <30 % of the initially adsorbed acetone has been recovered as CO, CO2 and desorbed acetone. Finally, thermal desorptions have been performed. They evidenced that (1) NTP treatment modifies the nature of the adsorbed organic species, (2) mineralization rate is considerably improved. Based on desorbed species temporal profile analysis, carboxylates and more especially formates are suggested as major adsorbed species after NTP treatment (Pinj > 0.2 W). This hypothesis has been evaluated and confirmed. This paper finally evidenced that NTP can be used as an efficient pretreatment technique to promote the mineralization of adsorbed acetone for further thermal treatment.

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Acknowledgments

The authors greatly acknowledge the French National Research Agency (ANR) for its financial support. Experiments have been performed in the framework of the RAMPE project supported by the ANR-Blanc program. The authors also acknowledge Vincent Gaudion for its efficient technical support.

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Correspondence to F. Thevenet.

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Sivachandiran, L., Thevenet, F. & Rousseau, A. Non-Thermal Plasma Assisted Regeneration of Acetone Adsorbed TiO2 Surface. Plasma Chem Plasma Process 33, 855–871 (2013). https://doi.org/10.1007/s11090-013-9463-7

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  • DOI: https://doi.org/10.1007/s11090-013-9463-7

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