Photodegradation of gaseous volatile organic compounds (VOCs) using TiO2 photoirradiated by an ozone-producing UV lamp: decomposition characteristics, identification of by-products and water-soluble organic intermediates

Abstract. The European PartEmis project (''Measurement and prediction of emissions of aerosols and gaseous precursors from gas turbine engines'') was focussed on the characterisation and quantification of exhaust emissions from a gas turbine engine. A comprehensive suite of aerosol, gas and chemi-ion measurements were conducted under different combustor operating conditions and fuel sulphur concentrations. Combustion aerosol characterisation included on-line measurements of mass and number concentration, size distribution, mixing state, thermal stability of internally mixed particles, hygroscopicity, cloud condensation nuclei (CCN) activation potential, and off-line analysis of chemical composition. Modelling of CCN activation of combustion particles was conducted using microphysical and chemical properties obtained from the measurements as input data. Based on this unique data set, the role of sulphuric acid coatings on the combustion particles, formed in the cooling exhaust plume through either direct condensation of gaseous sulphuric acid or coagulation with volatile condensation particles nucleating from gaseous sulphuric acid, and the role of the organic fraction for the CCN activation of combustion particles was investigated. It was found that particles containing a large fraction of non-volatile organic compounds grow significantly less at high relative humidity than particles with a lower content of non-volatile OC. Also the effect of the non-volatile OC fraction on the potential CCN activation is significant. While a coating of water-soluble sulphuric acid increases the potential CCN activation, or lowers the activation diameter, respectively, the non-volatile organic compounds, mainly found at lower combustion temperatures, can partially compensate this sulphuric acid-related enhancement of CCN activation of carbonaceous combustion aerosol particles.

Download Full-text

Seasonal Distributions and Stable Carbon Isotope Ratios of Water-Soluble Diacids, Oxoacids, and α-Dicarbonyls in Aerosols from Sapporo: Influence of Biogenic Volatile Organic Compounds and Photochemical Aging

ACS Earth and Space Chemistry ◽

10.1021/acsearthspacechem.8b00105 ◽

2018 ◽

Vol 2 (12) ◽

pp. 1220-1230 ◽

Cited By ~ 5

Author(s):

Chandra Mouli Pavuluri ◽

Kimitaka Kawamura ◽

Pingqing Fu

Keyword(s):

Volatile Organic Compounds ◽

Organic Compounds ◽

Stable Carbon Isotope ◽

Water Soluble ◽

Stable Carbon ◽

Biogenic Volatile Organic Compounds ◽

Stable Carbon Isotope Ratios ◽

Carbon Isotope Ratios ◽

Volatile Organic ◽

Photochemical Aging

Download Full-text

Concentration of water-soluble volatile organic compounds from aqueous samples by azeotropic microdistillation

Environmental Science & Technology ◽

10.1021/es00025a018 ◽

1992 ◽

Vol 26 (1) ◽

pp. 160-163 ◽

Cited By ~ 6

Author(s):

Mark L. Bruce ◽

Richard P. Lee ◽

Marvin W. Stephens

Keyword(s):

Volatile Organic Compounds ◽

Organic Compounds ◽

Water Soluble ◽

Aqueous Samples ◽

Volatile Organic

Download Full-text

Determination of VOCs in the Indoor Air of a New and a Renovated Apartment

Selected Scientific Papers - Journal of Civil Engineering ◽

10.1515/sspjce-2016-0012 ◽

2016 ◽

Vol 11 (1) ◽

pp. 107-118 ◽

Cited By ~ 1

Author(s):

Ludmila Meciarova ◽

Silvia Vilcekova

Keyword(s):

Volatile Organic Compounds ◽

Organic Compounds ◽

Indoor Air ◽

Data Logger ◽

Volatile Organic ◽

Uv Lamp ◽

Total Volatile Organic Compounds ◽

Flooring Materials ◽

Qualitative Determination

Abstract This study deals with the occurrence of volatile organic compounds (VOCs) in the indoor environment of a new and a renovated apartment. Qualitative determination of VOCs was carried out with a gas chromatograph with surface acoustic wave detector (GC/SAW). Concentrations of total volatile organic compounds (TVOC) were determined by a photoionization detector with UV lamp. Simultaneously, temperature and relative humidity were monitored with a data logger. The aim of this study was to determine of TVOC concentrations, to use of GC/SAW for determination of individual VOCs in indoor air as well as to predict possible sources of VOCs in these apartments. Measurements were performed after each construction work for better resolution of the contributions of individual materials to the levels of VOC. Mean concentrations of TVOC were 624 μg/m3 in the renovated apartment and 1,686 μg/m3 in the new apartment after completion of all works. The results from the renovated apartment showed that the use of new materials can lead to lower levels of organic compounds in indoor air compared to old materials that were less environmentally friendly. Many types of VOCs were found in both apartments. After reviewing the possible sources, it seems that the main sources of these substances were applied coatings and flooring materials.

Download Full-text