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Photocatalytic oxidation of indoor toluene: process risk analysis and influence of relative humidity, photocatalysts, and VUV irradiation.
Sci Total Environ. 2012 Nov 01; 438:201-9.ST

Abstract

Concentrations of 13 gaseous intermediates in photocatalytic oxidation (PCO) of toluene in indoor air were determined in real-time by proton transfer reaction mass spectrometry and desorption intensities of 7 adsorbed intermediates on the surface of photocatalysts were detected by temperature-programmed desorption-mass spectrometry. Effects of relative humidity (RH), photocatalysts, and vacuum ultraviolet (VUV) irradiation on the distribution and category of the intermediates and health risk influence index (η) were investigated. RH enhances the formation rate of hydroxide radicals, leading to more intermediates with higher oxidation states in gas phase. N doping promotes the separation of photo-generated electrons and holes and enhances PCO activity accordingly. VUV irradiation results in higher mineralization rate and more intermediates with higher oxidation states and lower toxicity e.g. carboxylic acids. Health risk analysis indicates that higher RH, N doping of TiO(2), and VUV lead to "greener" intermediates and smaller η. Finally, a conceptual diagram was proposed to exhibit the scenario of η varied with extent of mineralization for various toxicities of inlet pollutants.

Authors+Show Affiliations

Department of Environmental Engineering, Zhejiang University, Hangzhou 310058, China. weirong@mail.hz.zj.cnNo affiliation info availableNo affiliation info availableNo affiliation info availableNo affiliation info availableNo affiliation info availableNo affiliation info availableNo affiliation info available

Pub Type(s)

Journal Article
Research Support, Non-U.S. Gov't

Language

eng

PubMed ID

23000545

Citation

Zhao, Weirong, et al. "Photocatalytic Oxidation of Indoor Toluene: Process Risk Analysis and Influence of Relative Humidity, Photocatalysts, and VUV Irradiation." The Science of the Total Environment, vol. 438, 2012, pp. 201-9.
Zhao W, Dai J, Liu F, et al. Photocatalytic oxidation of indoor toluene: process risk analysis and influence of relative humidity, photocatalysts, and VUV irradiation. Sci Total Environ. 2012;438:201-9.
Zhao, W., Dai, J., Liu, F., Bao, J., Wang, Y., Yang, Y., Yang, Y., & Zhao, D. (2012). Photocatalytic oxidation of indoor toluene: process risk analysis and influence of relative humidity, photocatalysts, and VUV irradiation. The Science of the Total Environment, 438, 201-9. https://doi.org/10.1016/j.scitotenv.2012.08.081
Zhao W, et al. Photocatalytic Oxidation of Indoor Toluene: Process Risk Analysis and Influence of Relative Humidity, Photocatalysts, and VUV Irradiation. Sci Total Environ. 2012 Nov 1;438:201-9. PubMed PMID: 23000545.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Photocatalytic oxidation of indoor toluene: process risk analysis and influence of relative humidity, photocatalysts, and VUV irradiation. AU - Zhao,Weirong, AU - Dai,Jiusong, AU - Liu,Feifei, AU - Bao,Jiaze, AU - Wang,Yan, AU - Yang,Yong, AU - Yang,Yanan, AU - Zhao,Dongye, Y1 - 2012/09/19/ PY - 2012/06/04/received PY - 2012/08/06/revised PY - 2012/08/19/accepted PY - 2012/9/25/entrez PY - 2012/9/25/pubmed PY - 2013/4/16/medline SP - 201 EP - 9 JF - The Science of the total environment JO - Sci. Total Environ. VL - 438 N2 - Concentrations of 13 gaseous intermediates in photocatalytic oxidation (PCO) of toluene in indoor air were determined in real-time by proton transfer reaction mass spectrometry and desorption intensities of 7 adsorbed intermediates on the surface of photocatalysts were detected by temperature-programmed desorption-mass spectrometry. Effects of relative humidity (RH), photocatalysts, and vacuum ultraviolet (VUV) irradiation on the distribution and category of the intermediates and health risk influence index (η) were investigated. RH enhances the formation rate of hydroxide radicals, leading to more intermediates with higher oxidation states in gas phase. N doping promotes the separation of photo-generated electrons and holes and enhances PCO activity accordingly. VUV irradiation results in higher mineralization rate and more intermediates with higher oxidation states and lower toxicity e.g. carboxylic acids. Health risk analysis indicates that higher RH, N doping of TiO(2), and VUV lead to "greener" intermediates and smaller η. Finally, a conceptual diagram was proposed to exhibit the scenario of η varied with extent of mineralization for various toxicities of inlet pollutants. SN - 1879-1026 UR - https://www.unboundmedicine.com/medline/citation/23000545/Photocatalytic_oxidation_of_indoor_toluene:_process_risk_analysis_and_influence_of_relative_humidity_photocatalysts_and_VUV_irradiation_ L2 - https://linkinghub.elsevier.com/retrieve/pii/S0048-9697(12)01173-4 DB - PRIME DP - Unbound Medicine ER -