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The study for polyaromatic hydrocarbons decay on Chinese coal soot particles in atmosphere

Journal of environmental Sciences 1991年第3期3卷 71-80页

作者： shu yonghui, li {2. and wang wenxingchinese research academy of environmental Sciences,beijing 100012.china

A study for the photochemical behavior of some polyaromatic hydrocarbons (PAH), for example B(a )P, B( k )F and fluoranthene in coal smoke particles was performed by using indoor Teflon smog *** suggest that the photochemical reaction of PAH is first order reaction and kinetic rates of some PAH were obtained. It was shown that the reaction rate constant is proportional to light intensity and water vapor concentration. Temperature and PAH loading also have influence on PAH decay rate. A model for PAH loss has been set up on the basis of the results of our experiments and the simulating results of this model suggest that coal particle PAH half lives are of the order of a period of days in winter and a few hours in summer. Other factors which may have effect on the photochemical reaction of PAH have also been discussed.

关键词： PAH photochemical reaction smog chamber kinetic rates.

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Introducing oxygen vacancies in TiO_(2. lattice through trivalent iron to enhance the photocatalytic removal of indoor NO

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矿物冶金与材料学报:英文版 2023年第10期30卷 2025-2035页

作者： Peng Sun Sumei Han jinhua liu Jingjing Zhang {2.o Yang Faguo wang Wenxiu liu {2. Yin Zhanwu Ning Wenbin Cao Institute of Urban Safety and environmental Science Beijing Academy of Science and TechnologyBeijing 100054China School of Materials Science and Engineering University of Science and Technology BeijingBeijing 100083China beijing Wetech environmental Sci-Tech Co. Ltd.Beijing 100083China Institute of Multidisciplinary research for Advanced Materials(IMRAM) Tohoku UniversityKatahira 2-1-1Aoba-kuSendai 980-8577Japan Advanced Institute for Materials research(WPI-AIMR) Tohoku UniversityKatahira 2-1-1Aoba-kuSendai 980-8577Japan Tianjin College University of Science and Technology BeijingTianjin 301830China

The synthesis of oxygen vacancies(OVs)-modified TiO_(2.under mild conditions is *** this work,OVs were easily introduced in TiO_(2.lattice during the hydrothermal doping process of trivalent iron *** calculations based on a novel charge-compensation structure model were employed with experimental methods to reveal the intrinsic photocatalytic mechanism of Fe-doped TiO_(2.(Fe-TiO_(2.).The OVs formation energy in Fe-TiO_(2.(1.12.eV)was only 2..6%of that in TiO_(2.(4.74 eV),explaining why Fe^(3+)doping could introduce OVs in the TiO_(2.*** calculation results also indicated that impurity states introduced by Fe^(3+)and OVs enhanced the light absorption activity of TiO_(2..Additionally,charge carrier transport was investigated through the carrier lifetime and relative *** carrier lifetime of Fe-TiO_(2.(4.00,4.10,and 3.34 ns for 1at%,2.t%,and 3at%doping contents,respectively)was longer than that of undoped TiO_(2.(3.2. ns),indicating that Fe^(3+) and OVs could promote charge carrier separation,which can be attributed to the larger relative effective mass of electrons and ***,Fe-TiO_(2.has higher photocatalytic indoor NO removal activity compared with other photocatalysts because it has strong light absorption activity and high carrier separation efficiency.

关键词： oxygen vacancies density functional theory calculations iron-doped titanium dioxide carrier separation photocatalytic removal of indoor nitric oxide

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