Heterogeneous photocatalytic oxidation of gas-phase organics for air purification: Acetone, 1-butanol, butyraldehyde, formaldehyde, and m-xylene oxidation
TL;DR: In this article, photocatalyzed degradations of trace levels of various oxygenates and an aromatic in air were carried out using near-UV-illuminated titanium dioxide (anatase) powder.
About: This article is published in Journal of Catalysis.The article was published on 1992-08-01. It has received 498 citations till now. The article focuses on the topics: Butyraldehyde & Acetone.
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TL;DR: The field of photocatalysis can be traced back more than 80 years to early observations of the chalking of titania-based paints and to studies of the darkening of metal oxides in contact with organic compounds in sunlight as discussed by the authors.
5,729 citations
TL;DR: In this paper, photo-induced superhydrophilicity was used on the surface of a wide-band gap semiconductor like titanium dioxide (TiO 2 ) for photocatalytic activity towards environmentally hazardous compounds.
4,241 citations
TL;DR: An overview of the field of semiconductor photocatalysis can be found in this paper, where a brief examination of its roots, achievements and possible future is presented, and the semiconductor titanium dioxide (TiO 2 ) features predominantly in past and present work.
Abstract: The interest in heterogeneous photocatalysis is intense and increasing, as shown by the number of publications on this theme which regularly appear in this journal, and the fact that over 2000 papers have been published on this topic since 1981. This article is an overview of the field of semiconductor photocatalysis : a brief examination of its roots, achievements and possible future. The semiconductor titanium dioxide (TiO 2 ) features predominantly in past and present work on semiconductor photocatalysis; as a result, in the most of the examples selected in this overview to illustrate various points the semiconductor is TiO 2 .
3,245 citations
TL;DR: In this article, rare earth (RE=La3+, Ce3+, Er3+, Pr3+, Gd3+-doped, Nd3+, Sm3+, Nd4+, Sm5+ and Sm6+ were used as precursors for the synthesis of RE/TiO2 photocatalysts, which were characterized by XRD, IR, UV-vis diffuse reflection and transient absorption spectra.
1,067 citations
TL;DR: A review of the status of research on photocatalytic oxidation (PCO) purification of VOCs in indoor air can be found in this paper, where some recommendations are made for future work to evaluate the performance of PCO catalysts, to reduce the generation of harmful intermediates and to design new PCO reactors with integrated UV source and reaction surface.
741 citations
Cites background or result from "Heterogeneous photocatalytic oxidat..."
...By considering the inhibiting effects (e.g., competitive adsorption) of multi-compounds (Lewandowski and Ollis, 2003a,b) and/or water vapor, and the effect of temperature, the ULH model has been improved by several types of formulas (see Table 3)....
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...H model (ULH) (Peral and Ollis, 1992; Sauer and Ollis, 1994; Biard et al., 2007; Shiraishi et al., 2007; Yang et al., 2007): r ¼ kqR ¼ k K½R 1þ K½R (24) Eq....
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...For instance, Peral and Ollis (1992) found the rate of acetone oxidation decreased with increasing water vapor....
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...In that case, the BLH model was found to provide a better correlation with the oxidation rate data than the ULH model....
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...Table 4 lists some results from the ULH model (Jacoby et al., 1995; Alberici and Jardim, 1997; Noguchi and Fujishima, 1998; Obuchi et al., 1999; Zorn et al., 1999; Bouzaza et al., 2006; Biard et al., 2007; Yang et al., 2007; Zhang et al., 2007)....
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References
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Book•
29 Sep 1977
TL;DR: In this paper, the authors present basic concepts in Chemical Kinetics, such as determining the reaction rate expression and the reaction progress variable, for the design of Isothermal Reactors.
Abstract: Stoichiometric Coefficients and Reaction Progress Variables. Thermodynamics of Chemical Reactions. Basic Concepts in Chemical Kinetics--Determination of the Reaction Rate Expression. Basic Concepts in Chemical Kinetics--Molecular Interpretations of Kinetic Pheonomena. Chemical Systems Involving Multiple Reactions. Elements of Heterogeneous Catalysis. Liquid Phase Reactions. Basic Concepts in Reactor Design and Ideal Reactor Models. Selectivity and Optimization Considerations in the Design of Isothermal Reactors. Temperature and Energy Effects in Chemical Reactors. Deviations from Ideal Flow Conditions. Reactor Design for Heterogeneous Catalytic Reactions. Illustrative Problems in Reactor Design. Appendix A: Thermochemical Data. Appendix B: Fugacity Coefficient Chart. Appendix C: Nomenclature. Index.
561 citations
522 citations
TL;DR: This paper describes the process by which heterogeneous photocatalysis is used for the study of the degradation of chloromethanes, bromomethane, chloroethanes, chlor oethylenes and bromoethylenes, chlorobenzene, and chloroacetic acids in dilute aqueous solutions.
Abstract: This paper describes the process by which heterogeneous photocatalysis is used for the study of the degradation of chloromethanes, bromomethanes, chloroethanes, chloroethylenes and bromoethylenes, chlorobenzene, and chloroacetic acids in dilute aqueous solutions. Rate equations are presented for each of the halocarbons. In addition, solar applications and the potential use for water purification are discussed. 32 references, 6 figures, 1 table.
432 citations
TL;DR: In this paper, the complete mineralization of trichloroethylene (Cl2CCClH) in dilute aqueous solutions, to HCl and CO2, was demonstrated with heterogeneous photoassisted catalysis using illuminated titanium dioxide (TiO2).
418 citations
TL;DR: In this paper, the photocatalytic degradations of 2-chlorophenol (2CP) and 3-chlorphenol (3CP) in TiO{sub 2} aqueous suspensions at {λ > 340 nm have been studied.
Abstract: The photocatalytic degradations of 2-chlorophenol (2CP) and 3-chlorophenol (3CP) in TiO{sub 2} aqueous suspensions at {lambda} > 340 nm have been studied. They are faster than direct photolysis at {lambda} > 290 nm despite the additional number of photons available in this wavelength region and produce lower maximal concentrations of intermediates. Complete mineralization is achieved eventually; however, it requires a much longer time than dechlorination and dearomatization. Effects of radiant flux, wavelength, initial concentrations, and pH are examined. Para hydroxylation is the main pathway, so that 2CP and 3CP both give rise to chlorohydroquinone (CHQ), whereas formation of catechol (CT) is a very minor pathway in the degradation of 2CP. Further hydroxylation of CHQ and CT forms hydroxyhydroquinone, which rapidly decomposes to carboxylic acids and carbonyl compounds not identified yet.
363 citations