Environmental green chemistry as defined by photocatalysis
Abstract
Photocatalysis is efficient in several fields. Firstly, in selective mild oxidation: oxidation of gas and liquid hydrocarbons (alkanes, alkenes, cyclo-alkanes, aromatics) into aldehydes and ketons. Primary and secondary alcohols are also oxidized into their corresponding aldehydes or ketones. The high selectivity was ascribed to a photoactive neutral, atomic oxygen species. Once platinized (only 0.5wt.% Pt) titania may catalyze reactions involving hydrogen (deuterium-alkane isotopic exchange and alcohol dehydrogenation). For fine chemicals, high initial selectivities enable titania to address most of the twelve principles of "green chemistry", such as the synthesis of 4-tert-butyl-benzaldehyde, an important intermediate in perfume industry by direct selective oxidation of 4-tert-butyl-toluene with air. A new field recently appeared: thio-photocatalysis. Oxygen was replaced by sulfur, using H(2)S as a convenient and reactive source. For instance, the conversion of propene in 1-propanthiol was successfully obtained. The reaction was performed using either CdS or TiO(2). The latter was much more active than CdS. In environmental photocatalysis, titania becomes a total oxidation catalyst once in presence of water because of the photogeneration of OH radicals by neutralization of OH(-) surface groups by positive holes. Many toxic inorganic ions are oxidized in their harmless upper oxidized state. The total degradation of organic pollutants (pesticides, herbicides, insecticides, fungicides, dyes, etc. ...) is the main field of water photocatalytic decontamination. The UVA solar spectrum can de advantageously used as demonstrated by many campaigns performed in the solar pilot plant at the "Plataforma Solar de Almeria" (Spain).
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TiO2 has low selectivity because intermediate products of the photooxidation of aromatic molecules are commonly photomineralized.
“On the other hand, TiO 2 has low selectivity because intermediate products of the photooxidation of aromatic molecules are commonly photomineralized.135”
From Sustainable hybrid photocatalysts: titania immobilized on carbon materials derived from renewable and biodegradable resources (2016) · cites this paper as [135]
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- Authors
- Herrmann, J.-M., Duchamp, C., Karkmaz, M., Hoai, B. T., Lachheb, H., Puzenat, E., & Guillard, C.
- Affiliations
- Lyon 1 Université (FR)
- Corresponding author
- Herrmann, J.-M.
- Venue
- Journal of Hazardous Materials
- Publisher
- Elsevier BV
- Published
- 2007-07
- Volume
- 146
- Issue
- 3
- Pages
- 624-629
- ISSN
- 0304-3894 (ISSN-L)
- OpenAlex
- W2012137646
- Cited by
- 245
- References
- 13
- Citations by year
- 2026: 6 · 2025: 4 · 2024: 4 · 2023: 5 · 2022: 13 · 2021: 11 · 2020: 9 · 2019: 10 · 2018: 13 · 2017: 19 · 2016: 12 · 2015: 17 · 2014: 19 · 2013: 26 · 2012: 17
- FWCI
- 8.13
- Type
- journal article
- Language
- en
- Open access
- closed
- Locations
- Journal of Hazardous Materials (publishedVersion)
- PubMed (publishedVersion)
- HAL (submittedVersion)
- Funders
- Centre National de la Recherche Scientifique
- Université de Lyon
- Topics
- Physical Sciences › Energy › Renewable Energy, Sustainability and the Environment › TiO2 Photocatalysis and Solar Cells
- Physical Sciences › Energy › Renewable Energy, Sustainability and the Environment › Advanced Photocatalysis Techniques
- Physical Sciences › Environmental Science › Water Science and Technology › Advanced oxidation water treatment
- Keywords
- photocatalysis, green chemistry, titanium dioxide, selective oxidation, aldehyde and ketone synthesis, alcohol oxidation, alcohol dehydrogenation, hydrogen sulfide, propene oxidation, 1-propanethiol, CdS photocatalyst, hydroxyl radicals, total oxidation, pesticide degradation, dye degradation
- MeSH terms
- Catalysis, Oxidation-Reduction, Photochemistry, Titanium, Ultraviolet Rays, Water Pollutants, Chemical
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