Enhancement of solar photocatalytic detoxification by adsorption of porphyrins onto TiO sub 2

Conference · Mon Dec 31 23:00:00 EST 1990

OSTI ID:5858159

Majumder, S A; Ondrias, M R ^[1]; Prairie, M R ^[2]; Shelnutt, J A ^[3]

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1. New Mexico Univ., Albuquerque, NM (United States). Dept. of Chemistry
2. Sandia National Labs., Albuquerque, NM (United States)
3. New Mexico Univ., Albuquerque, NM (United States). Dept. of Chemistry Sandia National Labs., Albuquerque, NM (United States)

Titanium dioxide (TiO{sub 2}) is a photocatalyst for solar detoxification of water containing organic contaminants such as solvents, PCB's, dioxins, pesticides, and dyes. Unfortunately, the ultraviolet (UV) energy used by TiO{sub 2} ({lambda}<400 nm) only comprises about 4% of the solar spectrum. One way of enhancing the efficiency of solar detoxification technologies is to utilize a larger portion of the solar spectrum to initiate the Tio{sub 2}- catalyzed detoxification chemistry. Metalloporphyrins strongly absorb visible and near infrared radiation. By utilization of a process called photosensitization, adsorption of these dyes onto TiO{sub 2} can enable a much broader portion of the solar spectrum to be used. Photosensitization relies upon the ability of the dye molecule to absorb more of the solar energy than bare TiO{sub 2} and to interact electronically with the TiO{sub 2} surface in such a way as to initiate TiO{sub 2}-based redox photochemistry using the dye-absorbed energy. 16 refs., 7 figs.

• Research Organization: Sandia National Labs., Albuquerque, NM (United States)
• Sponsoring Organization: DOE; USDOE, Washington, DC (United States)
• DOE Contract Number: AC04-76DP00789
• OSTI ID: 5858159
• Report Number(s): SAND-91-1856C; CONF-920436--4; ON: DE92000243
• Country of Publication: United States
• Language: English

Related Subjects

14 SOLAR ENERGY
140505* -- Solar Energy Conversion-- Photochemical
Photobiological
&amp; Thermochemical Conversion-- (1980-)
37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400500 -- Photochemistry
CARBOXYLIC ACIDS
CHALCOGENIDES
CHEMICAL REACTIONS
COMPLEXES
DECOMPOSITION
DETOXIFICATION
HETEROCYCLIC ACIDS
HETEROCYCLIC COMPOUNDS
HYDROGEN COMPOUNDS
HYDROXY ACIDS
NICKEL COMPLEXES
ORGANIC ACIDS
ORGANIC COMPOUNDS
ORGANIC NITROGEN COMPOUNDS
OXIDES
OXYGEN COMPOUNDS
PHOTOSENSITIVITY
PORPHYRINS
SALICYLIC ACID
SENSITIVITY
TIN COMPLEXES
TITANIUM COMPOUNDS
TITANIUM OXIDES
TRANSITION ELEMENT COMPLEXES
TRANSITION ELEMENT COMPOUNDS
WATER