Actions for Enhancing solar photocatalytic detoxification by adsorption of porphyrins onto TiO sub 2 [electronic resource].

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Enhancing solar photocatalytic detoxification by adsorption of porphyrins onto TiO sub 2 [electronic resource].

Published
Washington, D.C. : United States. Dept. of Energy, 1991.
Oak Ridge, Tenn. : Distributed by the Office of Scientific and Technical Information, U.S. Dept. of Energy.
Physical Description
Pages: (11 pages) : digital, PDF file
Additional Creators
Sandia National Laboratories, United States. Department of Energy, and United States. Department of Energy. Office of Scientific and Technical Information
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Summary
Titanium dioxide (TiO₂) is a known photocatalyst for solar detoxification of water containing organic contaminants including PCB's and dioxins. Unfortunately, the UV light used by the photocatalyst only comprises about 4% of the strong spectrum. Metalloporphyrins strongly absorb in the visible and near infrared region. Using visible light, we have investigated Ni(II) uroporphyrin (NiUroP), Sn(IV)Cl₂ uroporphyrin (SnUroP) and Sn(IV)Cl₂ tetrakis(p-carboxyphenyl) porphyrin (SnTCPP) as possible enhancers of destruction of a model organic compound, salicylic acid (SA), by means of photosensitization of colloidal TiO₂ particles. All three porphyrins are found to adsorb reversibly onto the colloidal TiO₂ upon variation of pH. Adsorption of porphyrins results in the increased colloidal stability of fine TiO₂ particles in the pH range 5--8. While NiUroP on TiO₂ does not show any enhancement of photodestruction, the adsorption of SnUroP increases the destruction rate compared to that of the bare TiO₂ surface. The effect of ambient oxygen on the observed photolability of the Sn porphyrins and enhancement of photodestruction of SA was also investigated. SnTCPP does not photodecompose upon illumination either in the presence or absence of TiO₂, but neither does it bind to the photocatalyst at pH 6. At pH 4.5 it adsorbs onto TiO₂ but it also photodecompose at this pH. We are attempting to stabilize the adsorbed porphyrins by adding suitable peripheral substituents onto the porphyrin macrocycle. 27 refs., 6 figs.
Report Numbers
E 1.99:sand-91-2164c
E 1.99: conf-9109259--12
conf-9109259--12
sand-91-2164c
Subject(s)
Other Subject(s)
Note
Published through SciTech Connect.
01/01/1991.
"sand-91-2164c"
" conf-9109259--12"
"DE92002363"
1. international congress on environmentally conscious manufacturing, Santa Fe, NM (United States), 18 Sep 1991.
Shelnutt, J.A.; Prairie, M.R.; Majumder, S.A.; Ondrias, M.R.
Funding Information
AC04-76DP00789
View MARC record | catkey: 14396781