Photocatalytic Properties of Tetraphenylporphyrins Immobilized on Calcium Alginate Aerogels.

Autor:	Solovieva AB; N.N.Semenov Institute of Chemical Physics, Department of Polymers and Composites, 4 Kosygin St., 119991, Moscow, Russia., Kopylov AS; N.N.Semenov Institute of Chemical Physics, Department of Polymers and Composites, 4 Kosygin St., 119991, Moscow, Russia., Savko MA; N.N.Semenov Institute of Chemical Physics, Department of Polymers and Composites, 4 Kosygin St., 119991, Moscow, Russia., Zarkhina TS; N.N.Semenov Institute of Chemical Physics, Department of Polymers and Composites, 4 Kosygin St., 119991, Moscow, Russia., Lovskaya DD; D.Mendeleev University of Chemical Technology of Russia, 9 Miusskaya Sq., 125047, Moscow, Russia., Lebedev AE; D.Mendeleev University of Chemical Technology of Russia, 9 Miusskaya Sq., 125047, Moscow, Russia., Menshutina NV; D.Mendeleev University of Chemical Technology of Russia, 9 Miusskaya Sq., 125047, Moscow, Russia., Krivandin AV; N.N.Semenov Institute of Chemical Physics, Department of Polymers and Composites, 4 Kosygin St., 119991, Moscow, Russia., Shershnev IV; N.N.Semenov Institute of Chemical Physics, Department of Polymers and Composites, 4 Kosygin St., 119991, Moscow, Russia., Kotova SL; N.N.Semenov Institute of Chemical Physics, Department of Polymers and Composites, 4 Kosygin St., 119991, Moscow, Russia. slkotova@mail.ru., Timashev PS; Institute for Regenerative Medicine, I. M. Sechenov First Moscow State Medical University, 8 Trubetskaya St., Moscow, 119991, Russia.; Institute of Photonic Technologies, Research center 'Crystallography and Photonics', 2 Pionerskaya St., Troitsk, Moscow, 142190, Russia.
Jazyk:	angličtina
Zdroj:	Scientific reports [Sci Rep] 2017 Oct 03; Vol. 7 (1), pp. 12640. Date of Electronic Publication: 2017 Oct 03.
DOI:	10.1038/s41598-017-12945-9
Abstrakt:	We have prepared photocatalytic systems based on tetraphenylporphyrins (TPP) immobilized on calcium alginate solid gels in the conditions of thermal drying on air (xerogel), freeze drying in vacuum (cryogel) and supercritical drying in the supercritical carbon dioxide (scCO 2 ) medium (aerogel). As a test reaction to measure the prepared systems' efficiency, we studied tryptophan photooxidation in the aqueous medium. We have demonstrated that the systems with aerogel as a carrier exhibited the highest photocatalytic efficiency. In that case, the rate constant for the test substrate (tryptophan) oxidation exceeds the corresponding rate constants of similar systems based on xerogel and cryogel by more than 5 times. Moreover, the aerogel-based photocatalytic systems demonstrated enhanced functional stability and a possibility of multiple use of such a catalyst in tryptophan oxidation. Based on the data of small-angle X-ray scattering and thermooxidative destruction, we have made a conclusion about the relationship between the high photocatalytic activity of aerogel-immobilized TPP and formation of a developed porous aerogel structure in the conditions of drying in the scCO 2 medium, which is stabilized due to formation of additional complex bonds of calcium ions with fragments of glycoside rings.
Databáze:	MEDLINE
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