|About this Abstract
||Materials Science & Technology 2019
||Controlled Synthesis, Processing, and Applications of Structural and Functional Nanomaterials
||Nanocomposites TiO2-layered Hydroxides. Structure and Photocatalytic Decomposition of Vanillin and Methyl Orange
||Andrei Jitianu, Thomas Haughey, Naphtali O'Connor, Edruce Edouarzin, Mihaela Jitianu
|On-Site Speaker (Planned)
Various organic compounds can be decomposed in aqueous solution by titanium dioxide (TiO2) under near ultraviolet light into carbon dioxide and water. When TiO2 absorbs ultraviolet radiation, it produces pairs of electrons and holes. The key for an ongoing photooxidation process is avoiding accumulation of the electrons on particles that ultimately leads to recombination with the holes by creating nanocomposites with lamellar mixed hydroxides. Those layered hydroxides have the general formula [Mg(II)1-xAl(III)x(OH)2]x+(Ax/m)m-nH2O, where Am- is a compensating anion. The sol-gel process was employed to synthesize the TiO2¬-based nanocomposites. TiO2 precursor was Titanium (IV) isopropoxide, whereas the mixed hydroxides were generated in situ from the corresponding nitrates, using urea. The photocatalytic test reactions were performed under visible light (575 nm), using molecules with two different structures, vanillin and methyl-orange. The nanosized composites photocatalytic properties were correlated with specific structural features of the organic compounds investigated.
||Definite: At-meeting proceedings