Please use this identifier to cite or link to this item: https://scholarbank.nus.edu.sg/handle/10635/121989
Title: PHOTOCATALYTIC DETOXIFICATION AND REMOVAL OF TOXIC CR(VI) BY AMINE-FUNCTIONALIZED TIO2 PHOTOCATALYSTS
Authors: HE DA
Keywords: Photocatalytic reduction, Cr(VI) removal, Adsorption, Amine-functionalized, TiO2, Silane coupling agent
Issue Date: 19-Aug-2015
Citation: HE DA (2015-08-19). PHOTOCATALYTIC DETOXIFICATION AND REMOVAL OF TOXIC CR(VI) BY AMINE-FUNCTIONALIZED TIO2 PHOTOCATALYSTS. ScholarBank@NUS Repository.
Abstract: Cr(VI) is a generally existing pollutant in water, being highly toxic, carcinogenic, mutagenic, and teratogenic, which is traditionally treated by adsorption, chemical reduction, electrochemical reduction, ion-exchange and biological reduction. In this work, we applied novel photocatalytic reduction to remove Cr(VI). For efficiently reduce Cr(VI) to Cr(III) and remove both species simultaneously, TiO2 was functionalized with organic amines through silane coupling. Experimental results show that amine-functionalized TiO2-NH2 performs significantly better than original TiO2 in both photocatalytic activity and adsorption. Reduction rate was much faster at pH=3-5 and higher TiO2-NH2 dosage. Characterization results (FESEM, EDS, FTIR, TGA) confirm successful amine functionalization, which plays a key role in photocatalytic reduction & adsorption of Cr(VI) through coordination of N 2p electrons on amine to the empty 3d orbitals of chromium species. XRD and BET analysis reveal that higher crystallinity and surface area on TiO2-NH2 also contributes to Cr removal via chemisorption instead of physisorption.
URI: http://scholarbank.nus.edu.sg/handle/10635/121989
Appears in Collections:Master's Theses (Open)

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