Removal of heavy metals from aqueous waste streams using surface-modified nanosized TiO{sub 2} photocatalysts.

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Titanium dioxide (TiO{sub 2}) colloidal particles ({approximately}45{angstrom}) whose surfaces were modified with chelating agents for photocatalytic removal of heavy-metal ions and their subsequent reduction to metallic form were investigated. Experiments were performed on nanoparticle TiO{sub 2} colloids derivatized with bidentate and tridentate ligands (thiolactic acid [TLA], cysteine, and alanine [ALA]) in batch mode in a photoreactor with 254nm light. We used catalysts designed and synthesized for selective and efficient removal of Pb and Cu with and without added hole scavenger (methanol). Parallel experiments also have been carried out in the dark to study metal ion adsorption properties. Solutions have been ... continued below

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14 p.

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Meshkov, N. K. August 27, 1998.

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Description

Titanium dioxide (TiO{sub 2}) colloidal particles ({approximately}45{angstrom}) whose surfaces were modified with chelating agents for photocatalytic removal of heavy-metal ions and their subsequent reduction to metallic form were investigated. Experiments were performed on nanoparticle TiO{sub 2} colloids derivatized with bidentate and tridentate ligands (thiolactic acid [TLA], cysteine, and alanine [ALA]) in batch mode in a photoreactor with 254nm light. We used catalysts designed and synthesized for selective and efficient removal of Pb and Cu with and without added hole scavenger (methanol). Parallel experiments also have been carried out in the dark to study metal ion adsorption properties. Solutions have been filtered to remove TiO{sub 2}, and metal particulates. Both the native solution and the metal deposited on the nanocrystalline TiO{sub 2} particles were analyzed. Results demonstrate that for the case of lead, the most effective TiO{sub 2} surface modifier was TLA (>99% Pb(II) removed from solution). Experiments performed to study Cn removal using TiO{sub 2} colloids modified with alanine showed that copper ions were effectively removed and reduced to metallic form in the presence of methanol.

Physical Description

14 p.

Notes

OSTI as DE00010918

Medium: P; Size: 14 pages

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  • 3rd International Conference on TiO{sub 2} Photocatalytic Purification and Treatment of Water and Air, Orlando, FL (US), 09/23/1997--09/26/1997

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  • Report No.: ANL/ES/CP-97012
  • Grant Number: W-31109-ENG-38
  • Office of Scientific & Technical Information Report Number: 10918
  • Archival Resource Key: ark:/67531/metadc619912

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  • August 27, 1998

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  • June 16, 2015, 7:43 a.m.

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  • April 7, 2017, 2:41 p.m.

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Meshkov, N. K. Removal of heavy metals from aqueous waste streams using surface-modified nanosized TiO{sub 2} photocatalysts., article, August 27, 1998; Illinois. (digital.library.unt.edu/ark:/67531/metadc619912/: accessed October 19, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.