Combined photooxidation/photoreduction using TiO{sub 2} photocatalysts to treat organic/inorganic metal-laden wastewaters

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Titanium dioxide (TiO{sub 2}) colloids prepared from titanium chloride (TiCl{sub 4}) were used as photocatalysts in the experiments. Cysteine was selected as the model derivative for the surface modification of the TiO{sub 2} nanoparticles. Testing of TiO{sub 2} photocatalysts conducted in the absence of organic compounds demonstrated that adsorption of lead ions occurred in the system with either untreated (virgin) or treated (modified using cysteine) TiO{sub 2} photocatalysts. Adsorption rates of the metal ions in the systems that used treated TiO{sub 2} photocatalysts were about three times faster than those where untreated TiO{sub 2} photocatalysts were used. Lead ion concentrations ... continued below

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13 p.

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Peters, R.W.; Wu, J.M.; Meshkov, N.; Thurnauer, M.C.; Ostafin, A.E. & Rajh, T. March 1, 1995.

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Description

Titanium dioxide (TiO{sub 2}) colloids prepared from titanium chloride (TiCl{sub 4}) were used as photocatalysts in the experiments. Cysteine was selected as the model derivative for the surface modification of the TiO{sub 2} nanoparticles. Testing of TiO{sub 2} photocatalysts conducted in the absence of organic compounds demonstrated that adsorption of lead ions occurred in the system with either untreated (virgin) or treated (modified using cysteine) TiO{sub 2} photocatalysts. Adsorption rates of the metal ions in the systems that used treated TiO{sub 2} photocatalysts were about three times faster than those where untreated TiO{sub 2} photocatalysts were used. Lead ion concentrations in the irradiated solutions decreased as the UV irradiation time increased; greater metal removals were achieved at longer irradiation times. The rate of decreasing lead ion concentrations in the system that used treated TiO{sub 2} photocatalysts was about two to three times faster than that in the system using untreated TiO{sub 2} photocatalysts. Experiments were also performed in which organic compounds (naphthalene or phenol) and heavy metals (Pb{sup 2+}) were simultaneously treated with TiO{sub 2} photocatalysts. The presence of lead ions did not interfere with the photo-degradation of the selected organic compounds from solution. The presence of phenol compound appeared not to affect the photoreduction of lead ions, while addition of naphthalene compound resulted in a lag-time effect on the photoreduction of lead ions from solution. All of the experimental results showed that the cysteine-modified TiO{sub 2} resulted in faster and more effective removal than that for the untreated TiO{sub 2} system. This technique has resulted in the simultaneous photocatalytic removal/recovery of organic and inorganic compounds in the system.

Physical Description

13 p.

Notes

OSTI as DE95008268

Source

  • Waste management `95, Tucson, AZ (United States), 26 Feb - 2 Mar 1995

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  • Other: DE95008268
  • Report No.: ANL/ES/CP--85677
  • Report No.: CONF-950216--61
  • Grant Number: W-31109-ENG-38
  • DOI: 10.2172/28268 | External Link
  • Office of Scientific & Technical Information Report Number: 28268
  • Archival Resource Key: ark:/67531/metadc673244

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  • March 1, 1995

Added to The UNT Digital Library

  • June 29, 2015, 9:42 p.m.

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  • Dec. 14, 2015, 6:20 p.m.

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Peters, R.W.; Wu, J.M.; Meshkov, N.; Thurnauer, M.C.; Ostafin, A.E. & Rajh, T. Combined photooxidation/photoreduction using TiO{sub 2} photocatalysts to treat organic/inorganic metal-laden wastewaters, report, March 1, 1995; Illinois. (digital.library.unt.edu/ark:/67531/metadc673244/: accessed December 18, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.