HOMEPRODUCTSCOMPANYCONTACTFAQResearchDictionaryPharmaSign Up FREE or Login

Superior photodecomposition of pyrene by metal ion-loaded TiO₂ catalyst under UV light irradiation.

AbstractBACKGROUND:
The photocatalytic degradation of pyrene under UV (125 W Hg-Arc, 10.4 mW/cm2) irradiation of TiO2 aqueous suspension has been found to be highly improved with the dissolved transition metal ions like Cu2+, Fe3+, Ag+, and Au3+, etc. As the reduction potential of these metals lies below the conduction band (CB) position (−0.1 eV) of TiO2, the photoexcited electron transfer occurs more readily and reduces electron–hole recombination rate. Therefore, it has a beneficial influence on the photocatalytic ability of TiO2 because of rapid Fermi energy equilibrium between the CB of TiO2 and its surface adsorbed metal ions.
RESULTS AND DISCUSSION:
The Fermi level is referred to as the electrochemical potential and plays an important role in the band theory of solids. When metal and semiconductor are in contact, electron migration from photoirradiated semiconductor to the deposited metal occurs at the interface until two Fermi levels equilibrate and enhanced the photocatalytic activity of semiconductor photocatalyst. Ni2+ having more negative reduction potential (−0.25 eV) than the CB of TiO2 imparts negligible co-catalytic activity to TiO2 photoreaction. It also revealed that loading of Au3+ ions displayed higher degradation rate of pyrene than Au photodeposition. Furthermore, when the amount of dissolved Fe+3 and Au3+ ions gradually increases from 0.1 to 2 wt.%, the pyrene photodecomposition rate also become faster.
AuthorsMalka Rani, Nidhi Gupta, Bonamali Pal
JournalEnvironmental science and pollution research international (Environ Sci Pollut Res Int) Vol. 19 Issue 6 Pg. 2305-15 (Jul 2012) ISSN: 1614-7499 [Electronic] Germany
PMID22314347 (Publication Type: Journal Article)
Chemical References
  • Metals
  • Pyrenes
  • Water Pollutants, Chemical
  • titanium dioxide
  • Silver
  • Gold
  • Copper
  • pyrene
  • Titanium
  • Iron
Topics
  • Catalysis (radiation effects)
  • Copper (chemistry)
  • Gold (chemistry)
  • Iron (chemistry)
  • Metals (chemistry)
  • Photolysis (drug effects)
  • Pyrenes (chemistry)
  • Silver (chemistry)
  • Titanium (chemistry)
  • Ultraviolet Rays
  • Water Pollutants, Chemical (chemistry)

Join CureHunter, for free Research Interface BASIC access!

Take advantage of free CureHunter research engine access to explore the best drug and treatment options for any disease. Find out why thousands of doctors, pharma researchers and patient activists around the world use CureHunter every day.
Realize the full power of the drug-disease research graph!


Choose Username:
Email:
Password:
Verify Password:
Enter Code Shown: