Electrochemically assisted photocatalysis. 2. The role of oxygen and reaction intermediates in the degradation of 4-chlorophenol on immobilized TiO[sub 2] particulate films

Journal Article · Thu Jul 07 00:00:00 EDT 1994 · Journal of Physical Chemistry; (United States)

DOI:https://doi.org/10.1021/j100078a023· OSTI ID:7101842

Vinodgopal, K ^[1]; Stafford, U; Gray, K A; Kamat, P V ^[2]

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1. Indiana Univ. Northwest, Gary, IN (United States)
2. Univ. of Notre Dame, IN (United States)

The electrochemically-assisted photocatalytic degradation of 4-chlorophenol (4-CP) using immobilized TiO[sub 2] particulate films has been investigated by analyzing reaction intermediates under a variety of experimental conditions. The degradations were carried out in both nitrogen- and oxygen-saturated solutions to explore the role of reduced oxygen species and molecular oxygen in the formation of reaction intermediates and in the mineralization of 4-CP. The degradation rate can be greatly improved even in a nitrogen-saturated atmosphere by applying an anodic bias to the TiO[sub 2] film electrodes. 4-Chlorocatechol (4-CC) is the predominant intermediate observed in oxygen-saturated solutions, whereas hydroquinone (HQ) is the primary intermediate in nitrogen-saturated solutions. Molecular oxygen plays an important role in the enhancement of the electrochemically assisted photocatalytic decay rate of 4-CP and the subsequent degradation of reaction intermediates, viz., 4-CC and HQ. 37 refs., 7 figs., 1 tab.

• OSTI ID: 7101842
• Journal Information: Journal of Physical Chemistry; (United States), Journal Name: Journal of Physical Chemistry; (United States) Vol. 98:27; ISSN JPCHAX; ISSN 0022-3654
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360606 -- Other Materials-- Physical Properties-- (1992-)
37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400201 -- Chemical & Physicochemical Properties
400400 -- Electrochemistry
400500* -- Photochemistry
AROMATICS
CATALYSIS
CHALCOGENIDES
CHEMICAL REACTIONS
CHEMISTRY
DECOMPOSITION
ELECTROCHEMISTRY
ELECTROLYSIS
ELECTROMAGNETIC RADIATION
ELEMENTS
FILMS
HYDROXY COMPOUNDS
LYSIS
MINERALIZATION
NITROGEN
NONMETALS
ORGANIC CHLORINE COMPOUNDS
ORGANIC COMPOUNDS
ORGANIC HALOGEN COMPOUNDS
OXIDATION
OXIDES
OXYGEN
OXYGEN COMPOUNDS
PARTICLES
PARTICULATES
PHENOLS
PHOTOCHEMICAL REACTIONS
RADIATIONS
RADICALS
REACTION INTERMEDIATES
TITANIUM COMPOUNDS
TITANIUM OXIDES
TRANSITION ELEMENT COMPOUNDS
ULTRAVIOLET RADIATION