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), Vol. 98:27; ISSN 0022-3654
• Country of Publication: United States
• Language: English

Related Subjects

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