TiO{sub 2}-mediated photodegradation of 3-chlorophenol in the presence of hydrogen peroxide

Conference · Sun Dec 31 04:00:00 EST 1995

OSTI ID:250911

Dong, C; Chen, C W; Wu, S S ^[1]

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1. National Kaohsiung Inst. of Marine Technology (Taiwan, Province of China). Dept. of Marine Environmental Engineering

Recently, there has been a great deal of attention on the use of photocatalytic oxidation process with TiO{sub 2} or other semiconductors in the field of hazardous waste treatment. A method involving acetylation followed by gas chromatography/mass spectrometric (GC/MS) analysis has been applied to the study of the reaction products and pathways of the TiO{sub 2}-mediated photocatalytic oxidation of 3-chlorophenol (3-CP) in the presence of hydrogen peroxide. Results indicate that the photocatalytic degradation of 3-CP produces 3-chlorocatechol (3-CCA) and 4-chlorocatechol (4-CCA), the ortho hydroxylated products, as the main products. This disagrees with what was reported by other researchers who have proposed the formation of para hydroxylated products, chlorohydroquinone (CHQ) as the major intermediate. In contrast, direct photolysis of 3-CP produces resorcinol (RES), the dechlorination products, as the main reaction products. A reaction pathway has been proposed to describe the degradation of 3-CP by TiO{sub 2}/H{sub 2}O{sub 2} oxidation process.

• OSTI ID: 250911
• Report Number(s): CONF-9507204--
• Country of Publication: United States
• Language: English

Related Subjects

54 ENVIRONMENTAL SCIENCES
CATALYTIC EFFECTS
CHLORINATED AROMATIC HYDROCARBONS
HAZARDOUS MATERIALS
PHOTOCHEMICAL REACTIONS
REMOVAL
TITANIUM OXIDES
WASTE PROCESSING