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Photodegradation of bisphenol Z by UV irradiation in the presence of beta-cyclodextrin.
- Source :
-
Chemosphere [Chemosphere] 2007 Mar; Vol. 67 (4), pp. 762-9. Date of Electronic Publication: 2006 Nov 30. - Publication Year :
- 2007
-
Abstract
- In this work, the formation of the inclusion complex of bisphenol Z (1,1-bis(4-hydroxyphenyl)cyclohexane, abbreviated as BPCH) with beta-cyclodextrin (beta-CD) has been studied, 1:1 inclusion complex can be obtained, the formation constant of the beta-CD/BPCH complex is 5.94x10(3)M(-1). The photodegradation behavior of BPCH was investigated under monochromatic UV irradiation (lambda=254 nm). The photodegradation rate constant of BPCH in aqueous solutions with beta-CD showed a 9.0-fold increase, and simultaneously the mineralization of BPCH can be enhanced by beta-CD. The influence factors on photodegradation of BPCH were also studied and described in details, such as concentration of beta-CD, initial concentration of BPCH, organic solvent and pH. The photodegradation of BPCH in the presence of beta-CD includes the direct photolysis and the photooxidation of BPCH during the photochemical process. Some predominant photodegradation products are 4-(2,4,5-trihydroxy-phenyl)-4-(4-hydroxyphenyl) butanoic acid, 5,5-bis(4-hydroxyphenyl)pentanoic acid, meta-hydroxylated BPCH, ortho-hydroxylated BPCH and 4-(1-(4-hydroxyphenyl)pentyl)phenol respectively. The enhancement of photodegradation of BPCH mainly results from moderate inclusion depth of BPCH molecule in the beta-CD cavity. This kind of inclusion structure allows BPCH molecule sufficient proximity to secondary hydroxyl groups of the beta-CD cavity, and these hydroxyl groups could be activated and converted to hydroxyl radicals under UV irradiation, which can enhance the photooxidation of BPCH.
- Subjects :
- Acetonitriles
Benzhydryl Compounds
Chromatography, Liquid
Hydrogen-Ion Concentration
Kinetics
Mass Spectrometry
Solvents
Spectrometry, Fluorescence
Cyclohexanes chemistry
Cyclohexanes radiation effects
Endocrine Disruptors chemistry
Endocrine Disruptors radiation effects
Photolysis
Ultraviolet Rays
beta-Cyclodextrins chemistry
Subjects
Details
- Language :
- English
- ISSN :
- 0045-6535
- Volume :
- 67
- Issue :
- 4
- Database :
- MEDLINE
- Journal :
- Chemosphere
- Publication Type :
- Academic Journal
- Accession number :
- 17140625
- Full Text :
- https://doi.org/10.1016/j.chemosphere.2006.10.041