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Reaction pathways of dimethyl phthalate degradation in TiO2-UV-O2 and TiO2-UV-Fe(VI) systems.
Chemosphere. 2008 May; 72(2):197-204.C

Abstract

The photocatalytic degradation of dimethyl phthalate (DMP) in aqueous TiO2 suspension under UV illumination has been investigated using oxygen (O2) and ferrate (Fe(VI)) as electron acceptors. The experiments demonstrated that Fe(VI) was a more effective electron acceptor than O2 for scavenging the conduction band electrons from the surface of the catalyst. Some major intermediate products from DMP degradation were identified by HPLC and GC/MS analyses. The analytical results identified dimethyl 3-hydroxyphthalate and dimethyl 2-hydroxyphthalate as the two main intermediate products from the DMP degradation in the TiO2-UV-O2 system, while in contrast phthalic acid was found to be the main intermediate product in the TiO2-UV-Fe(VI) system. These findings indicate that DMP degradation in the TiO2-UV-O2 and TiO2-UV-Fe(VI) systems followed different reaction pathways. An electron spin resonance analysis confirmed that hydroxyl radicals existed in the TiO2-UV-O2 reaction system and an unknown radical species (most likely an iron-oxo species) is suspected to exist in the TiO2-UV-Fe(VI) reaction system. Two pathway schemes of DMP degradation in the TiO2-UV-O2 and TiO2-UV-Fe(VI) reaction systems are proposed. It is believed that the radicals formed in the TiO2-UV-O2 reaction system preferably attack the aromatic ring of the DMP, while in contrast the radicals formed in the TiO2-UV-Fe(VI) reaction systems attack the alkyl chain of DMP.

Authors+Show Affiliations

Department of Civil and Structural Engineering, The Hong Kong Polytechnic University, Hong Kong, China.No affiliation info availableNo affiliation info available

Pub Type(s)

Journal Article
Research Support, Non-U.S. Gov't

Language

eng

PubMed ID

18342912

Citation

Yuan, Bao-ling, et al. "Reaction Pathways of Dimethyl Phthalate Degradation in TiO2-UV-O2 and TiO2-UV-Fe(VI) Systems." Chemosphere, vol. 72, no. 2, 2008, pp. 197-204.
Yuan BL, Li XZ, Graham N. Reaction pathways of dimethyl phthalate degradation in TiO2-UV-O2 and TiO2-UV-Fe(VI) systems. Chemosphere. 2008;72(2):197-204.
Yuan, B. L., Li, X. Z., & Graham, N. (2008). Reaction pathways of dimethyl phthalate degradation in TiO2-UV-O2 and TiO2-UV-Fe(VI) systems. Chemosphere, 72(2), 197-204. https://doi.org/10.1016/j.chemosphere.2008.01.055
Yuan BL, Li XZ, Graham N. Reaction Pathways of Dimethyl Phthalate Degradation in TiO2-UV-O2 and TiO2-UV-Fe(VI) Systems. Chemosphere. 2008;72(2):197-204. PubMed PMID: 18342912.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Reaction pathways of dimethyl phthalate degradation in TiO2-UV-O2 and TiO2-UV-Fe(VI) systems. AU - Yuan,Bao-ling, AU - Li,Xiang-zhong, AU - Graham,Nigel, Y1 - 2008/03/14/ PY - 2007/11/15/received PY - 2008/01/28/revised PY - 2008/01/28/accepted PY - 2008/3/18/pubmed PY - 2008/9/23/medline PY - 2008/3/18/entrez SP - 197 EP - 204 JF - Chemosphere JO - Chemosphere VL - 72 IS - 2 N2 - The photocatalytic degradation of dimethyl phthalate (DMP) in aqueous TiO2 suspension under UV illumination has been investigated using oxygen (O2) and ferrate (Fe(VI)) as electron acceptors. The experiments demonstrated that Fe(VI) was a more effective electron acceptor than O2 for scavenging the conduction band electrons from the surface of the catalyst. Some major intermediate products from DMP degradation were identified by HPLC and GC/MS analyses. The analytical results identified dimethyl 3-hydroxyphthalate and dimethyl 2-hydroxyphthalate as the two main intermediate products from the DMP degradation in the TiO2-UV-O2 system, while in contrast phthalic acid was found to be the main intermediate product in the TiO2-UV-Fe(VI) system. These findings indicate that DMP degradation in the TiO2-UV-O2 and TiO2-UV-Fe(VI) systems followed different reaction pathways. An electron spin resonance analysis confirmed that hydroxyl radicals existed in the TiO2-UV-O2 reaction system and an unknown radical species (most likely an iron-oxo species) is suspected to exist in the TiO2-UV-Fe(VI) reaction system. Two pathway schemes of DMP degradation in the TiO2-UV-O2 and TiO2-UV-Fe(VI) reaction systems are proposed. It is believed that the radicals formed in the TiO2-UV-O2 reaction system preferably attack the aromatic ring of the DMP, while in contrast the radicals formed in the TiO2-UV-Fe(VI) reaction systems attack the alkyl chain of DMP. SN - 0045-6535 UR - https://www.unboundmedicine.com/medline/citation/18342912/Reaction_pathways_of_dimethyl_phthalate_degradation_in_TiO2_UV_O2_and_TiO2_UV_Fe_VI__systems_ L2 - https://linkinghub.elsevier.com/retrieve/pii/S0045-6535(08)00130-6 DB - PRIME DP - Unbound Medicine ER -