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Comparison of the degradations of diphenamid by homogeneous photolysis and heterogeneous photocatalysis in aqueous solution.
Chemosphere. 2010 Jun; 80(4):366-74.C

Abstract

In this work, the homogeneous and heterogeneous degradations of diphenamid (DPA) in aqueous solution were conducted by direct photolysis with UVC (254nm) and by photocatalysis with TiO(2)/UVA (350nm), and the experimental results were compared. It was found that the homogeneous photolysis by UVC irradiation alone was quite efficient to degrade DPA up to 100% after 360min, but was very inefficient to mineralize its intermediates in terms of dissolved organic carbon reduction of only 8%. In contrast, the heterogeneous photocatalysis with TiO(2)/UVA showed relatively a lower degree of DPA degradation (51%), but a higher degree of its mineralization (11%) after 360min. These results reveal that the photocatalysis process has relatively poor selectivity to degrade different compounds including various intermediates from the DPA degradation, which is beneficial to its mineralization. In addition, over 20 intermediates were identified by LC-MS and (1)H NMR analyses. Based on the identified intermediates, the reaction mechanisms and the detailed pathways of the DPA degradation by photolysis and photocatalysis were proposed, and are presented in this paper.

Authors+Show Affiliations

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

Pub Type(s)

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

Language

eng

PubMed ID

20494398

Citation

Liang, Hai-chao, et al. "Comparison of the Degradations of Diphenamid By Homogeneous Photolysis and Heterogeneous Photocatalysis in Aqueous Solution." Chemosphere, vol. 80, no. 4, 2010, pp. 366-74.
Liang HC, Li XZ, Yang YH, et al. Comparison of the degradations of diphenamid by homogeneous photolysis and heterogeneous photocatalysis in aqueous solution. Chemosphere. 2010;80(4):366-74.
Liang, H. C., Li, X. Z., Yang, Y. H., & Sze, K. H. (2010). Comparison of the degradations of diphenamid by homogeneous photolysis and heterogeneous photocatalysis in aqueous solution. Chemosphere, 80(4), 366-74. https://doi.org/10.1016/j.chemosphere.2010.04.054
Liang HC, et al. Comparison of the Degradations of Diphenamid By Homogeneous Photolysis and Heterogeneous Photocatalysis in Aqueous Solution. Chemosphere. 2010;80(4):366-74. PubMed PMID: 20494398.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Comparison of the degradations of diphenamid by homogeneous photolysis and heterogeneous photocatalysis in aqueous solution. AU - Liang,Hai-chao, AU - Li,Xiang-zhong, AU - Yang,Yin-hua, AU - Sze,Kong-hung, Y1 - 2010/05/21/ PY - 2010/01/02/received PY - 2010/04/22/revised PY - 2010/04/22/accepted PY - 2010/5/25/entrez PY - 2010/5/25/pubmed PY - 2010/9/11/medline SP - 366 EP - 74 JF - Chemosphere JO - Chemosphere VL - 80 IS - 4 N2 - In this work, the homogeneous and heterogeneous degradations of diphenamid (DPA) in aqueous solution were conducted by direct photolysis with UVC (254nm) and by photocatalysis with TiO(2)/UVA (350nm), and the experimental results were compared. It was found that the homogeneous photolysis by UVC irradiation alone was quite efficient to degrade DPA up to 100% after 360min, but was very inefficient to mineralize its intermediates in terms of dissolved organic carbon reduction of only 8%. In contrast, the heterogeneous photocatalysis with TiO(2)/UVA showed relatively a lower degree of DPA degradation (51%), but a higher degree of its mineralization (11%) after 360min. These results reveal that the photocatalysis process has relatively poor selectivity to degrade different compounds including various intermediates from the DPA degradation, which is beneficial to its mineralization. In addition, over 20 intermediates were identified by LC-MS and (1)H NMR analyses. Based on the identified intermediates, the reaction mechanisms and the detailed pathways of the DPA degradation by photolysis and photocatalysis were proposed, and are presented in this paper. SN - 1879-1298 UR - https://www.unboundmedicine.com/medline/citation/20494398/Comparison_of_the_degradations_of_diphenamid_by_homogeneous_photolysis_and_heterogeneous_photocatalysis_in_aqueous_solution_ L2 - https://linkinghub.elsevier.com/retrieve/pii/S0045-6535(10)00502-3 DB - PRIME DP - Unbound Medicine ER -