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Photooxidation of 2,4-dichlorophenoxyacetic acid by ferrous oxalate-mediated system.
Water Sci Technol. 2004; 49(4):117-22.WS

Abstract

The photodegradation of a herbicide 2,4-dichlorophenoxyacetic acid (2,4-D) by ferrous oxalate/UV/H2O2 was studied. Ferrous oxalate, the more photoactive and reactive species, was found to react faster with hydrogen peroxide for hydroxyl radical production than ferrous ions under UV irradiation. About 2.9 times greater rate enhancement was found with the addition of 0.3 mM oxalate than that of a solution containing 0.1 mM Fe2+ and 1 mM H2O2 in the presence of UV light at 253.7 nm. The kinetics dependence of hydrogen peroxide concentration and initial solution pH were also investigated. A threefold increase in peroxide concentration could accelerate the removal of 2,4-D and nearly complete the reaction in 30 min of illumination. The initial decay rate of 2,4-D treated by ferrous oxalate/UV/H2O2 accelerated from 0.0029 to 0.0034 s(-1) and the overall removal of the starting material increased from 78% to 99.9%. The 2,4-D transformation at lower initial pH had higher reaction rates than that at higher pH and different reaction mechanisms were identified. The efficiency of the herbicide decomposition was retarded 2.6 times and 9.6 times as initial pH increased from 2.8 to 5.1 and 9.0, respectively.

Authors+Show Affiliations

Department of Civil and Structural Engineering, The Hong Kong Polytechnic University, Hunghom, Kowloon, Hong Kong. joanna.kwan@polyu.edu.hkNo affiliation info available

Pub Type(s)

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

Language

eng

PubMed ID

15077958

Citation

Kwan, Y, and W Chu. "Photooxidation of 2,4-dichlorophenoxyacetic Acid By Ferrous Oxalate-mediated System." Water Science and Technology : a Journal of the International Association On Water Pollution Research, vol. 49, no. 4, 2004, pp. 117-22.
Kwan Y, Chu W. Photooxidation of 2,4-dichlorophenoxyacetic acid by ferrous oxalate-mediated system. Water Sci Technol. 2004;49(4):117-22.
Kwan, Y., & Chu, W. (2004). Photooxidation of 2,4-dichlorophenoxyacetic acid by ferrous oxalate-mediated system. Water Science and Technology : a Journal of the International Association On Water Pollution Research, 49(4), 117-22.
Kwan Y, Chu W. Photooxidation of 2,4-dichlorophenoxyacetic Acid By Ferrous Oxalate-mediated System. Water Sci Technol. 2004;49(4):117-22. PubMed PMID: 15077958.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Photooxidation of 2,4-dichlorophenoxyacetic acid by ferrous oxalate-mediated system. AU - Kwan,Y, AU - Chu,W, PY - 2004/4/14/pubmed PY - 2004/7/28/medline PY - 2004/4/14/entrez SP - 117 EP - 22 JF - Water science and technology : a journal of the International Association on Water Pollution Research JO - Water Sci Technol VL - 49 IS - 4 N2 - The photodegradation of a herbicide 2,4-dichlorophenoxyacetic acid (2,4-D) by ferrous oxalate/UV/H2O2 was studied. Ferrous oxalate, the more photoactive and reactive species, was found to react faster with hydrogen peroxide for hydroxyl radical production than ferrous ions under UV irradiation. About 2.9 times greater rate enhancement was found with the addition of 0.3 mM oxalate than that of a solution containing 0.1 mM Fe2+ and 1 mM H2O2 in the presence of UV light at 253.7 nm. The kinetics dependence of hydrogen peroxide concentration and initial solution pH were also investigated. A threefold increase in peroxide concentration could accelerate the removal of 2,4-D and nearly complete the reaction in 30 min of illumination. The initial decay rate of 2,4-D treated by ferrous oxalate/UV/H2O2 accelerated from 0.0029 to 0.0034 s(-1) and the overall removal of the starting material increased from 78% to 99.9%. The 2,4-D transformation at lower initial pH had higher reaction rates than that at higher pH and different reaction mechanisms were identified. The efficiency of the herbicide decomposition was retarded 2.6 times and 9.6 times as initial pH increased from 2.8 to 5.1 and 9.0, respectively. SN - 0273-1223 UR - https://www.unboundmedicine.com/medline/citation/15077958/Photooxidation_of_24_dichlorophenoxyacetic_acid_by_ferrous_oxalate_mediated_system_ DB - PRIME DP - Unbound Medicine ER -