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The role and fate of EDTA in ultrasound-enhanced zero-valent iron/air system.
Chemosphere. 2010 Jan; 78(5):576-82.C

Abstract

In this study, factors such as ZVI loading, ultrasound (US) input power, reaction temperature and solution pH that could affect the EDTA degradation in the US-enhanced zero-valent iron/air (US/ZVI/air) system were investigated. In the system, EDTA also served as an agent for complexation with the dissolved Fe(2+) and producing H(2)O(2) that would trigger Fenton-like reaction and degrade the EDTA itself. US played a threefold role in enhancing the overall EDTA degradation rate through: (1) accelerating ZVI corrosion and production of Fe(2+); (2) enhancing H(2)O(2) production through overcoming the kinetic barrier of oxygen activation by iron-EDTA complex; (3) improving EDTA mineralization while reducing its harmful by-products. The EDTA degradation rate with the US/ZVI/air system was 7.8 times higher than the combined rates achieved with US/air and ZVI/air operated as individual systems, indicating a significant synergistic effect. A hypothetical scheme illustrating the role and fate of EDTA in the US/ZVI/air system is proposed, indicating a complex auto-oxidation process enhanced by the US. It is postulated that ferryl-EDTA complex ([Fe(IV)O]EDTA) rather than OH was the dominant oxidant generated in the US/ZVI/air system that oxidized the EDTA even under the circumneutral condition.

Authors+Show Affiliations

Nanyang Technological University, Singapore, Republic of Singapore. tzhou@ntu.edu.sgNo affiliation info availableNo affiliation info availableNo affiliation info availableNo affiliation info available

Pub Type(s)

Journal Article

Language

eng

PubMed ID

19939434

Citation

Zhou, Tao, et al. "The Role and Fate of EDTA in Ultrasound-enhanced Zero-valent Iron/air System." Chemosphere, vol. 78, no. 5, 2010, pp. 576-82.
Zhou T, Lim TT, Li Y, et al. The role and fate of EDTA in ultrasound-enhanced zero-valent iron/air system. Chemosphere. 2010;78(5):576-82.
Zhou, T., Lim, T. T., Li, Y., Lu, X., & Wong, F. S. (2010). The role and fate of EDTA in ultrasound-enhanced zero-valent iron/air system. Chemosphere, 78(5), 576-82. https://doi.org/10.1016/j.chemosphere.2009.10.057
Zhou T, et al. The Role and Fate of EDTA in Ultrasound-enhanced Zero-valent Iron/air System. Chemosphere. 2010;78(5):576-82. PubMed PMID: 19939434.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - The role and fate of EDTA in ultrasound-enhanced zero-valent iron/air system. AU - Zhou,Tao, AU - Lim,Teik-Thye, AU - Li,Yaozhong, AU - Lu,Xiaohua, AU - Wong,Fook-Sin, Y1 - 2009/11/24/ PY - 2009/09/01/received PY - 2009/10/24/revised PY - 2009/10/26/accepted PY - 2009/11/27/entrez PY - 2009/11/27/pubmed PY - 2010/4/10/medline SP - 576 EP - 82 JF - Chemosphere JO - Chemosphere VL - 78 IS - 5 N2 - In this study, factors such as ZVI loading, ultrasound (US) input power, reaction temperature and solution pH that could affect the EDTA degradation in the US-enhanced zero-valent iron/air (US/ZVI/air) system were investigated. In the system, EDTA also served as an agent for complexation with the dissolved Fe(2+) and producing H(2)O(2) that would trigger Fenton-like reaction and degrade the EDTA itself. US played a threefold role in enhancing the overall EDTA degradation rate through: (1) accelerating ZVI corrosion and production of Fe(2+); (2) enhancing H(2)O(2) production through overcoming the kinetic barrier of oxygen activation by iron-EDTA complex; (3) improving EDTA mineralization while reducing its harmful by-products. The EDTA degradation rate with the US/ZVI/air system was 7.8 times higher than the combined rates achieved with US/air and ZVI/air operated as individual systems, indicating a significant synergistic effect. A hypothetical scheme illustrating the role and fate of EDTA in the US/ZVI/air system is proposed, indicating a complex auto-oxidation process enhanced by the US. It is postulated that ferryl-EDTA complex ([Fe(IV)O]EDTA) rather than OH was the dominant oxidant generated in the US/ZVI/air system that oxidized the EDTA even under the circumneutral condition. SN - 1879-1298 UR - https://www.unboundmedicine.com/medline/citation/19939434/The_role_and_fate_of_EDTA_in_ultrasound_enhanced_zero_valent_iron/air_system_ L2 - https://linkinghub.elsevier.com/retrieve/pii/S0045-6535(09)01283-1 DB - PRIME DP - Unbound Medicine ER -