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EDTA Degradation Induced by Oxygen Activation in a Zerovalent Iron/Air/Water System
Abstract
A method for the removal of ethylenediaminetetraacetic acid (EDTA) at room temperature and 1 atm is demonstrated. EDTA (1 mM, 50 mL) containing 2.5 g of granular zerovalent iron (ZVI) (20-40 mesh) was degraded in 2.5 h. Using a recently developed form of O2 activation, reactive oxygen species are generated in situ, resulting in the degradation of EDTA when complexed with FeII. ESI-MS measurements indicate that degradation of EDTA yields low-molecular carboxylic acids. The presence of oxygen is crucial: the observed pseudo-first-order rate constants for EDTA removal are kobs = 1.02 h(-1) (kSA = 1.85 +/- 0.046 L h(-1) m(-2)) and kobs = 0.04 h(-1) (kSA = 0.00724 +/- 0.002 L h(-1) m(-2)) under air and under N2 purge, respectively. kSA represents surface area normalized rate constants. Large excesses of EDTA in the reaction mixture slowthe rate of degradation. Increasing the concentration of EDTA from 1.0 to 10.0 mM while holding all other parameters constant gave observed rates of kobs = 1.02 +/- 0.26 h(-1) (kSA = 1.85 +/- 0.046 L h(-1) m(-2)) and kobs = 0.044 +/- 0.01 h(-1) (kSA = 0.00796 +/- 0.002 L h(-1) m(-2)), respectively. The rate-limiting step is determined to be homogeneous oxygen activation.
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Citations
Cited by
Guan, X., Sun, Y., Qin, H., Li, J., Lo, I. M. C., He, D., & Dong, H. (2015) · Water Research · doi:10.1016/j.watres.2015.02.034 · Cited by 962
Xiao, S., Cheng, M., Zhong, H., Liu, Z., Liu, Y., Yang, X., & Liang, Q. (2020) · Chemical Engineering Journal · doi:10.1016/j.cej.2019.123265 · Cited by 954
Keenan, C. R., & Sedlak, D. L. (2008) · Environmental Science & Technology · doi:10.1021/es7025664 · Cited by 730
Li, H., Shang, J., Yang, Z., Shen, W., Ai, Z., & Zhang, L. (2017) · Environmental Science & Technology · doi:10.1021/acs.est.7b00040 · Cited by 538
Zhao, F., Repo, E., Yin, D., Meng, Y., Jafari, S., & Sillanpää, M. (2015) · Environmental Science & Technology · doi:10.1021/acs.est.5b02227 · Cited by 508
Metadata
- Authors
- Noradoun, C. E., & Cheng, I. F.
- Venue
- Environmental Science & Technology
- Publisher
- American Chemical Society (ACS)
- Published
- 2005-08-17
- Volume
- 39
- Issue
- 18
- Pages
- 7158-7163
- ISSN
- 0013-936X (ISSN-L)
- 1520-5851
- OpenAlex
- W2037014840
- Cited by
- 206
- References
- 0
- FWCI
- 5.54
- Type
- journal article
- Language
- en
- Open access
- closed
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- Noradoun, C. E., & Cheng, I. F. (2005). EDTA Degradation Induced by Oxygen Activation in a Zerovalent Iron/Air/Water System. Environmental Science & Technology. https://doi.org/10.1021/es050137v
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