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UVA-LED-Assisted Activation of the Ferrate(VI) Process for Enhanced Micropollutant Degradation: Important Role of Ferrate(IV) and Ferrate(V).
Environ Sci Technol. 2022 01 18; 56(2):1221-1232.ES

Abstract

This paper investigated ultraviolet A light-emitting diode (UVA-LED) irradiation to activate Fe(VI) for the degradation of micropollutants (e.g., sulfamethoxazole (SMX), enrofloxacin, and trimethoprim). UVA-LED/Fe(VI) could significantly promote the degradation of micropollutants, with rates that were 2.6-7.2-fold faster than for Fe(VI) alone. Comparatively, UVA-LED alone hardly degraded selected micropollutants. The degradation performance was further evaluated in SMX degradation via different wavelengths (365-405 nm), light intensity, and pH. Increased wavelengths led to linearly decreased SMX degradation rates because Fe(VI) has a lower molar absorption coefficient at higher wavelengths. Higher light intensity caused faster SMX degradation, owing to the enhanced level of reactive species by stronger photolysis of Fe(VI). Significantly, SMX degradation was gradually suppressed from pH 7.0 to 9.0 due to the changing speciation of Fe(VI). Scavenging and probing experiments for identifying oxidative species indicated that high-valent iron species (Fe(V)/Fe(IV)) were responsible for the enhanced degradation. A kinetic model involving target compound (TC) degradation by Fe(VI), Fe(V), and Fe(IV) was employed to fit the TC degradation kinetics by UVA-LED/Fe(VI). The fitted results revealed that Fe(IV) and Fe(V) primarily contributed to TC degradation in this system. In addition, transformation products of SMX degradation by Fe(VI) and UVA-LED/Fe(VI) were identified and the possible pathways included hydroxylation, self-coupling, bond cleavage, and oxidation reactions. Removal of SMX in real water also showed remarkable promotion by UVA-LED/Fe(VI). Overall, these findings could shed light on the understanding and application of UVA-LED/Fe(VI) for eliminating micropollutants in water treatments.

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Publisher Full Text (DOI)

Authors+Show Affiliations

School of Biotechnology and Health Science, Wuyi University, Jiangmen 529020, Guangdong Province, China.

School of Biotechnology and Health Science, Wuyi University, Jiangmen 529020, Guangdong Province, China.

State Key Laboratory of Urban Water Resource and Environment, School of Municipal and Environmental Engineering, Harbin Institute of Technology, Harbin 150090, China.

School of Biotechnology and Health Science, Wuyi University, Jiangmen 529020, Guangdong Province, China.

School of Biotechnology and Health Science, Wuyi University, Jiangmen 529020, Guangdong Province, China.

School of Biotechnology and Health Science, Wuyi University, Jiangmen 529020, Guangdong Province, China.

School of Applied and Physics Materials, Wuyi University, Jiangmen 529020, Guangdong Province, China.

School of Biotechnology and Health Science, Wuyi University, Jiangmen 529020, Guangdong Province, China.

State Key Laboratory of Urban Water Resource and Environment, School of Municipal and Environmental Engineering, Harbin Institute of Technology, Harbin 150090, China.

MeSH

IronKineticsOxidation-ReductionSulfamethoxazoleWater Pollutants, ChemicalWater Purification

Pub Type(s)

Journal Article

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

Language

eng

PubMed ID

34961311

Citation

Yang, Tao, et al. "UVA-LED-Assisted Activation of the Ferrate(VI) Process for Enhanced Micropollutant Degradation: Important Role of Ferrate(IV) and Ferrate(V)." Environmental Science & Technology, vol. 56, no. 2, 2022, pp. 1221-1232.

Yang T, Mai J, Cheng H, et al. UVA-LED-Assisted Activation of the Ferrate(VI) Process for Enhanced Micropollutant Degradation: Important Role of Ferrate(IV) and Ferrate(V). Environ Sci Technol. 2022;56(2):1221-1232.

Yang, T., Mai, J., Cheng, H., Zhu, M., Wu, S., Tang, L., Liang, P., Jia, J., & Ma, J. (2022). UVA-LED-Assisted Activation of the Ferrate(VI) Process for Enhanced Micropollutant Degradation: Important Role of Ferrate(IV) and Ferrate(V). Environmental Science & Technology, 56(2), 1221-1232. https://doi.org/10.1021/acs.est.1c03725

Yang T, et al. UVA-LED-Assisted Activation of the Ferrate(VI) Process for Enhanced Micropollutant Degradation: Important Role of Ferrate(IV) and Ferrate(V). Environ Sci Technol. 2022 01 18;56(2):1221-1232. PubMed PMID: 34961311.

* Article titles in AMA citation format should be in sentence-case

TY - JOUR T1 - UVA-LED-Assisted Activation of the Ferrate(VI) Process for Enhanced Micropollutant Degradation: Important Role of Ferrate(IV) and Ferrate(V). AU - Yang,Tao, AU - Mai,Jiamin, AU - Cheng,Haijun, AU - Zhu,Mengyang, AU - Wu,Sisi, AU - Tang,Liuyan, AU - Liang,Ping, AU - Jia,Jianbo, AU - Ma,Jun, Y1 - 2021/12/27/ PY - 2021/12/29/pubmed PY - 2022/4/1/medline PY - 2021/12/28/entrez KW - UVA-LED KW - degradation mechanism KW - ferrate KW - kinetic model KW - micropollutants SP - 1221 EP - 1232 JF - Environmental science & technology JO - Environ Sci Technol VL - 56 IS - 2 N2 - This paper investigated ultraviolet A light-emitting diode (UVA-LED) irradiation to activate Fe(VI) for the degradation of micropollutants (e.g., sulfamethoxazole (SMX), enrofloxacin, and trimethoprim). UVA-LED/Fe(VI) could significantly promote the degradation of micropollutants, with rates that were 2.6-7.2-fold faster than for Fe(VI) alone. Comparatively, UVA-LED alone hardly degraded selected micropollutants. The degradation performance was further evaluated in SMX degradation via different wavelengths (365-405 nm), light intensity, and pH. Increased wavelengths led to linearly decreased SMX degradation rates because Fe(VI) has a lower molar absorption coefficient at higher wavelengths. Higher light intensity caused faster SMX degradation, owing to the enhanced level of reactive species by stronger photolysis of Fe(VI). Significantly, SMX degradation was gradually suppressed from pH 7.0 to 9.0 due to the changing speciation of Fe(VI). Scavenging and probing experiments for identifying oxidative species indicated that high-valent iron species (Fe(V)/Fe(IV)) were responsible for the enhanced degradation. A kinetic model involving target compound (TC) degradation by Fe(VI), Fe(V), and Fe(IV) was employed to fit the TC degradation kinetics by UVA-LED/Fe(VI). The fitted results revealed that Fe(IV) and Fe(V) primarily contributed to TC degradation in this system. In addition, transformation products of SMX degradation by Fe(VI) and UVA-LED/Fe(VI) were identified and the possible pathways included hydroxylation, self-coupling, bond cleavage, and oxidation reactions. Removal of SMX in real water also showed remarkable promotion by UVA-LED/Fe(VI). Overall, these findings could shed light on the understanding and application of UVA-LED/Fe(VI) for eliminating micropollutants in water treatments. SN - 1520-5851 UR - https://www.unboundmedicine.com/medline/citation/34961311/UVA_LED_Assisted_Activation_of_the_Ferrate_VI__Process_for_Enhanced_Micropollutant_Degradation:_Important_Role_of_Ferrate_IV__and_Ferrate_V__ DB - PRIME DP - Unbound Medicine ER -