Hydroxyl radical scavenging factor measurement using a fluorescence excitation-emission matrix and parallel factor analysis in ultraviolet advanced oxidation processes.

Autor: Hwang TM; Korea Institute of Civil Engineering and Building Technology, 283 Goyangdar-Ro, Ilsan-Gu, Goyang-Si, Gyeonggi-Do, 411-712, Republic of Korea; Korea University of Science & Technology, 217 Gajung-ro Yuseong-gu, Daejeon, 305-333, Republic of Korea. Electronic address: taemun@kict.re.kr., Nam SH; Korea Institute of Civil Engineering and Building Technology, 283 Goyangdar-Ro, Ilsan-Gu, Goyang-Si, Gyeonggi-Do, 411-712, Republic of Korea., Lee J; Korea Institute of Civil Engineering and Building Technology, 283 Goyangdar-Ro, Ilsan-Gu, Goyang-Si, Gyeonggi-Do, 411-712, Republic of Korea; Korea University of Science & Technology, 217 Gajung-ro Yuseong-gu, Daejeon, 305-333, Republic of Korea., Koo JW; Korea Institute of Civil Engineering and Building Technology, 283 Goyangdar-Ro, Ilsan-Gu, Goyang-Si, Gyeonggi-Do, 411-712, Republic of Korea., Kim E; Korea Institute of Civil Engineering and Building Technology, 283 Goyangdar-Ro, Ilsan-Gu, Goyang-Si, Gyeonggi-Do, 411-712, Republic of Korea., Kwon M; Department of Environmental Engineering (YIEST), Yonsei University, Republic of Korea.
Jazyk: angličtina
Zdroj: Chemosphere [Chemosphere] 2020 Nov; Vol. 259, pp. 127396. Date of Electronic Publication: 2020 Jun 22.
DOI: 10.1016/j.chemosphere.2020.127396
Abstrakt: The performance of the UV/H 2 O 2 advanced oxidation process (AOP) is dependent on water quality parameters, including the UV absorbance coefficient at 254 nm and hydroxyl radical (•OH) water background demand (scavenging factor, s -1 ). The •OH scavenging factor represents the •OH scavenging rate of the background substances in the water matrix, and it is known to be one of the key parameters to predict the performance of the UV/H 2 O 2 process. The •OH scavenging factor has been determined experimentally by using a probe compound such as pCBA and rhodamine B. The experimental method has been validated to accurately predict the micropollutants removal in the UV/H 2 O 2 process, but there is a need for an easier and simple method of determining the OH scavenging factor. We evaluated the alternative method to analyze the •OH scavenging factor using fluorescence excitation-emission matrix and parallel factor analysis (F-EEM/PARAFAC). The correlation between •OH scavenging factor and the spectroscopic characteristics and structure of different organic matter types was evaluated. Organic matter was characterized using a fluorescence excitation-emission matrix, parallel factor analysis, and liquid chromatography-organic carbon detection. Second-order reaction rates of humic acid sodium salt, sodium alginate, Suwannee River humic acid and bovine serum albumin were calculated as 1.30 × 10 8  M -1  s -1 , 1.39 × 10 8  M -1  s -1 , 1.03 × 10 8  M -1  s -1 , and 3.17 × 10 7  M -1  s -1 , respectively. Results of PARAFAC analysis, the ratio of humic and fulvic fluorescence component 2 to terrestrial humic-like fluorescence component 1 (C2/C1), and •OH scavenging factor showed high linearity. A predictive model, which combines with the F-EEM/PARAFAC method, predicted the optimal UV and H 2 O 2 dose to achieve target compound removal.
Competing Interests: Declaration of competing interest The authors declare that they have no known competing financial interests or personal relationships that could have appeared to influence the work reported in this paper.
(Copyright © 2020 Elsevier Ltd. All rights reserved.)
Databáze: MEDLINE
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