UV-LED/P25-based photocatalysis for effective degradation of isothiazolone biocide

doi:10.1007/s11783-020-1379-x

Front. Environ. Sci. Eng.

2021, Vol. 15

Issue (5) : 85 https://doi.org/10.1007/s11783-020-1379-x

RESEARCH ARTICLE

UV-LED/P25-based photocatalysis for effective degradation of isothiazolone biocide

Xinzheng Li¹, Zhiming Li¹, Zhihui Xing¹, Zhimin Song¹, Bei Ye², Zhengming Wang³(

), Qianyuan Wu¹(

)

¹. Key Laboratory of Microorganism Application and Risk Control of Shenzhen, Guangdong Provincial Engineering Research Center for Urban Water Recycling and Environmental Safety, International Graduate School at Shenzhen, Tsinghua University, Shenzhen 518055, China
². China Shenzhen Environmental Science and New Energy Technology Engineering Laboratory, Tsinghua-Berkeley Shenzhen Institute, Shenzhen 518055, China
³. Environmental Management Research Institute, National Institute of Advanced Industrial Science and Technology, 16-1 Onogawa, Tsukuba, Ibaraki, 305-8569, Japan

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Abstract

• UV-LED with shorter wavelength was beneficial for photocatalytic degradation.

• SRNOM dramatically inhibit the degradation.

• ·OH acts as the active radical in photocatalytic degradation.

• Degradation mainly undergoes oxidation, hydrolysis and chain growth reactions.

In this work, LED-based photocatalysis using mixed rutile and anatase phase TiO₂ (P25) as the photocatalyst could effectively remove 5-chloro-2-methyl-4-isothiazolin-3-one (CMIT) and methylisothiazolone (MIT) simultaneously, with removal efficiencies above 80% within 20 min. The photocatalytic degradation of both CMIT and MIT could be modeled using a pseudo-first-order rate equation. The photocatalytic degradation rates of CMIT and MIT under LED280 illumination were higher than under LED310 or LED360 illumination. At concentrations below 100 mg/L, the degradation rate of CMIT and MIT under LED illumination significantly increased with increasing catalyst dosage. Additionally, the effects of the chloride ion concentration, alkalinity and dissolved organic matter on the photocatalytic degradation reaction were also investigated. The ·OH free radicals were determined to play the primary role in the photocatalytic degradation reaction, with a degradation contribution of >95%. The photocatalytic degradation of CMIT and MIT mainly occurred via oxidation, hydrolysis, and chain growth reactions. Finally, the possible photocatalytic degradation pathways of CMIT and MIT over LED/P25 are proposed.

Keywords Degradation Photocatalytic LED CMIT P25

Corresponding Author(s): Zhengming Wang,Qianyuan Wu

Issue Date: 17 December 2020

Cite this article:

Xinzheng Li,Zhiming Li,Zhihui Xing, et al. UV-LED/P25-based photocatalysis for effective degradation of isothiazolone biocide[J]. Front. Environ. Sci. Eng., 2021, 15(5): 85.

URL:

https://academic.hep.com.cn/fese/EN/10.1007/s11783-020-1379-x
https://academic.hep.com.cn/fese/EN/Y2021/V15/I5/85

Fig.1 Degradation of (a, c) CMIT and (b, d) MIT by photolysis (LED alone) and UV-LED photocatalysis over P25. Initial CMIT and MIT concentration were 1 mg/L and 0.33 mg/L respectively, P25 dosage= 200 mg/L, and pH= 7.

Fig.2 Light dose-based first-order kinetics rate constant of CMIT (a) and MIT (b) in photocatalytic degradation over P25 of different dosage under illuminations of LED280, LED310, and LED360. Initial CMIT and MIT concentration were 1 mg/L and 0.33 mg/L respectively, and pH= 7.

Fig.3 Light dose-based first-order kinetics rate constant of CMIT (a) and MIT (b) over P25 at different pH values. Initial CMIT and MIT concentration were 1 mg/L and 0.33 mg/L respectively, P25 dosage= 50 mg/L, and pH= 7.

Fig.4 Light dose-based first-order kinetics rate constant of CMIT (a) and MIT (b) in photocatalytic degradation over P25 under illuminations of LED280, LED310, and LED360 at different chloride ion concentrations. Initial CMIT and MIT concentration were 1 mg/L and 0.33 mg/L respectively, P25 dosage= 50 mg/L, and pH= 7.

Fig.5 Light dose-based first-order kinetics rate constant of CMIT (a) and MIT (b) in photocatalytic degradation over P25 under illuminations of LED280, LED310, and LED360 at different alkalinity, initial CMIT and MIT concentration were 1 mg/L and 0.33 mg/L respectively, P25 dosage= 50 mg/L, and pH= 7.

Fig.6 Light dose-based first-order kinetics rate constant of CMIT (a) and MIT (b) in photocatalytic degradation over P25 under illuminations of LED280, LED310, and LED360 at different NOM concentrations. Initial CMIT and MIT concentration were 1 mg/L and 0.33 mg/L respectively, P25 dosage= 50 mg/L, and pH= 7.

Tab.1 Inhibition ratio (a) of tBA toward photodegradation of CMIT and MIT at different pH values

Tab.2 Possible intermediate structures during photodegradation of CMIT as identified by LC-QTOF-MS

Tab.3 Possible intermediate structures during photodegradation of MIT as identified by LC-QTOF-MS

Fig.7 The change in MASS response intensity of degraded species during photocatalysis of CMIT (a,b,c) and MIT (d,e,f) under illuminations of LED280 (a, d), LED310 (b, e), and LED360 (c, f).

Fig.8 Possible degradation pathways of CMIT (a) and MIT (b) during the UV-LED/P25 photocatalysis.

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