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

作　　者：Xinzheng Li Zhiming Li Zhihui Xing Zhimin Song Bei Ye Zhengming Wang Qianyuan Wu 

机构地区：[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

出　　处：《Frontiers of Environmental Science & Engineering》2021年第5期97-108,共12页环境科学与工程前沿（英文）

基　　金：the Major Science and Technology Program for Water Pollution Control and Treatment,China(No.2017ZX07205001);the Shenzhen Science and Technology Innovation Commission(No.JCYJ20160125095838752);the Development and Reform Commission of Shenzhen Municipality(Urban Water Recycling and EnvironmentSafety Program).

摘　　要：In this work,LED-based photocatalysis using mixed rutile and anatase phase TiO_(2)(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.

关 键 词：DEGRADATION PHOTOCATALYTIC LED CMIT P25 

分 类 号：O64[理学—物理化学]