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.

在这项工作中，使用混合金红石和锐钛矿相TiO ₂的基于LED的光催化（P25）作为光催化剂可以同时有效地去除5-氯-2-甲基-4-异噻唑啉-3-酮（CMIT）和甲基异噻唑酮（MIT），在20分钟内去除率达到80％以上。CMIT和MIT的光催化降解可以使用伪一级速率方程建模。在LED280照明下，CMIT和MIT的光催化降解速率高于在LED310或LED360照明下。在浓度低于100 mg / L时，随着催化剂用量的增加，LED照明下CMIT和MIT的降解速率显着增加。此外，还研究了氯离子浓度，碱度和溶解的有机物对光催化降解反应的影响。确定·OH自由基在光催化降解反应中起主要作用，降解贡献> 95％。CMIT和MIT的光催化降解主要通过氧化，水解和链增长反应发生。最后，提出了CMIT和MIT在LED / P25上可能的光催化降解途径。