Among the large family of emergent pharmaceutical contaminants, we find acetaminophen (ACE) that critically needs to be removed from wastewater. Advanced Oxidation Process (AOP) have proven effective in the degradation of large molecular contaminants from water. To the best of our knowledge this is the first study reported on the degradation of ACE based on immobilized TiO 2 thin films. In an effort to increase the understanding of the efficiency of the degradation process, an in-depth investigation of the effects of the structure, i.e., coating layers and the amount of surface, i.e., number of coated slides used, is needed. Transparent, anatase-form TiO 2 thin films were prepared via the sol-gel method (Rawal, S., S. Buer, J. R. Sanders, and P. E. Arce. 2021. “Photocatalytic Degradation of Acetaminophen from Water Solutions Via Thin Films. Part I: Synthesis and Characterization of TiO 2 Thin Films.” International Journal of Reactor Engineering [Accepted]) and deposited onto glass microscope slides using a novel spraying technique, with coatings ranging from one to 10 layers. This contribution summarizes the effect of several key factors including initial concentration of the ACE, the number of coating layers (6, 8, and 10) on the glass slides and the number (4 and 6) of slides on the degradation levels for three selected media, e.g., acid, neutral and base. Comparisons studies, supported by statistical analysis between two different sets (4 and 6) of slides with discussion of potential physical-chemical reasons behind the behaviors are reported. Finally, global, first order kinetic rate constants are also reported for the different conditions used in the investigation. Although further research would be needed, in general the results are promising for the potential degradation of ACE in continuous flow systems by using immobilized TiO 2 on surfaces as thin films.

中文翻译：

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紫外光和二氧化钛薄膜光催化降解水中对乙酰氨基酚第二部分：化学和动力学方面

在一大类新出现的药物污染物中，我们发现了迫切需要从废水中去除的对乙酰氨基酚 (ACE)。高级氧化工艺 (AOP) 已被证明可有效降解水中的大分子污染物。据我们所知，这是第一项关于基于固定化 TiO 2 薄膜降解 ACE 的研究。为了增加对降解过程效率的理解，需要深入研究结构的影响，即涂层和表面量，即使用的涂层载玻片数量。通过溶胶-凝胶法制备透明的锐钛矿型 TiO 2 薄膜（Rawal, S., S. Buer, JR Sanders, and PE Arce. 2021. “Photocatalytic Degradation of Acetaminophen from Water Solutions Via Thin Films. Part I ：TiO 2 薄膜的合成和表征。” International Journal of Reactor Engineering [已接受]）并使用一种新型喷涂技术沉积在玻璃显微镜载玻片上，涂层从一层到 10 层不等。该贡献总结了几个关键因素的影响，包括 ACE 的初始浓度、载玻片上涂层的数量（6、8 和 10）以及载玻片的数量（4 和 6）对三个选定的降解水平的影响介质，例如酸、中性和碱。报告了由两组不同（4 和 6）载玻片之间的统计分析支持的比较研究，并讨论了行为背后的潜在物理化学原因。最后，还报告了研究中使用的不同条件的全局一级动力学速率常数。