ABSTRACT

In this study, acetaminophen (ACT) in aqueous solution was treated with electrooxidation and photo-electrooxidation processes (PEO). An electrochemical cell was used for the treatment of different concentrations of ACT (10, 50 and 80 mg L⁻¹). A 2³ factorial design was proposed, and the variables studied were current intensity 0.5 A (45.45 mA cm⁻²) and 1.0 A (90.91 mA cm⁻²), electrode configuration (anode:BDD, cathode:Fe or Cu) and presence/absence of UV light; NaCl 0.043 M (2.5 g L⁻¹) was used as supporting electrolyte, the initial pH was 5.5, and the treatment time was 3 h. The aqueous solutions were characterized before and after the treatment using infrared spectroscopy (FT-IR), Ultraviolet-visible spectroscopy (UV-Vis), chemical oxygen demand (COD), total organic carbon (TOC), total carbon (TC), and fluorescence spectroscopy. The optimal operating conditions using an initial ACT concentration of 80 mg L⁻¹ were 1.0 A, BDD-Fe configuration and UV light (254 nm). The removal efficiencies were 100% of ACT and 82.75% of TOC after 15 min of treatment. At concentrations of 50 and 10 mg L⁻¹, 77.16% and 50.29% of TOC were removed after 10 and 5 min of treatment, respectively. Finally, the kinetic study showed an increase in the rate constants when the UV light was applied.

摘要

在这项研究中，水溶液中的对乙酰氨基酚 (ACT) 通过电氧化和光电氧化过程 (PEO) 进行了处理。电化学电池用于处理不同浓度的 ACT（10、50 和 80 mg L ^-1）。提出了2 ³析因设计，研究的变量是电流强度 0.5 A (45.45 mA cm ^-2 ) 和 1.0 A (90.91 mA cm ^-2 )、电极配置（阳极：BDD，阴极：Fe 或 Cu）和存在/没有紫外线；氯化钠 0.043 M (2.5 g L ^-1)作为支持电解质，初始pH为5.5，处理时间为3 h。使用红外光谱 (FT-IR)、紫外-可见光谱 (UV-Vis)、化学需氧量 (COD)、总有机碳 (TOC)、总碳 (TC) 和荧光光谱。^{使用 80 mg L -1}初始 ACT 浓度的最佳操作条件为 1.0 A、BDD-Fe 配置和紫外光 (254 nm)。处理 15 分钟后，去除效率为 ACT 的 100% 和 TOC 的 82.75%。浓度为 50 和 10 mg L ⁻¹处理 10 分钟和 5 分钟后，分别去除了 77.16% 和 50.29% 的 TOC。最后，动力学研究表明，当施加紫外线时，速率常数会增加。