Departamento de Ingeniería Geomática e Hidráulica, Universidad de Guanajuato, Av. Juárez 77, Zona Centro, 36000, Guanajuato, Guanajuato, Mexico.
Departamento de Ingeniería Química, Tecnológico Nacional de Mexico-Instituto Tecnológico de Celaya, Av. García Cubas 600, 38010, Celaya, Guanajuato, Mexico.
Chemosphere. 2021 May;271:129804. doi: 10.1016/j.chemosphere.2021.129804. Epub 2021 Feb 3.
This paper deals with the degradation of Acid Violet 19 (AV19) textile dye by the electro-peroxone (E-peroxone) process in a laboratory flow plant using a filter press cell fitted with a 3D gas diffusion electrode (3D GDE) containing a graphite felt positioned on carbon-cloth PTFE as cathode, and a Ti|IrSnSb-oxides plate as anode. HO was formed by the oxygen reduction reaction (ORR) in the cathode; the air was supplied by an external compressor. The O produced externally by an ozonator was added in the pipeline at the outlet of the electrolyzer to promote the reaction between the HO and O to produce OH, which is the responsible for the mineralization of the dye. The effect of electrolyte flow rate (Q), current density (j), and initial concentration of AV19 dye on its degradation was addressed. The best electrolysis in a solution containing 40 mg TOC L, 0.05 M NaSO, at pH 3, was obtained at j = 20 mA cm, Q = 2.0 L min, using a pressure of the air fed to the 3D GDE of P = 3 psi, and an ozone inlet mass flow rate of [Formula: see text] = 14.5 mg L, achieving 100% discoloration, 60% mineralization, with mineralization current efficiency and energy consumption of 36% and 0.085 kWh(gTOC). The degradation of AV19 dye was also performed by anodic oxidation plus HO electrogenerated (AO-HO) and ozonation. The oxidation power was AO-HO < ozonation < E-peroxone. Three carboxylic acids were quantified by chromatography as oxidation end products.
本文研究了在实验室流动装置中使用过滤压力机单元，内置 3D 气体扩散电极（3D GDE），其中包含置于碳纤维布 PTFE 上的石墨毡作为阴极，以及 Ti|IrSnSb-氧化物板作为阳极，通过电过氧（E-peroxone）过程降解酸性紫 19（AV19）纺织染料。HO 通过阴极中的氧气还原反应（ORR）形成；空气由外部压缩机供应。由臭氧发生器外部产生的 O 通过在电解槽出口的管道中添加，以促进 HO 和 O 之间的反应生成 OH，OH 是染料矿化的原因。研究了电解质流速（Q）、电流密度（j）和 AV19 染料初始浓度对其降解的影响。在含有 40mg TOC L、0.05M NaSO 和 pH 3 的溶液中，在 j = 20 mA cm、Q = 2.0 L min、3D GDE 进气压力为 P = 3 psi 和臭氧入口质量流速为 [Formula: see text] = 14.5mg L 的最佳条件下进行电解，实现了 100%脱色，60%矿化，矿化电流效率和能耗分别为 36%和 0.085 kWh（gTOC）。通过阳极氧化加 HO 电生成（AO-HO）和臭氧氧化也对 AV19 染料进行了降解。氧化能力为 AO-HO < 臭氧氧化 < E-peroxone。通过色谱法定量了三种羧酸作为氧化终产物。
