过硫酸盐
矿化(土壤科学)
化学
电解质
电流密度
流出物
水溶液
活化能
电极
分析化学(期刊)
核化学
无机化学
催化作用
环境工程
环境化学
环境科学
有机化学
物理
物理化学
量子力学
氮气
作者
Jefferson E. Silveira,Tais O. Cardoso,Márcio Barreto-Rodrigues,Juan A. Zazo,José A. Casas
标识
DOI:10.1080/09593330.2017.1323960
摘要
This work assesses the role of the operational conditions upon the electro-activation of persulfate (PS) using sacrificed iron electrode as a continuous low-cost Fe2+ source. An aqueous phenol solution (100 mg L−1) was selected as model effluent. The studied variables include current density (1–10 mA cm−2), persulfate concentration (0.7–2.85 g L−1), temperature (30–90°C) and the solution conductivity (2.7–20.7 mS cm−1) using Na2SO4 and NaCl as supporting electrolyte. A mineralization degree of around 80% with Na2SO4 and 92% in presence of NaCl was achieved at 30°C using 2.15 g L−1 PS at the lowest current density tested (1 mA cm−2). Besides PS concentration, temperature was the main variable affecting the process. In the range of 30–70°C, it showed a positive effect, achieving TOC conversion above 95% (using Na2SO4 under the previous conditions) along with a significant increase in iron sludge, which adversely affects the economy of the process. A lumped and simplified kinetic model based on persulfate consumption and TOC mineralization is suggested. The activation energy obtained for the TOC decay was 29 kJ mol−1. An estimated operating cost of US$ 3.00 per m3 was obtained, demonstrating the economic feasibility of this process.
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